xfs: use xfs_ilock_attr_map_shared in xfs_attr_list_int

We might not have read in the extent list at this point, so make sure we
take the ilock exclusively if we have to do so.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
index 2d174b128153..01db96f60cf0 100644
--- a/fs/xfs/xfs_attr_list.c
+++ b/fs/xfs/xfs_attr_list.c
@@ -507,17 +507,17 @@ xfs_attr_list_int(
 {
         int error;
         xfs_inode_t *dp = context->dp;
+        uint            lock_mode;
 
         XFS_STATS_INC(xs_attr_list);
 
         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
                 return EIO;
 
-        xfs_ilock(dp, XFS_ILOCK_SHARED);
-
         /*
          * Decide on what work routines to call based on the inode size.
          */
+        lock_mode = xfs_ilock_attr_map_shared(dp);
         if (!xfs_inode_hasattr(dp)) {
                 error = 0;
         } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
@@ -527,9 +527,7 @@ xfs_attr_list_int(
         } else {
                 error = xfs_attr_node_list(context);
         }
-
-        xfs_iunlock(dp, XFS_ILOCK_SHARED);
-
+        xfs_iunlock(dp, lock_mode);
         return error;
 }