2005-04-16 15:20:36 -07:00
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2008-06-05 22:46:27 -07:00
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2005-04-16 15:20:36 -07:00
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2006-08-29 19:06:09 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-08 00:24:32 -07:00
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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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2005-04-16 15:20:36 -07:00
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2008-02-18 13:48:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:55 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-06 14:49:55 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-08 00:24:32 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-24 03:18:05 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-03 01:14:01 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:04 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:04 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:36:35 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-09 15:59:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-01-09 15:59:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:33:20 -08:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:33:17 -08:00
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2005-04-16 15:20:36 -07:00
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2008-07-25 19:45:34 -07:00
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2005-04-16 15:20:36 -07:00
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2007-05-16 22:10:57 -07:00
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2006-03-27 01:17:57 -08:00
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2007-05-16 22:10:57 -07:00
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2006-03-27 01:17:57 -08:00
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2007-05-16 22:10:57 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-12 00:55:41 -08:00
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2005-04-16 15:20:36 -07:00
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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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|
[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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2006-03-26 01:37:24 -08:00
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2005-04-16 15:20:36 -07:00
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2006-03-24 03:16:06 -08:00
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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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2007-07-15 23:40:23 -07:00
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2005-04-16 15:20:36 -07:00
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2007-07-15 23:40:23 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-06-22 14:47:21 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-27 01:17:57 -08:00
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[PATCH] blockdev.c: check driver layer errors
Check driver layer errors.
Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
In blockdevc-check-errors.patch, add_bd_holder() is modified to return error
values when some of its operation failed. Among them, it returns -EEXIST when
a given bd_holder object already exists in the list.
However, in this case, the function completed its work successfully and need
no action by its caller other than freeing unused bd_holder object. So I
think it's better to return success after freeing by itself.
Otherwise, bd_claim-ing with same claim pointer will fail.
Typically, lvresize will fails with following message:
device-mapper: reload ioctl failed: Invalid argument
and you'll see messages like below in kernel log:
device-mapper: table: 254:13: linear: dm-linear: Device lookup failed
device-mapper: ioctl: error adding target to table
Similarly, it should not add bd_holder to the list if either one of symlinking
fails. I don't have a test case for this to happen but it should cause
dereference of freed pointer.
If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes
its job by just incrementing the reference count. In this case, it should be
considered as success but it used to return 'fail' to let the caller free
temporary bd_holder. Fixed it to return success and free given object by
itself.
Also, if either one of symlinking fails, the bd_holder should not be added to
the list so that it can be discarded later. Otherwise, the caller will free
bd_holder which is in the list.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 01:58:56 -07:00
|
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|
2006-03-27 01:17:57 -08:00
|
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|
|
|
|
|
|
[PATCH] blockdev.c: check driver layer errors
Check driver layer errors.
Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
In blockdevc-check-errors.patch, add_bd_holder() is modified to return error
values when some of its operation failed. Among them, it returns -EEXIST when
a given bd_holder object already exists in the list.
However, in this case, the function completed its work successfully and need
no action by its caller other than freeing unused bd_holder object. So I
think it's better to return success after freeing by itself.
Otherwise, bd_claim-ing with same claim pointer will fail.
Typically, lvresize will fails with following message:
device-mapper: reload ioctl failed: Invalid argument
and you'll see messages like below in kernel log:
device-mapper: table: 254:13: linear: dm-linear: Device lookup failed
device-mapper: ioctl: error adding target to table
Similarly, it should not add bd_holder to the list if either one of symlinking
fails. I don't have a test case for this to happen but it should cause
dereference of freed pointer.
If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes
its job by just incrementing the reference count. In this case, it should be
considered as success but it used to return 'fail' to let the caller free
temporary bd_holder. Fixed it to return success and free given object by
itself.
Also, if either one of symlinking fails, the bd_holder should not be added to
the list so that it can be discarded later. Otherwise, the caller will free
bd_holder which is in the list.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 01:58:56 -07:00
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2006-03-27 01:17:57 -08:00
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2008-08-25 19:56:12 +09:00
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2006-03-27 01:17:57 -08:00
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2008-08-25 19:56:11 +09:00
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2006-03-27 01:17:57 -08:00
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2006-10-30 16:23:56 -05:00
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2006-10-30 22:07:03 -08:00
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2006-10-30 16:23:56 -05:00
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2006-03-27 01:17:57 -08:00
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2006-10-30 16:23:56 -05:00
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2006-03-27 01:17:57 -08:00
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2006-10-30 16:23:56 -05:00
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2006-03-27 01:17:57 -08:00
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2007-07-15 23:41:25 -07:00
|
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2006-03-27 01:17:57 -08:00
|
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|
|
[PATCH] blockdev.c: check driver layer errors
Check driver layer errors.
Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
In blockdevc-check-errors.patch, add_bd_holder() is modified to return error
values when some of its operation failed. Among them, it returns -EEXIST when
a given bd_holder object already exists in the list.
However, in this case, the function completed its work successfully and need
no action by its caller other than freeing unused bd_holder object. So I
think it's better to return success after freeing by itself.
Otherwise, bd_claim-ing with same claim pointer will fail.
Typically, lvresize will fails with following message:
device-mapper: reload ioctl failed: Invalid argument
and you'll see messages like below in kernel log:
device-mapper: table: 254:13: linear: dm-linear: Device lookup failed
device-mapper: ioctl: error adding target to table
Similarly, it should not add bd_holder to the list if either one of symlinking
fails. I don't have a test case for this to happen but it should cause
dereference of freed pointer.
If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes
its job by just incrementing the reference count. In this case, it should be
considered as success but it used to return 'fail' to let the caller free
temporary bd_holder. Fixed it to return success and free given object by
itself.
Also, if either one of symlinking fails, the bd_holder should not be added to
the list so that it can be discarded later. Otherwise, the caller will free
bd_holder which is in the list.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 01:58:56 -07:00
|
|
|
|
2006-03-27 01:17:57 -08:00
|
|
|
|
|
|
|
|
|
[PATCH] blockdev.c: check driver layer errors
Check driver layer errors.
Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
In blockdevc-check-errors.patch, add_bd_holder() is modified to return error
values when some of its operation failed. Among them, it returns -EEXIST when
a given bd_holder object already exists in the list.
However, in this case, the function completed its work successfully and need
no action by its caller other than freeing unused bd_holder object. So I
think it's better to return success after freeing by itself.
Otherwise, bd_claim-ing with same claim pointer will fail.
Typically, lvresize will fails with following message:
device-mapper: reload ioctl failed: Invalid argument
and you'll see messages like below in kernel log:
device-mapper: table: 254:13: linear: dm-linear: Device lookup failed
device-mapper: ioctl: error adding target to table
Similarly, it should not add bd_holder to the list if either one of symlinking
fails. I don't have a test case for this to happen but it should cause
dereference of freed pointer.
If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes
its job by just incrementing the reference count. In this case, it should be
considered as success but it used to return 'fail' to let the caller free
temporary bd_holder. Fixed it to return success and free given object by
itself.
Also, if either one of symlinking fails, the bd_holder should not be added to
the list so that it can be discarded later. Otherwise, the caller will free
bd_holder which is in the list.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 01:58:56 -07:00
|
|
|
|
2006-03-27 01:17:57 -08:00
|
|
|
|
2007-07-15 23:41:25 -07:00
|
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|
|
|
|
|
[PATCH] blockdev.c: check driver layer errors
Check driver layer errors.
Fix from: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
In blockdevc-check-errors.patch, add_bd_holder() is modified to return error
values when some of its operation failed. Among them, it returns -EEXIST when
a given bd_holder object already exists in the list.
However, in this case, the function completed its work successfully and need
no action by its caller other than freeing unused bd_holder object. So I
think it's better to return success after freeing by itself.
Otherwise, bd_claim-ing with same claim pointer will fail.
Typically, lvresize will fails with following message:
device-mapper: reload ioctl failed: Invalid argument
and you'll see messages like below in kernel log:
device-mapper: table: 254:13: linear: dm-linear: Device lookup failed
device-mapper: ioctl: error adding target to table
Similarly, it should not add bd_holder to the list if either one of symlinking
fails. I don't have a test case for this to happen but it should cause
dereference of freed pointer.
If a matching bd_holder is found in bd_holder_list, add_bd_holder() completes
its job by just incrementing the reference count. In this case, it should be
considered as success but it used to return 'fail' to let the caller free
temporary bd_holder. Fixed it to return success and free given object by
itself.
Also, if either one of symlinking fails, the bd_holder should not be added to
the list so that it can be discarded later. Otherwise, the caller will free
bd_holder which is in the list.
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-29 01:58:56 -07:00
|
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|
2007-07-15 23:41:25 -07:00
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2006-03-27 01:17:57 -08:00
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2007-07-15 23:41:25 -07:00
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2006-10-30 16:23:56 -05:00
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2006-03-27 01:17:57 -08:00
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2006-12-08 02:36:13 -08:00
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2006-10-30 16:23:56 -05:00
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2007-07-15 23:41:25 -07:00
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2007-07-15 23:41:28 -07:00
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2007-07-15 23:41:25 -07:00
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2007-07-15 23:41:28 -07:00
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2007-07-15 23:41:25 -07:00
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2007-07-15 23:41:28 -07:00
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2006-03-27 01:18:00 -08:00
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2007-07-15 23:41:28 -07:00
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2007-07-15 23:41:25 -07:00
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2006-03-27 01:17:57 -08:00
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2006-12-08 02:36:13 -08:00
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2006-03-27 01:17:57 -08:00
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2007-07-15 23:41:28 -07:00
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2006-03-27 01:18:00 -08:00
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2006-03-27 01:17:57 -08:00
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2005-04-16 15:20:36 -07:00
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2008-09-02 15:28:45 -04:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-09-04 14:27:40 -06:00
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2008-09-04 14:27:25 -06:00
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2008-10-09 10:42:38 +02:00
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2008-09-04 14:27:25 -06:00
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2008-09-04 14:27:45 -06:00
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2008-09-04 14:27:25 -06:00
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2008-09-04 14:27:20 -06:00
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2008-10-09 10:42:38 +02:00
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2008-09-04 14:27:20 -06:00
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2008-09-04 14:27:25 -06:00
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2008-09-04 14:27:20 -06:00
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2008-09-04 14:27:25 -06:00
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2008-09-04 14:27:20 -06:00
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2005-04-16 15:20:36 -07:00
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2008-09-04 14:27:40 -06:00
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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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[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
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2007-02-20 13:58:18 -08:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-06-05 22:46:27 -07:00
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2008-09-03 09:01:09 +02:00
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2008-06-23 08:30:55 -04:00
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2007-10-08 13:24:05 -04:00
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2008-06-23 08:30:55 -04:00
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2007-10-08 13:24:05 -04:00
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2008-06-23 08:30:55 -04:00
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2008-08-01 05:32:04 -04:00
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2008-06-05 22:46:27 -07:00
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2008-08-01 05:32:04 -04:00
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2008-06-05 22:46:27 -07:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2008-11-05 10:21:06 +01:00
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2008-09-03 09:01:09 +02:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2006-12-08 02:36:16 -08:00
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2005-04-16 15:20:36 -07:00
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2008-09-03 09:01:09 +02:00
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2005-04-16 15:20:36 -07:00
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2008-11-05 10:21:06 +01:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
|
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|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
|
|
2007-10-08 13:24:05 -04:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
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|
2008-08-25 19:56:12 +09:00
|
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|
2005-04-16 15:20:36 -07:00
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2008-11-05 10:21:06 +01:00
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2008-09-03 09:03:02 +02:00
|
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2008-11-05 10:21:06 +01:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2008-11-05 10:21:06 +01:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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|
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
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2006-03-23 03:00:28 -08:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2008-11-05 10:21:06 +01:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2006-03-23 03:00:28 -08:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2008-08-25 19:56:12 +09:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2006-10-28 10:38:33 -07:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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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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2008-02-22 20:40:24 -05:00
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2006-12-08 02:36:13 -08:00
|
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[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
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2006-12-08 02:36:13 -08:00
|
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2006-12-08 02:36:16 -08:00
|
|
|
|
2006-12-08 02:36:13 -08:00
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
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2006-12-08 02:36:13 -08:00
|
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2008-02-22 20:40:24 -05:00
|
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|
2006-12-08 02:36:13 -08:00
|
|
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2008-08-25 19:56:12 +09:00
|
|
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|
|
|
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|
2006-12-08 02:36:13 -08:00
|
|
|
|
|
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
|
|
|
|
|
|
|
2006-12-08 02:36:13 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
|
|
2008-02-22 20:40:24 -05:00
|
|
|
|
2006-12-08 02:36:13 -08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2008-02-22 20:40:24 -05:00
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
|
|
2008-02-22 20:40:24 -05:00
|
|
|
|
[PATCH] lockdep: simplify some aspects of bd_mutex nesting
When we open (actually blkdev_get) a partition we need to also open (get) the
whole device that holds the partition. The involves some limited recursion.
This patch tries to simplify some aspects of this.
As well as opening the whole device, we need to increment ->bd_part_count when
a partition is opened (this is used by rescan_partitions to avoid a rescan if
any partition is active, as that would be confusing).
The main change this patch makes is to move the inc/dec of bd_part_count into
blkdev_{get,put} for the whole rather than doing it in blkdev_{get,put} for
the partition.
More specifically, we introduce __blkdev_get and __blkdev_put which do exactly
what blkdev_{get,put} did, only with an extra "for_part" argument
(blkget_{get,put} then call the __ version with a '0' for the extra argument).
If for_part is 1, then the blkdev is being get(put) because a partition is
being opened(closed) for the first(last) time, and so bd_part_count should be
updated (on success). The particular advantage of pushing this function down
is that the bd_mutex lock (which is needed to update bd_part_count) is already
held at the lower level.
Note that this slightly changes the semantics of bd_part_count. Instead of
updating it whenever a partition is opened or released, it is now only updated
on the first open or last release. This is an adequate semantic as it is only
ever tested for "== 0".
Having introduced these functions we remove the current bd_part_count updates
from do_open (which is really the body of blkdev_get) and call
__blkdev_get(... 1). Similarly in blkget_put we remove the old bd_part_count
updates and call __blkget_put(..., 1). This call is moved to the end of
__blkdev_put to avoid nested locks of bd_mutex.
Finally the mutex_lock on whole->bd_mutex in do_open can be removed. It was
only really needed to protect bd_part_count, and that is now managed (and
protected) within the recursive call.
The observation that bd_part_count is central to the locking issues, and the
modifications to create __blkdev_put are from Peter Zijlstra.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 02:36:16 -08:00
|
|
|
|
2006-12-08 02:36:13 -08:00
|
|
|
|
|
|
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|
|
2005-04-16 15:20:36 -07:00
|
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2008-02-22 20:40:24 -05:00
|
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2005-04-16 15:20:36 -07:00
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2005-06-23 00:10:15 -07:00
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2005-04-16 15:20:36 -07:00
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2008-09-19 03:17:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-02-18 13:48:31 +01:00
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:25:04 -07:00
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2005-04-16 15:20:36 -07:00
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2006-03-28 01:56:42 -08:00
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2005-04-16 15:20:36 -07:00
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2006-09-30 23:28:48 -07:00
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2005-04-16 15:20:36 -07:00
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2006-09-30 23:28:46 -07:00
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2005-04-16 15:20:36 -07:00
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2005-06-23 00:10:15 -07:00
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2005-04-16 15:20:36 -07:00
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2006-05-01 19:59:32 +02:00
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2005-04-16 15:20:36 -07:00
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2008-09-19 03:17:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-10-16 07:46:23 +02:00
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2005-04-16 15:20:36 -07:00
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2008-10-09 10:42:38 +02:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-02 01:04:36 -04:00
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2005-04-16 15:20:36 -07:00
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2008-08-01 05:00:11 -04:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2007-10-08 13:24:05 -04:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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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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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2005-04-16 15:20:36 -07:00
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2008-02-22 19:50:45 -05:00
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2006-08-29 19:06:11 +01:00
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2007-05-06 14:49:54 -07:00
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2006-08-29 19:06:11 +01:00
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