[PATCH] reiserfs: locking fix

From: Chris Mason <mason@suse.com>

Make sure to hold the BKL while ending a transaction in the error path or
reiserfs_prepare_write.

fs/reiserfs/inode.c

@@ -2258,8 +2258,11 @@ int reiserfs_prepare_write(struct file *f, struct page *page,
 	if (th->t_refcount > old_ref) {
 	    if (old_ref)
 	    	th->t_refcount--;
-	    else
+	    else {
+		reiserfs_write_lock(inode->i_sb);
 		reiserfs_end_persistent_transaction(th);
+		reiserfs_write_unlock(inode->i_sb);
+	    }
 	}
     }
     return ret;