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authorTakashi Sato <t-sato@yk.jp.nec.com>2009-01-10 03:40:58 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-10 03:54:42 +0300
commitc4be0c1dc4cdc37b175579be1460f15ac6495e9a (patch)
tree716ea88318211ed27cadcebda0fd85c1f8246edb /fs/ext3
parent69347a236b22c3962ea812511495e502dedfd50c (diff)
downloadlinux-c4be0c1dc4cdc37b175579be1460f15ac6495e9a.tar.xz
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>
Diffstat (limited to 'fs/ext3')
-rw-r--r--fs/ext3/super.c45
1 files changed, 29 insertions, 16 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 5d047a030a73..b70d90e08a3c 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -48,8 +48,8 @@ static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
unsigned long journal_devnum);
static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
unsigned int);
-static void ext3_commit_super (struct super_block * sb,
- struct ext3_super_block * es,
+static int ext3_commit_super(struct super_block *sb,
+ struct ext3_super_block *es,
int sync);
static void ext3_mark_recovery_complete(struct super_block * sb,
struct ext3_super_block * es);
@@ -60,9 +60,9 @@ static const char *ext3_decode_error(struct super_block * sb, int errno,
char nbuf[16]);
static int ext3_remount (struct super_block * sb, int * flags, char * data);
static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
-static void ext3_unlockfs(struct super_block *sb);
+static int ext3_unfreeze(struct super_block *sb);
static void ext3_write_super (struct super_block * sb);
-static void ext3_write_super_lockfs(struct super_block *sb);
+static int ext3_freeze(struct super_block *sb);
/*
* Wrappers for journal_start/end.
@@ -759,8 +759,8 @@ static const struct super_operations ext3_sops = {
.put_super = ext3_put_super,
.write_super = ext3_write_super,
.sync_fs = ext3_sync_fs,
- .write_super_lockfs = ext3_write_super_lockfs,
- .unlockfs = ext3_unlockfs,
+ .freeze_fs = ext3_freeze,
+ .unfreeze_fs = ext3_unfreeze,
.statfs = ext3_statfs,
.remount_fs = ext3_remount,
.clear_inode = ext3_clear_inode,
@@ -2311,21 +2311,23 @@ static int ext3_create_journal(struct super_block * sb,
return 0;
}
-static void ext3_commit_super (struct super_block * sb,
- struct ext3_super_block * es,
+static int ext3_commit_super(struct super_block *sb,
+ struct ext3_super_block *es,
int sync)
{
struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
+ int error = 0;
if (!sbh)
- return;
+ return error;
es->s_wtime = cpu_to_le32(get_seconds());
es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
BUFFER_TRACE(sbh, "marking dirty");
mark_buffer_dirty(sbh);
if (sync)
- sync_dirty_buffer(sbh);
+ error = sync_dirty_buffer(sbh);
+ return error;
}
@@ -2439,12 +2441,14 @@ static int ext3_sync_fs(struct super_block *sb, int wait)
* LVM calls this function before a (read-only) snapshot is created. This
* gives us a chance to flush the journal completely and mark the fs clean.
*/
-static void ext3_write_super_lockfs(struct super_block *sb)
+static int ext3_freeze(struct super_block *sb)
{
+ int error = 0;
+ journal_t *journal;
sb->s_dirt = 0;
if (!(sb->s_flags & MS_RDONLY)) {
- journal_t *journal = EXT3_SB(sb)->s_journal;
+ journal = EXT3_SB(sb)->s_journal;
/* Now we set up the journal barrier. */
journal_lock_updates(journal);
@@ -2453,20 +2457,28 @@ static void ext3_write_super_lockfs(struct super_block *sb)
* We don't want to clear needs_recovery flag when we failed
* to flush the journal.
*/
- if (journal_flush(journal) < 0)
- return;
+ error = journal_flush(journal);
+ if (error < 0)
+ goto out;
/* Journal blocked and flushed, clear needs_recovery flag. */
EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
- ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+ error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+ if (error)
+ goto out;
}
+ return 0;
+
+out:
+ journal_unlock_updates(journal);
+ return error;
}
/*
* Called by LVM after the snapshot is done. We need to reset the RECOVER
* flag here, even though the filesystem is not technically dirty yet.
*/
-static void ext3_unlockfs(struct super_block *sb)
+static int ext3_unfreeze(struct super_block *sb)
{
if (!(sb->s_flags & MS_RDONLY)) {
lock_super(sb);
@@ -2476,6 +2488,7 @@ static void ext3_unlockfs(struct super_block *sb)
unlock_super(sb);
journal_unlock_updates(EXT3_SB(sb)->s_journal);
}
+ return 0;
}
static int ext3_remount (struct super_block * sb, int * flags, char * data)