filesystem freeze: add error handling of write_super_lockfs/unlockfs

[linux-2.6-omap-h63xx.git] / fs / ext3 / super.c

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 5d047a030a73d0570a9ec992f549a4e4d2fb7c6a..b70d90e08a3c030855ba40731fc3578d2d58db2f 100644 (file)
--- 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)