[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;
	}

	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(
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:
f0e2d93c	119	kmem_free(sxp);
35fec8df	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;
3e57ecf6 OW	131	xfs_trans_t *tp;
3e57ecf6 OW	132	xfs_bstat_t *sbp = &sxp->sx_stat;
3e57ecf6 OW	133	xfs_ifork_t tempifp, ifp, *tifp;
	134	int ilf_fields, tilf_fields;
	135	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
	136	int error = 0;
	137	int aforkblks = 0;
	138	int taforkblks = 0;
	139	__uint64_t tmp;
	140	char locked = 0;
	141
	142	mp = ip->i_mount;
	143
	144	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	145	if (!tempifp) {
	146	error = XFS_ERROR(ENOMEM);
	147	goto error0;
	148	}
	149
	150	sbp = &sxp->sx_stat;
1da177e4	151
f9114eba DC	152	/*
	153	* we have to do two separate lock calls here to keep lockdep
	154	* happy. If we try to get all the locks in one call, lock will
	155	* report false positives when we drop the ILOCK and regain them
	156	* below.
	157	*/
	158	xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
	159	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
3e57ecf6	160	locked = 1;
1da177e4	161
1da177e4 LT	162	/* Verify that both files have the same format */
	163	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	164	error = XFS_ERROR(EINVAL);
	165	goto error0;
	166	}
	167
	168	/* Verify both files are either real-time or non-realtime */
71ddabb9	169	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1da177e4 LT	170	error = XFS_ERROR(EINVAL);
	171	goto error0;
	172	}
	173
	174	/* Should never get a local format */
	175	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	176	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	177	error = XFS_ERROR(EINVAL);
	178	goto error0;
	179	}
	180
df80c933	181	if (VN_CACHED(VFS_I(tip)) != 0) {
613d7043	182	xfs_inval_cached_trace(tip, 0, -1, 0, -1);
739bfb2a CH	183	error = xfs_flushinval_pages(tip, 0, -1,
739bfb2a CH	184	FI_REMAPF_LOCKED);
d3cf2094 LM	185	if (error)
d3cf2094 LM	186	goto error0;
bd5a876a	187	}
1da177e4 LT	188
1da177e4 LT	189	/* Verify O_DIRECT for ftmp */
df80c933	190	if (VN_CACHED(VFS_I(tip)) != 0) {
1da177e4 LT	191	error = XFS_ERROR(EINVAL);
	192	goto error0;
	193	}
	194
	195	/* Verify all data are being swapped */
d0cfb373 ES	196	if (sxp->sx_offset != 0 \|\|
	197	sxp->sx_length != ip->i_d.di_size \|\|
	198	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	199	error = XFS_ERROR(EFAULT);
	200	goto error0;
	201	}
	202
	203	/*
	204	* If the target has extended attributes, the tmp file
	205	* must also in order to ensure the correct data fork
	206	* format.
	207	*/
	208	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	209	error = XFS_ERROR(EINVAL);
	210	goto error0;
	211	}
	212
	213	/*
	214	* Compare the current change & modify times with that
	215	* passed in. If they differ, we abort this swap.
	216	* This is the mechanism used to ensure the calling
	217	* process that the file was not changed out from
	218	* under it.
	219	*/
	220	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	221	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	222	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	223	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	224	error = XFS_ERROR(EBUSY);
	225	goto error0;
	226	}
	227
	228	/* We need to fail if the file is memory mapped. Once we have tossed
	229	* all existing pages, the page fault will have no option
	230	* but to go to the filesystem for pages. By making the page fault call
67fcaa73	231	* vop_read (or write in the case of autogrow) they block on the iolock
1da177e4 LT	232	* until we have switched the extents.
1da177e4 LT	233	*/
df80c933	234	if (VN_MAPPED(VFS_I(ip))) {
1da177e4 LT	235	error = XFS_ERROR(EBUSY);
	236	goto error0;
	237	}
	238
	239	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	240	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	241
	242	/*
	243	* There is a race condition here since we gave up the
	244	* ilock. However, the data fork will not change since
	245	* we have the iolock (locked for truncation too) so we
	246	* are safe. We don't really care if non-io related
	247	* fields change.
	248	*/
	249
739bfb2a	250	xfs_tosspages(ip, 0, -1, FI_REMAPF);
1da177e4 LT	251
	252	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	253	if ((error = xfs_trans_reserve(tp, 0,
	254	XFS_ICHANGE_LOG_RES(mp), 0,
	255	0, 0))) {
	256	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	257	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	258	xfs_trans_cancel(tp, 0);
d0cfb373 ES	259	locked = 0;
d0cfb373 ES	260	goto error0;
1da177e4	261	}
e1cccd91	262	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1da177e4 LT	263
	264	/*
	265	* Count the number of extended attribute blocks
	266	*/
	267	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	268	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	269	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	270	if (error) {
1da177e4	271	xfs_trans_cancel(tp, 0);
d0cfb373	272	goto error0;
1da177e4 LT	273	}
	274	}
	275	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	276	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	277	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	278	&taforkblks);
	279	if (error) {
1da177e4	280	xfs_trans_cancel(tp, 0);
d0cfb373	281	goto error0;
1da177e4 LT	282	}
	283	}
	284
	285	/*
	286	* Swap the data forks of the inodes
	287	*/
	288	ifp = &ip->i_df;
	289	tifp = &tip->i_df;
d0cfb373 ES	290	tempifp = ifp; /* struct copy */
	291	ifp = tifp; /* struct copy */
	292	tifp = tempifp; /* struct copy */
1da177e4 LT	293
	294	/*
	295	* Fix the on-disk inode values
	296	*/
	297	tmp = (__uint64_t)ip->i_d.di_nblocks;
	298	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	299	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	300
	301	tmp = (__uint64_t) ip->i_d.di_nextents;
	302	ip->i_d.di_nextents = tip->i_d.di_nextents;
	303	tip->i_d.di_nextents = tmp;
	304
	305	tmp = (__uint64_t) ip->i_d.di_format;
	306	ip->i_d.di_format = tip->i_d.di_format;
	307	tip->i_d.di_format = tmp;
	308
	309	ilf_fields = XFS_ILOG_CORE;
	310
	311	switch(ip->i_d.di_format) {
	312	case XFS_DINODE_FMT_EXTENTS:
	313	/* If the extents fit in the inode, fix the
	314	* pointer. Otherwise it's already NULL or
	315	* pointing to the extent.
	316	*/
	317	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	318	ifp->if_u1.if_extents =
	319	ifp->if_u2.if_inline_ext;
	320	}
	321	ilf_fields \|= XFS_ILOG_DEXT;
	322	break;
	323	case XFS_DINODE_FMT_BTREE:
	324	ilf_fields \|= XFS_ILOG_DBROOT;
	325	break;
	326	}
	327
	328	tilf_fields = XFS_ILOG_CORE;
	329
	330	switch(tip->i_d.di_format) {
	331	case XFS_DINODE_FMT_EXTENTS:
	332	/* If the extents fit in the inode, fix the
	333	* pointer. Otherwise it's already NULL or
	334	* pointing to the extent.
	335	*/
	336	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	337	tifp->if_u1.if_extents =
	338	tifp->if_u2.if_inline_ext;
	339	}
	340	tilf_fields \|= XFS_ILOG_DEXT;
	341	break;
	342	case XFS_DINODE_FMT_BTREE:
	343	tilf_fields \|= XFS_ILOG_DBROOT;
	344	break;
	345	}
	346
1da177e4	347
0b1f9177	348	IHOLD(ip);
1da177e4	349	xfs_trans_ijoin(tp, ip, lock_flags);
0b1f9177 CH	350
0b1f9177 CH	351	IHOLD(tip);
1da177e4 LT	352	xfs_trans_ijoin(tp, tip, lock_flags);
	353
	354	xfs_trans_log_inode(tp, ip, ilf_fields);
	355	xfs_trans_log_inode(tp, tip, tilf_fields);
	356
	357	/*
	358	* If this is a synchronous mount, make sure that the
	359	* transaction goes to disk before returning to the user.
	360	*/
	361	if (mp->m_flags & XFS_MOUNT_WSYNC) {
	362	xfs_trans_set_sync(tp);
	363	}
	364
1c72bf90	365	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
d0cfb373	366	locked = 0;
1da177e4 LT	367
	368	error0:
	369	if (locked) {
	370	xfs_iunlock(ip, lock_flags);
	371	xfs_iunlock(tip, lock_flags);
	372	}
d0cfb373	373	if (tempifp != NULL)
f0e2d93c	374	kmem_free(tempifp);
1da177e4 LT	375	return error;
1da177e4 LT	376	}