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Date: Fri, 26 Sep 2008 17:57:31 +0900
From: Takashi Sato <t-sato@...jp.nec.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Christoph Hellwig <hch@...radead.org>,
"xfs@....sgi.com" <xfs@....sgi.com>,
"axboe@...nel.dk" <axboe@...nel.dk>,
"mtk.manpages@...glemail.com" <mtk.manpages@...glemail.com>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
"dm-devel@...hat.com" <dm-devel@...hat.com>,
"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/10] ext3: Fix error handling in write_super_lockfs/unlockfs
Changed write_super_lockfs so that it returns an error in case of an failure.
unlockfs always returns 0.
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@...jp.nec.com>
---
super.c | 44 +++++++++++++++++++++++++++++---------------
1 file changed, 29 insertions(+), 15 deletions(-)
diff -uprN -X linux-2.6.27-rc7-lockfs/Documentation/dontdiff linux-2.6.27-rc7-lockfs/fs/ext3/super.c linux-2.6.27-rc7-lo
ckfs-ext3/fs/ext3/super.c
--- linux-2.6.27-rc7-lockfs/fs/ext3/super.c 2008-09-22 07:29:55.000000000 +0900
+++ linux-2.6.27-rc7-lockfs-ext3/fs/ext3/super.c 2008-09-26 16:54:41.000000000 +0900
@@ -48,8 +48,8 @@ static int ext3_load_journal(struct supe
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(str
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.
@@ -728,8 +728,8 @@ static const struct super_operations ext
.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,
@@ -2251,21 +2251,23 @@ static int ext3_create_journal(struct su
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;
}
@@ -2379,28 +2381,39 @@ static int ext3_sync_fs(struct super_blo
* 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);
- journal_flush(journal);
+ error = journal_flush(journal);
+ if (error)
+ 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);
@@ -2410,6 +2423,7 @@ static void ext3_unlockfs(struct super_b
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)
--
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