[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_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"


/*
 * Given an array of up to 4 inode pointers, unlock the pointed to inodes.
 * If there are fewer than 4 entries in the array, the empty entries will
 * be at the end and will have NULL pointers in them.
 */
STATIC void
xfs_rename_unlock4(
	xfs_inode_t	**i_tab,
	uint		lock_mode)
{
	int	i;

	xfs_iunlock(i_tab[0], lock_mode);
	for (i = 1; i < 4; i++) {
		if (i_tab[i] == NULL)
			break;

		/*
		 * Watch out for duplicate entries in the table.
		 */
		if (i_tab[i] != i_tab[i-1])
			xfs_iunlock(i_tab[i], lock_mode);
	}
}

/*
 * 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
	 */
	if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
		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);

	/*
	 * 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);
		xfs_rename_unlock4(inodes, XFS_ILOCK_EXCL);
		xfs_trans_cancel(tp, cancel_flags);
		goto std_return;
	}

	/*
	 * 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);
	}

	/*
	 * 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
	43
	44	/*
	45	* Given an array of up to 4 inode pointers, unlock the pointed to inodes.
	46	* If there are fewer than 4 entries in the array, the empty entries will
	47	* be at the end and will have NULL pointers in them.
	48	*/
	49	STATIC void
	50	xfs_rename_unlock4(
	51	xfs_inode_t **i_tab,
	52	uint lock_mode)
	53	{
	54	int i;
	55
	56	xfs_iunlock(i_tab[0], lock_mode);
	57	for (i = 1; i < 4; i++) {
cfa853e4	58	if (i_tab[i] == NULL)
1da177e4	59	break;
cfa853e4	60
1da177e4 LT	61	/*
	62	* Watch out for duplicate entries in the table.
	63	*/
cfa853e4	64	if (i_tab[i] != i_tab[i-1])
1da177e4	65	xfs_iunlock(i_tab[i], lock_mode);
1da177e4 LT	66	}
	67	}
	68
1da177e4	69	/*
cfa853e4	70	* Enter all inodes for a rename transaction into a sorted array.
1da177e4	71	*/
cfa853e4 CH	72	STATIC void
cfa853e4 CH	73	xfs_sort_for_rename(
556b8b16 BN	74	xfs_inode_t dp1, / in: old (source) directory inode */
	75	xfs_inode_t dp2, / in: new (target) directory inode */
	76	xfs_inode_t ip1, / in: inode of old entry */
cfa853e4	77	xfs_inode_t ip2, / in: inode of new entry, if it
1da177e4	78	already exists, NULL otherwise. */
556b8b16 BN	79	xfs_inode_t *i_tab,/ out: array of inode returned, sorted */
556b8b16 BN	80	int num_inodes) / out: number of inodes in array */
1da177e4	81	{
556b8b16	82	xfs_inode_t *temp;
1da177e4	83	int i, j;
1da177e4 LT	84
	85	/*
	86	* i_tab contains a list of pointers to inodes. We initialize
	87	* the table here & we'll sort it. We will then use it to
	88	* order the acquisition of the inode locks.
	89	*
	90	* Note that the table may contain duplicates. e.g., dp1 == dp2.
	91	*/
	92	i_tab[0] = dp1;
	93	i_tab[1] = dp2;
	94	i_tab[2] = ip1;
cfa853e4	95	if (ip2) {
1da177e4 LT	96	*num_inodes = 4;
1da177e4 LT	97	i_tab[3] = ip2;
cfa853e4 CH	98	} else {
	99	*num_inodes = 3;
	100	i_tab[3] = NULL;
1da177e4 LT	101	}
	102
	103	/*
	104	* Sort the elements via bubble sort. (Remember, there are at
	105	* most 4 elements to sort, so this is adequate.)
	106	*/
cfa853e4 CH	107	for (i = 0; i < *num_inodes; i++) {
cfa853e4 CH	108	for (j = 1; j < *num_inodes; j++) {
1da177e4 LT	109	if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
	110	temp = i_tab[j];
	111	i_tab[j] = i_tab[j-1];
	112	i_tab[j-1] = temp;
	113	}
	114	}
	115	}
1da177e4 LT	116	}
1da177e4 LT	117
1da177e4 LT	118	/*
	119	* xfs_rename
	120	*/
	121	int
	122	xfs_rename(
993386c1	123	xfs_inode_t *src_dp,
556b8b16 BN	124	struct xfs_name *src_name,
556b8b16 BN	125	xfs_inode_t *src_ip,
3937be5b	126	xfs_inode_t *target_dp,
cfa853e4 CH	127	struct xfs_name *target_name,
cfa853e4 CH	128	xfs_inode_t *target_ip)
1da177e4	129	{
cfa853e4	130	xfs_trans_t *tp = NULL;
993386c1	131	xfs_mount_t *mp = src_dp->i_mount;
1da177e4 LT	132	int new_parent; /* moving to a new dir */
	133	int src_is_directory; /* src_name is a directory */
	134	int error;
	135	xfs_bmap_free_t free_list;
	136	xfs_fsblock_t first_block;
	137	int cancel_flags;
	138	int committed;
	139	xfs_inode_t *inodes[4];
1da177e4	140	int spaceres;
1da177e4	141	int num_inodes;
1da177e4	142
cf441eeb	143	xfs_itrace_entry(src_dp);
3937be5b	144	xfs_itrace_entry(target_dp);
1da177e4	145
eb9df39d CH	146	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_RENAME) \|\|
eb9df39d CH	147	DM_EVENT_ENABLED(target_dp, DM_EVENT_RENAME)) {
1da177e4	148	error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME,
bc4ac74a CH	149	src_dp, DM_RIGHT_NULL,
bc4ac74a CH	150	target_dp, DM_RIGHT_NULL,
556b8b16	151	src_name->name, target_name->name,
1da177e4	152	0, 0, 0);
cfa853e4	153	if (error)
1da177e4	154	return error;
1da177e4 LT	155	}
	156	/* Return through std_return after this point. */
	157
cfa853e4 CH	158	new_parent = (src_dp != target_dp);
cfa853e4 CH	159	src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR);
1da177e4	160
cfa853e4	161	if (src_is_directory) {
1da177e4 LT	162	/*
	163	* Check for link count overflow on target_dp
	164	*/
cfa853e4	165	if (target_ip == NULL && new_parent &&
1da177e4	166	target_dp->i_d.di_nlink >= XFS_MAXLINK) {
1da177e4	167	error = XFS_ERROR(EMLINK);
cfa853e4	168	goto std_return;
1da177e4 LT	169	}
	170	}
	171
cfa853e4 CH	172	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
cfa853e4 CH	173	inodes, &num_inodes);
1da177e4	174
1da177e4 LT	175	XFS_BMAP_INIT(&free_list, &first_block);
	176	tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
	177	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
556b8b16	178	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
1da177e4 LT	179	error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0,
	180	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	181	if (error == ENOSPC) {
	182	spaceres = 0;
	183	error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0,
	184	XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT);
	185	}
	186	if (error) {
1da177e4	187	xfs_trans_cancel(tp, 0);
1ac74e01	188	goto std_return;
1da177e4 LT	189	}
	190
	191	/*
	192	* Attach the dquots to the inodes
	193	*/
	194	if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) {
	195	xfs_trans_cancel(tp, cancel_flags);
1ac74e01	196	goto std_return;
1da177e4 LT	197	}
	198
	199	/*
cfa853e4 CH	200	* Lock all the participating inodes. Depending upon whether
	201	* the target_name exists in the target directory, and
	202	* whether the target directory is the same as the source
	203	* directory, we can lock from 2 to 4 inodes.
	204	*/
	205	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
	206
	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.
1da177e4	211	*/
cfa853e4 CH	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);
6a0775a9	215	xfs_rename_unlock4(inodes, XFS_ILOCK_EXCL);
cfa853e4	216	xfs_trans_cancel(tp, cancel_flags);
1ac74e01	217	goto std_return;
cfa853e4	218	}
1da177e4 LT	219
	220	/*
	221	* Join all the inodes to the transaction. From this point on,
	222	* we can rely on either trans_commit or trans_cancel to unlock
	223	* them. Note that we need to add a vnode reference to the
	224	* directories since trans_commit & trans_cancel will decrement
	225	* them when they unlock the inodes. Also, we need to be careful
	226	* not to add an inode to the transaction more than once.
	227	*/
3937be5b	228	IHOLD(src_dp);
1da177e4	229	xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
1ac74e01	230
1da177e4	231	if (new_parent) {
3937be5b	232	IHOLD(target_dp);
1da177e4 LT	233	xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
1da177e4 LT	234	}
1ac74e01 CH	235
	236	IHOLD(src_ip);
	237	xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
	238
	239	if (target_ip) {
	240	IHOLD(target_ip);
1da177e4 LT	241	xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
	242	}
	243
	244	/*
	245	* Set up the target.
	246	*/
	247	if (target_ip == NULL) {
	248	/*
	249	* If there's no space reservation, check the entry will
	250	* fit before actually inserting it.
	251	*/
556b8b16 BN	252	error = xfs_dir_canenter(tp, target_dp, target_name, spaceres);
556b8b16 BN	253	if (error)
1da177e4	254	goto error_return;
1da177e4 LT	255	/*
	256	* If target does not exist and the rename crosses
	257	* directories, adjust the target directory link count
	258	* to account for the ".." reference from the new entry.
	259	*/
f6c2d1fa	260	error = xfs_dir_createname(tp, target_dp, target_name,
556b8b16 BN	261	src_ip->i_ino, &first_block,
556b8b16 BN	262	&free_list, spaceres);
f6c2d1fa	263	if (error == ENOSPC)
1da177e4	264	goto error_return;
f6c2d1fa	265	if (error)
1da177e4	266	goto abort_return;
1da177e4 LT	267	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	268
	269	if (new_parent && src_is_directory) {
	270	error = xfs_bumplink(tp, target_dp);
f6c2d1fa	271	if (error)
1da177e4	272	goto abort_return;
1da177e4 LT	273	}
1da177e4 LT	274	} else { /* target_ip != NULL */
1da177e4 LT	275	/*
	276	* If target exists and it's a directory, check that both
	277	* target and source are directories and that target can be
	278	* destroyed, or that neither is a directory.
	279	*/
	280	if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
	281	/*
	282	* Make sure target dir is empty.
	283	*/
f6c2d1fa	284	if (!(xfs_dir_isempty(target_ip)) \|\|
1da177e4 LT	285	(target_ip->i_d.di_nlink > 2)) {
1da177e4 LT	286	error = XFS_ERROR(EEXIST);
1da177e4 LT	287	goto error_return;
	288	}
	289	}
	290
	291	/*
	292	* Link the source inode under the target name.
	293	* If the source inode is a directory and we are moving
	294	* it across directories, its ".." entry will be
	295	* inconsistent until we replace that down below.
	296	*
	297	* In case there is already an entry with the same
	298	* name at the destination directory, remove it first.
	299	*/
f6c2d1fa	300	error = xfs_dir_replace(tp, target_dp, target_name,
556b8b16	301	src_ip->i_ino,
f6c2d1fa NS	302	&first_block, &free_list, spaceres);
f6c2d1fa NS	303	if (error)
1da177e4	304	goto abort_return;
1da177e4 LT	305	xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
	306
	307	/*
	308	* Decrement the link count on the target since the target
	309	* dir no longer points to it.
	310	*/
	311	error = xfs_droplink(tp, target_ip);
f6c2d1fa	312	if (error)
1da177e4	313	goto abort_return;
1da177e4 LT	314
	315	if (src_is_directory) {
	316	/*
	317	* Drop the link from the old "." entry.
	318	*/
	319	error = xfs_droplink(tp, target_ip);
f6c2d1fa	320	if (error)
1da177e4	321	goto abort_return;
1da177e4	322	}
1da177e4 LT	323	} /* target_ip != NULL */
	324
	325	/*
	326	* Remove the source.
	327	*/
	328	if (new_parent && src_is_directory) {
1da177e4 LT	329	/*
	330	* Rewrite the ".." entry to point to the new
	331	* directory.
	332	*/
556b8b16 BN	333	error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
556b8b16 BN	334	target_dp->i_ino,
f6c2d1fa	335	&first_block, &free_list, spaceres);
1da177e4	336	ASSERT(error != EEXIST);
f6c2d1fa	337	if (error)
1da177e4	338	goto abort_return;
1da177e4 LT	339	}
1da177e4 LT	340
8f8670bb CH	341	/*
	342	* We always want to hit the ctime on the source inode.
	343	*
	344	* This isn't strictly required by the standards since the source
	345	* inode isn't really being changed, but old unix file systems did
	346	* it and some incremental backup programs won't work without it.
	347	*/
	348	xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG);
	349
1da177e4 LT	350	/*
	351	* Adjust the link count on src_dp. This is necessary when
	352	* renaming a directory, either within one parent when
	353	* the target existed, or across two parent directories.
	354	*/
	355	if (src_is_directory && (new_parent \|\| target_ip != NULL)) {
	356
	357	/*
	358	* Decrement link count on src_directory since the
	359	* entry that's moved no longer points to it.
	360	*/
	361	error = xfs_droplink(tp, src_dp);
f6c2d1fa	362	if (error)
1da177e4	363	goto abort_return;
1da177e4 LT	364	}
1da177e4 LT	365
556b8b16 BN	366	error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
556b8b16 BN	367	&first_block, &free_list, spaceres);
f6c2d1fa	368	if (error)
1da177e4	369	goto abort_return;
1da177e4	370
26c52951	371	xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD \| XFS_ICHGTIME_CHG);
1da177e4	372	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
26c52951	373	if (new_parent)
1da177e4	374	xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
1da177e4	375
1da177e4 LT	376	/*
	377	* If this is a synchronous mount, make sure that the
	378	* rename transaction goes to disk before returning to
	379	* the user.
	380	*/
	381	if (mp->m_flags & (XFS_MOUNT_WSYNC\|XFS_MOUNT_DIRSYNC)) {
	382	xfs_trans_set_sync(tp);
	383	}
	384
f7c99b6f	385	error = xfs_bmap_finish(&tp, &free_list, &committed);
1da177e4 LT	386	if (error) {
	387	xfs_bmap_cancel(&free_list);
	388	xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES \|
	389	XFS_TRANS_ABORT));
1da177e4 LT	390	goto std_return;
	391	}
	392
	393	/*
	394	* trans_commit will unlock src_ip, target_ip & decrement
	395	* the vnode references.
	396	*/
1c72bf90	397	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1da177e4 LT	398
	399	/* Fall through to std_return with error = 0 or errno from
	400	* xfs_trans_commit */
	401	std_return:
eb9df39d CH	402	if (DM_EVENT_ENABLED(src_dp, DM_EVENT_POSTRENAME) \|\|
eb9df39d CH	403	DM_EVENT_ENABLED(target_dp, DM_EVENT_POSTRENAME)) {
1da177e4	404	(void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME,
bc4ac74a CH	405	src_dp, DM_RIGHT_NULL,
bc4ac74a CH	406	target_dp, DM_RIGHT_NULL,
556b8b16	407	src_name->name, target_name->name,
1da177e4 LT	408	0, error, 0);
	409	}
	410	return error;
	411
	412	abort_return:
	413	cancel_flags \|= XFS_TRANS_ABORT;
	414	/* FALLTHROUGH */
	415	error_return:
	416	xfs_bmap_cancel(&free_list);
	417	xfs_trans_cancel(tp, cancel_flags);
	418	goto std_return;
1da177e4	419	}