[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;
	}

	if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) {
		error = XFS_ERROR(EBADF);
		goto out_put_file;
	}

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

	if (!(target_file->f_mode & FMODE_WRITE) ||
	    (target_file->f_flags & O_APPEND)) {
		error = XFS_ERROR(EBADF);
		goto out_put_target_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;

	/* 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
f6aa7f21 CH	77	if (!(file->f_mode & FMODE_WRITE) \|\| (file->f_flags & O_APPEND)) {
	78	error = XFS_ERROR(EBADF);
	79	goto out_put_file;
	80	}
	81
35fec8df CH	82	target_file = fget((int)sxp->sx_fdtmp);
35fec8df CH	83	if (!target_file) {
1da177e4	84	error = XFS_ERROR(EINVAL);
35fec8df	85	goto out_put_file;
1da177e4 LT	86	}
1da177e4 LT	87
f6aa7f21 CH	88	if (!(target_file->f_mode & FMODE_WRITE) \|\|
	89	(target_file->f_flags & O_APPEND)) {
	90	error = XFS_ERROR(EBADF);
	91	goto out_put_target_file;
	92	}
	93
35fec8df CH	94	ip = XFS_I(file->f_path.dentry->d_inode);
35fec8df CH	95	tip = XFS_I(target_file->f_path.dentry->d_inode);
1da177e4 LT	96
1da177e4 LT	97	if (ip->i_mount != tip->i_mount) {
35fec8df CH	98	error = XFS_ERROR(EINVAL);
35fec8df CH	99	goto out_put_target_file;
1da177e4 LT	100	}
	101
	102	if (ip->i_ino == tip->i_ino) {
35fec8df CH	103	error = XFS_ERROR(EINVAL);
35fec8df CH	104	goto out_put_target_file;
1da177e4 LT	105	}
1da177e4 LT	106
35fec8df CH	107	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
	108	error = XFS_ERROR(EIO);
	109	goto out_put_target_file;
1da177e4 LT	110	}
1da177e4 LT	111
541d7d3c	112	error = xfs_swap_extents(ip, tip, sxp);
3e57ecf6	113
35fec8df CH	114	out_put_target_file:
	115	fput(target_file);
	116	out_put_file:
	117	fput(file);
	118	out_free_sxp:
	119	kmem_free(sxp, sizeof(xfs_swapext_t));
	120	out:
3e57ecf6 OW	121	return error;
	122	}
	123
	124	int
	125	xfs_swap_extents(
	126	xfs_inode_t *ip,
	127	xfs_inode_t *tip,
	128	xfs_swapext_t *sxp)
	129	{
	130	xfs_mount_t *mp;
	131	xfs_inode_t *ips[2];
	132	xfs_trans_t *tp;
	133	xfs_bstat_t *sbp = &sxp->sx_stat;
67fcaa73	134	bhv_vnode_t vp, tvp;
3e57ecf6 OW	135	xfs_ifork_t tempifp, ifp, *tifp;
	136	int ilf_fields, tilf_fields;
	137	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
	138	int error = 0;
	139	int aforkblks = 0;
	140	int taforkblks = 0;
	141	__uint64_t tmp;
	142	char locked = 0;
	143
	144	mp = ip->i_mount;
	145
	146	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	147	if (!tempifp) {
	148	error = XFS_ERROR(ENOMEM);
	149	goto error0;
	150	}
	151
	152	sbp = &sxp->sx_stat;
	153	vp = XFS_ITOV(ip);
	154	tvp = XFS_ITOV(tip);
1da177e4 LT	155
	156	/* Lock in i_ino order */
	157	if (ip->i_ino < tip->i_ino) {
	158	ips[0] = ip;
	159	ips[1] = tip;
	160	} else {
	161	ips[0] = tip;
	162	ips[1] = ip;
	163	}
d0cfb373	164
1da177e4	165	xfs_lock_inodes(ips, 2, 0, lock_flags);
3e57ecf6	166	locked = 1;
1da177e4	167
1da177e4 LT	168	/* Verify that both files have the same format */
	169	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	170	error = XFS_ERROR(EINVAL);
	171	goto error0;
	172	}
	173
	174	/* Verify both files are either real-time or non-realtime */
71ddabb9	175	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1da177e4 LT	176	error = XFS_ERROR(EINVAL);
	177	goto error0;
	178	}
	179
	180	/* Should never get a local format */
	181	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	182	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	183	error = XFS_ERROR(EINVAL);
	184	goto error0;
	185	}
	186
bd5a876a	187	if (VN_CACHED(tvp) != 0) {
613d7043	188	xfs_inval_cached_trace(tip, 0, -1, 0, -1);
739bfb2a CH	189	error = xfs_flushinval_pages(tip, 0, -1,
739bfb2a CH	190	FI_REMAPF_LOCKED);
d3cf2094 LM	191	if (error)
d3cf2094 LM	192	goto error0;
bd5a876a	193	}
1da177e4 LT	194
	195	/* Verify O_DIRECT for ftmp */
	196	if (VN_CACHED(tvp) != 0) {
	197	error = XFS_ERROR(EINVAL);
	198	goto error0;
	199	}
	200
	201	/* Verify all data are being swapped */
d0cfb373 ES	202	if (sxp->sx_offset != 0 \|\|
	203	sxp->sx_length != ip->i_d.di_size \|\|
	204	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	205	error = XFS_ERROR(EFAULT);
	206	goto error0;
	207	}
	208
	209	/*
	210	* If the target has extended attributes, the tmp file
	211	* must also in order to ensure the correct data fork
	212	* format.
	213	*/
	214	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	215	error = XFS_ERROR(EINVAL);
	216	goto error0;
	217	}
	218
	219	/*
	220	* Compare the current change & modify times with that
	221	* passed in. If they differ, we abort this swap.
	222	* This is the mechanism used to ensure the calling
	223	* process that the file was not changed out from
	224	* under it.
	225	*/
	226	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	227	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	228	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	229	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	230	error = XFS_ERROR(EBUSY);
	231	goto error0;
	232	}
	233
	234	/* We need to fail if the file is memory mapped. Once we have tossed
	235	* all existing pages, the page fault will have no option
	236	* but to go to the filesystem for pages. By making the page fault call
67fcaa73	237	* vop_read (or write in the case of autogrow) they block on the iolock
1da177e4 LT	238	* until we have switched the extents.
	239	*/
	240	if (VN_MAPPED(vp)) {
	241	error = XFS_ERROR(EBUSY);
	242	goto error0;
	243	}
	244
	245	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	246	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	247
	248	/*
	249	* There is a race condition here since we gave up the
	250	* ilock. However, the data fork will not change since
	251	* we have the iolock (locked for truncation too) so we
	252	* are safe. We don't really care if non-io related
	253	* fields change.
	254	*/
	255
739bfb2a	256	xfs_tosspages(ip, 0, -1, FI_REMAPF);
1da177e4 LT	257
	258	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	259	if ((error = xfs_trans_reserve(tp, 0,
	260	XFS_ICHANGE_LOG_RES(mp), 0,
	261	0, 0))) {
	262	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	263	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	264	xfs_trans_cancel(tp, 0);
d0cfb373 ES	265	locked = 0;
d0cfb373 ES	266	goto error0;
1da177e4 LT	267	}
	268	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
	269
	270	/*
	271	* Count the number of extended attribute blocks
	272	*/
	273	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	274	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	275	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	276	if (error) {
1da177e4	277	xfs_trans_cancel(tp, 0);
d0cfb373	278	goto error0;
1da177e4 LT	279	}
	280	}
	281	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	282	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	283	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	284	&taforkblks);
	285	if (error) {
1da177e4	286	xfs_trans_cancel(tp, 0);
d0cfb373	287	goto error0;
1da177e4 LT	288	}
	289	}
	290
	291	/*
	292	* Swap the data forks of the inodes
	293	*/
	294	ifp = &ip->i_df;
	295	tifp = &tip->i_df;
d0cfb373 ES	296	tempifp = ifp; /* struct copy */
	297	ifp = tifp; /* struct copy */
	298	tifp = tempifp; /* struct copy */
1da177e4 LT	299
	300	/*
	301	* Fix the on-disk inode values
	302	*/
	303	tmp = (__uint64_t)ip->i_d.di_nblocks;
	304	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	305	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	306
	307	tmp = (__uint64_t) ip->i_d.di_nextents;
	308	ip->i_d.di_nextents = tip->i_d.di_nextents;
	309	tip->i_d.di_nextents = tmp;
	310
	311	tmp = (__uint64_t) ip->i_d.di_format;
	312	ip->i_d.di_format = tip->i_d.di_format;
	313	tip->i_d.di_format = tmp;
	314
	315	ilf_fields = XFS_ILOG_CORE;
	316
	317	switch(ip->i_d.di_format) {
	318	case XFS_DINODE_FMT_EXTENTS:
	319	/* If the extents fit in the inode, fix the
	320	* pointer. Otherwise it's already NULL or
	321	* pointing to the extent.
	322	*/
	323	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	324	ifp->if_u1.if_extents =
	325	ifp->if_u2.if_inline_ext;
	326	}
	327	ilf_fields \|= XFS_ILOG_DEXT;
	328	break;
	329	case XFS_DINODE_FMT_BTREE:
	330	ilf_fields \|= XFS_ILOG_DBROOT;
	331	break;
	332	}
	333
	334	tilf_fields = XFS_ILOG_CORE;
	335
	336	switch(tip->i_d.di_format) {
	337	case XFS_DINODE_FMT_EXTENTS:
	338	/* If the extents fit in the inode, fix the
	339	* pointer. Otherwise it's already NULL or
	340	* pointing to the extent.
	341	*/
	342	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	343	tifp->if_u1.if_extents =
	344	tifp->if_u2.if_inline_ext;
	345	}
	346	tilf_fields \|= XFS_ILOG_DEXT;
	347	break;
	348	case XFS_DINODE_FMT_BTREE:
	349	tilf_fields \|= XFS_ILOG_DBROOT;
	350	break;
	351	}
	352
	353	/*
	354	* Increment vnode ref counts since xfs_trans_commit &
	355	* xfs_trans_cancel will both unlock the inodes and
	356	* decrement the associated ref counts.
	357	*/
	358	VN_HOLD(vp);
	359	VN_HOLD(tvp);
	360
	361	xfs_trans_ijoin(tp, ip, lock_flags);
	362	xfs_trans_ijoin(tp, tip, lock_flags);
363
364	xfs_trans_log_inode(tp, ip, ilf_fields);
365	xfs_trans_log_inode(tp, tip, tilf_fields);
366
367	/*
368	* If this is a synchronous mount, make sure that the
369	* transaction goes to disk before returning to the user.
370	*/
371	if (mp->m_flags & XFS_MOUNT_WSYNC) {
372	xfs_trans_set_sync(tp);
373	}
374
1c72bf90	375	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
d0cfb373	376	locked = 0;
1da177e4 LT	377
	378	error0:
	379	if (locked) {
	380	xfs_iunlock(ip, lock_flags);
	381	xfs_iunlock(tip, lock_flags);
	382	}
d0cfb373 ES	383	if (tempifp != NULL)
d0cfb373 ES	384	kmem_free(tempifp, sizeof(xfs_ifork_t));
1da177e4 LT	385	return error;
1da177e4 LT	386	}