[net-next-2.6.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	*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;
	}

	/* 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);
 out:
	return error;
}

int
xfs_swap_extents(
	xfs_inode_t	*ip,
	xfs_inode_t	*tip,
	xfs_swapext_t	*sxp)
{
	xfs_mount_t	*mp;
	xfs_trans_t	*tp;
	xfs_bstat_t	*sbp = &sxp->sx_stat;
	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;

	/*
	 * we have to do two separate lock calls here to keep lockdep
	 * happy. If we try to get all the locks in one call, lock will
	 * report false positives when we drop the ILOCK and regain them
	 * below.
	 */
	xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
	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(VFS_I(tip)) != 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(VFS_I(tip)) != 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(VFS_I(ip))) {
		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_two_inodes(ip, tip, 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;
	}


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

	IHOLD(tip);
	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);
	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(
743bb465	52	xfs_swapext_t *sxp)
1da177e4	53	{
35fec8df CH	54	xfs_inode_t ip, tip;
35fec8df CH	55	struct file file, target_file;
1da177e4	56	int error = 0;
1da177e4	57
d0cfb373	58	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
3e57ecf6	59	if (!sxp) {
d0cfb373	60	error = XFS_ERROR(ENOMEM);
35fec8df	61	goto out;
d0cfb373 ES	62	}
d0cfb373 ES	63
1da177e4	64	/* Pull information for the target fd */
35fec8df CH	65	file = fget((int)sxp->sx_fdtarget);
35fec8df CH	66	if (!file) {
1da177e4	67	error = XFS_ERROR(EINVAL);
35fec8df	68	goto out_free_sxp;
1da177e4 LT	69	}
1da177e4 LT	70
f6aa7f21 CH	71	if (!(file->f_mode & FMODE_WRITE) \|\| (file->f_flags & O_APPEND)) {
	72	error = XFS_ERROR(EBADF);
	73	goto out_put_file;
	74	}
	75
35fec8df CH	76	target_file = fget((int)sxp->sx_fdtmp);
35fec8df CH	77	if (!target_file) {
1da177e4	78	error = XFS_ERROR(EINVAL);
35fec8df	79	goto out_put_file;
1da177e4 LT	80	}
1da177e4 LT	81
f6aa7f21 CH	82	if (!(target_file->f_mode & FMODE_WRITE) \|\|
	83	(target_file->f_flags & O_APPEND)) {
	84	error = XFS_ERROR(EBADF);
	85	goto out_put_target_file;
	86	}
	87
35fec8df CH	88	ip = XFS_I(file->f_path.dentry->d_inode);
35fec8df CH	89	tip = XFS_I(target_file->f_path.dentry->d_inode);
1da177e4 LT	90
1da177e4 LT	91	if (ip->i_mount != tip->i_mount) {
35fec8df CH	92	error = XFS_ERROR(EINVAL);
35fec8df CH	93	goto out_put_target_file;
1da177e4 LT	94	}
	95
	96	if (ip->i_ino == tip->i_ino) {
35fec8df CH	97	error = XFS_ERROR(EINVAL);
35fec8df CH	98	goto out_put_target_file;
1da177e4 LT	99	}
1da177e4 LT	100
35fec8df CH	101	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
	102	error = XFS_ERROR(EIO);
	103	goto out_put_target_file;
1da177e4 LT	104	}
1da177e4 LT	105
541d7d3c	106	error = xfs_swap_extents(ip, tip, sxp);
3e57ecf6	107
35fec8df CH	108	out_put_target_file:
	109	fput(target_file);
	110	out_put_file:
	111	fput(file);
	112	out_free_sxp:
f0e2d93c	113	kmem_free(sxp);
35fec8df	114	out:
3e57ecf6 OW	115	return error;
	116	}
	117
	118	int
	119	xfs_swap_extents(
	120	xfs_inode_t *ip,
	121	xfs_inode_t *tip,
	122	xfs_swapext_t *sxp)
	123	{
	124	xfs_mount_t *mp;
3e57ecf6 OW	125	xfs_trans_t *tp;
3e57ecf6 OW	126	xfs_bstat_t *sbp = &sxp->sx_stat;
3e57ecf6 OW	127	xfs_ifork_t tempifp, ifp, *tifp;
	128	int ilf_fields, tilf_fields;
	129	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
	130	int error = 0;
	131	int aforkblks = 0;
	132	int taforkblks = 0;
	133	__uint64_t tmp;
	134	char locked = 0;
	135
	136	mp = ip->i_mount;
	137
	138	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	139	if (!tempifp) {
	140	error = XFS_ERROR(ENOMEM);
	141	goto error0;
	142	}
	143
	144	sbp = &sxp->sx_stat;
1da177e4	145
f9114eba DC	146	/*
	147	* we have to do two separate lock calls here to keep lockdep
	148	* happy. If we try to get all the locks in one call, lock will
	149	* report false positives when we drop the ILOCK and regain them
	150	* below.
	151	*/
	152	xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
	153	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
3e57ecf6	154	locked = 1;
1da177e4	155
1da177e4 LT	156	/* Verify that both files have the same format */
	157	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	158	error = XFS_ERROR(EINVAL);
	159	goto error0;
	160	}
	161
	162	/* Verify both files are either real-time or non-realtime */
71ddabb9	163	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1da177e4 LT	164	error = XFS_ERROR(EINVAL);
	165	goto error0;
	166	}
	167
	168	/* Should never get a local format */
	169	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	170	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	171	error = XFS_ERROR(EINVAL);
	172	goto error0;
	173	}
	174
df80c933	175	if (VN_CACHED(VFS_I(tip)) != 0) {
613d7043	176	xfs_inval_cached_trace(tip, 0, -1, 0, -1);
739bfb2a CH	177	error = xfs_flushinval_pages(tip, 0, -1,
739bfb2a CH	178	FI_REMAPF_LOCKED);
d3cf2094 LM	179	if (error)
d3cf2094 LM	180	goto error0;
bd5a876a	181	}
1da177e4 LT	182
1da177e4 LT	183	/* Verify O_DIRECT for ftmp */
df80c933	184	if (VN_CACHED(VFS_I(tip)) != 0) {
1da177e4 LT	185	error = XFS_ERROR(EINVAL);
	186	goto error0;
	187	}
	188
	189	/* Verify all data are being swapped */
d0cfb373 ES	190	if (sxp->sx_offset != 0 \|\|
	191	sxp->sx_length != ip->i_d.di_size \|\|
	192	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	193	error = XFS_ERROR(EFAULT);
	194	goto error0;
	195	}
	196
	197	/*
	198	* If the target has extended attributes, the tmp file
	199	* must also in order to ensure the correct data fork
	200	* format.
	201	*/
	202	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	203	error = XFS_ERROR(EINVAL);
	204	goto error0;
	205	}
	206
	207	/*
	208	* Compare the current change & modify times with that
	209	* passed in. If they differ, we abort this swap.
	210	* This is the mechanism used to ensure the calling
	211	* process that the file was not changed out from
	212	* under it.
	213	*/
	214	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	215	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	216	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	217	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	218	error = XFS_ERROR(EBUSY);
	219	goto error0;
	220	}
	221
	222	/* We need to fail if the file is memory mapped. Once we have tossed
	223	* all existing pages, the page fault will have no option
	224	* but to go to the filesystem for pages. By making the page fault call
67fcaa73	225	* vop_read (or write in the case of autogrow) they block on the iolock
1da177e4 LT	226	* until we have switched the extents.
1da177e4 LT	227	*/
df80c933	228	if (VN_MAPPED(VFS_I(ip))) {
1da177e4 LT	229	error = XFS_ERROR(EBUSY);
	230	goto error0;
	231	}
	232
	233	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	234	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	235
	236	/*
	237	* There is a race condition here since we gave up the
	238	* ilock. However, the data fork will not change since
	239	* we have the iolock (locked for truncation too) so we
	240	* are safe. We don't really care if non-io related
	241	* fields change.
	242	*/
	243
739bfb2a	244	xfs_tosspages(ip, 0, -1, FI_REMAPF);
1da177e4 LT	245
	246	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	247	if ((error = xfs_trans_reserve(tp, 0,
	248	XFS_ICHANGE_LOG_RES(mp), 0,
	249	0, 0))) {
	250	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	251	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	252	xfs_trans_cancel(tp, 0);
d0cfb373 ES	253	locked = 0;
d0cfb373 ES	254	goto error0;
1da177e4	255	}
e1cccd91	256	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1da177e4 LT	257
	258	/*
	259	* Count the number of extended attribute blocks
	260	*/
	261	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	262	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	263	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	264	if (error) {
1da177e4	265	xfs_trans_cancel(tp, 0);
d0cfb373	266	goto error0;
1da177e4 LT	267	}
	268	}
	269	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	270	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	271	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	272	&taforkblks);
	273	if (error) {
1da177e4	274	xfs_trans_cancel(tp, 0);
d0cfb373	275	goto error0;
1da177e4 LT	276	}
	277	}
	278
	279	/*
	280	* Swap the data forks of the inodes
	281	*/
	282	ifp = &ip->i_df;
	283	tifp = &tip->i_df;
d0cfb373 ES	284	tempifp = ifp; /* struct copy */
	285	ifp = tifp; /* struct copy */
	286	tifp = tempifp; /* struct copy */
1da177e4 LT	287
	288	/*
	289	* Fix the on-disk inode values
	290	*/
	291	tmp = (__uint64_t)ip->i_d.di_nblocks;
	292	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	293	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	294
	295	tmp = (__uint64_t) ip->i_d.di_nextents;
	296	ip->i_d.di_nextents = tip->i_d.di_nextents;
	297	tip->i_d.di_nextents = tmp;
	298
	299	tmp = (__uint64_t) ip->i_d.di_format;
	300	ip->i_d.di_format = tip->i_d.di_format;
	301	tip->i_d.di_format = tmp;
	302
	303	ilf_fields = XFS_ILOG_CORE;
	304
	305	switch(ip->i_d.di_format) {
	306	case XFS_DINODE_FMT_EXTENTS:
	307	/* If the extents fit in the inode, fix the
	308	* pointer. Otherwise it's already NULL or
	309	* pointing to the extent.
	310	*/
	311	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	312	ifp->if_u1.if_extents =
	313	ifp->if_u2.if_inline_ext;
	314	}
	315	ilf_fields \|= XFS_ILOG_DEXT;
	316	break;
	317	case XFS_DINODE_FMT_BTREE:
	318	ilf_fields \|= XFS_ILOG_DBROOT;
	319	break;
	320	}
	321
	322	tilf_fields = XFS_ILOG_CORE;
	323
	324	switch(tip->i_d.di_format) {
	325	case XFS_DINODE_FMT_EXTENTS:
	326	/* If the extents fit in the inode, fix the
	327	* pointer. Otherwise it's already NULL or
	328	* pointing to the extent.
	329	*/
	330	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	331	tifp->if_u1.if_extents =
	332	tifp->if_u2.if_inline_ext;
	333	}
	334	tilf_fields \|= XFS_ILOG_DEXT;
	335	break;
	336	case XFS_DINODE_FMT_BTREE:
	337	tilf_fields \|= XFS_ILOG_DBROOT;
	338	break;
	339	}
	340
1da177e4	341
0b1f9177	342	IHOLD(ip);
1da177e4	343	xfs_trans_ijoin(tp, ip, lock_flags);
0b1f9177 CH	344
0b1f9177 CH	345	IHOLD(tip);
1da177e4 LT	346	xfs_trans_ijoin(tp, tip, lock_flags);
	347
	348	xfs_trans_log_inode(tp, ip, ilf_fields);
	349	xfs_trans_log_inode(tp, tip, tilf_fields);
	350
	351	/*
	352	* If this is a synchronous mount, make sure that the
	353	* transaction goes to disk before returning to the user.
	354	*/
	355	if (mp->m_flags & XFS_MOUNT_WSYNC) {
	356	xfs_trans_set_sync(tp);
	357	}
	358
1c72bf90	359	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
d0cfb373	360	locked = 0;
1da177e4 LT	361
	362	error0:
	363	if (locked) {
	364	xfs_iunlock(ip, lock_flags);
	365	xfs_iunlock(tip, lock_flags);
	366	}
d0cfb373	367	if (tempifp != NULL)
f0e2d93c	368	kmem_free(tempifp);
1da177e4 LT	369	return error;
1da177e4 LT	370	}