[deliverable/linux.git] / fs / xfs / xfs_dfrag.c

/*
 * Copyright (c) 2000-2006 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_bit.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_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_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_btree.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_dfrag.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_vnodeops.h"

/*
 * Syssgi interface for swapext
 */
int
xfs_swapext(
	xfs_swapext_t	__user *sxu)
{
	xfs_swapext_t	*sxp;
	xfs_inode_t     *ip, *tip;
	struct file	*file, *target_file;
	int		error = 0;

	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
	if (!sxp) {
		error = XFS_ERROR(ENOMEM);
		goto out;
	}

	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
		error = XFS_ERROR(EFAULT);
		goto out_free_sxp;
	}

	/* Pull information for the target fd */
	file = fget((int)sxp->sx_fdtarget);
	if (!file) {
		error = XFS_ERROR(EINVAL);
		goto out_free_sxp;
	}

	target_file = fget((int)sxp->sx_fdtmp);
	if (!target_file) {
		error = XFS_ERROR(EINVAL);
		goto out_put_file;
	}

	ip = XFS_I(file->f_path.dentry->d_inode);
	tip = XFS_I(target_file->f_path.dentry->d_inode);

	if (ip->i_mount != tip->i_mount) {
		error = XFS_ERROR(EINVAL);
		goto out_put_target_file;
	}

	if (ip->i_ino == tip->i_ino) {
		error = XFS_ERROR(EINVAL);
		goto out_put_target_file;
	}

	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
		error = XFS_ERROR(EIO);
		goto out_put_target_file;
	}

	error = xfs_swap_extents(ip, tip, sxp);

 out_put_target_file:
	fput(target_file);
 out_put_file:
	fput(file);
 out_free_sxp:
	kmem_free(sxp, sizeof(xfs_swapext_t));
 out:
	return error;
}

int
xfs_swap_extents(
	xfs_inode_t	*ip,
	xfs_inode_t	*tip,
	xfs_swapext_t	*sxp)
{
	xfs_mount_t	*mp;
	xfs_inode_t	*ips[2];
	xfs_trans_t	*tp;
	xfs_bstat_t	*sbp = &sxp->sx_stat;
	bhv_vnode_t	*vp, *tvp;
	xfs_ifork_t	*tempifp, *ifp, *tifp;
	int		ilf_fields, tilf_fields;
	static uint	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
	int		error = 0;
	int		aforkblks = 0;
	int		taforkblks = 0;
	__uint64_t	tmp;
	char		locked = 0;

	mp = ip->i_mount;

	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	if (!tempifp) {
		error = XFS_ERROR(ENOMEM);
		goto error0;
	}

	sbp = &sxp->sx_stat;
	vp = XFS_ITOV(ip);
	tvp = XFS_ITOV(tip);

	/* Lock in i_ino order */
	if (ip->i_ino < tip->i_ino) {
		ips[0] = ip;
		ips[1] = tip;
	} else {
		ips[0] = tip;
		ips[1] = ip;
	}

	xfs_lock_inodes(ips, 2, 0, lock_flags);
	locked = 1;

	/* Check permissions */
	error = xfs_iaccess(ip, S_IWUSR, NULL);
	if (error)
		goto error0;

	error = xfs_iaccess(tip, S_IWUSR, NULL);
	if (error)
		goto error0;

	/* Verify that both files have the same format */
	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	/* Verify both files are either real-time or non-realtime */
	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	/* Should never get a local format */
	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
	    tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	if (VN_CACHED(tvp) != 0) {
		xfs_inval_cached_trace(tip, 0, -1, 0, -1);
		error = xfs_flushinval_pages(tip, 0, -1,
				FI_REMAPF_LOCKED);
		if (error)
			goto error0;
	}

	/* Verify O_DIRECT for ftmp */
	if (VN_CACHED(tvp) != 0) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	/* Verify all data are being swapped */
	if (sxp->sx_offset != 0 ||
	    sxp->sx_length != ip->i_d.di_size ||
	    sxp->sx_length != tip->i_d.di_size) {
		error = XFS_ERROR(EFAULT);
		goto error0;
	}

	/*
	 * If the target has extended attributes, the tmp file
	 * must also in order to ensure the correct data fork
	 * format.
	 */
	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	/*
	 * Compare the current change & modify times with that
	 * passed in.  If they differ, we abort this swap.
	 * This is the mechanism used to ensure the calling
	 * process that the file was not changed out from
	 * under it.
	 */
	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
	    (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
	    (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
	    (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
		error = XFS_ERROR(EBUSY);
		goto error0;
	}

	/* We need to fail if the file is memory mapped.  Once we have tossed
	 * all existing pages, the page fault will have no option
	 * but to go to the filesystem for pages. By making the page fault call
	 * vop_read (or write in the case of autogrow) they block on the iolock
	 * until we have switched the extents.
	 */
	if (VN_MAPPED(vp)) {
		error = XFS_ERROR(EBUSY);
		goto error0;
	}

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	xfs_iunlock(tip, XFS_ILOCK_EXCL);

	/*
	 * There is a race condition here since we gave up the
	 * ilock.  However, the data fork will not change since
	 * we have the iolock (locked for truncation too) so we
	 * are safe.  We don't really care if non-io related
	 * fields change.
	 */

	xfs_tosspages(ip, 0, -1, FI_REMAPF);

	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	if ((error = xfs_trans_reserve(tp, 0,
				     XFS_ICHANGE_LOG_RES(mp), 0,
				     0, 0))) {
		xfs_iunlock(ip,  XFS_IOLOCK_EXCL);
		xfs_iunlock(tip, XFS_IOLOCK_EXCL);
		xfs_trans_cancel(tp, 0);
		locked = 0;
		goto error0;
	}
	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);

	/*
	 * Count the number of extended attribute blocks
	 */
	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	     (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
		error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
		if (error) {
			xfs_trans_cancel(tp, 0);
			goto error0;
		}
	}
	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	     (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
		error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
			&taforkblks);
		if (error) {
			xfs_trans_cancel(tp, 0);
			goto error0;
		}
	}

	/*
	 * Swap the data forks of the inodes
	 */
	ifp = &ip->i_df;
	tifp = &tip->i_df;
	*tempifp = *ifp;	/* struct copy */
	*ifp = *tifp;		/* struct copy */
	*tifp = *tempifp;	/* struct copy */

	/*
	 * Fix the on-disk inode values
	 */
	tmp = (__uint64_t)ip->i_d.di_nblocks;
	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;

	tmp = (__uint64_t) ip->i_d.di_nextents;
	ip->i_d.di_nextents = tip->i_d.di_nextents;
	tip->i_d.di_nextents = tmp;

	tmp = (__uint64_t) ip->i_d.di_format;
	ip->i_d.di_format = tip->i_d.di_format;
	tip->i_d.di_format = tmp;

	ilf_fields = XFS_ILOG_CORE;

	switch(ip->i_d.di_format) {
	case XFS_DINODE_FMT_EXTENTS:
		/* If the extents fit in the inode, fix the
		 * pointer.  Otherwise it's already NULL or
		 * pointing to the extent.
		 */
		if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
			ifp->if_u1.if_extents =
				ifp->if_u2.if_inline_ext;
		}
		ilf_fields |= XFS_ILOG_DEXT;
		break;
	case XFS_DINODE_FMT_BTREE:
		ilf_fields |= XFS_ILOG_DBROOT;
		break;
	}

	tilf_fields = XFS_ILOG_CORE;

	switch(tip->i_d.di_format) {
	case XFS_DINODE_FMT_EXTENTS:
		/* If the extents fit in the inode, fix the
		 * pointer.  Otherwise it's already NULL or
		 * pointing to the extent.
		 */
		if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
			tifp->if_u1.if_extents =
				tifp->if_u2.if_inline_ext;
		}
		tilf_fields |= XFS_ILOG_DEXT;
		break;
	case XFS_DINODE_FMT_BTREE:
		tilf_fields |= XFS_ILOG_DBROOT;
		break;
	}

	/*
	 * Increment vnode ref counts since xfs_trans_commit &
	 * xfs_trans_cancel will both unlock the inodes and
	 * decrement the associated ref counts.
	 */
	VN_HOLD(vp);
	VN_HOLD(tvp);

	xfs_trans_ijoin(tp, ip, lock_flags);
	xfs_trans_ijoin(tp, tip, lock_flags);

	xfs_trans_log_inode(tp, ip,  ilf_fields);
	xfs_trans_log_inode(tp, tip, tilf_fields);

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

	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
	locked = 0;

 error0:
	if (locked) {
		xfs_iunlock(ip,  lock_flags);
		xfs_iunlock(tip, lock_flags);
	}
	if (tempifp != NULL)
		kmem_free(tempifp, sizeof(xfs_ifork_t));
	return error;
}
Commit	Line	Data
1da177e4	1	/*
3e57ecf6	2	* Copyright (c) 2000-2006 Silicon Graphics, Inc.
7b718769	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"
a844f451	21	#include "xfs_bit.h"
1da177e4	22	#include "xfs_log.h"
a844f451	23	#include "xfs_inum.h"
1da177e4 LT	24	#include "xfs_trans.h"
1da177e4 LT	25	#include "xfs_sb.h"
a844f451	26	#include "xfs_ag.h"
1da177e4 LT	27	#include "xfs_dir2.h"
	28	#include "xfs_dmapi.h"
	29	#include "xfs_mount.h"
1da177e4	30	#include "xfs_bmap_btree.h"
a844f451	31	#include "xfs_alloc_btree.h"
1da177e4	32	#include "xfs_ialloc_btree.h"
1da177e4	33	#include "xfs_dir2_sf.h"
a844f451	34	#include "xfs_attr_sf.h"
1da177e4	35	#include "xfs_dinode.h"
1da177e4	36	#include "xfs_inode.h"
a844f451	37	#include "xfs_inode_item.h"
1da177e4	38	#include "xfs_bmap.h"
a844f451	39	#include "xfs_btree.h"
1da177e4 LT	40	#include "xfs_ialloc.h"
	41	#include "xfs_itable.h"
	42	#include "xfs_dfrag.h"
	43	#include "xfs_error.h"
1da177e4	44	#include "xfs_rw.h"
739bfb2a	45	#include "xfs_vnodeops.h"
1da177e4 LT	46
	47	/*
	48	* Syssgi interface for swapext
	49	*/
	50	int
	51	xfs_swapext(
d0cfb373	52	xfs_swapext_t __user *sxu)
1da177e4	53	{
d0cfb373	54	xfs_swapext_t *sxp;
35fec8df CH	55	xfs_inode_t ip, tip;
35fec8df CH	56	struct file file, target_file;
1da177e4	57	int error = 0;
1da177e4	58
d0cfb373	59	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
3e57ecf6	60	if (!sxp) {
d0cfb373	61	error = XFS_ERROR(ENOMEM);
35fec8df	62	goto out;
d0cfb373 ES	63	}
	64
	65	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
	66	error = XFS_ERROR(EFAULT);
35fec8df	67	goto out_free_sxp;
d0cfb373	68	}
1da177e4 LT	69
1da177e4 LT	70	/* Pull information for the target fd */
35fec8df CH	71	file = fget((int)sxp->sx_fdtarget);
35fec8df CH	72	if (!file) {
1da177e4	73	error = XFS_ERROR(EINVAL);
35fec8df	74	goto out_free_sxp;
1da177e4 LT	75	}
1da177e4 LT	76
35fec8df CH	77	target_file = fget((int)sxp->sx_fdtmp);
35fec8df CH	78	if (!target_file) {
1da177e4	79	error = XFS_ERROR(EINVAL);
35fec8df	80	goto out_put_file;
1da177e4 LT	81	}
1da177e4 LT	82
35fec8df CH	83	ip = XFS_I(file->f_path.dentry->d_inode);
35fec8df CH	84	tip = XFS_I(target_file->f_path.dentry->d_inode);
1da177e4 LT	85
1da177e4 LT	86	if (ip->i_mount != tip->i_mount) {
35fec8df CH	87	error = XFS_ERROR(EINVAL);
35fec8df CH	88	goto out_put_target_file;
1da177e4 LT	89	}
	90
	91	if (ip->i_ino == tip->i_ino) {
35fec8df CH	92	error = XFS_ERROR(EINVAL);
35fec8df CH	93	goto out_put_target_file;
1da177e4 LT	94	}
1da177e4 LT	95
35fec8df CH	96	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
	97	error = XFS_ERROR(EIO);
	98	goto out_put_target_file;
1da177e4 LT	99	}
1da177e4 LT	100
541d7d3c	101	error = xfs_swap_extents(ip, tip, sxp);
3e57ecf6	102
35fec8df CH	103	out_put_target_file:
	104	fput(target_file);
	105	out_put_file:
	106	fput(file);
	107	out_free_sxp:
	108	kmem_free(sxp, sizeof(xfs_swapext_t));
	109	out:
3e57ecf6 OW	110	return error;
	111	}
	112
	113	int
	114	xfs_swap_extents(
	115	xfs_inode_t *ip,
	116	xfs_inode_t *tip,
	117	xfs_swapext_t *sxp)
	118	{
	119	xfs_mount_t *mp;
	120	xfs_inode_t *ips[2];
	121	xfs_trans_t *tp;
	122	xfs_bstat_t *sbp = &sxp->sx_stat;
67fcaa73	123	bhv_vnode_t vp, tvp;
3e57ecf6 OW	124	xfs_ifork_t tempifp, ifp, *tifp;
	125	int ilf_fields, tilf_fields;
	126	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
	127	int error = 0;
	128	int aforkblks = 0;
	129	int taforkblks = 0;
	130	__uint64_t tmp;
	131	char locked = 0;
	132
	133	mp = ip->i_mount;
	134
	135	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	136	if (!tempifp) {
	137	error = XFS_ERROR(ENOMEM);
	138	goto error0;
	139	}
	140
	141	sbp = &sxp->sx_stat;
	142	vp = XFS_ITOV(ip);
	143	tvp = XFS_ITOV(tip);
1da177e4 LT	144
	145	/* Lock in i_ino order */
	146	if (ip->i_ino < tip->i_ino) {
	147	ips[0] = ip;
	148	ips[1] = tip;
	149	} else {
	150	ips[0] = tip;
	151	ips[1] = ip;
	152	}
d0cfb373	153
1da177e4	154	xfs_lock_inodes(ips, 2, 0, lock_flags);
3e57ecf6	155	locked = 1;
1da177e4 LT	156
	157	/* Check permissions */
	158	error = xfs_iaccess(ip, S_IWUSR, NULL);
	159	if (error)
	160	goto error0;
	161
	162	error = xfs_iaccess(tip, S_IWUSR, NULL);
	163	if (error)
	164	goto error0;
	165
	166	/* Verify that both files have the same format */
	167	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	168	error = XFS_ERROR(EINVAL);
	169	goto error0;
	170	}
	171
	172	/* Verify both files are either real-time or non-realtime */
71ddabb9	173	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1da177e4 LT	174	error = XFS_ERROR(EINVAL);
	175	goto error0;
	176	}
	177
	178	/* Should never get a local format */
	179	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	180	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	181	error = XFS_ERROR(EINVAL);
	182	goto error0;
	183	}
	184
bd5a876a	185	if (VN_CACHED(tvp) != 0) {
613d7043	186	xfs_inval_cached_trace(tip, 0, -1, 0, -1);
739bfb2a CH	187	error = xfs_flushinval_pages(tip, 0, -1,
739bfb2a CH	188	FI_REMAPF_LOCKED);
d3cf2094 LM	189	if (error)
d3cf2094 LM	190	goto error0;
bd5a876a	191	}
1da177e4 LT	192
	193	/* Verify O_DIRECT for ftmp */
	194	if (VN_CACHED(tvp) != 0) {
	195	error = XFS_ERROR(EINVAL);
	196	goto error0;
	197	}
	198
	199	/* Verify all data are being swapped */
d0cfb373 ES	200	if (sxp->sx_offset != 0 \|\|
	201	sxp->sx_length != ip->i_d.di_size \|\|
	202	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	203	error = XFS_ERROR(EFAULT);
	204	goto error0;
	205	}
	206
	207	/*
	208	* If the target has extended attributes, the tmp file
	209	* must also in order to ensure the correct data fork
	210	* format.
	211	*/
	212	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	213	error = XFS_ERROR(EINVAL);
	214	goto error0;
	215	}
	216
	217	/*
	218	* Compare the current change & modify times with that
	219	* passed in. If they differ, we abort this swap.
	220	* This is the mechanism used to ensure the calling
	221	* process that the file was not changed out from
	222	* under it.
	223	*/
	224	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	225	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	226	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	227	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	228	error = XFS_ERROR(EBUSY);
	229	goto error0;
	230	}
	231
	232	/* We need to fail if the file is memory mapped. Once we have tossed
	233	* all existing pages, the page fault will have no option
	234	* but to go to the filesystem for pages. By making the page fault call
67fcaa73	235	* vop_read (or write in the case of autogrow) they block on the iolock
1da177e4 LT	236	* until we have switched the extents.
	237	*/
	238	if (VN_MAPPED(vp)) {
	239	error = XFS_ERROR(EBUSY);
	240	goto error0;
	241	}
	242
	243	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	244	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	245
	246	/*
	247	* There is a race condition here since we gave up the
	248	* ilock. However, the data fork will not change since
	249	* we have the iolock (locked for truncation too) so we
	250	* are safe. We don't really care if non-io related
	251	* fields change.
	252	*/
	253
739bfb2a	254	xfs_tosspages(ip, 0, -1, FI_REMAPF);
1da177e4 LT	255
	256	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	257	if ((error = xfs_trans_reserve(tp, 0,
	258	XFS_ICHANGE_LOG_RES(mp), 0,
	259	0, 0))) {
	260	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	261	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	262	xfs_trans_cancel(tp, 0);
d0cfb373 ES	263	locked = 0;
d0cfb373 ES	264	goto error0;
1da177e4 LT	265	}
	266	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
	267
	268	/*
	269	* Count the number of extended attribute blocks
	270	*/
	271	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	272	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	273	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	274	if (error) {
1da177e4	275	xfs_trans_cancel(tp, 0);
d0cfb373	276	goto error0;
1da177e4 LT	277	}
	278	}
	279	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	280	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	281	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	282	&taforkblks);
	283	if (error) {
1da177e4	284	xfs_trans_cancel(tp, 0);
d0cfb373	285	goto error0;
1da177e4 LT	286	}
	287	}
	288
	289	/*
	290	* Swap the data forks of the inodes
	291	*/
	292	ifp = &ip->i_df;
	293	tifp = &tip->i_df;
d0cfb373 ES	294	tempifp = ifp; /* struct copy */
	295	ifp = tifp; /* struct copy */
	296	tifp = tempifp; /* struct copy */
1da177e4 LT	297
	298	/*
	299	* Fix the on-disk inode values
	300	*/
	301	tmp = (__uint64_t)ip->i_d.di_nblocks;
	302	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	303	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	304
	305	tmp = (__uint64_t) ip->i_d.di_nextents;
	306	ip->i_d.di_nextents = tip->i_d.di_nextents;
	307	tip->i_d.di_nextents = tmp;
	308
	309	tmp = (__uint64_t) ip->i_d.di_format;
	310	ip->i_d.di_format = tip->i_d.di_format;
	311	tip->i_d.di_format = tmp;
	312
	313	ilf_fields = XFS_ILOG_CORE;
	314
	315	switch(ip->i_d.di_format) {
	316	case XFS_DINODE_FMT_EXTENTS:
	317	/* If the extents fit in the inode, fix the
	318	* pointer. Otherwise it's already NULL or
	319	* pointing to the extent.
	320	*/
	321	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	322	ifp->if_u1.if_extents =
	323	ifp->if_u2.if_inline_ext;
	324	}
	325	ilf_fields \|= XFS_ILOG_DEXT;
	326	break;
	327	case XFS_DINODE_FMT_BTREE:
	328	ilf_fields \|= XFS_ILOG_DBROOT;
	329	break;
	330	}
	331
	332	tilf_fields = XFS_ILOG_CORE;
	333
	334	switch(tip->i_d.di_format) {
	335	case XFS_DINODE_FMT_EXTENTS:
	336	/* If the extents fit in the inode, fix the
	337	* pointer. Otherwise it's already NULL or
	338	* pointing to the extent.
	339	*/
	340	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	341	tifp->if_u1.if_extents =
	342	tifp->if_u2.if_inline_ext;
	343	}
	344	tilf_fields \|= XFS_ILOG_DEXT;
	345	break;
	346	case XFS_DINODE_FMT_BTREE:
	347	tilf_fields \|= XFS_ILOG_DBROOT;
	348	break;
	349	}
	350
	351	/*
	352	* Increment vnode ref counts since xfs_trans_commit &
	353	* xfs_trans_cancel will both unlock the inodes and
	354	* decrement the associated ref counts.
	355	*/
	356	VN_HOLD(vp);
	357	VN_HOLD(tvp);
	358
	359	xfs_trans_ijoin(tp, ip, lock_flags);
	360	xfs_trans_ijoin(tp, tip, lock_flags);
361
362	xfs_trans_log_inode(tp, ip, ilf_fields);
363	xfs_trans_log_inode(tp, tip, tilf_fields);
364
365	/*
366	* If this is a synchronous mount, make sure that the
367	* transaction goes to disk before returning to the user.
368	*/
369	if (mp->m_flags & XFS_MOUNT_WSYNC) {
370	xfs_trans_set_sync(tp);
371	}
372
1c72bf90	373	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
d0cfb373	374	locked = 0;
1da177e4 LT	375
	376	error0:
	377	if (locked) {
	378	xfs_iunlock(ip, lock_flags);
	379	xfs_iunlock(tip, lock_flags);
	380	}
d0cfb373 ES	381	if (tempifp != NULL)
d0cfb373 ES	382	kmem_free(tempifp, sizeof(xfs_ifork_t));
1da177e4 LT	383	return error;
1da177e4 LT	384	}