1 files changed, 31 insertions, 14 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8f7e0be8ab1b..e5f06a5f045e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -51,7 +51,7 @@ struct proc_dir_entry *ext4_proc_root;
 
 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
                              unsigned long journal_devnum);
-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);
@@ -62,9 +62,9 @@ static const char *ext4_decode_error(struct super_block *sb, int errno,
                                      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,
@@ -978,8 +978,8 @@ static const struct super_operations ext4_sops = {
         .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,
@@ -2888,13 +2888,14 @@ static int ext4_load_journal(struct super_block *sb,
         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;
         if (buffer_write_io_error(sbh)) {
                 /*
                  * Oh, dear.  A previous attempt to write the
@@ -2918,14 +2919,19 @@ static void ext4_commit_super(struct super_block *sb,
         BUFFER_TRACE(sbh, "marking dirty");
         mark_buffer_dirty(sbh);
         if (sync) {
-                sync_dirty_buffer(sbh);
-                if (buffer_write_io_error(sbh)) {
+                error = sync_dirty_buffer(sbh);
+                if (error)
+                        return error;
+
+                error = buffer_write_io_error(sbh);
+                if (error) {
                         printk(KERN_ERR "EXT4-fs: I/O error while writing "
                                "superblock for %s.\n", sb->s_id);
                         clear_buffer_write_io_error(sbh);
                         set_buffer_uptodate(sbh);
                 }
         }
+        return error;
 }
 
 
@@ -3058,12 +3064,14 @@ static int ext4_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 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;
 
                 if (journal) {
                         /* Now we set up the journal barrier. */
@@ -3073,21 +3081,29 @@ static void ext4_write_super_lockfs(struct super_block *sb)
                          * We don't want to clear needs_recovery flag when we
                          * failed to flush the journal.
                          */
-                        if (jbd2_journal_flush(journal) < 0)
-                                return;
+                        error = jbd2_journal_flush(journal);
+                        if (error < 0)
+                                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 (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
                 lock_super(sb);
@@ -3097,6 +3113,7 @@ static void ext4_unlockfs(struct super_block *sb)
                 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)