[net-next-2.6.git] / fs / xfs / xfs_rename.c

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_utils.h"
#include "xfs_trans_space.h"
#include "xfs_vnodeops.h"
#include "xfs_trace.h"


/*
 * Enter all inodes for a rename transaction into a sorted array.
 */
STATIC void
xfs_sort_for_rename(
	xfs_inode_t	*dp1,	/* in: old (source) directory inode */
	xfs_inode_t	*dp2,	/* in: new (target) directory inode */
	xfs_inode_t	*ip1,	/* in: inode of old entry */
	xfs_inode_t	*ip2,	/* in: inode of new entry, if it
				   already exists, NULL otherwise. */
	xfs_inode_t	**i_tab,/* out: array of inode returned, sorted */
	int		*num_inodes)  /* out: number of inodes in array */
{
	xfs_inode_t		*temp;
	int			i, j;

	/*
	 * i_tab contains a list of pointers to inodes.  We initialize
	 * the table here & we'll sort it.  We will then use it to
	 * order the acquisition of the inode locks.
	 *
	 * Note that the table may contain duplicates.  e.g., dp1 == dp2.
	 */
	i_tab[0] = dp1;
	i_tab[1] = dp2;
	i_tab[2] = ip1;
	if (ip2) {
		*num_inodes = 4;
		i_tab[3] = ip2;
	} else {
		*num_inodes = 3;
		i_tab[3] = NULL;
	}

	/*
	 * Sort the elements via bubble sort.  (Remember, there are at
	 * most 4 elements to sort, so this is adequate.)
	 */
	for (i = 0; i < *num_inodes; i++) {
		for (j = 1; j < *num_inodes; j++) {
			if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
				temp = i_tab[j];
				i_tab[j] = i_tab[j-1];
				i_tab[j-1] = temp;
			}
		}
	}
}

/*
 * xfs_rename
 */
int
xfs_rename(
	xfs_inode_t	*src_dp,
	struct xfs_name	*src_name,
	xfs_inode_t	*src_ip,
	xfs_inode_t	*target_dp,
	struct xfs_name	*target_name,
	xfs_inode_t	*target_ip)
{
	xfs_trans_t	*tp = NULL;
	xfs_mount_t	*mp = src_dp->i_mount;
	int		new_parent;		/* moving to a new dir */
	int		src_is_directory;	/* src_name is a directory */
	int		error;
	xfs_bmap_free_t free_list;
	xfs_fsblock_t   first_block;
	int		cancel_flags;
	int		committed;
	xfs_inode_t	*inodes[4];
	int		spaceres;
	int		num_inodes;

	trace_xfs_rename(src_dp, target_dp, src_name, target_name);

	new_parent = (src_dp != target_dp);
	src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);

	if (src_is_directory) {
		/*
		 * Check for link count overflow on target_dp
		 */
		if (target_ip == NULL && new_parent &&
		    target_dp->i_d.di_nlink >= XFS_MAXLINK) {
			error = XFS_ERROR(EMLINK);
			goto std_return;
		}
	}

	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
				inodes, &num_inodes);

	xfs_bmap_init(&free_list, &first_block);
	tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
	error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
			XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	if (error == ENOSPC) {
		spaceres = 0;
		error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
				XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	}
	if (error) {
		xfs_trans_cancel(tp, 0);
		goto std_return;
	}

	/*
	 * Attach the dquots to the inodes
	 */
	error = xfs_qm_vop_rename_dqattach(inodes);
	if (error) {
		xfs_trans_cancel(tp, cancel_flags);
		goto std_return;
	}

	/*
	 * 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.
	 */
	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);

	/*
	 * Join all the inodes to the transaction. From this point on,
	 * we can rely on either trans_commit or trans_cancel to unlock
	 * them.
	 */
	xfs_trans_ijoin_ref(tp, src_dp, XFS_ILOCK_EXCL);
	if (new_parent)
		xfs_trans_ijoin_ref(tp, target_dp, XFS_ILOCK_EXCL);
	xfs_trans_ijoin_ref(tp, src_ip, XFS_ILOCK_EXCL);
	if (target_ip)
		xfs_trans_ijoin_ref(tp, target_ip, XFS_ILOCK_EXCL);

	/*
	 * If we are using project inheritance, we only allow renames
	 * into our tree when the project IDs are the same; else the
	 * tree quota mechanism would be circumvented.
	 */
	if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
		     (target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
		error = XFS_ERROR(EXDEV);
		goto error_return;
	}

	/*
	 * Set up the target.
	 */
	if (target_ip == NULL) {
		/*
		 * If there's no space reservation, check the entry will
		 * fit before actually inserting it.
		 */
		error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
		if (error)
			goto error_return;
		/*
		 * If target does not exist and the rename crosses
		 * directories, adjust the target directory link count
		 * to account for the ".." reference from the new entry.
		 */
		error = xfs_dir_createname(tp, target_dp, target_name,
						src_ip->i_ino, &first_block,
						&free_list, spaceres);
		if (error == ENOSPC)
			goto error_return;
		if (error)
			goto abort_return;
		xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		if (new_parent && src_is_directory) {
			error = xfs_bumplink(tp, target_dp);
			if (error)
				goto abort_return;
		}
	} else { /* target_ip != NULL */
		/*
		 * If target exists and it's a directory, check that both
		 * target and source are directories and that target can be
		 * destroyed, or that neither is a directory.
		 */
		if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
			/*
			 * Make sure target dir is empty.
			 */
			if (!(xfs_dir_isempty(target_ip)) ||
			    (target_ip->i_d.di_nlink > 2)) {
				error = XFS_ERROR(EEXIST);
				goto error_return;
			}
		}

		/*
		 * Link the source inode under the target name.
		 * If the source inode is a directory and we are moving
		 * it across directories, its ".." entry will be
		 * inconsistent until we replace that down below.
		 *
		 * In case there is already an entry with the same
		 * name at the destination directory, remove it first.
		 */
		error = xfs_dir_replace(tp, target_dp, target_name,
					src_ip->i_ino,
					&first_block, &free_list, spaceres);
		if (error)
			goto abort_return;
		xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		/*
		 * Decrement the link count on the target since the target
		 * dir no longer points to it.
		 */
		error = xfs_droplink(tp, target_ip);
		if (error)
			goto abort_return;

		if (src_is_directory) {
			/*
			 * Drop the link from the old "." entry.
			 */
			error = xfs_droplink(tp, target_ip);
			if (error)
				goto abort_return;
		}
	} /* target_ip != NULL */

	/*
	 * Remove the source.
	 */
	if (new_parent && src_is_directory) {
		/*
		 * Rewrite the ".." entry to point to the new
		 * directory.
		 */
		error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
					target_dp->i_ino,
					&first_block, &free_list, spaceres);
		ASSERT(error != EEXIST);
		if (error)
			goto abort_return;
	}

	/*
	 * We always want to hit the ctime on the source inode.
	 *
	 * This isn't strictly required by the standards since the source
	 * inode isn't really being changed, but old unix file systems did
	 * it and some incremental backup programs won't work without it.
	 */
	xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);

	/*
	 * Adjust the link count on src_dp.  This is necessary when
	 * renaming a directory, either within one parent when
	 * the target existed, or across two parent directories.
	 */
	if (src_is_directory && (new_parent || target_ip != NULL)) {

		/*
		 * Decrement link count on src_directory since the
		 * entry that's moved no longer points to it.
		 */
		error = xfs_droplink(tp, src_dp);
		if (error)
			goto abort_return;
	}

	error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
					&first_block, &free_list, spaceres);
	if (error)
		goto abort_return;

	xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
	if (new_parent)
		xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);

	/*
	 * If this is a synchronous mount, make sure that the
	 * rename transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
		xfs_trans_set_sync(tp);
	}

	error = xfs_bmap_finish(&tp, &free_list, &committed);
	if (error) {
		xfs_bmap_cancel(&free_list);
		xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
				 XFS_TRANS_ABORT));
		goto std_return;
	}

	/*
	 * trans_commit will unlock src_ip, target_ip & decrement
	 * the vnode references.
	 */
	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

 abort_return:
	cancel_flags |= XFS_TRANS_ABORT;
 error_return:
	xfs_bmap_cancel(&free_list);
	xfs_trans_cancel(tp, cancel_flags);
 std_return:
	return error;
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a844f451	19	#include "xfs_fs.h"
1da177e4	20	#include "xfs_types.h"
1da177e4	21	#include "xfs_log.h"
a844f451	22	#include "xfs_inum.h"
1da177e4 LT	23	#include "xfs_trans.h"
1da177e4 LT	24	#include "xfs_sb.h"
da353b0d	25	#include "xfs_ag.h"
1da177e4	26	#include "xfs_dir2.h"
1da177e4	27	#include "xfs_mount.h"
a844f451	28	#include "xfs_da_btree.h"
1da177e4	29	#include "xfs_bmap_btree.h"
1da177e4	30	#include "xfs_dinode.h"
1da177e4	31	#include "xfs_inode.h"
a844f451	32	#include "xfs_inode_item.h"
1da177e4 LT	33	#include "xfs_bmap.h"
	34	#include "xfs_error.h"
	35	#include "xfs_quota.h"
1da177e4 LT	36	#include "xfs_utils.h"
1da177e4 LT	37	#include "xfs_trans_space.h"
a8272ce0	38	#include "xfs_vnodeops.h"
0b1b213f	39	#include "xfs_trace.h"
1da177e4 LT	40
1da177e4 LT	41
1da177e4	42	/*
cfa853e4	43	* Enter all inodes for a rename transaction into a sorted array.
1da177e4	44	*/
cfa853e4 CH	45	STATIC void
cfa853e4 CH	46	xfs_sort_for_rename(
556b8b16 BN	47	xfs_inode_t dp1, / in: old (source) directory inode */
	48	xfs_inode_t dp2, / in: new (target) directory inode */
	49	xfs_inode_t ip1, / in: inode of old entry */
cfa853e4	50	xfs_inode_t ip2, / in: inode of new entry, if it
1da177e4	51	already exists, NULL otherwise. */
556b8b16 BN	52	xfs_inode_t *i_tab,/ out: array of inode returned, sorted */
556b8b16 BN	53	int num_inodes) / out: number of inodes in array */
1da177e4	54	{
556b8b16	55	xfs_inode_t *temp;
1da177e4	56	int i, j;
1da177e4 LT	57
	58	/*
	59	* i_tab contains a list of pointers to inodes. We initialize
	60	* the table here & we'll sort it. We will then use it to
	61	* order the acquisition of the inode locks.
	62	*
	63	* Note that the table may contain duplicates. e.g., dp1 == dp2.
	64	*/
	65	i_tab[0] = dp1;
	66	i_tab[1] = dp2;
	67	i_tab[2] = ip1;
cfa853e4	68	if (ip2) {
1da177e4 LT	69	*num_inodes = 4;
1da177e4 LT	70	i_tab[3] = ip2;
cfa853e4 CH	71	} else {
	72	*num_inodes = 3;
	73	i_tab[3] = NULL;
1da177e4 LT	74	}
	75
	76	/*
	77	* Sort the elements via bubble sort. (Remember, there are at
	78	* most 4 elements to sort, so this is adequate.)
	79	*/
cfa853e4 CH	80	for (i = 0; i < *num_inodes; i++) {
cfa853e4 CH	81	for (j = 1; j < *num_inodes; j++) {
1da177e4 LT	82	if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
	83	temp = i_tab[j];
	84	i_tab[j] = i_tab[j-1];
	85	i_tab[j-1] = temp;
	86	}
	87	}
	88	}
1da177e4 LT	89	}
1da177e4 LT	90
1da177e4 LT	91	/*
	92	* xfs_rename
	93	*/
	94	int
	95	xfs_rename(
993386c1	96	xfs_inode_t *src_dp,
556b8b16 BN	97	struct xfs_name *src_name,
556b8b16 BN	98	xfs_inode_t *src_ip,
3937be5b	99	xfs_inode_t *target_dp,
cfa853e4 CH	100	struct xfs_name *target_name,
cfa853e4 CH	101	xfs_inode_t *target_ip)
1da177e4	102	{
cfa853e4	103	xfs_trans_t *tp = NULL;
993386c1	104	xfs_mount_t *mp = src_dp->i_mount;
1da177e4 LT	105	int new_parent; /* moving to a new dir */
	106	int src_is_directory; /* src_name is a directory */
	107	int error;
	108	xfs_bmap_free_t free_list;
	109	xfs_fsblock_t first_block;
	110	int cancel_flags;
	111	int committed;
	112	xfs_inode_t *inodes[4];
1da177e4	113	int spaceres;
1da177e4	114	int num_inodes;
1da177e4	115
cca28fb8	116	trace_xfs_rename(src_dp, target_dp, src_name, target_name);
1da177e4	117
cfa853e4 CH	118	new_parent = (src_dp != target_dp);
cfa853e4 CH	119	src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
1da177e4	120
cfa853e4	121	if (src_is_directory) {
1da177e4 LT	122	/*
	123	* Check for link count overflow on target_dp
	124	*/
cfa853e4	125	if (target_ip == NULL && new_parent &&
1da177e4	126	target_dp->i_d.di_nlink >= XFS_MAXLINK) {
1da177e4	127	error = XFS_ERROR(EMLINK);
cfa853e4	128	goto std_return;
1da177e4 LT	129	}
	130	}
	131
cfa853e4 CH	132	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
cfa853e4 CH	133	inodes, &num_inodes);
1da177e4	134
9d87c319	135	xfs_bmap_init(&free_list, &first_block);
1da177e4 LT	136	tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
1da177e4 LT	137	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
556b8b16	138	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
1da177e4 LT	139	error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
	140	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	141	if (error == ENOSPC) {
	142	spaceres = 0;
	143	error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
	144	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	145	}
	146	if (error) {
1da177e4	147	xfs_trans_cancel(tp, 0);
1ac74e01	148	goto std_return;
1da177e4 LT	149	}
	150
	151	/*
	152	* Attach the dquots to the inodes
	153	*/
7d095257 CH	154	error = xfs_qm_vop_rename_dqattach(inodes);
7d095257 CH	155	if (error) {
1da177e4	156	xfs_trans_cancel(tp, cancel_flags);
1ac74e01	157	goto std_return;
1da177e4 LT	158	}
	159
	160	/*
cfa853e4 CH	161	* Lock all the participating inodes. Depending upon whether
	162	* the target_name exists in the target directory, and
	163	* whether the target directory is the same as the source
	164	* directory, we can lock from 2 to 4 inodes.
	165	*/
	166	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
	167
1da177e4 LT	168	/*
	169	* Join all the inodes to the transaction. From this point on,
	170	* we can rely on either trans_commit or trans_cancel to unlock
898621d5	171	* them.
1da177e4	172	*/
898621d5 CH	173	xfs_trans_ijoin_ref(tp, src_dp, XFS_ILOCK_EXCL);
	174	if (new_parent)
	175	xfs_trans_ijoin_ref(tp, target_dp, XFS_ILOCK_EXCL);
	176	xfs_trans_ijoin_ref(tp, src_ip, XFS_ILOCK_EXCL);
	177	if (target_ip)
	178	xfs_trans_ijoin_ref(tp, target_ip, XFS_ILOCK_EXCL);
1da177e4	179
2175dd95 CH	180	/*
	181	* If we are using project inheritance, we only allow renames
	182	* into our tree when the project IDs are the same; else the
	183	* tree quota mechanism would be circumvented.
	184	*/
	185	if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
	186	(target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
	187	error = XFS_ERROR(EXDEV);
	188	goto error_return;
	189	}
	190
1da177e4 LT	191	/*
	192	* Set up the target.
	193	*/
	194	if (target_ip == NULL) {
	195	/*
	196	* If there's no space reservation, check the entry will
	197	* fit before actually inserting it.
	198	*/
556b8b16 BN	199	error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
556b8b16 BN	200	if (error)
1da177e4	201	goto error_return;
1da177e4 LT	202	/*
	203	* If target does not exist and the rename crosses
	204	* directories, adjust the target directory link count
	205	* to account for the ".." reference from the new entry.
	206	*/
f6c2d1fa	207	error = xfs_dir_createname(tp, target_dp, target_name,
556b8b16 BN	208	src_ip->i_ino, &first_block,
556b8b16 BN	209	&free_list, spaceres);
f6c2d1fa	210	if (error == ENOSPC)
1da177e4	211	goto error_return;
f6c2d1fa	212	if (error)
1da177e4	213	goto abort_return;
1da177e4 LT	214	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	215
	216	if (new_parent && src_is_directory) {
	217	error = xfs_bumplink(tp, target_dp);
f6c2d1fa	218	if (error)
1da177e4	219	goto abort_return;
1da177e4 LT	220	}
1da177e4 LT	221	} else { /* target_ip != NULL */
1da177e4 LT	222	/*
	223	* If target exists and it's a directory, check that both
	224	* target and source are directories and that target can be
	225	* destroyed, or that neither is a directory.
	226	*/
	227	if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
	228	/*
	229	* Make sure target dir is empty.
	230	*/
f6c2d1fa	231	if (!(xfs_dir_isempty(target_ip)) \|\|
1da177e4 LT	232	(target_ip->i_d.di_nlink > 2)) {
1da177e4 LT	233	error = XFS_ERROR(EEXIST);
1da177e4 LT	234	goto error_return;
	235	}
	236	}
	237
	238	/*
	239	* Link the source inode under the target name.
	240	* If the source inode is a directory and we are moving
	241	* it across directories, its ".." entry will be
	242	* inconsistent until we replace that down below.
	243	*
	244	* In case there is already an entry with the same
	245	* name at the destination directory, remove it first.
	246	*/
f6c2d1fa	247	error = xfs_dir_replace(tp, target_dp, target_name,
556b8b16	248	src_ip->i_ino,
f6c2d1fa NS	249	&first_block, &free_list, spaceres);
f6c2d1fa NS	250	if (error)
1da177e4	251	goto abort_return;
1da177e4 LT	252	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	253
	254	/*
	255	* Decrement the link count on the target since the target
	256	* dir no longer points to it.
	257	*/
	258	error = xfs_droplink(tp, target_ip);
f6c2d1fa	259	if (error)
1da177e4	260	goto abort_return;
1da177e4 LT	261
	262	if (src_is_directory) {
	263	/*
	264	* Drop the link from the old "." entry.
	265	*/
	266	error = xfs_droplink(tp, target_ip);
f6c2d1fa	267	if (error)
1da177e4	268	goto abort_return;
1da177e4	269	}
1da177e4 LT	270	} /* target_ip != NULL */
	271
	272	/*
	273	* Remove the source.
	274	*/
	275	if (new_parent && src_is_directory) {
1da177e4 LT	276	/*
	277	* Rewrite the ".." entry to point to the new
	278	* directory.
	279	*/
556b8b16 BN	280	error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
556b8b16 BN	281	target_dp->i_ino,
f6c2d1fa	282	&first_block, &free_list, spaceres);
1da177e4	283	ASSERT(error != EEXIST);
f6c2d1fa	284	if (error)
1da177e4	285	goto abort_return;
1da177e4 LT	286	}
1da177e4 LT	287
8f8670bb CH	288	/*
	289	* We always want to hit the ctime on the source inode.
	290	*
	291	* This isn't strictly required by the standards since the source
	292	* inode isn't really being changed, but old unix file systems did
	293	* it and some incremental backup programs won't work without it.
	294	*/
	295	xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
	296
1da177e4 LT	297	/*
	298	* Adjust the link count on src_dp. This is necessary when
	299	* renaming a directory, either within one parent when
	300	* the target existed, or across two parent directories.
	301	*/
	302	if (src_is_directory && (new_parent \|\| target_ip != NULL)) {
	303
	304	/*
	305	* Decrement link count on src_directory since the
	306	* entry that's moved no longer points to it.
	307	*/
	308	error = xfs_droplink(tp, src_dp);
f6c2d1fa	309	if (error)
1da177e4	310	goto abort_return;
1da177e4 LT	311	}
1da177e4 LT	312
556b8b16 BN	313	error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
556b8b16 BN	314	&first_block, &free_list, spaceres);
f6c2d1fa	315	if (error)
1da177e4	316	goto abort_return;
1da177e4	317
26c52951	318	xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
1da177e4	319	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
26c52951	320	if (new_parent)
1da177e4	321	xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
1da177e4	322
1da177e4 LT	323	/*
	324	* If this is a synchronous mount, make sure that the
	325	* rename transaction goes to disk before returning to
	326	* the user.
	327	*/
	328	if (mp->m_flags & (XFS_MOUNT_WSYNC\|XFS_MOUNT_DIRSYNC)) {
	329	xfs_trans_set_sync(tp);
	330	}
	331
f7c99b6f	332	error = xfs_bmap_finish(&tp, &free_list, &committed);
1da177e4 LT	333	if (error) {
	334	xfs_bmap_cancel(&free_list);
	335	xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES \|
	336	XFS_TRANS_ABORT));
1da177e4 LT	337	goto std_return;
	338	}
	339
	340	/*
	341	* trans_commit will unlock src_ip, target_ip & decrement
	342	* the vnode references.
	343	*/
288699fe	344	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1da177e4 LT	345
	346	abort_return:
	347	cancel_flags \|= XFS_TRANS_ABORT;
1da177e4 LT	348	error_return:
	349	xfs_bmap_cancel(&free_list);
	350	xfs_trans_cancel(tp, cancel_flags);
288699fe CH	351	std_return:
288699fe CH	352	return error;
1da177e4	353	}