xfs: fixup xfs_attr_get_ilocked

The comment mentioned the wrong lock.  Also add an ASSERT to assert
this locking precondition.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index ef8a1c75a467..de7b9bd30bec 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -114,12 +114,14 @@ xfs_inode_hasattr(
  * Overall external interface routines.
  *========================================================================*/
 
-/* Retrieve an extended attribute and its value.  Must have iolock. */
+/* Retrieve an extended attribute and its value.  Must have ilock. */
 int
 xfs_attr_get_ilocked(
         struct xfs_inode        *ip,
         struct xfs_da_args      *args)
 {
+        ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+
         if (!xfs_inode_hasattr(ip))
                 return -ENOATTR;
         else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)