ext4: online defrag is not supported for journaled files

Proper block swap for inodes with full journaling enabled is
truly non obvious task. In order to be on a safe side let's
explicitly disable it for now.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index df5cde5130c5..e2016f34b58f 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -1142,7 +1142,12 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
                         orig_inode->i_ino, donor_inode->i_ino);
                 return -EINVAL;
         }
-
+        /* TODO: This is non obvious task to swap blocks for inodes with full
+           jornaling enabled */
+        if (ext4_should_journal_data(orig_inode) ||
+            ext4_should_journal_data(donor_inode)) {
+                return -EINVAL;
+        }
         /* Protect orig and donor inodes against a truncate */
         mext_inode_double_lock(orig_inode, donor_inode);