]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
filesystem freeze: add error handling of write_super_lockfs/unlockfs
authorTakashi Sato <t-sato@yk.jp.nec.com>
Sat, 10 Jan 2009 00:40:58 +0000 (16:40 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 10 Jan 2009 00:54:42 +0000 (16:54 -0800)
commitc4be0c1dc4cdc37b175579be1460f15ac6495e9a
tree716ea88318211ed27cadcebda0fd85c1f8246edb
parent69347a236b22c3962ea812511495e502dedfd50c
filesystem freeze: add error handling of write_super_lockfs/unlockfs

Currently, ext3 in mainline Linux doesn't have the freeze feature which
suspends write requests.  So, we cannot take a backup which keeps the
filesystem's consistency with the storage device's features (snapshot and
replication) while it is mounted.

In many case, a commercial filesystem (e.g.  VxFS) has the freeze feature
and it would be used to get the consistent backup.

If Linux's standard filesystem ext3 has the freeze feature, we can do it
without a commercial filesystem.

So I have implemented the ioctls of the freeze feature.
I think we can take the consistent backup with the following steps.
1. Freeze the filesystem with the freeze ioctl.
2. Separate the replication volume or create the snapshot
   with the storage device's feature.
3. Unfreeze the filesystem with the unfreeze ioctl.
4. Take the backup from the separated replication volume
   or the snapshot.

This patch:

VFS:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that they can return an error.
Rename write_super_lockfs and unlockfs of the super block operation
freeze_fs and unfreeze_fs to avoid a confusion.

ext3, ext4, xfs, gfs2, jfs:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that write_super_lockfs returns an error if needed,
and unlockfs always returns 0.

reiserfs:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that they always return 0 (success) to keep a current behavior.

Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@ys.jp.nec.com>
Cc: <xfs-masters@oss.sgi.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 files changed:
Documentation/filesystems/Locking
Documentation/filesystems/vfs.txt
fs/buffer.c
fs/ext3/super.c
fs/ext4/super.c
fs/gfs2/ops_super.c
fs/jfs/super.c
fs/reiserfs/super.c
fs/xfs/linux-2.6/xfs_super.c
fs/xfs/xfs_fsops.c
fs/xfs/xfs_fsops.h
include/linux/fs.h