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[PATCH 3/10] ext4: Fix error handling in write_super_lockfs/unlockfs

To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "dm-devel@xxxxxxxxxx" <dm-devel@xxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "mtk.manpages@xxxxxxxxxxxxxx" <mtk.manpages@xxxxxxxxxxxxxx>
Subject: [PATCH 3/10] ext4: Fix error handling in write_super_lockfs/unlockfs
From: Takashi Sato <t-sato@xxxxxxxxxxxxx>
Date: Fri, 26 Sep 2008 17:57:46 +0900
Cc: "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@xxxxxxxxxxxxx>
---
 super.c |   40 +++++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 13 deletions(-)

diff -uprN -X linux-2.6.27-rc7-lockfs-ext3/Documentation/dontdiff 
linux-2.6.27-rc7-lockfs-ext3/fs/ext4/super.c linux-2.6
.27-rc7-lockfs-ext4/fs/ext4/super.c
--- linux-2.6.27-rc7-lockfs-ext3/fs/ext4/super.c        2008-09-26 
11:44:53.000000000 +0900
+++ linux-2.6.27-rc7-lockfs-ext4/fs/ext4/super.c        2008-09-26 
16:55:57.000000000 +0900
@@ -49,7 +49,7 @@ static int ext4_load_journal(struct supe
                             unsigned long journal_devnum);
 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
                               unsigned int);
-static void ext4_commit_super(struct super_block *sb,
+static int ext4_commit_super(struct super_block *sb,
                              struct ext4_super_block *es, int sync);
 static void ext4_mark_recovery_complete(struct super_block *sb,
                                        struct ext4_super_block *es);
@@ -60,9 +60,9 @@ static const char *ext4_decode_error(str
                                     char nbuf[16]);
 static int ext4_remount(struct super_block *sb, int *flags, char *data);
 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
-static void ext4_unlockfs(struct super_block *sb);
+static int ext4_unfreeze(struct super_block *sb);
 static void ext4_write_super(struct super_block *sb);
-static void ext4_write_super_lockfs(struct super_block *sb);
+static int ext4_freeze(struct super_block *sb);
 
 
 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
@@ -875,8 +875,8 @@ static const struct super_operations ext
        .put_super      = ext4_put_super,
        .write_super    = ext4_write_super,
        .sync_fs        = ext4_sync_fs,
-       .write_super_lockfs = ext4_write_super_lockfs,
-       .unlockfs       = ext4_unlockfs,
+       .freeze_fs      = ext4_freeze,
+       .unfreeze_fs    = ext4_unfreeze,
        .statfs         = ext4_statfs,
        .remount_fs     = ext4_remount,
        .clear_inode    = ext4_clear_inode,
@@ -2792,20 +2792,22 @@ static int ext4_create_journal(struct su
        return 0;
 }
 
-static void ext4_commit_super(struct super_block *sb,
+static int ext4_commit_super(struct super_block *sb,
                              struct ext4_super_block *es, int sync)
 {
        struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
+       int error = 0;
 
        if (!sbh)
-               return;
+               return error;
        es->s_wtime = cpu_to_le32(get_seconds());
        ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
        es->s_free_inodes_count = cpu_to_le32(ext4_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;
 }
 
 
@@ -2919,28 +2921,39 @@ static int ext4_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 ext4_write_super_lockfs(struct super_block *sb)
+static int ext4_freeze(struct super_block *sb)
 {
+       int error = 0;
+       journal_t *journal;
        sb->s_dirt = 0;
 
        if (!(sb->s_flags & MS_RDONLY)) {
-               journal_t *journal = EXT4_SB(sb)->s_journal;
+               journal = EXT4_SB(sb)->s_journal;
 
                /* Now we set up the journal barrier. */
                jbd2_journal_lock_updates(journal);
-               jbd2_journal_flush(journal);
+               error = jbd2_journal_flush(journal);
+               if (error)
+                       goto out;
 
                /* Journal blocked and flushed, clear needs_recovery flag. */
                EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
-               ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
+               error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
+               if (error)
+                       goto out;
        }
+       return 0;
+
+out:
+       jbd2_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 ext4_unlockfs(struct super_block *sb)
+static int ext4_unfreeze(struct super_block *sb)
 {
        if (!(sb->s_flags & MS_RDONLY)) {
                lock_super(sb);
@@ -2950,6 +2963,7 @@ static void ext4_unlockfs(struct super_b
                unlock_super(sb);
                jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
        }
+       return 0;
 }
 
 static int ext4_remount(struct super_block *sb, int *flags, char *data)

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