[linux.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_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.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"


/*
 * 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;

	xfs_itrace_entry(src_dp);
	xfs_itrace_entry(target_dp);

	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) ||
	    DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
		error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
					src_dp, DM_RIGHT_NULL,
					target_dp, DM_RIGHT_NULL,
					src_name->name, target_name->name,
					0, 0, 0);
		if (error)
			return error;
	}
	/* Return through std_return after this point. */

	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.  Note that we need to add a vnode reference to the
	 * directories since trans_commit & trans_cancel will decrement
	 * them when they unlock the inodes.  Also, we need to be careful
	 * not to add an inode to the transaction more than once.
	 */
	IHOLD(src_dp);
	xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);

	if (new_parent) {
		IHOLD(target_dp);
		xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
	}

	IHOLD(src_ip);
	xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);

	if (target_ip) {
		IHOLD(target_ip);
		xfs_trans_ijoin(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.
	 */
	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

	/* Fall through to std_return with error = 0 or errno from
	 * xfs_trans_commit	 */
std_return:
	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) ||
	    DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
		(void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
					src_dp, DM_RIGHT_NULL,
					target_dp, DM_RIGHT_NULL,
					src_name->name, target_name->name,
					0, error, 0);
	}
	return error;

 abort_return:
	cancel_flags |= XFS_TRANS_ABORT;
	/* FALLTHROUGH */
 error_return:
	xfs_bmap_cancel(&free_list);
	xfs_trans_cancel(tp, cancel_flags);
	goto std_return;
}
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 LT	26	#include "xfs_dir2.h"
	27	#include "xfs_dmapi.h"
	28	#include "xfs_mount.h"
a844f451	29	#include "xfs_da_btree.h"
1da177e4	30	#include "xfs_bmap_btree.h"
1da177e4	31	#include "xfs_dir2_sf.h"
a844f451	32	#include "xfs_attr_sf.h"
1da177e4	33	#include "xfs_dinode.h"
1da177e4	34	#include "xfs_inode.h"
a844f451	35	#include "xfs_inode_item.h"
1da177e4 LT	36	#include "xfs_bmap.h"
	37	#include "xfs_error.h"
	38	#include "xfs_quota.h"
1da177e4 LT	39	#include "xfs_utils.h"
1da177e4 LT	40	#include "xfs_trans_space.h"
a8272ce0	41	#include "xfs_vnodeops.h"
1da177e4 LT	42
1da177e4 LT	43
1da177e4	44	/*
cfa853e4	45	* Enter all inodes for a rename transaction into a sorted array.
1da177e4	46	*/
cfa853e4 CH	47	STATIC void
cfa853e4 CH	48	xfs_sort_for_rename(
556b8b16 BN	49	xfs_inode_t dp1, / in: old (source) directory inode */
	50	xfs_inode_t dp2, / in: new (target) directory inode */
	51	xfs_inode_t ip1, / in: inode of old entry */
cfa853e4	52	xfs_inode_t ip2, / in: inode of new entry, if it
1da177e4	53	already exists, NULL otherwise. */
556b8b16 BN	54	xfs_inode_t *i_tab,/ out: array of inode returned, sorted */
556b8b16 BN	55	int num_inodes) / out: number of inodes in array */
1da177e4	56	{
556b8b16	57	xfs_inode_t *temp;
1da177e4	58	int i, j;
1da177e4 LT	59
	60	/*
	61	* i_tab contains a list of pointers to inodes. We initialize
	62	* the table here & we'll sort it. We will then use it to
	63	* order the acquisition of the inode locks.
	64	*
	65	* Note that the table may contain duplicates. e.g., dp1 == dp2.
	66	*/
	67	i_tab[0] = dp1;
	68	i_tab[1] = dp2;
	69	i_tab[2] = ip1;
cfa853e4	70	if (ip2) {
1da177e4 LT	71	*num_inodes = 4;
1da177e4 LT	72	i_tab[3] = ip2;
cfa853e4 CH	73	} else {
	74	*num_inodes = 3;
	75	i_tab[3] = NULL;
1da177e4 LT	76	}
	77
	78	/*
	79	* Sort the elements via bubble sort. (Remember, there are at
	80	* most 4 elements to sort, so this is adequate.)
	81	*/
cfa853e4 CH	82	for (i = 0; i < *num_inodes; i++) {
cfa853e4 CH	83	for (j = 1; j < *num_inodes; j++) {
1da177e4 LT	84	if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
	85	temp = i_tab[j];
	86	i_tab[j] = i_tab[j-1];
	87	i_tab[j-1] = temp;
	88	}
	89	}
	90	}
1da177e4 LT	91	}
1da177e4 LT	92
1da177e4 LT	93	/*
	94	* xfs_rename
	95	*/
	96	int
	97	xfs_rename(
993386c1	98	xfs_inode_t *src_dp,
556b8b16 BN	99	struct xfs_name *src_name,
556b8b16 BN	100	xfs_inode_t *src_ip,
3937be5b	101	xfs_inode_t *target_dp,
cfa853e4 CH	102	struct xfs_name *target_name,
cfa853e4 CH	103	xfs_inode_t *target_ip)
1da177e4	104	{
cfa853e4	105	xfs_trans_t *tp = NULL;
993386c1	106	xfs_mount_t *mp = src_dp->i_mount;
1da177e4 LT	107	int new_parent; /* moving to a new dir */
	108	int src_is_directory; /* src_name is a directory */
	109	int error;
	110	xfs_bmap_free_t free_list;
	111	xfs_fsblock_t first_block;
	112	int cancel_flags;
	113	int committed;
	114	xfs_inode_t *inodes[4];
1da177e4	115	int spaceres;
1da177e4	116	int num_inodes;
1da177e4	117
cf441eeb	118	xfs_itrace_entry(src_dp);
3937be5b	119	xfs_itrace_entry(target_dp);
1da177e4	120
eb9df39d CH	121	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) \|\|
eb9df39d CH	122	DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
1da177e4	123	error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
bc4ac74a CH	124	src_dp, DM_RIGHT_NULL,
bc4ac74a CH	125	target_dp, DM_RIGHT_NULL,
556b8b16	126	src_name->name, target_name->name,
1da177e4	127	0, 0, 0);
cfa853e4	128	if (error)
1da177e4	129	return error;
1da177e4 LT	130	}
	131	/* Return through std_return after this point. */
	132
cfa853e4 CH	133	new_parent = (src_dp != target_dp);
cfa853e4 CH	134	src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
1da177e4	135
cfa853e4	136	if (src_is_directory) {
1da177e4 LT	137	/*
	138	* Check for link count overflow on target_dp
	139	*/
cfa853e4	140	if (target_ip == NULL && new_parent &&
1da177e4	141	target_dp->i_d.di_nlink >= XFS_MAXLINK) {
1da177e4	142	error = XFS_ERROR(EMLINK);
cfa853e4	143	goto std_return;
1da177e4 LT	144	}
	145	}
	146
cfa853e4 CH	147	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
cfa853e4 CH	148	inodes, &num_inodes);
1da177e4	149
9d87c319	150	xfs_bmap_init(&free_list, &first_block);
1da177e4 LT	151	tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
1da177e4 LT	152	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
556b8b16	153	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
1da177e4 LT	154	error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
	155	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	156	if (error == ENOSPC) {
	157	spaceres = 0;
	158	error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
	159	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	160	}
	161	if (error) {
1da177e4	162	xfs_trans_cancel(tp, 0);
1ac74e01	163	goto std_return;
1da177e4 LT	164	}
	165
	166	/*
	167	* Attach the dquots to the inodes
	168	*/
7d095257 CH	169	error = xfs_qm_vop_rename_dqattach(inodes);
7d095257 CH	170	if (error) {
1da177e4	171	xfs_trans_cancel(tp, cancel_flags);
1ac74e01	172	goto std_return;
1da177e4 LT	173	}
	174
	175	/*
cfa853e4 CH	176	* Lock all the participating inodes. Depending upon whether
	177	* the target_name exists in the target directory, and
	178	* whether the target directory is the same as the source
	179	* directory, we can lock from 2 to 4 inodes.
	180	*/
	181	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
	182
1da177e4 LT	183	/*
	184	* Join all the inodes to the transaction. From this point on,
	185	* we can rely on either trans_commit or trans_cancel to unlock
	186	* them. Note that we need to add a vnode reference to the
	187	* directories since trans_commit & trans_cancel will decrement
	188	* them when they unlock the inodes. Also, we need to be careful
	189	* not to add an inode to the transaction more than once.
	190	*/
3937be5b	191	IHOLD(src_dp);
1da177e4	192	xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
1ac74e01	193
1da177e4	194	if (new_parent) {
3937be5b	195	IHOLD(target_dp);
1da177e4 LT	196	xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
1da177e4 LT	197	}
1ac74e01 CH	198
	199	IHOLD(src_ip);
	200	xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
	201
	202	if (target_ip) {
	203	IHOLD(target_ip);
1da177e4 LT	204	xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
	205	}
	206
2175dd95 CH	207	/*
	208	* If we are using project inheritance, we only allow renames
	209	* into our tree when the project IDs are the same; else the
	210	* tree quota mechanism would be circumvented.
	211	*/
	212	if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
	213	(target_dp->i_d.di_projid != src_ip->i_d.di_projid))) {
	214	error = XFS_ERROR(EXDEV);
	215	goto error_return;
	216	}
	217
1da177e4 LT	218	/*
	219	* Set up the target.
	220	*/
	221	if (target_ip == NULL) {
	222	/*
	223	* If there's no space reservation, check the entry will
	224	* fit before actually inserting it.
	225	*/
556b8b16 BN	226	error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
556b8b16 BN	227	if (error)
1da177e4	228	goto error_return;
1da177e4 LT	229	/*
	230	* If target does not exist and the rename crosses
	231	* directories, adjust the target directory link count
	232	* to account for the ".." reference from the new entry.
	233	*/
f6c2d1fa	234	error = xfs_dir_createname(tp, target_dp, target_name,
556b8b16 BN	235	src_ip->i_ino, &first_block,
556b8b16 BN	236	&free_list, spaceres);
f6c2d1fa	237	if (error == ENOSPC)
1da177e4	238	goto error_return;
f6c2d1fa	239	if (error)
1da177e4	240	goto abort_return;
1da177e4 LT	241	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	242
	243	if (new_parent && src_is_directory) {
	244	error = xfs_bumplink(tp, target_dp);
f6c2d1fa	245	if (error)
1da177e4	246	goto abort_return;
1da177e4 LT	247	}
1da177e4 LT	248	} else { /* target_ip != NULL */
1da177e4 LT	249	/*
	250	* If target exists and it's a directory, check that both
	251	* target and source are directories and that target can be
	252	* destroyed, or that neither is a directory.
	253	*/
	254	if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
	255	/*
	256	* Make sure target dir is empty.
	257	*/
f6c2d1fa	258	if (!(xfs_dir_isempty(target_ip)) \|\|
1da177e4 LT	259	(target_ip->i_d.di_nlink > 2)) {
1da177e4 LT	260	error = XFS_ERROR(EEXIST);
1da177e4 LT	261	goto error_return;
	262	}
	263	}
	264
	265	/*
	266	* Link the source inode under the target name.
	267	* If the source inode is a directory and we are moving
	268	* it across directories, its ".." entry will be
	269	* inconsistent until we replace that down below.
	270	*
	271	* In case there is already an entry with the same
	272	* name at the destination directory, remove it first.
	273	*/
f6c2d1fa	274	error = xfs_dir_replace(tp, target_dp, target_name,
556b8b16	275	src_ip->i_ino,
f6c2d1fa NS	276	&first_block, &free_list, spaceres);
f6c2d1fa NS	277	if (error)
1da177e4	278	goto abort_return;
1da177e4 LT	279	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	280
	281	/*
	282	* Decrement the link count on the target since the target
	283	* dir no longer points to it.
	284	*/
	285	error = xfs_droplink(tp, target_ip);
f6c2d1fa	286	if (error)
1da177e4	287	goto abort_return;
1da177e4 LT	288
	289	if (src_is_directory) {
	290	/*
	291	* Drop the link from the old "." entry.
	292	*/
	293	error = xfs_droplink(tp, target_ip);
f6c2d1fa	294	if (error)
1da177e4	295	goto abort_return;
1da177e4	296	}
1da177e4 LT	297	} /* target_ip != NULL */
	298
	299	/*
	300	* Remove the source.
	301	*/
	302	if (new_parent && src_is_directory) {
1da177e4 LT	303	/*
	304	* Rewrite the ".." entry to point to the new
	305	* directory.
	306	*/
556b8b16 BN	307	error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
556b8b16 BN	308	target_dp->i_ino,
f6c2d1fa	309	&first_block, &free_list, spaceres);
1da177e4	310	ASSERT(error != EEXIST);
f6c2d1fa	311	if (error)
1da177e4	312	goto abort_return;
1da177e4 LT	313	}
1da177e4 LT	314
8f8670bb CH	315	/*
	316	* We always want to hit the ctime on the source inode.
	317	*
	318	* This isn't strictly required by the standards since the source
	319	* inode isn't really being changed, but old unix file systems did
	320	* it and some incremental backup programs won't work without it.
	321	*/
	322	xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
	323
1da177e4 LT	324	/*
	325	* Adjust the link count on src_dp. This is necessary when
	326	* renaming a directory, either within one parent when
	327	* the target existed, or across two parent directories.
	328	*/
	329	if (src_is_directory && (new_parent \|\| target_ip != NULL)) {
	330
	331	/*
	332	* Decrement link count on src_directory since the
	333	* entry that's moved no longer points to it.
	334	*/
	335	error = xfs_droplink(tp, src_dp);
f6c2d1fa	336	if (error)
1da177e4	337	goto abort_return;
1da177e4 LT	338	}
1da177e4 LT	339
556b8b16 BN	340	error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
556b8b16 BN	341	&first_block, &free_list, spaceres);
f6c2d1fa	342	if (error)
1da177e4	343	goto abort_return;
1da177e4	344
26c52951	345	xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
1da177e4	346	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
26c52951	347	if (new_parent)
1da177e4	348	xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
1da177e4	349
1da177e4 LT	350	/*
	351	* If this is a synchronous mount, make sure that the
	352	* rename transaction goes to disk before returning to
	353	* the user.
	354	*/
	355	if (mp->m_flags & (XFS_MOUNT_WSYNC\|XFS_MOUNT_DIRSYNC)) {
	356	xfs_trans_set_sync(tp);
	357	}
	358
f7c99b6f	359	error = xfs_bmap_finish(&tp, &free_list, &committed);
1da177e4 LT	360	if (error) {
	361	xfs_bmap_cancel(&free_list);
	362	xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES \|
	363	XFS_TRANS_ABORT));
1da177e4 LT	364	goto std_return;
	365	}
	366
	367	/*
	368	* trans_commit will unlock src_ip, target_ip & decrement
	369	* the vnode references.
	370	*/
1c72bf90	371	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1da177e4 LT	372
	373	/* Fall through to std_return with error = 0 or errno from
	374	* xfs_trans_commit */
	375	std_return:
eb9df39d CH	376	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) \|\|
eb9df39d CH	377	DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
1da177e4	378	(void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
bc4ac74a CH	379	src_dp, DM_RIGHT_NULL,
bc4ac74a CH	380	target_dp, DM_RIGHT_NULL,
556b8b16	381	src_name->name, target_name->name,
1da177e4 LT	382	0, error, 0);
	383	}
	384	return error;
	385
	386	abort_return:
	387	cancel_flags \|= XFS_TRANS_ABORT;
	388	/* FALLTHROUGH */
	389	error_return:
	390	xfs_bmap_cancel(&free_list);
	391	xfs_trans_cancel(tp, cancel_flags);
	392	goto std_return;
1da177e4	393	}