xfs: handle cow fork in xfs_bmap_trace_exlist

commit c44a1f22626c153976289e1cd67bdcdfefc16e1f upstream.

By inspection, xfs_bmap_trace_exlist isn't handling cow forks,
and will trace the data fork instead.

Fix this by setting state appropriately if whichfork
== XFS_COW_FORK.

()___()
< @ @ >
 |   |
 {o_o}
  (|)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index cfd1fdd327eb..d4481d4383ee 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -518,7 +518,7 @@ void
 xfs_bmap_trace_exlist(
         xfs_inode_t     *ip,            /* incore inode pointer */
         xfs_extnum_t    cnt,            /* count of entries in the list */
-        int             whichfork,      /* data or attr fork */
+        int             whichfork,      /* data or attr or cow fork */
         unsigned long   caller_ip)
 {
         xfs_extnum_t    idx;            /* extent record index */
@@ -527,6 +527,8 @@ xfs_bmap_trace_exlist(
 
         if (whichfork == XFS_ATTR_FORK)
                 state |= BMAP_ATTRFORK;
+        else if (whichfork == XFS_COW_FORK)
+                state |= BMAP_COWFORK;
 
         ifp = XFS_IFORK_PTR(ip, whichfork);
         ASSERT(cnt == xfs_iext_count(ifp));