xfs: Add parent pointers to rename

This patch removes the old parent pointer attribute during the rename
operation, and re-adds the updated parent pointer.  In the case of
xfs_cross_rename, we modify the routine not to roll the transaction just
yet.  We will do this after the parent pointer is added in the calling
xfs_rename function.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>

fs/xfs/libxfs/xfs_attr.c

@@ -923,7 +923,7 @@ xfs_attr_defer_add(
 }
 
 /* Sets an attribute for an inode as a deferred operation */
-static int
+int
 xfs_attr_defer_replace(
 	struct xfs_da_args	*args)
 {

fs/xfs/libxfs/xfs_attr.h

@@ -546,6 +546,7 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_defer_add(struct xfs_da_args *args);
 int xfs_attr_defer_remove(struct xfs_da_args *args);
+int xfs_attr_defer_replace(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
 int xfs_attr_set_iter(struct xfs_attr_intent *attr);
 int xfs_attr_remove_iter(struct xfs_attr_intent *attr);

fs/xfs/libxfs/xfs_parent.c

@@ -142,6 +142,37 @@ xfs_parent_defer_remove(
 	return xfs_attr_defer_remove(args);
 }
 
+
+int
+xfs_parent_defer_replace(
+	struct xfs_trans	*tp,
+	struct xfs_parent_defer	*new_parent,
+	struct xfs_inode	*old_dp,
+	xfs_dir2_dataptr_t	old_diroffset,
+	struct xfs_name		*parent_name,
+	struct xfs_inode	*new_dp,
+	xfs_dir2_dataptr_t	new_diroffset,
+	struct xfs_inode	*child)
+{
+	struct xfs_da_args	*args = &new_parent->args;
+
+	xfs_init_parent_name_rec(&new_parent->old_rec, old_dp, old_diroffset);
+	xfs_init_parent_name_rec(&new_parent->rec, new_dp, new_diroffset);
+	new_parent->args.name = (const uint8_t *)&new_parent->old_rec;
+	new_parent->args.namelen = sizeof(struct xfs_parent_name_rec);
+	new_parent->args.new_name = (const uint8_t *)&new_parent->rec;
+	new_parent->args.new_namelen = sizeof(struct xfs_parent_name_rec);
+	args->trans = tp;
+	args->dp = child;
+
+	ASSERT(parent_name != NULL);
+	new_parent->args.value = (void *)parent_name->name;
+	new_parent->args.valuelen = parent_name->len;
+
+	args->hashval = xfs_da_hashname(args->name, args->namelen);
+	return xfs_attr_defer_replace(args);
+}
+
 void
 xfs_parent_cancel(
 	xfs_mount_t		*mp,

fs/xfs/libxfs/xfs_parent.h

@@ -12,6 +12,7 @@
  */
 struct xfs_parent_defer {
 	struct xfs_parent_name_rec	rec;
+	struct xfs_parent_name_rec	old_rec;
 	struct xfs_da_args		args;
 };
 
@@ -27,6 +28,11 @@ int xfs_parent_init(xfs_mount_t *mp, struct xfs_parent_defer **parentp);
 int xfs_parent_defer_add(struct xfs_trans *tp, struct xfs_parent_defer *parent,
 			 struct xfs_inode *dp, struct xfs_name *parent_name,
 			 xfs_dir2_dataptr_t diroffset, struct xfs_inode *child);
+int xfs_parent_defer_replace(struct xfs_trans *tp,
+		struct xfs_parent_defer *new_parent, struct xfs_inode *old_dp,
+		xfs_dir2_dataptr_t old_diroffset, struct xfs_name *parent_name,
+		struct xfs_inode *new_ip, xfs_dir2_dataptr_t new_diroffset,
+		struct xfs_inode *child);
 int xfs_parent_defer_remove(struct xfs_trans *tp, struct xfs_inode *dp,
 			    struct xfs_parent_defer *parent,
 			    xfs_dir2_dataptr_t diroffset,

fs/xfs/libxfs/xfs_trans_space.h

@@ -91,8 +91,6 @@
 	 XFS_DQUOT_CLUSTER_SIZE_FSB)
 #define	XFS_QM_QINOCREATE_SPACE_RES(mp)	\
 	XFS_IALLOC_SPACE_RES(mp)
-#define	XFS_RENAME_SPACE_RES(mp,nl)	\
-	(XFS_DIRREMOVE_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
 #define XFS_IFREE_SPACE_RES(mp)		\
 	(xfs_has_finobt(mp) ? M_IGEO(mp)->inobt_maxlevels : 0)
 

fs/xfs/xfs_inode.c

@@ -2866,7 +2866,7 @@ xfs_rename_alloc_whiteout(
 	int			error;
 
 	error = xfs_create_tmpfile(mnt_userns, dp, S_IFCHR | WHITEOUT_MODE,
-				   false, &tmpfile);
+				   xfs_has_parent(dp->i_mount), &tmpfile);
 	if (error)
 		return error;
 
@@ -2892,6 +2892,31 @@ xfs_rename_alloc_whiteout(
 	return 0;
 }
 
+unsigned int
+xfs_rename_space_res(
+	struct xfs_mount	*mp,
+	struct xfs_name		*src_name,
+	struct xfs_parent_defer	*target_parent_ptr,
+	struct xfs_name		*target_name,
+	struct xfs_parent_defer	*new_parent_ptr,
+	struct xfs_inode	*wip)
+{
+	unsigned int		ret;
+
+	ret = XFS_DIRREMOVE_SPACE_RES(mp) +
+			XFS_DIRENTER_SPACE_RES(mp, target_name->len);
+
+	if (new_parent_ptr) {
+		if (wip)
+			ret += xfs_pptr_calc_space_res(mp, src_name->len);
+		ret += 2 * xfs_pptr_calc_space_res(mp, target_name->len);
+	}
+	if (target_parent_ptr)
+		ret += xfs_pptr_calc_space_res(mp, target_name->len);
+
+	return ret;
+}
+
 /*
  * xfs_rename
  */
@@ -2918,6 +2943,11 @@ xfs_rename(
 	int				spaceres;
 	bool				retried = false;
 	int				error, nospace_error = 0;
+	xfs_dir2_dataptr_t		new_diroffset;
+	xfs_dir2_dataptr_t		old_diroffset;
+	struct xfs_parent_defer		*new_parent_ptr = NULL;
+	struct xfs_parent_defer		*target_parent_ptr = NULL;
+	struct xfs_parent_defer		*wip_parent_ptr = NULL;
 
 	trace_xfs_rename(src_dp, target_dp, src_name, target_name);
 
@@ -2941,10 +2971,26 @@ xfs_rename(
 
 	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
 				inodes, &num_inodes);
+	if (xfs_has_parent(mp)) {
+		error = xfs_parent_init(mp, &new_parent_ptr);
+		if (error)
+			goto out_release_wip;
+		if (wip) {
+			error = xfs_parent_init(mp, &wip_parent_ptr);
+			if (error)
+				goto out_release_wip;
+		}
+		if (target_ip != NULL) {
+			error = xfs_parent_init(mp, &target_parent_ptr);
+			if (error)
+				goto out_release_wip;
+		}
+	}
 
 retry:
 	nospace_error = 0;
-	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
+	spaceres = xfs_rename_space_res(mp, src_name, target_parent_ptr,
+			target_name, new_parent_ptr, wip);
 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, spaceres, 0, 0, &tp);
 	if (error == -ENOSPC) {
 		nospace_error = error;
@@ -3116,7 +3162,7 @@ xfs_rename(
 		 * to account for the ".." reference from the new entry.
 		 */
 		error = xfs_dir_createname(tp, target_dp, target_name,
-					   src_ip->i_ino, spaceres, NULL);
+					   src_ip->i_ino, spaceres, &new_diroffset);
 		if (error)
 			goto out_trans_cancel;
 
@@ -3137,7 +3183,7 @@ xfs_rename(
 		 * name at the destination directory, remove it first.
 		 */
 		error = xfs_dir_replace(tp, target_dp, target_name,
-					src_ip->i_ino, spaceres, NULL);
+					src_ip->i_ino, spaceres, &new_diroffset);
 		if (error)
 			goto out_trans_cancel;
 
@@ -3210,14 +3256,38 @@ xfs_rename(
 	 */
 	if (wip)
 		error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
-					spaceres, NULL);
+					spaceres, &old_diroffset);
 	else
 		error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
-					   spaceres, NULL);
+					   spaceres, &old_diroffset);
 
 	if (error)
 		goto out_trans_cancel;
 
+	if (new_parent_ptr) {
+		if (wip) {
+			error = xfs_parent_defer_add(tp, wip_parent_ptr,
+						     src_dp, src_name,
+						     old_diroffset, wip);
+			if (error)
+				goto out_trans_cancel;
+		}
+
+		error = xfs_parent_defer_replace(tp, new_parent_ptr, src_dp,
+				old_diroffset, target_name, target_dp,
+				new_diroffset, src_ip);
+		if (error)
+			goto out_trans_cancel;
+	}
+
+	if (target_parent_ptr) {
+		error = xfs_parent_defer_remove(tp, target_dp,
+						target_parent_ptr,
+						new_diroffset, target_ip);
+		if (error)
+			goto out_trans_cancel;
+	}
+
 	xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
 	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
 	if (new_parent)
@@ -3232,6 +3302,13 @@ xfs_rename(
 out_unlock:
 	xfs_iunlock_after_rename(inodes, num_inodes);
 out_release_wip:
+	if (new_parent_ptr)
+		xfs_parent_cancel(mp, new_parent_ptr);
+	if (target_parent_ptr)
+		xfs_parent_cancel(mp, target_parent_ptr);
+	if (wip_parent_ptr)
+		xfs_parent_cancel(mp, wip_parent_ptr);
+
 	if (wip)
 		xfs_irele(wip);
 	if (error == -ENOSPC && nospace_error)