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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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Kconfig	…
Makefile	…
acl.c	…
acl.h	…
balloc.c	ext4: Use new buffer_head flag to check uninit group bitmaps initialization	16 years ago
bitmap.c	ext4: Change unsigned long to unsigned int	16 years ago
dir.c	ext4: Make printk's consistently prefixed with "EXT4-fs: "	16 years ago
ext4.h	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	16 years ago
ext4_extents.h	ext4: Remove i_ext_generation from ext4_inode_info structure	16 years ago
ext4_i.h	ext4: Make ext4_group_t be an unsigned int	16 years ago
ext4_jbd2.c	ext4: Allow ext4 to run without a journal	16 years ago
ext4_jbd2.h	ext4: Remove "extents" mount option	16 years ago
ext4_sb.h	fs: introduce bgl_lock_ptr()	16 years ago
extents.c	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	16 years ago
file.c	ext4: sparse fixes	16 years ago
fsync.c	…
group.h	…
hash.c	ext4: Add support for non-native signed/unsigned htree hash algorithms	17 years ago
ialloc.c	ext4: Remove "extents" mount option	16 years ago
inode.c	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	16 years ago
ioctl.c	ext4: Allow ext4 to run without a journal	16 years ago
mballoc.c	ext4: Fix s_dirty_blocks_counter if block allocation failed with nodelalloc	16 years ago
mballoc.h	ext4: Don't allow new groups to be added during block allocation	16 years ago
migrate.c	ext4: Remove "extents" mount option	16 years ago
namei.c	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	16 years ago
namei.h	…
resize.c	ext4: mark the blocks/inode bitmap beyond end of group as used	16 years ago
super.c	filesystem freeze: add error handling of write_super_lockfs/unlockfs	16 years ago
symlink.c	…
xattr.c	ext4: Allow ext4 to run without a journal	16 years ago
xattr.h	…
xattr_security.c	…
xattr_trusted.c	…
xattr_user.c	…