xfs: tone down writepage/releasepage WARN_ONs

I recently ran into the issue fixed by

  "xfs: kill buffers over failed write ranges properly"

which spams the log with lots of backtraces.  Make debugging any
issues like that easier by using WARN_ON_ONCE in the writeback code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 0479c32c5eb1..ce0c5ca0a8a3 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -975,7 +975,7 @@ xfs_vm_writepage(
          * Given that we do not allow direct reclaim to call us, we should
          * never be called while in a filesystem transaction.
          */
-        if (WARN_ON(current->flags & PF_FSTRANS))
+        if (WARN_ON_ONCE(current->flags & PF_FSTRANS))
                 goto redirty;
 
         /* Is this page beyond the end of the file? */
@@ -1188,9 +1188,9 @@ xfs_vm_releasepage(
 
         xfs_count_page_state(page, &delalloc, &unwritten);
 
-        if (WARN_ON(delalloc))
+        if (WARN_ON_ONCE(delalloc))
                 return 0;
-        if (WARN_ON(unwritten))
+        if (WARN_ON_ONCE(unwritten))
                 return 0;
 
         return try_to_free_buffers(page);