xfs: increase rename inode reservation

xfs_rename can update up to 5 inodes: src_dp, target_dp, src_ip, target_ip
and wip.  So we need to increase the inode reservation to match.
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_trans_resv.c

@@ -422,7 +422,7 @@ xfs_calc_itruncate_reservation_minlogsize(
 
 /*
  * In renaming a files we can modify:
- *    the four inodes involved: 4 * inode size
+ *    the five inodes involved: 5 * inode size
  *    the two directory btrees: 2 * (max depth + v2) * dir block size
  *    the two directory bmap btrees: 2 * max depth * block size
  * And the bmap_finish transaction can free dir and bmap blocks (two sets
@@ -437,7 +437,7 @@ xfs_calc_rename_reservation(
 	struct xfs_mount	*mp)
 {
 	return XFS_DQUOT_LOGRES(mp) +
-		max((xfs_calc_inode_res(mp, 4) +
+		max((xfs_calc_inode_res(mp, 5) +
 		     xfs_calc_buf_res(2 * XFS_DIROP_LOG_COUNT(mp),
 				      XFS_FSB_TO_B(mp, 1))),
 		    (xfs_calc_buf_res(7, mp->m_sb.sb_sectsize) +

fs/xfs/xfs_inode.c

@@ -2818,7 +2818,7 @@ xfs_rename(
 	 * Lock all the participating inodes. Depending upon whether
 	 * the target_name exists in the target directory, and
 	 * whether the target directory is the same as the source
-	 * directory, we can lock from 2 to 4 inodes.
+	 * directory, we can lock from 2 to 5 inodes.
 	 */
 	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);