hfs: push lock_super down

HFS uses 'lock_super()'/'unlock_super()' around 'hfs_mdb_commit()' in order
to serialize MDB (Master Directory Block) changes. Push it down to
'hfs_mdb_commit()' in order to simplify the code a bit.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/hfs/inode.c

@@ -645,11 +645,9 @@ static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
 	/* sync the superblock to buffers */
 	sb = inode->i_sb;
 	if (sb->s_dirt) {
-		lock_super(sb);
 		sb->s_dirt = 0;
 		if (!(sb->s_flags & MS_RDONLY))
 			hfs_mdb_commit(sb);
-		unlock_super(sb);
 	}
 	/* .. finally sync the buffers to disk */
 	err = sync_blockdev(sb->s_bdev);

fs/hfs/mdb.c

@@ -260,6 +260,7 @@ void hfs_mdb_commit(struct super_block *sb)
 {
 	struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
 
+	lock_super(sb);
 	if (test_and_clear_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags)) {
 		/* These parameters may have been modified, so write them back */
 		mdb->drLsMod = hfs_mtime();
@@ -317,6 +318,7 @@ void hfs_mdb_commit(struct super_block *sb)
 			size -= len;
 		}
 	}
+	unlock_super(sb);
 }
 
 void hfs_mdb_close(struct super_block *sb)

fs/hfs/super.c

@@ -50,21 +50,17 @@ MODULE_LICENSE("GPL");
  */
 static void hfs_write_super(struct super_block *sb)
 {
-	lock_super(sb);
 	sb->s_dirt = 0;
 
 	/* sync everything to the buffers */
 	if (!(sb->s_flags & MS_RDONLY))
 		hfs_mdb_commit(sb);
-	unlock_super(sb);
 }
 
 static int hfs_sync_fs(struct super_block *sb, int wait)
 {
-	lock_super(sb);
 	hfs_mdb_commit(sb);
 	sb->s_dirt = 0;
-	unlock_super(sb);
 
 	return 0;
 }