[PATCH 21/28] xfs: Add parent pointers to xfs_cross_rename

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Allison Henderson <allison.henderson@xxxxxxxxxx>

Cross renames are handled separately from standard renames, and
need different handling to update the parent attributes correctly.

Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
 fs/xfs/xfs_inode.c |   49 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 16 deletions(-)


diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index cdbd7df64ff0..6626aa7486f1 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2749,27 +2749,31 @@ xfs_finish_rename(
  */
 STATIC int
 xfs_cross_rename(
-	struct xfs_trans	*tp,
-	struct xfs_inode	*dp1,
-	struct xfs_name		*name1,
-	struct xfs_inode	*ip1,
-	struct xfs_inode	*dp2,
-	struct xfs_name		*name2,
-	struct xfs_inode	*ip2,
-	int			spaceres)
+	struct xfs_trans		*tp,
+	struct xfs_inode		*dp1,
+	struct xfs_name			*name1,
+	struct xfs_inode		*ip1,
+	struct xfs_parent_defer		*ip1_pptr,
+	struct xfs_inode		*dp2,
+	struct xfs_name			*name2,
+	struct xfs_inode		*ip2,
+	struct xfs_parent_defer		*ip2_pptr,
+	int				spaceres)
 {
-	int		error = 0;
-	int		ip1_flags = 0;
-	int		ip2_flags = 0;
-	int		dp2_flags = 0;
+	struct xfs_mount		*mp = dp1->i_mount;
+	int				error = 0;
+	int				ip1_flags = 0;
+	int				ip2_flags = 0;
+	int				dp2_flags = 0;
+	int				new_diroffset, old_diroffset;
 
 	/* Swap inode number for dirent in first parent */
-	error = xfs_dir_replace(tp, dp1, name1, ip2->i_ino, spaceres, NULL);
+	error = xfs_dir_replace(tp, dp1, name1, ip2->i_ino, spaceres, &old_diroffset);
 	if (error)
 		goto out_trans_abort;
 
 	/* Swap inode number for dirent in second parent */
-	error = xfs_dir_replace(tp, dp2, name2, ip1->i_ino, spaceres, NULL);
+	error = xfs_dir_replace(tp, dp2, name2, ip1->i_ino, spaceres, &new_diroffset);
 	if (error)
 		goto out_trans_abort;
 
@@ -2830,6 +2834,18 @@ xfs_cross_rename(
 		}
 	}
 
+	if (xfs_has_parent(mp)) {
+		error = xfs_parent_defer_replace(tp, ip1_pptr, dp1,
+				old_diroffset, name2, dp2, new_diroffset, ip1);
+		if (error)
+			goto out_trans_abort;
+
+		error = xfs_parent_defer_replace(tp, ip2_pptr, dp2,
+				new_diroffset, name1, dp1, old_diroffset, ip2);
+		if (error)
+			goto out_trans_abort;
+	}
+
 	if (ip1_flags) {
 		xfs_trans_ichgtime(tp, ip1, ip1_flags);
 		xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
@@ -2844,6 +2860,7 @@ xfs_cross_rename(
 	}
 	xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 	xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
+
 	return xfs_finish_rename(tp);
 
 out_trans_abort:
@@ -3060,8 +3077,8 @@ xfs_rename(
 	/* RENAME_EXCHANGE is unique from here on. */
 	if (flags & RENAME_EXCHANGE) {
 		error = xfs_cross_rename(tp, src_dp, src_name, src_ip,
-					target_dp, target_name, target_ip,
-					spaceres);
+				src_ip_pptr, target_dp, target_name, target_ip,
+				tgt_ip_pptr, spaceres);
 		goto out_unlock;
 	}