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Takashi Sato c4be0c1dc4 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>		16 years ago
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acpi	…
asm-arm	…
asm-frv	NOMMU: Make VMAs per MM as for MMU-mode linux	16 years ago
asm-generic	remove linux/hardirq.h from asm-generic/local.h	16 years ago
asm-h8300	h8300: update timer handler - new files	17 years ago
asm-m32r	NOMMU: Make VMAs per MM as for MMU-mode linux	16 years ago
asm-m68k	…
asm-mn10300	mn10300: introduce asm/swab.h	16 years ago
crypto	…
drm	drm: Add a debug node for vblank state.	16 years ago
keys	…
linux	filesystem freeze: add error handling of write_super_lockfs/unlockfs	16 years ago
math-emu	…
media	V4L/DVB (10141): v4l2: debugging API changed to match against driver name instead of ID.	16 years ago
mtd	…
net	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx	16 years ago
pcmcia	…
rdma	…
rxrpc	…
scsi	…
sound	…
trace	…
video	…
xen	…
Kbuild	…