2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2006-06-26 00:27:37 -07:00
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2008-10-13 11:55:12 +11:00
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2005-06-21 17:17:14 -07:00
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2008-10-15 09:09:21 +11:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:42 -07:00
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2008-05-23 13:04:38 -07:00
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2006-06-26 00:27:42 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-10 00:26:54 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:21:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:21:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:18 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:18 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:18 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2006-01-06 00:20:43 -08:00
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|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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|
|
|
2006-03-27 01:18:10 -08:00
|
|
|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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|
2006-03-27 01:18:10 -08:00
|
|
|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2006-05-30 21:27:13 -07:00
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2006-06-26 00:28:01 -07:00
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2006-05-30 21:27:13 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:58 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2007-09-27 12:47:43 +02:00
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2005-04-16 15:20:36 -07:00
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md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
|
|
|
|
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|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:32 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2005-06-21 17:17:12 -07:00
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2005-06-21 17:17:26 -07:00
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2008-06-05 22:45:53 -07:00
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2007-05-09 02:35:38 -07:00
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2008-06-28 08:31:24 +10:00
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2008-02-06 01:39:52 -08:00
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2008-04-30 00:52:29 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2005-08-22 13:11:08 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:43 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2006-01-06 00:20:36 -08:00
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2006-01-06 00:20:51 -08:00
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2006-01-06 00:20:36 -08:00
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2006-01-06 00:20:51 -08:00
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2006-01-06 00:20:36 -08:00
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2008-07-11 22:02:23 +10:00
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2005-07-27 11:46:09 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:20 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:31 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2007-09-27 12:47:43 +02:00
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2005-06-21 17:17:28 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
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2006-10-03 01:16:03 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2006-10-03 01:16:03 -07:00
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2005-06-21 17:17:28 -07:00
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|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-27 22:29:34 -07:00
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2005-06-21 17:17:28 -07:00
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2007-09-27 12:47:43 +02:00
|
|
|
|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2007-09-27 12:47:43 +02:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
|
|
|
|
|
|
|
|
|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
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|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:28 -07:00
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2007-09-27 12:47:43 +02:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:27 -07:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:23:54 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:34 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:20 +10:00
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2005-04-16 15:20:36 -07:00
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2008-03-23 15:10:33 +01:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:20 +10:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:30 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:37 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:37 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:37 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:37 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:11 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:37 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:36 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-28 02:15:49 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-28 02:15:49 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:55 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:25 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:56 -07:00
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2005-08-18 11:24:16 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:11 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:27 -07:00
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2007-05-09 02:35:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:27 -07:00
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2005-06-21 17:17:25 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:25 -07:00
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2006-06-26 00:27:56 -07:00
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2005-06-21 17:17:25 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2006-06-26 00:27:41 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:25 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:35 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:24:02 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:11 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:27 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:24 -08:00
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2005-11-08 21:39:31 -08:00
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2005-11-08 21:39:24 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:24 -08:00
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2005-11-08 21:39:35 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:03 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:03 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-11 22:02:23 +10:00
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2008-07-21 14:42:12 +10:00
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2008-07-11 22:02:23 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2005-04-16 15:20:36 -07:00
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2006-10-21 10:24:08 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-21 10:24:08 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-21 10:24:08 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-21 10:24:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-09-09 16:23:51 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:36 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:52 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:53 -07:00
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2005-09-09 16:23:59 -07:00
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2005-09-09 16:23:53 -07:00
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2008-03-04 14:29:31 -08:00
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2008-07-11 22:02:23 +10:00
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2008-03-04 14:29:31 -08:00
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2005-09-09 16:23:53 -07:00
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2006-07-10 04:44:14 -07:00
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2008-04-28 02:15:49 -07:00
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2006-02-03 03:03:41 -08:00
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2008-04-28 02:15:49 -07:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:03:41 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-04 14:29:31 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:55 -08:00
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2006-10-21 10:24:08 -07:00
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2006-01-06 00:20:55 -08:00
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2006-02-03 03:03:41 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:25 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:56 -07:00
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2005-08-18 11:24:16 -07:00
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2006-02-03 03:03:41 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:27 -07:00
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2005-09-09 16:23:51 -07:00
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2007-05-09 02:35:36 -07:00
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2005-06-21 17:17:27 -07:00
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2007-05-09 02:35:36 -07:00
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2006-03-27 01:18:11 -08:00
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2005-06-21 17:17:25 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:25 -07:00
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2006-06-26 00:27:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:25 -07:00
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2005-11-08 21:39:31 -08:00
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2005-06-21 17:17:25 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-21 10:24:08 -07:00
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2006-01-06 00:20:52 -08:00
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2006-02-02 14:28:04 -08:00
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2006-02-03 03:03:41 -08:00
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2006-02-02 14:28:04 -08:00
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2005-06-21 17:17:27 -07:00
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2005-09-09 16:23:51 -07:00
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2005-06-21 17:17:27 -07:00
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2006-06-26 00:27:40 -07:00
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2006-03-27 01:18:11 -08:00
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2005-06-21 17:17:27 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2007-05-23 13:58:10 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-11 22:02:23 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-11 22:02:23 +10:00
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2008-07-21 14:42:12 +10:00
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2008-07-11 22:02:23 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-07-11 22:02:23 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-11 22:02:23 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:46 +10:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:46 +10:00
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2005-04-16 15:20:36 -07:00
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2007-02-28 20:11:35 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2007-02-28 20:11:35 -08:00
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2008-07-21 17:05:25 +10:00
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2007-02-28 20:11:35 -08:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2007-02-28 20:11:35 -08:00
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2005-11-08 21:39:37 -08:00
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2006-01-12 01:05:23 -08:00
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2007-03-26 21:32:14 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:32 -07:00
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2006-01-06 00:20:55 -08:00
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2007-05-23 13:58:10 -07:00
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2006-01-06 00:20:55 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:35 -08:00
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2007-12-17 23:05:35 -07:00
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2006-01-12 01:05:23 -08:00
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2007-12-17 23:05:35 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:35 -08:00
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2005-11-08 21:39:24 -08:00
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2007-12-17 23:05:35 -07:00
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2007-03-26 21:32:14 -08:00
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2005-11-08 21:39:24 -08:00
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2008-08-25 19:56:12 +09:00
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2007-03-26 21:32:14 -08:00
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2008-10-21 13:25:28 +11:00
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2008-07-21 17:05:25 +10:00
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2008-02-06 01:39:54 -08:00
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2009-01-09 08:31:11 +11:00
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2005-04-16 15:20:36 -07:00
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2007-03-26 21:32:14 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:56 -08:00
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2007-04-04 19:08:18 -07:00
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2008-02-06 01:39:56 -08:00
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2007-04-04 19:08:18 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:17:58 -08:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:24 -08:00
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2008-10-21 13:25:28 +11:00
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2007-04-04 19:08:18 -07:00
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2008-07-21 17:05:25 +10:00
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2007-04-04 19:08:18 -07:00
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2008-07-21 17:05:25 +10:00
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2008-02-06 01:39:56 -08:00
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2007-04-04 19:08:18 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:36:13 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 20:40:24 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 20:40:24 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-04 14:29:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:24 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:59 -08:00
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2005-04-16 15:20:36 -07:00
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md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
|
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|
|
md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:42 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:58 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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md: need another print_sb for mdp_superblock_1
md_print_devices is called in two code path: MD_BUG(...), and md_ioctl
with PRINT_RAID_DEBUG. it will dump out all in use md devices
information;
However, it wrongly processed two types of superblock in one:
The header file <linux/raid/md_p.h> has defined two types of superblock,
struct mdp_superblock_s (typedefed with mdp_super_t) according to md with
metadata 0.90, and struct mdp_superblock_1 according to md with metadata
1.0 and later,
These two types of superblock are very different,
The md_print_devices code processed them both in mdp_super_t, that would
lead to wrong informaton dump like:
[ 6742.345877]
[ 6742.345887] md: **********************************
[ 6742.345890] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 6742.345892] md: **********************************
[ 6742.345896] md1: <ram7><ram6><ram5><ram4>
[ 6742.345907] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 6742.345909] md: rdev superblock:
[ 6742.345914] md: SB: (V:0.90.0) ID:<42ef13c7.598c059a.5f9f1645.801e9ee6> CT:4919856d
[ 6742.345918] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 6742.345922] md: UT:4919856d ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:b7992907 E:00000001
[ 6742.345924] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 6742.345930] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 6742.345933] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 6742.345937] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 6742.345942] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 6742.346058] md0: <ram3><ram2><ram1><ram0>
[ 6742.346067] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 6742.346070] md: rdev superblock:
[ 6742.346073] md: SB: (V:1.0.0) ID:<369aad81.00000000.00000000.00000000> CT:9a322a9c
[ 6742.346077] md: L-1507699579 S976570180 ND:48 RD:0 md0 LO:65536 CS:196610
[ 6742.346081] md: UT:00000018 ST:0 AD:131048 WD:0 FD:8 SD:0 CSUM:00000000 E:00000000
[ 6742.346084] D 0: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346089] D 1: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346092] D 2: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346096] D 3: DISK<N:-1,(-1,-1),R:-1,S:-1>
[ 6742.346102] md: THIS: DISK<N:0,(0,0),R:0,S:0>
...
[ 6742.346219] md: **********************************
[ 6742.346221]
Here md1 is metadata 0.90.0, and md0 is metadata 1.2
After some more code to distinguish these two types of superblock, in this patch,
it will generate dump information like:
[ 7906.755790]
[ 7906.755799] md: **********************************
[ 7906.755802] md: * <COMPLETE RAID STATE PRINTOUT> *
[ 7906.755804] md: **********************************
[ 7906.755808] md1: <ram7><ram6><ram5><ram4>
[ 7906.755819] md: rdev ram7, SZ:00065472 F:0 S:1 DN:3
[ 7906.755821] md: rdev superblock (MJ:0):
[ 7906.755826] md: SB: (V:0.90.0) ID:<3fca7a0d.a612bfed.5f9f1645.801e9ee6> CT:491989f3
[ 7906.755830] md: L5 S00065472 ND:4 RD:4 md1 LO:2 CS:65536
[ 7906.755834] md: UT:491989f3 ST:1 AD:4 WD:4 FD:0 SD:0 CSUM:00fb52ad E:00000001
[ 7906.755836] D 0: DISK<N:0,(1,8),R:0,S:6>
[ 7906.755842] D 1: DISK<N:1,(1,10),R:1,S:6>
[ 7906.755845] D 2: DISK<N:2,(1,12),R:2,S:6>
[ 7906.755849] D 3: DISK<N:3,(1,14),R:3,S:6>
[ 7906.755855] md: THIS: DISK<N:3,(1,14),R:3,S:6>
...
[ 7906.755972] md0: <ram3><ram2><ram1><ram0>
[ 7906.755981] md: rdev ram3, SZ:00065472 F:0 S:1 DN:3
[ 7906.755984] md: rdev superblock (MJ:1):
[ 7906.755989] md: SB: (V:1) (F:0) Array-ID:<5fbcf158:55aa:5fbe:9a79:1e939880dcbd>
[ 7906.755990] md: Name: "DG5:0" CT:1226410480
[ 7906.755998] md: L5 SZ130944 RD:4 LO:2 CS:128 DO:24 DS:131048 SO:8 RO:0
[ 7906.755999] md: Dev:00000003 UUID: 9194d744:87f7:a448:85f2:7497b84ce30a
[ 7906.756001] md: (F:0) UT:1226410480 Events:0 ResyncOffset:-1 CSUM:0dbcd829
[ 7906.756003] md: (MaxDev:384)
...
[ 7906.756113] md: **********************************
[ 7906.756116]
this md0 (metadata 1.2) information dumping is exactly according to struct
mdp_superblock_1.
Signed-off-by: Cheng Renquan <crquan@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Dan Williams <dan.j.williams@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:12 -07:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:28 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2006-08-27 01:23:49 -07:00
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2006-10-03 01:15:46 -07:00
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2006-08-27 01:23:49 -07:00
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2006-10-03 01:15:46 -07:00
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2006-08-27 01:23:49 -07:00
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2005-06-21 17:17:12 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:57 -07:00
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2006-10-03 01:15:46 -07:00
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2006-06-26 00:27:57 -07:00
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2007-01-26 00:57:02 -08:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:12 -07:00
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2008-02-06 01:39:51 -08:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:26 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:12 -07:00
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2008-02-06 01:39:51 -08:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:06:13 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:57 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-06-21 17:17:28 -07:00
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2008-07-11 22:02:23 +10:00
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2005-06-21 17:17:28 -07:00
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2008-07-11 22:02:23 +10:00
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2006-06-26 00:27:57 -07:00
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2005-06-21 17:17:28 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:28 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
|
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2006-10-03 01:15:46 -07:00
|
|
|
|
2005-06-21 17:17:28 -07:00
|
|
|
|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
|
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2006-10-03 01:15:46 -07:00
|
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|
|
|
|
2005-06-21 17:17:12 -07:00
|
|
|
|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
|
|
|
|
2005-06-21 17:17:12 -07:00
|
|
|
|
|
|
|
|
|
2006-10-03 01:15:46 -07:00
|
|
|
|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
|
|
|
|
2005-06-21 17:17:26 -07:00
|
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|
2005-06-21 17:17:12 -07:00
|
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2005-04-16 15:20:36 -07:00
|
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|
|
|
2008-03-23 18:34:54 +01:00
|
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|
2006-01-06 00:20:41 -08:00
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2005-11-08 21:39:24 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:24 -08:00
|
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|
2008-02-06 01:39:57 -08:00
|
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|
2005-11-08 21:39:24 -08:00
|
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|
2005-11-08 21:39:31 -08:00
|
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2005-11-08 21:39:24 -08:00
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2005-11-08 21:39:31 -08:00
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2005-11-08 21:39:24 -08:00
|
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2006-06-26 00:28:01 -07:00
|
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|
2008-04-30 00:52:32 -07:00
|
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2005-11-08 21:39:31 -08:00
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|
2005-11-08 21:39:24 -08:00
|
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2006-06-26 00:27:58 -07:00
|
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2006-06-26 00:28:01 -07:00
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2008-04-30 00:52:32 -07:00
|
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2006-06-26 00:27:58 -07:00
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2006-12-22 01:11:41 -08:00
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2006-06-26 00:27:58 -07:00
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2006-06-26 00:28:01 -07:00
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2008-04-30 00:52:32 -07:00
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2006-06-26 00:28:01 -07:00
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|
2006-06-26 00:27:58 -07:00
|
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|
2008-10-21 13:25:28 +11:00
|
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|
2006-06-26 00:27:58 -07:00
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2006-07-10 04:44:18 -07:00
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2005-11-08 21:39:24 -08:00
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2006-01-06 00:20:52 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:52 -08:00
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2006-01-06 00:20:55 -08:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:55 -08:00
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2008-06-28 08:31:31 +10:00
|
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2008-02-06 01:39:51 -08:00
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2008-06-28 08:31:31 +10:00
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2009-01-09 08:31:08 +11:00
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2008-06-28 08:31:31 +10:00
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2008-06-28 08:31:33 +10:00
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2008-06-28 08:31:31 +10:00
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2008-06-28 08:31:44 +10:00
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2008-10-21 13:25:28 +11:00
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2008-06-28 08:31:31 +10:00
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2008-02-06 01:39:51 -08:00
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2008-02-06 01:39:54 -08:00
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2008-02-06 01:39:51 -08:00
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2008-10-21 13:25:28 +11:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:55 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:55 -08:00
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2006-01-06 00:20:56 -08:00
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2006-01-06 00:20:59 -08:00
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2006-01-06 00:20:56 -08:00
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2008-06-28 08:31:29 +10:00
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2006-01-06 00:20:56 -08:00
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2008-02-06 01:39:54 -08:00
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2006-01-06 00:20:56 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:56 -08:00
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2006-01-06 00:21:06 -08:00
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2008-02-06 01:39:54 -08:00
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2006-01-06 00:21:06 -08:00
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2008-07-12 10:37:50 +10:00
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2008-02-06 01:39:54 -08:00
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2008-03-04 14:29:33 -08:00
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2008-07-12 10:37:50 +10:00
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2008-06-28 08:31:46 +10:00
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2008-07-12 10:37:50 +10:00
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2008-07-21 14:42:12 +10:00
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2008-06-28 08:31:46 +10:00
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2008-10-13 11:55:11 +11:00
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2008-06-28 08:31:46 +10:00
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2006-01-06 00:21:06 -08:00
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2008-07-12 10:37:50 +10:00
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2008-02-06 01:39:54 -08:00
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2009-01-09 08:31:08 +11:00
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2008-02-06 01:39:54 -08:00
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2008-03-04 14:29:33 -08:00
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2008-02-06 01:39:58 -08:00
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2008-02-06 01:39:54 -08:00
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2009-01-09 08:31:08 +11:00
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2008-02-06 01:39:54 -08:00
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2008-07-21 14:42:07 +10:00
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2008-02-06 01:39:54 -08:00
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2008-03-04 14:29:33 -08:00
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2008-02-06 01:39:54 -08:00
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2006-01-06 00:21:06 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:21:06 -08:00
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2005-11-08 21:39:24 -08:00
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2006-01-06 00:20:52 -08:00
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2006-01-06 00:20:55 -08:00
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2006-01-06 00:20:56 -08:00
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2006-01-06 00:21:06 -08:00
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2005-11-08 21:39:24 -08:00
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2008-03-04 14:29:33 -08:00
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2005-11-08 21:39:24 -08:00
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2008-03-04 14:29:33 -08:00
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2005-11-08 21:39:24 -08:00
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2008-03-04 14:29:33 -08:00
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2005-11-08 21:39:24 -08:00
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2006-07-10 04:44:19 -07:00
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2008-03-04 14:29:33 -08:00
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2008-02-06 01:39:55 -08:00
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2008-03-04 14:29:33 -08:00
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2008-04-30 00:52:28 -07:00
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2008-02-06 01:39:55 -08:00
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2005-11-08 21:39:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:54 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-17 23:05:35 -07:00
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2005-11-08 21:39:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-28 10:38:30 -07:00
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2006-12-22 01:11:41 -08:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2006-01-06 00:20:52 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:06:11 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:32 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:32 -07:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:26:42 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:59 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:59 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2007-05-23 13:58:10 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-05 15:54:13 +10:00
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2006-06-26 00:27:37 -07:00
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2008-09-24 22:48:19 -07:00
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2006-06-26 00:27:37 -07:00
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2008-09-24 22:48:19 -07:00
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2006-06-26 00:27:37 -07:00
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2008-09-24 22:48:19 -07:00
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2006-06-26 00:27:37 -07:00
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2008-08-05 15:54:13 +10:00
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2006-06-26 00:27:37 -07:00
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2008-08-05 15:54:13 +10:00
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2006-06-26 00:27:37 -07:00
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2006-07-10 04:44:18 -07:00
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2006-06-26 00:27:37 -07:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:36 -08:00
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2006-01-06 00:20:51 -08:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:51 -08:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:51 -08:00
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2008-02-06 01:39:57 -08:00
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2006-01-06 00:20:51 -08:00
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2006-07-10 04:44:18 -07:00
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2005-11-08 21:39:23 -08:00
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2006-06-26 00:27:59 -07:00
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2007-05-09 02:35:38 -07:00
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2006-06-26 00:27:59 -07:00
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2007-05-09 02:35:38 -07:00
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2006-06-26 00:27:59 -07:00
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2006-07-10 04:44:18 -07:00
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2006-06-26 00:27:59 -07:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:45 -08:00
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2007-05-09 02:35:38 -07:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:54 -08:00
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2007-05-09 02:35:38 -07:00
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2006-01-06 00:20:54 -08:00
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2006-07-10 04:44:18 -07:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:47 -08:00
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2007-05-09 02:35:38 -07:00
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2006-01-06 00:20:47 -08:00
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2007-05-09 02:35:38 -07:00
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2006-01-06 00:20:47 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:47 -08:00
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2006-06-26 00:28:00 -07:00
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2006-07-10 04:44:18 -07:00
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2006-06-26 00:28:00 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-03-25 21:00:53 +01:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2006-06-26 00:28:01 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-02-06 01:39:51 -08:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-11 22:02:22 +10:00
|
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|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-21 17:05:25 +10:00
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2008-02-06 01:39:51 -08:00
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2008-07-11 22:02:22 +10:00
|
|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-21 17:05:25 +10:00
|
|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-11 22:02:22 +10:00
|
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2008-02-06 01:39:51 -08:00
|
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|
|
|
|
|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-11 22:02:22 +10:00
|
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|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-04-30 00:52:30 -07:00
|
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|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-10-13 11:55:12 +11:00
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2008-07-11 22:02:22 +10:00
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2008-10-13 11:55:12 +11:00
|
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2008-04-30 00:52:30 -07:00
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|
|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-02-06 01:39:51 -08:00
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2008-04-30 00:52:30 -07:00
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2008-02-06 01:39:51 -08:00
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|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-02-06 01:39:51 -08:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-04-30 00:52:30 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-06-28 08:31:36 +10:00
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2008-10-21 13:25:21 +11:00
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|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
|
|
|
|
2008-06-28 08:31:36 +10:00
|
|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2006-07-10 04:44:18 -07:00
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|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2006-01-06 00:21:16 -08:00
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2008-02-06 01:39:54 -08:00
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2006-01-06 00:21:16 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:47 -08:00
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2006-10-03 01:15:49 -07:00
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2006-01-06 00:20:49 -08:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2008-07-11 22:02:22 +10:00
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2006-10-03 01:15:46 -07:00
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2006-01-06 00:20:49 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:49 -08:00
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2006-01-06 00:20:50 -08:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:50 -08:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:50 -08:00
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2008-10-13 11:55:11 +11:00
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2006-01-06 00:20:50 -08:00
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2008-02-06 01:39:51 -08:00
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2008-02-06 01:39:57 -08:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:50 -08:00
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2006-12-22 01:11:41 -08:00
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2006-01-06 00:20:50 -08:00
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2007-05-09 02:35:34 -07:00
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2006-01-06 00:20:50 -08:00
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2008-02-06 01:39:51 -08:00
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2006-01-06 00:20:50 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:20:50 -08:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:44 -08:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:44 -08:00
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2005-11-08 21:39:29 -08:00
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2007-10-16 23:30:53 -07:00
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2006-03-27 01:18:09 -08:00
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2005-11-08 21:39:26 -08:00
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2008-06-28 08:31:41 +10:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:44 -08:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:44 -08:00
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2006-01-06 00:20:41 -08:00
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2005-11-08 21:39:44 -08:00
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2006-01-06 00:20:46 -08:00
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2005-11-08 21:39:26 -08:00
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2008-06-28 08:31:41 +10:00
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2005-11-08 21:39:44 -08:00
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2008-06-28 08:31:41 +10:00
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2006-03-27 01:18:13 -08:00
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2008-06-28 08:31:43 +10:00
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2006-03-27 01:18:13 -08:00
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2006-01-06 00:20:41 -08:00
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2005-11-08 21:39:44 -08:00
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2006-05-20 14:59:57 -07:00
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2005-11-08 21:39:44 -08:00
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2006-01-06 00:20:46 -08:00
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2005-11-08 21:39:26 -08:00
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2009-01-09 08:31:05 +11:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:26 -08:00
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2006-07-10 04:44:18 -07:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:39 -08:00
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2006-07-10 04:44:18 -07:00
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2005-11-08 21:39:26 -08:00
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2006-01-06 00:21:36 -08:00
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2007-10-16 23:30:54 -07:00
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2006-01-06 00:21:36 -08:00
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2008-05-23 13:04:38 -07:00
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2006-01-06 00:21:36 -08:00
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2008-03-25 22:24:09 +01:00
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2006-01-06 00:21:36 -08:00
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2008-03-25 22:24:09 +01:00
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2006-01-06 00:21:36 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:21:36 -08:00
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2006-07-10 04:44:18 -07:00
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2006-01-06 00:21:36 -08:00
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2008-06-28 08:31:24 +10:00
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2008-02-06 01:39:52 -08:00
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2008-06-28 08:31:24 +10:00
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2008-02-06 01:39:52 -08:00
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2006-03-27 01:18:14 -08:00
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2007-05-09 02:35:38 -07:00
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2006-03-27 01:18:14 -08:00
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2005-11-08 21:39:23 -08:00
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2006-06-26 00:27:59 -07:00
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2005-11-08 21:39:23 -08:00
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2006-01-06 00:20:47 -08:00
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2006-01-06 00:20:49 -08:00
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2006-06-26 00:28:00 -07:00
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2006-01-06 00:20:50 -08:00
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2006-01-06 00:21:16 -08:00
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2006-06-26 00:27:37 -07:00
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|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2007-05-09 02:35:38 -07:00
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2005-11-08 21:39:40 -08:00
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2005-11-08 21:39:26 -08:00
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2005-11-08 21:39:26 -08:00
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2006-01-06 00:21:36 -08:00
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2008-05-23 13:04:38 -07:00
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2006-01-06 00:21:36 -08:00
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2008-06-28 08:31:24 +10:00
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2008-02-06 01:39:52 -08:00
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2006-03-27 01:18:14 -08:00
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2006-10-03 01:15:49 -07:00
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2007-10-16 23:30:54 -07:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:40 -08:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2006-04-20 02:43:23 -07:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2006-07-10 04:44:19 -07:00
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2006-04-20 02:43:23 -07:00
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|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2006-04-20 02:43:23 -07:00
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2005-11-08 21:39:39 -08:00
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2005-11-08 21:39:23 -08:00
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2009-01-09 08:31:09 +11:00
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2005-11-08 21:39:23 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
|
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2009-01-09 08:31:10 +11:00
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2007-12-17 15:54:39 -04:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
|
|
|
|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2009-01-09 08:31:10 +11:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:20 -08:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2005-06-20 21:15:16 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-21 13:25:32 +11:00
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md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
|
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|
2008-10-21 13:25:32 +11:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:05 +09:00
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2008-06-28 08:31:26 +10:00
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2007-12-17 15:54:39 -04:00
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2007-03-26 21:32:14 -08:00
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2008-10-21 13:25:21 +11:00
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2007-12-17 15:54:39 -04:00
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2008-10-21 13:25:21 +11:00
|
|
|
|
|
|
|
|
|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
|
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|
2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:36 +10:00
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2008-10-21 13:25:21 +11:00
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2008-06-28 08:31:36 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:15 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:26:42 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:53 -08:00
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2005-04-16 15:26:42 -07:00
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2008-02-06 01:39:53 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:26:42 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:54 -07:00
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2007-07-17 04:06:12 -07:00
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2008-07-11 22:02:23 +10:00
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2007-07-17 04:06:12 -07:00
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2008-07-11 22:02:23 +10:00
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2007-07-17 04:06:12 -07:00
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2008-07-11 22:02:23 +10:00
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2007-07-17 04:06:12 -07:00
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2008-10-21 13:25:28 +11:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:11 -08:00
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2006-03-27 01:18:13 -08:00
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2006-03-27 01:18:11 -08:00
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2007-02-28 20:11:35 -08:00
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2009-01-09 08:31:08 +11:00
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2007-02-28 20:11:35 -08:00
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2009-01-09 08:31:08 +11:00
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2007-02-28 20:11:35 -08:00
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2005-08-26 18:34:16 -07:00
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2005-04-16 15:20:36 -07:00
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|
[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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|
2006-01-06 00:20:15 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2006-01-06 00:20:16 -08:00
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2008-03-26 00:07:03 +01:00
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2006-01-06 00:20:16 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2007-03-26 21:32:14 -08:00
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2009-01-09 08:31:05 +11:00
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2007-03-26 21:32:14 -08:00
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2005-11-08 21:39:42 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:37 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:24 -08:00
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2009-01-09 08:31:08 +11:00
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2005-11-08 21:39:24 -08:00
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2007-03-26 21:32:14 -08:00
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2005-11-08 21:39:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:22 +10:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2006-07-10 04:44:15 -07:00
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2006-06-26 00:27:40 -07:00
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2009-01-09 08:31:08 +11:00
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2006-06-26 00:27:40 -07:00
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2006-07-10 04:44:15 -07:00
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2006-06-26 00:27:40 -07:00
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2006-07-10 04:44:15 -07:00
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2006-06-26 00:27:40 -07:00
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2007-05-09 18:51:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2008-10-21 13:25:21 +11:00
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2009-01-09 08:31:05 +11:00
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2008-06-28 08:31:43 +10:00
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2008-08-25 19:56:05 +09:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:21 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:21 +10:00
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2008-10-21 13:25:21 +11:00
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2008-07-11 22:02:21 +10:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:47 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2008-07-11 22:02:22 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2008-07-11 22:02:22 +10:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2005-08-04 12:53:35 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-28 20:11:42 -08:00
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2007-03-26 21:32:14 -08:00
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2009-01-09 08:31:05 +11:00
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2005-11-08 21:39:40 -08:00
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2009-01-09 08:31:05 +11:00
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2005-04-16 15:20:36 -07:00
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2008-05-23 13:04:37 -07:00
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2008-10-21 13:25:21 +11:00
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2006-12-10 02:20:44 -08:00
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2007-05-09 18:51:36 -07:00
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2006-12-10 02:20:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2005-11-08 21:39:24 -08:00
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2006-12-10 02:20:44 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-02 14:28:05 -08:00
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2006-06-26 00:27:47 -07:00
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2006-02-02 14:28:05 -08:00
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2009-01-09 08:31:08 +11:00
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2005-11-08 21:39:24 -08:00
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2008-02-06 01:39:56 -08:00
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2007-04-04 19:08:18 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:22 +10:00
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[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2006-06-26 00:28:00 -07:00
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2008-06-28 08:31:24 +10:00
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2008-02-06 01:39:52 -08:00
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2007-05-09 02:35:38 -07:00
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2008-02-06 01:39:51 -08:00
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2008-02-06 01:39:53 -08:00
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2008-04-30 00:52:29 -07:00
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2008-10-28 17:01:23 +11:00
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|
2009-01-09 08:31:10 +11:00
|
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|
|
|
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|
|
|
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and
adds the ability to stop and array without tearing it down.
Array states/settings:
clear
No devices, no size, no level
Equivalent to STOP_ARRAY ioctl
inactive
May have some settings, but array is not active
all IO results in error
When written, doesn't tear down array, but just stops it
suspended (not supported yet)
All IO requests will block. The array can be reconfigured.
Writing this, if accepted, will block until array is quiescent
readonly
no resync can happen. no superblocks get written.
write requests fail
read-auto
like readonly, but behaves like 'clean' on a write request.
clean - no pending writes, but otherwise active.
When written to inactive array, starts without resync
If a write request arrives then
if metadata is known, mark 'dirty' and switch to 'active'.
if not known, block and switch to write-pending
If written to an active array that has pending writes, then fails.
active
fully active: IO and resync can be happening.
When written to inactive array, starts with resync
write-pending (not supported yet)
clean, but writes are blocked waiting for 'active' to be written.
active-idle
like active, but no writes have been seen for a while (100msec).
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 00:27:58 -07:00
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2006-06-26 00:27:39 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2008-10-21 13:25:21 +11:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:20:50 -08:00
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2005-04-16 15:20:36 -07:00
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2005-04-16 15:26:42 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:59 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:07 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:59 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:17 +10:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:53 -08:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:20:50 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:03:40 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 20:36:43 +01:00
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2005-06-21 17:17:14 -07:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2005-06-21 17:17:14 -07:00
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2008-05-23 13:04:34 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:21 +10:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:50 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:25 -07:00
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2005-11-08 21:39:31 -08:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:41 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:44 +10:00
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2008-10-21 13:25:28 +11:00
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2005-06-21 17:17:10 -07:00
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2006-12-10 02:20:52 -08:00
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2008-06-28 08:31:41 +10:00
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2005-06-21 17:17:10 -07:00
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2005-08-22 13:11:08 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:55 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-21 22:42:58 +00:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:23 +10:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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|
2005-04-16 15:20:36 -07:00
|
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|
2006-10-06 00:44:04 -07:00
|
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|
2006-01-06 00:20:55 -08:00
|
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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|
|
|
|
|
|
|
|
|
|
|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
|
|
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|
2005-04-16 15:20:36 -07:00
|
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2005-06-21 17:17:14 -07:00
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|
2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:14 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:14 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:27 -07:00
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2005-09-09 16:23:45 -07:00
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2006-06-26 00:27:43 -07:00
|
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2005-09-09 16:23:45 -07:00
|
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2006-06-26 00:27:43 -07:00
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2005-09-09 16:23:45 -07:00
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2006-06-26 00:27:43 -07:00
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2006-06-26 00:27:47 -07:00
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2005-09-09 16:23:45 -07:00
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2006-06-26 00:27:47 -07:00
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2005-09-09 16:23:45 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 02:35:34 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-22 01:11:41 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-16 22:14:57 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:51 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:51 -08:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-28 13:44:12 -08:00
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2006-03-27 01:18:11 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:11 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2009-01-09 08:31:08 +11:00
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2006-01-06 00:20:49 -08:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2008-07-11 22:02:22 +10:00
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2008-07-11 22:02:23 +10:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2008-08-05 15:54:13 +10:00
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2009-01-09 08:31:08 +11:00
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2006-01-06 00:20:49 -08:00
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2006-10-28 10:38:30 -07:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2006-01-09 15:59:24 -08:00
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2008-07-21 17:05:22 +10:00
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2006-01-09 15:59:24 -08:00
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2006-01-06 00:20:49 -08:00
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2006-01-06 00:20:54 -08:00
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2006-03-27 01:18:13 -08:00
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2006-01-06 00:20:54 -08:00
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2006-03-27 01:18:13 -08:00
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2006-01-06 00:20:54 -08:00
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2006-03-27 01:18:13 -08:00
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2006-01-06 00:20:54 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:03:40 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:03:40 -08:00
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2008-07-11 22:02:22 +10:00
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2006-01-06 00:20:49 -08:00
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2006-01-06 00:20:54 -08:00
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2005-09-09 16:23:45 -07:00
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2006-10-03 01:15:46 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-25 18:57:58 +02:00
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2006-01-08 01:02:50 -08:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2006-12-22 01:11:41 -08:00
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2008-02-06 01:39:55 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-09-09 20:36:43 +01:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-25 19:06:35 +02:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2008-10-21 13:25:21 +11:00
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2008-06-28 08:31:36 +10:00
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|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
|
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md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2005-04-16 15:20:36 -07:00
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md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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2006-12-08 02:36:17 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 23:33:23 +02:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2007-05-09 18:51:36 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-02 10:31:15 -05:00
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2006-01-08 01:02:50 -08:00
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2007-05-09 18:51:36 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2005-10-19 21:23:47 -07:00
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2005-09-09 16:23:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-15 00:09:12 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:43 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:56 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:32 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2005-10-19 21:23:47 -07:00
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2005-09-09 16:23:56 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-18 23:40:40 -07:00
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2005-09-09 16:23:56 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:32 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:14 -07:00
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2006-07-10 04:44:20 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:41 +10:00
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2008-06-28 08:31:44 +10:00
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2005-04-16 15:20:36 -07:00
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2006-05-30 21:27:13 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:04 -08:00
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2006-03-27 01:18:09 -08:00
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2006-10-03 01:15:57 -07:00
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2006-03-27 01:18:04 -08:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:16 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:16 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
|
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|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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2006-04-20 02:43:23 -07:00
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2005-04-16 15:20:36 -07:00
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2006-04-20 02:43:23 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2008-03-10 11:43:47 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:08 +11:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:23:45 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:24:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:22 +10:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:22 +10:00
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2005-04-16 15:20:36 -07:00
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2005-09-09 16:24:00 -07:00
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2008-02-06 01:39:51 -08:00
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2005-09-09 16:24:00 -07:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:41 -08:00
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2008-10-13 11:55:12 +11:00
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2005-11-08 21:39:41 -08:00
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2005-06-21 17:17:14 -07:00
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2005-06-21 17:17:15 -07:00
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2008-02-14 19:38:43 -08:00
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2005-06-21 17:17:14 -07:00
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2005-06-21 17:17:15 -07:00
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2005-06-21 17:17:14 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
|
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|
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|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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|
2007-02-12 00:55:33 -08:00
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2006-10-17 00:09:38 -07:00
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2005-04-16 15:20:36 -07:00
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|
2007-05-09 02:35:35 -07:00
|
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|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
|
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|
|
2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:20:36 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:06:12 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:14 +09:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:06:12 -07:00
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2005-11-18 01:11:01 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-17 04:06:12 -07:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 17:05:25 +10:00
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2005-04-16 15:20:36 -07:00
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md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:12 -07:00
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2005-06-21 17:17:26 -07:00
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2005-06-21 17:17:12 -07:00
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2005-06-21 17:17:26 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:36 +10:00
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2005-06-21 17:17:12 -07:00
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2005-06-21 17:17:26 -07:00
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2005-06-21 17:17:12 -07:00
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|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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|
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2008-03-04 14:29:32 -08:00
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|
2008-06-28 08:31:36 +10:00
|
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|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
|
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|
2005-06-21 17:17:12 -07:00
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2008-04-30 00:52:30 -07:00
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2005-06-21 17:17:12 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:26 -07:00
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2006-10-03 01:15:46 -07:00
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2005-06-21 17:17:26 -07:00
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2008-06-28 08:31:36 +10:00
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2005-06-21 17:17:26 -07:00
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[PATCH] md: support BIO_RW_BARRIER for md/raid1
We can only accept BARRIER requests if all slaves handle
barriers, and that can, of course, change with time....
So we keep track of whether the whole array seems safe for barriers,
and also whether each individual rdev handles barriers.
We initially assumes barriers are OK.
When writing the superblock we try a barrier, and if that fails, we flag
things for no-barriers. This will usually clear the flags fairly quickly.
If writing the superblock finds that BIO_RW_BARRIER is -ENOTSUPP, we need to
resubmit, so introduce function "md_super_wait" which waits for requests to
finish, and retries ENOTSUPP requests without the barrier flag.
When writing the real raid1, write requests which were BIO_RW_BARRIER but
which aresn't supported need to be retried. So raid1d is enhanced to do this,
and when any bio write completes (i.e. no retry needed) we remove it from the
r1bio, so that devices needing retry are easy to find.
We should hardly ever get -ENOTSUPP errors when writing data to the raid.
It should only happen if:
1/ the device used to support BARRIER, but now doesn't. Few devices
change like this, though raid1 can!
or
2/ the array has no persistent superblock, so there was no opportunity to
pre-test for barriers when writing the superblock.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:34 -08:00
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2005-06-21 17:17:12 -07:00
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2008-06-28 08:31:36 +10:00
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2008-10-21 13:25:21 +11:00
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2008-05-23 13:04:36 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:37 -07:00
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2005-04-16 15:20:36 -07:00
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2007-01-26 00:57:11 -08:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2008-06-27 21:44:04 -07:00
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2008-06-28 08:31:27 +10:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2008-10-21 13:25:21 +11:00
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2007-01-26 00:57:11 -08:00
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2008-06-27 21:44:04 -07:00
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2007-01-26 00:57:11 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:10 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2006-06-26 00:27:40 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:43 -08:00
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2005-10-19 21:23:47 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:58 -08:00
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2005-04-16 15:20:36 -07:00
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2008-05-23 13:04:38 -07:00
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2005-04-16 15:20:36 -07:00
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2008-09-19 11:49:54 +10:00
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2005-11-08 21:39:43 -08:00
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2005-10-26 01:58:58 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2008-09-19 11:49:54 +10:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-11-08 21:39:26 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:26 -08:00
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2006-06-26 00:27:40 -07:00
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2008-06-28 08:31:24 +10:00
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2006-06-26 00:27:40 -07:00
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2008-06-28 08:31:24 +10:00
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2006-03-27 01:18:09 -08:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2009-01-09 08:31:08 +11:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:57 -07:00
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2005-09-10 00:26:54 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2008-02-06 01:39:52 -08:00
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2005-06-21 17:17:13 -07:00
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2008-02-06 01:39:52 -08:00
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2005-06-21 17:17:13 -07:00
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md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2006-07-10 04:44:16 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:52 -08:00
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2005-04-16 15:20:36 -07:00
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2007-11-07 14:26:56 -05:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-06 00:21:36 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-18 01:11:01 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:57 -07:00
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2005-04-16 15:20:36 -07:00
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2007-11-07 14:26:56 -05:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:13 -07:00
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2005-04-16 15:20:36 -07:00
|
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|
|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
|
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2006-06-26 00:27:40 -07:00
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2006-10-03 01:15:57 -07:00
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2006-06-26 00:27:40 -07:00
|
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2009-01-09 08:31:08 +11:00
|
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:20:52 -08:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:24 +10:00
|
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2008-02-06 01:39:52 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:52 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:18:10 -08:00
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2005-04-16 15:20:36 -07:00
|
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2007-02-28 20:11:48 -08:00
|
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2009-01-09 08:31:08 +11:00
|
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2007-02-28 20:11:48 -08:00
|
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2008-04-30 00:52:32 -07:00
|
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2007-02-28 20:11:48 -08:00
|
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2009-01-09 08:31:11 +11:00
|
|
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|
2009-01-09 08:31:08 +11:00
|
|
|
|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
|
|
|
|
2008-07-28 23:28:06 -07:00
|
|
|
|
|
|
|
|
|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
|
|
|
|
2007-02-28 20:11:48 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2008-06-28 08:31:33 +10:00
|
|
|
|
|
|
|
|
|
2007-02-28 20:11:48 -08:00
|
|
|
|
|
|
|
|
|
2007-03-26 21:32:14 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
2007-02-28 20:11:48 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
|
|
|
|
2007-02-28 20:11:48 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
md: restart recovery cleanly after device failure.
When we get any IO error during a recovery (rebuilding a spare), we abort
the recovery and restart it.
For RAID6 (and multi-drive RAID1) it may not be best to restart at the
beginning: when multiple failures can be tolerated, the recovery may be
able to continue and re-doing all that has already been done doesn't make
sense.
We already have the infrastructure to record where a recovery is up to
and restart from there, but it is not being used properly.
This is because:
- We sometimes abort with MD_RECOVERY_ERR rather than just MD_RECOVERY_INTR,
which causes the recovery not be be checkpointed.
- We remove spares and then re-added them which loses important state
information.
The distinction between MD_RECOVERY_ERR and MD_RECOVERY_INTR really isn't
needed. If there is an error, the relevant drive will be marked as
Faulty, and that is enough to ensure correct handling of the error. So we
first remove MD_RECOVERY_ERR, changing some of the uses of it to
MD_RECOVERY_INTR.
Then we cause the attempt to remove a non-faulty device from an array to
fail (unless recovery is impossible as the array is too degraded). Then
when remove_and_add_spares attempts to remove the devices on which
recovery can continue, it will fail, they will remain in place, and
recovery will continue on them as desired.
Issue: If we are halfway through rebuilding a spare and another drive
fails, and a new spare is immediately available, do we want to:
1/ complete the current rebuild, then go back and rebuild the new spare or
2/ restart the rebuild from the start and rebuild both devices in
parallel.
Both options can be argued for. The code currently takes option 2 as
a/ this requires least code change
b/ this results in a minimally-degraded array in minimal time.
Cc: "Eivind Sarto" <ivan@kasenna.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23 13:04:39 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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2005-06-21 17:17:16 -07:00
|
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2005-04-16 15:20:36 -07:00
|
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2005-06-21 17:17:11 -07:00
|
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|
2008-04-30 00:52:30 -07:00
|
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2005-06-21 17:17:11 -07:00
|
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2008-08-05 15:54:13 +10:00
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2005-04-16 15:20:36 -07:00
|
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2008-02-06 01:39:51 -08:00
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2005-04-16 15:20:36 -07:00
|
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2005-06-21 17:17:11 -07:00
|
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2008-04-30 00:52:30 -07:00
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2005-06-21 17:17:11 -07:00
|
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:11 -07:00
|
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|
2006-03-27 01:18:20 -08:00
|
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|
2007-02-28 20:11:48 -08:00
|
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2005-06-21 17:17:11 -07:00
|
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2008-08-05 15:54:13 +10:00
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2008-04-30 00:52:30 -07:00
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2008-06-28 08:31:36 +10:00
|
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2008-04-30 00:52:30 -07:00
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2008-06-28 08:31:36 +10:00
|
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2008-04-30 00:52:30 -07:00
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2008-06-28 08:31:36 +10:00
|
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2008-10-21 13:25:21 +11:00
|
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|
2005-06-21 17:17:11 -07:00
|
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2006-10-03 01:15:46 -07:00
|
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2005-06-21 17:17:12 -07:00
|
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|
2009-01-09 08:31:08 +11:00
|
|
|
|
2008-06-28 08:31:44 +10:00
|
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|
2008-10-21 13:25:28 +11:00
|
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2008-06-28 08:31:44 +10:00
|
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2005-06-21 17:17:12 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-07 10:02:47 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:43 +10:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:46 -07:00
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2005-06-21 17:17:25 -07:00
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2009-01-09 08:31:08 +11:00
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2005-06-21 17:17:25 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:05 +11:00
|
|
|
|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
|
|
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|
2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:41 +10:00
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2005-11-08 21:39:26 -08:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:27:40 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-28 20:11:48 -08:00
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2008-06-28 08:31:41 +10:00
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2007-02-28 20:11:48 -08:00
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2005-11-08 21:39:26 -08:00
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2008-08-07 10:02:47 -07:00
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2008-06-28 08:31:41 +10:00
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2005-11-08 21:39:26 -08:00
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2008-06-28 08:31:41 +10:00
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2005-11-08 21:39:26 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:26 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:17:27 -07:00
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2005-04-16 15:20:36 -07:00
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[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 08:31:05 +11:00
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|
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing
or disappearing, to detect failures, recovery starting, recovery completing,
and devices being added and removed.
It is similar to the poll-ability of /proc/mounts, though different in that:
We always report that the file is readable (because face it, it is, even if
only for EOF).
We report POLLPRI when there is a change so that select() can detect
it as an exceptional event. Not only are these exceptional events, but
that is the mechanism that the current 'mdadm' uses to watch for events
(It also polls after a timeout).
(We also report POLLERR like /proc/mounts).
Finally, we only reset the per-file event counter when the start of the file
is read, rather than when poll() returns an event. This is more robust as it
means that an fd will continue to report activity to poll/select until the
program clearly responds to that activity.
md_new_event takes an 'mddev' which isn't currently used, but it will be soon.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-06 00:20:30 -08:00
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2005-04-16 15:20:36 -07:00
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2008-06-28 08:31:41 +10:00
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2009-01-09 08:31:05 +11:00
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2008-06-28 08:31:41 +10:00
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2005-04-16 15:20:36 -07:00
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2008-04-30 00:52:32 -07:00
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2008-10-21 13:25:28 +11:00
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2008-04-30 00:52:32 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:58 -08:00
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2006-05-26 10:39:25 +10:00
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2008-08-05 15:54:13 +10:00
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2008-10-13 11:55:12 +11:00
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2006-05-26 10:39:25 +10:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2008-04-29 01:02:35 -07:00
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2005-04-16 15:20:36 -07:00
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2005-05-05 16:16:09 -07:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:15:59 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-14 00:34:09 -08:00
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2005-04-16 15:20:36 -07:00
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2008-10-13 11:55:12 +11:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2007-07-17 04:06:11 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:39:31 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-04 14:29:31 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:30:52 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-10 02:20:50 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-20 21:15:16 -07:00
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2006-10-03 01:15:59 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:39:58 -08:00
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2005-04-16 15:20:36 -07:00
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|
md: make devices disappear when they are no longer needed.
Currently md devices, once created, never disappear until the module
is unloaded. This is essentially because the gendisk holds a
reference to the mddev, and the mddev holds a reference to the
gendisk, this a circular reference.
If we drop the reference from mddev to gendisk, then we need to ensure
that the mddev is destroyed when the gendisk is destroyed. However it
is not possible to hook into the gendisk destruction process to enable
this.
So we drop the reference from the gendisk to the mddev and destroy the
gendisk when the mddev gets destroyed. However this has a
complication.
Between the call
__blkdev_get->get_gendisk->kobj_lookup->md_probe
and the call
__blkdev_get->md_open
there is no obvious way to hold a reference on the mddev any more, so
unless something is done, it will disappear and gendisk will be
destroyed prematurely.
Also, once we decide to destroy the mddev, there will be an unlockable
moment before the gendisk is unlinked (blk_unregister_region) during
which a new reference to the gendisk can be created. We need to
ensure that this reference can not be used. i.e. the ->open must
fail.
So:
1/ in md_probe we set a flag in the mddev (hold_active) which
indicates that the array should be treated as active, even
though there are no references, and no appearance of activity.
This is cleared by md_release when the device is closed if it
is no longer needed.
This ensures that the gendisk will survive between md_probe and
md_open.
2/ In md_open we check if the mddev we expect to open matches
the gendisk that we did open.
If there is a mismatch we return -ERESTARTSYS and modify
__blkdev_get to retry from the top in that case.
In the -ERESTARTSYS sys case we make sure to wait until
the old gendisk (that we succeeded in opening) is really gone so
we loop at most once.
Some udev configurations will always open an md device when it first
appears. If we allow an md device that was just created by an open
to disappear on an immediate close, then this can race with such udev
configurations and result in an infinite loop the device being opened
and closed, then re-open due to the 'ADD' even from the first open,
and then close and so on.
So we make sure an md device, once created by an open, remains active
at least until some md 'ioctl' has been made on it. This means that
all normal usage of md devices will allow them to disappear promptly
when not needed, but the worst that an incorrect usage will do it
cause an inactive md device to be left in existence (it can easily be
removed).
As an array can be stopped by writing to a sysfs attribute
echo clear > /sys/block/mdXXX/md/array_state
we need to use scheduled work for deleting the gendisk and other
kobjects. This allows us to wait for any pending gendisk deletion to
complete by simply calling flush_scheduled_work().
Signed-off-by: NeilBrown <neilb@suse.de>
2009-01-09 08:31:10 +11:00
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|
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|
2005-04-16 15:20:36 -07:00
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2007-07-09 11:56:42 -07:00
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|
2005-04-16 15:20:36 -07:00
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|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2006-01-06 00:20:52 -08:00
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|
|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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2006-07-10 04:44:18 -07:00
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|
|
2006-01-06 00:20:15 -08:00
|
|
|
|
2009-01-09 08:31:10 +11:00
|
|
|
|
[PATCH] md: allow md arrays to be started read-only (module parameter).
When an md array is started, the superblock will be written, and resync may
commense. This is not good if you want to be completely read-only as, for
example, when preparing to resume from a suspend-to-disk image.
So introduce a module parameter "start_ro" which can be set
to '1' at boot, at module load, or via
/sys/module/md_mod/parameters/start_ro
When this is set, new arrays get an 'auto-ro' mode, which disables all
internal io (superblock updates, resync, recovery) and is automatically
switched to 'rw' when the first write request arrives.
The array can be set to true 'ro' mode using 'mdadm -r' before the first
write request, or resync can be started without a write using 'mdadm -w'.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 21:39:36 -08:00
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|
2005-04-16 15:20:36 -07:00
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2005-08-04 12:53:32 -07:00
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2005-08-26 18:34:15 -07:00
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|
