2005-04-16 15:20:36 -07:00
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2006-09-29 01:58:57 -07:00
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2005-04-16 15:20:36 -07:00
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2006-01-11 12:17:46 -08:00
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[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2005-04-16 15:20:36 -07:00
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2006-08-14 22:43:23 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-30 20:52:18 +02:00
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2008-02-06 01:37:57 -08:00
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2008-03-26 22:11:34 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:07 -05:00
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2007-07-15 23:41:25 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:37:57 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:15:49 -05:00
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2008-03-26 22:11:34 +01:00
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2008-03-27 13:06:23 +01:00
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2005-04-16 15:20:36 -07:00
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2006-03-26 01:37:24 -08:00
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2006-12-06 20:33:20 -08:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2006-01-16 22:14:23 -08:00
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2007-10-29 14:17:23 -06:00
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2006-01-16 22:14:23 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2008-02-06 01:37:57 -08:00
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2005-04-16 15:20:36 -07:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-03-26 22:11:34 +01:00
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2008-03-27 13:06:23 +01:00
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2005-04-16 15:20:36 -07:00
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2007-02-10 01:45:03 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 22:11:34 +01:00
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2008-07-21 18:06:36 +08:00
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2008-03-26 22:11:34 +01:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-07-07 17:57:30 -07:00
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2005-11-07 17:19:33 -05:00
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2005-11-07 17:20:48 -05:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-21 18:06:36 +08:00
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2005-04-16 15:20:36 -07:00
|
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|
|
|
|
|
|
|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:38:00 -08:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:37:30 -08:00
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[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:37:30 -08:00
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[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-07-25 19:45:40 -07:00
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[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:37:30 -08:00
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[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:37:30 -08:00
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2008-02-15 14:38:00 -08:00
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2008-02-15 14:37:30 -08:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:38:00 -08:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:38:00 -08:00
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|
|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2008-02-15 14:37:30 -08:00
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2008-02-15 14:38:00 -08:00
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[PATCH] VFS: Permit filesystem to override root dentry on mount
Extend the get_sb() filesystem operation to take an extra argument that
permits the VFS to pass in the target vfsmount that defines the mountpoint.
The filesystem is then required to manually set the superblock and root dentry
pointers. For most filesystems, this should be done with simple_set_mnt()
which will set the superblock pointer and then set the root dentry to the
superblock's s_root (as per the old default behaviour).
The get_sb() op now returns an integer as there's now no need to return the
superblock pointer.
This patch permits a superblock to be implicitly shared amongst several mount
points, such as can be done with NFS to avoid potential inode aliasing. In
such a case, simple_set_mnt() would not be called, and instead the mnt_root
and mnt_sb would be set directly.
The patch also makes the following changes:
(*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
pointer argument and return an integer, so most filesystems have to change
very little.
(*) If one of the convenience function is not used, then get_sb() should
normally call simple_set_mnt() to instantiate the vfsmount. This will
always return 0, and so can be tail-called from get_sb().
(*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
dcache upon superblock destruction rather than shrink_dcache_anon().
This is required because the superblock may now have multiple trees that
aren't actually bound to s_root, but that still need to be cleaned up. The
currently called functions assume that the whole tree is rooted at s_root,
and that anonymous dentries are not the roots of trees which results in
dentries being left unculled.
However, with the way NFS superblock sharing are currently set to be
implemented, these assumptions are violated: the root of the filesystem is
simply a dummy dentry and inode (the real inode for '/' may well be
inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
with child trees.
[*] Anonymous until discovered from another tree.
(*) The documentation has been adjusted, including the additional bit of
changing ext2_* into foo_* in the documentation.
[akpm@osdl.org: convert ipath_fs, do other stuff]
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:02:57 -07:00
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2005-04-16 15:20:36 -07:00
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2008-03-26 22:11:34 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:15:49 -05:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:15:49 -05:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:50 -05:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-11-07 17:19:50 -05:00
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2008-03-21 20:48:19 -04:00
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2005-11-07 17:19:50 -05:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:19:50 -05:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:19:50 -05:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:21:20 -05:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:23 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:21:01 -05:00
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2007-06-07 12:20:32 -04:00
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2005-11-07 17:21:01 -05:00
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2005-11-07 17:19:50 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:23 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:13:39 -05:00
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2005-04-16 15:20:36 -07:00
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|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
|
[PATCH] r/o bind mounts: track numbers of writers to mounts
This is the real meat of the entire series. It actually
implements the tracking of the number of writers to a mount.
However, it causes scalability problems because there can be
hundreds of cpus doing open()/close() on files on the same mnt at
the same time. Even an atomic_t in the mnt has massive scalaing
problems because the cacheline gets so terribly contended.
This uses a statically-allocated percpu variable. All want/drop
operations are local to a cpu as long that cpu operates on the same
mount, and there are no writer count imbalances. Writer count
imbalances happen when a write is taken on one cpu, and released
on another, like when an open/close pair is performed on two
Upon a remount,ro request, all of the data from the percpu
variables is collected (expensive, but very rare) and we determine
if there are any outstanding writers to the mount.
I've written a little benchmark to sit in a loop for a couple of
seconds in several cpus in parallel doing open/write/close loops.
http://sr71.net/~dave/linux/openbench.c
The code in here is a a worst-possible case for this patch. It
does opens on a _pair_ of files in two different mounts in parallel.
This should cause my code to lose its "operate on the same mount"
optimization completely. This worst-case scenario causes a 3%
degredation in the benchmark.
I could probably get rid of even this 3%, but it would be more
complex than what I have here, and I think this is getting into
acceptable territory. In practice, I expect writing more than 3
bytes to a file, as well as disk I/O to mask any effects that this
has.
(To get rid of that 3%, we could have an #defined number of mounts
in the percpu variable. So, instead of a CPU getting operate only
on percpu data when it accesses only one mount, it could stay on
percpu data when it only accesses N or fewer mounts.)
[AV] merged fix for __clear_mnt_mount() stepping on freed vfsmount
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-02-15 14:37:59 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:13:39 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:21:35 -08:00
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2008-03-27 13:06:24 +01:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:24 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2008-03-27 13:06:24 +01:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:24 +01:00
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2007-07-15 23:39:55 -07:00
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2008-03-27 13:06:24 +01:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2008-07-04 09:47:13 +10:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2008-07-04 09:47:13 +10:00
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2008-03-27 13:06:25 +01:00
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2005-04-16 15:20:36 -07:00
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2006-01-09 20:52:17 -08:00
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2006-12-13 00:34:34 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2008-02-14 19:38:43 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:38:43 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2008-02-15 14:38:00 -08:00
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2008-07-04 09:47:13 +10:00
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2008-03-27 13:06:25 +01:00
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2005-04-16 15:20:36 -07:00
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2008-07-04 09:47:13 +10:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:24 +01:00
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2005-04-16 15:20:36 -07:00
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2008-03-27 13:06:25 +01:00
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2008-03-27 13:06:26 +01:00
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2008-03-27 13:06:25 +01:00
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2008-07-04 09:47:13 +10:00
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2008-03-27 13:06:25 +01:00
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2008-07-04 09:47:13 +10:00
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2008-03-27 13:06:25 +01:00
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2006-03-20 13:44:12 -05:00
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2007-07-15 23:39:55 -07:00
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2008-02-14 19:38:43 -08:00
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2006-03-20 13:44:12 -05:00
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2008-02-14 19:38:43 -08:00
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2006-03-20 13:44:12 -05:00
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2008-03-27 13:06:25 +01:00
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2006-03-20 13:44:12 -05:00
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2008-03-27 13:06:24 +01:00
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2006-03-20 13:44:12 -05:00
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2008-03-27 13:06:24 +01:00
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2006-03-20 13:44:12 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:14:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:14:51 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:14:51 -08:00
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2005-11-07 17:20:17 -05:00
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2006-03-27 01:14:51 -08:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:17:04 -05:00
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2006-01-08 01:03:19 -08:00
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|
Introduce a handy list_first_entry macro
There are many places in the kernel where the construction like
foo = list_entry(head->next, struct foo_struct, list);
are used.
The code might look more descriptive and neat if using the macro
list_first_entry(head, type, member) \
list_entry((head)->next, type, member)
Here is the macro itself and the examples of its usage in the generic code.
If it will turn out to be useful, I can prepare the set of patches to
inject in into arch-specific code, drivers, networking, etc.
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: John McCutchan <ttb@tentacle.dhs.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-08 00:30:19 -07:00
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2005-11-07 17:17:04 -05:00
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2008-03-21 23:59:49 -04:00
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2005-11-07 17:17:04 -05:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2006-06-26 00:24:40 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-11-07 17:17:04 -05:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:17:04 -05:00
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2008-03-21 23:59:49 -04:00
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2006-02-01 07:53:21 -05:00
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2008-03-21 23:59:49 -04:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 00:46:23 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:04 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-04-24 07:21:56 -04:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:15:49 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 00:46:23 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-11-07 17:17:04 -05:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:31 -08:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-08 21:35:04 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:21:20 -05:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2005-09-10 00:27:07 -07:00
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2008-04-29 00:59:40 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:21:20 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-11-07 17:17:22 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:04 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:04 -05:00
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2005-04-16 15:20:36 -07:00
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2007-06-07 12:20:32 -04:00
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2008-03-22 16:19:49 -04:00
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2007-06-07 12:20:32 -04:00
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2008-03-22 16:19:49 -04:00
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2007-06-07 12:20:32 -04:00
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2008-03-22 16:19:49 -04:00
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2007-06-07 12:20:32 -04:00
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2008-03-22 16:19:49 -04:00
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2007-06-07 12:20:32 -04:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:20:03 -05:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:21:20 -05:00
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2005-11-07 17:19:50 -05:00
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2005-11-07 17:21:01 -05:00
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2005-11-07 17:21:20 -05:00
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2005-11-07 17:21:01 -05:00
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2005-11-07 17:20:03 -05:00
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2005-11-07 17:21:01 -05:00
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2005-11-07 17:19:50 -05:00
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2008-03-21 20:48:19 -04:00
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2005-11-07 17:19:50 -05:00
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2008-03-21 20:48:19 -04:00
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2005-11-07 17:19:50 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:50 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:50 -05:00
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2008-03-21 20:48:19 -04:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:20:03 -05:00
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2005-11-07 17:19:50 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:50 -05:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:19:07 -05:00
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2008-02-08 04:22:12 -08:00
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2005-11-07 17:19:07 -05:00
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2008-02-08 04:22:12 -08:00
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2005-11-07 17:19:07 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:19:07 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:07 -05:00
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2007-05-08 00:30:40 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:19:07 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:07 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:07 -05:00
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2008-03-27 13:06:23 +01:00
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2005-11-07 17:19:07 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:22:12 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:22:12 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:21:20 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:15:04 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:15:04 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:15:04 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:15:04 -05:00
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2008-03-22 18:00:39 -04:00
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2005-11-07 17:15:04 -05:00
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2005-11-07 17:17:04 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:04 -05:00
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2005-11-07 17:16:29 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:15:04 -05:00
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2005-11-07 17:17:51 -05:00
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2008-02-14 19:34:35 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-15 14:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:22:12 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-08 04:22:12 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-15 14:38:00 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:21:20 -05:00
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2008-02-08 04:22:12 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-11-07 17:21:20 -05:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:21:20 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2008-02-14 19:34:32 -08:00
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2005-11-07 17:20:03 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:32 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2008-02-08 04:22:12 -08:00
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2008-08-01 09:05:54 -04:00
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2008-08-01 09:05:54 -04:00
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2005-11-07 17:16:29 -05:00
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2008-03-22 16:14:30 -04:00
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2008-03-22 00:21:53 -04:00
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2006-06-09 09:34:17 -04:00
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2006-06-09 09:34:17 -04:00
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2008-03-22 00:46:23 -04:00
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2008-03-22 00:46:23 -04:00
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2006-06-09 09:34:17 -04:00
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2008-03-22 00:46:23 -04:00
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2005-11-07 17:16:09 -05:00
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2006-01-09 20:52:17 -08:00
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2006-12-13 00:34:34 -08:00
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2008-02-15 14:38:00 -08:00
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2006-01-09 20:52:17 -08:00
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2007-10-18 23:40:02 -07:00
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2008-03-22 17:48:24 -04:00
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2005-04-16 15:20:36 -07:00
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[PATCH] revert "vfs: propagate mnt_flags into do_loopback/vfsmount"
Revert commit f6422f17d3a480f21917a3895e2a46b968f56a08, due to
Valdis.Kletnieks@vt.edu wrote:
>
> There seems to have been a bug introduced in this changeset:
>
> Am running 2.6.17-rc3-mm1. When this changeset is applied, 'mount --bind'
> misbehaves:
>
> > # mkdir /foo
> > # mount -t tmpfs -o rw,nosuid,nodev,noexec,noatime,nodiratime none /foo
> > # mkdir /foo/bar
> > # mount --bind /foo/bar /foo
> > # tail -2 /proc/mounts
> > none /foo tmpfs rw,nosuid,nodev,noexec,noatime,nodiratime 0 0
> > none /foo tmpfs rw 0 0
>
> Reverting this changeset causes both mounts to have the same options.
>
> (Thanks to Stephen Smalley for tracking down the changeset...)
>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: <Valdis.Kletnieks@vt.edu>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-05-15 09:44:30 -07:00
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2008-02-14 19:34:35 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-07 12:59:00 -08:00
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2007-05-08 00:25:21 -07:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2008-05-10 20:44:54 -04:00
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2006-12-08 02:37:56 -08:00
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2007-07-15 23:41:06 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:15:49 -05:00
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2006-12-08 02:37:56 -08:00
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2007-07-15 23:41:06 -07:00
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2006-12-08 02:37:56 -08:00
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2006-12-08 02:37:56 -08:00
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2008-02-14 19:34:38 -08:00
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2008-02-14 19:34:38 -08:00
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2008-02-14 19:34:38 -08:00
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2008-02-14 19:34:38 -08:00
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2006-12-08 02:37:56 -08:00
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2006-02-07 12:59:00 -08:00
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2007-07-15 23:41:15 -07:00
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2007-05-08 00:25:21 -07:00
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2006-02-07 12:59:00 -08:00
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2006-12-08 02:37:56 -08:00
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2006-02-07 12:59:00 -08:00
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2007-05-08 00:25:21 -07:00
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2006-12-08 02:37:56 -08:00
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2006-02-07 12:59:00 -08:00
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2007-05-08 00:25:21 -07:00
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2006-02-07 12:59:00 -08:00
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2007-05-08 00:25:21 -07:00
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2006-02-07 12:59:00 -08:00
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2006-12-08 02:37:56 -08:00
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2007-05-08 00:25:21 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2006-01-08 01:03:18 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2008-02-14 19:34:38 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2008-03-22 18:00:39 -04:00
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2005-11-07 17:20:03 -05:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-22 18:00:39 -04:00
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2005-09-06 15:19:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-09-06 15:19:36 -07:00
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2008-02-14 19:34:32 -08:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2008-03-22 18:00:39 -04:00
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2008-02-14 19:34:32 -08:00
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2008-07-22 09:59:21 -04:00
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2008-02-14 19:34:32 -08:00
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2008-07-22 09:59:21 -04:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-03-21 20:48:19 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-11-07 17:17:51 -05:00
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2008-03-22 18:00:39 -04:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2008-07-22 09:59:21 -04:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2008-02-14 19:34:39 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 23:26:30 -07:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:37:57 -08:00
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2006-09-29 01:58:57 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2007-07-20 10:11:58 +09:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:16:09 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-06 01:37:57 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-29 01:58:57 -07:00
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2008-04-30 00:55:09 -07:00
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2007-10-29 14:17:23 -06:00
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2008-04-30 00:55:09 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:37:56 -08:00
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2005-11-07 17:17:04 -05:00
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2006-12-08 02:37:56 -08:00
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2005-07-07 17:57:24 -07:00
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2005-11-07 17:17:51 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:20:17 -05:00
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2005-04-16 15:20:36 -07:00
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2005-11-07 17:17:51 -05:00
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2005-11-07 17:17:04 -05:00
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2006-12-08 02:37:56 -08:00
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2005-04-16 15:20:36 -07:00
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