xfs: add tracing to xfs_swap_extents

To be able to diagnose whether the swap extents function is
detecting compatible inode data fork configurations for swapping
extents, add tracing points to the code to allow us to see the
format of the inode forks before and after the swap.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dfrag.c b/fs/xfs/xfs_dfrag.c
index 84ca1cf16a1e..f25e54027d10 100644
--- a/fs/xfs/xfs_dfrag.c
+++ b/fs/xfs/xfs_dfrag.c
@@ -254,6 +254,9 @@ xfs_swap_extents(
                 goto out_unlock;
         }
 
+        trace_xfs_swap_extent_before(ip, 0);
+        trace_xfs_swap_extent_before(tip, 1);
+
         /* check inode formats now that data is flushed */
         error = xfs_swap_extents_check_format(ip, tip);
         if (error) {
@@ -421,6 +424,8 @@ xfs_swap_extents(
 
         error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
 
+        trace_xfs_swap_extent_after(ip, 0);
+        trace_xfs_swap_extent_after(tip, 1);
 out:
         kmem_free(tempifp);
         return error;