[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"
#include "xfs_trace.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;

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

	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;
	}

	if (IS_SWAPFILE(file->f_path.dentry->d_inode) ||
	    IS_SWAPFILE(target_file->f_path.dentry->d_inode)) {
		error = XFS_ERROR(EINVAL);
		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:
	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;
	int		error = 0;
	int		aforkblks = 0;
	int		taforkblks = 0;
	__uint64_t	tmp;

	mp = ip->i_mount;

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

	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);

	/* 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 out_unlock;
	}

	/* 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 out_unlock;
	}

	/* 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 out_unlock;
	}

	if (VN_CACHED(VFS_I(tip)) != 0) {
		error = xfs_flushinval_pages(tip, 0, -1,
				FI_REMAPF_LOCKED);
		if (error)
			goto out_unlock;
	}

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

	/* 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 out_unlock;
	}

	/*
	 * 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 out_unlock;
	}

	/*
	 * 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 != VFS_I(ip)->i_ctime.tv_sec) ||
	    (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) ||
	    (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) ||
	    (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
		error = XFS_ERROR(EBUSY);
		goto out_unlock;
	}

	/* 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 out_unlock;
	}

	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);
		goto out;
	}
	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)
			goto out_trans_cancel;
	}
	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)
			goto out_trans_cancel;
	}

	/*
	 * 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, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);

	IHOLD(tip);
	xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);

	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);

out:
	kmem_free(tempifp);
	return error;

out_unlock:
	xfs_iunlock(ip,  XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
	xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
	goto out;

out_trans_cancel:
	xfs_trans_cancel(tp, 0);
	goto out_unlock;
}
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"
0b1b213f	46	#include "xfs_trace.h"
1da177e4 LT	47
	48	/*
	49	* Syssgi interface for swapext
	50	*/
	51	int
	52	xfs_swapext(
743bb465	53	xfs_swapext_t *sxp)
1da177e4	54	{
35fec8df CH	55	xfs_inode_t ip, tip;
35fec8df CH	56	struct file file, target_file;
1da177e4	57	int error = 0;
1da177e4	58
1da177e4	59	/* Pull information for the target fd */
35fec8df CH	60	file = fget((int)sxp->sx_fdtarget);
35fec8df CH	61	if (!file) {
1da177e4	62	error = XFS_ERROR(EINVAL);
ac12b4e2	63	goto out;
1da177e4 LT	64	}
1da177e4 LT	65
f6aa7f21 CH	66	if (!(file->f_mode & FMODE_WRITE) \|\| (file->f_flags & O_APPEND)) {
	67	error = XFS_ERROR(EBADF);
	68	goto out_put_file;
	69	}
	70
35fec8df CH	71	target_file = fget((int)sxp->sx_fdtmp);
35fec8df CH	72	if (!target_file) {
1da177e4	73	error = XFS_ERROR(EINVAL);
35fec8df	74	goto out_put_file;
1da177e4 LT	75	}
1da177e4 LT	76
f6aa7f21 CH	77	if (!(target_file->f_mode & FMODE_WRITE) \|\|
	78	(target_file->f_flags & O_APPEND)) {
	79	error = XFS_ERROR(EBADF);
	80	goto out_put_target_file;
	81	}
	82
7c8f7af6 CH	83	if (IS_SWAPFILE(file->f_path.dentry->d_inode) \|\|
	84	IS_SWAPFILE(target_file->f_path.dentry->d_inode)) {
	85	error = XFS_ERROR(EINVAL);
	86	goto out_put_target_file;
	87	}
	88
35fec8df CH	89	ip = XFS_I(file->f_path.dentry->d_inode);
35fec8df CH	90	tip = XFS_I(target_file->f_path.dentry->d_inode);
1da177e4 LT	91
1da177e4 LT	92	if (ip->i_mount != tip->i_mount) {
35fec8df CH	93	error = XFS_ERROR(EINVAL);
35fec8df CH	94	goto out_put_target_file;
1da177e4 LT	95	}
	96
	97	if (ip->i_ino == tip->i_ino) {
35fec8df CH	98	error = XFS_ERROR(EINVAL);
35fec8df CH	99	goto out_put_target_file;
1da177e4 LT	100	}
1da177e4 LT	101
35fec8df CH	102	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
	103	error = XFS_ERROR(EIO);
	104	goto out_put_target_file;
1da177e4 LT	105	}
1da177e4 LT	106
541d7d3c	107	error = xfs_swap_extents(ip, tip, sxp);
3e57ecf6	108
35fec8df CH	109	out_put_target_file:
	110	fput(target_file);
	111	out_put_file:
	112	fput(file);
35fec8df	113	out:
3e57ecf6 OW	114	return error;
	115	}
	116
	117	int
	118	xfs_swap_extents(
	119	xfs_inode_t *ip,
	120	xfs_inode_t *tip,
	121	xfs_swapext_t *sxp)
	122	{
	123	xfs_mount_t *mp;
3e57ecf6 OW	124	xfs_trans_t *tp;
3e57ecf6 OW	125	xfs_bstat_t *sbp = &sxp->sx_stat;
3e57ecf6 OW	126	xfs_ifork_t tempifp, ifp, *tifp;
3e57ecf6 OW	127	int ilf_fields, tilf_fields;
3e57ecf6 OW	128	int error = 0;
	129	int aforkblks = 0;
	130	int taforkblks = 0;
	131	__uint64_t tmp;
3e57ecf6 OW	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);
ef8f7fc5	138	goto out;
3e57ecf6 OW	139	}
	140
	141	sbp = &sxp->sx_stat;
1da177e4	142
f9114eba DC	143	/*
	144	* we have to do two separate lock calls here to keep lockdep
	145	* happy. If we try to get all the locks in one call, lock will
	146	* report false positives when we drop the ILOCK and regain them
	147	* below.
	148	*/
	149	xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
	150	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1da177e4	151
1da177e4 LT	152	/* Verify that both files have the same format */
	153	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	154	error = XFS_ERROR(EINVAL);
ef8f7fc5	155	goto out_unlock;
1da177e4 LT	156	}
	157
	158	/* Verify both files are either real-time or non-realtime */
71ddabb9	159	if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1da177e4	160	error = XFS_ERROR(EINVAL);
ef8f7fc5	161	goto out_unlock;
1da177e4 LT	162	}
	163
	164	/* Should never get a local format */
	165	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	166	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	167	error = XFS_ERROR(EINVAL);
ef8f7fc5	168	goto out_unlock;
1da177e4 LT	169	}
1da177e4 LT	170
df80c933	171	if (VN_CACHED(VFS_I(tip)) != 0) {
739bfb2a CH	172	error = xfs_flushinval_pages(tip, 0, -1,
739bfb2a CH	173	FI_REMAPF_LOCKED);
d3cf2094	174	if (error)
ef8f7fc5	175	goto out_unlock;
bd5a876a	176	}
1da177e4 LT	177
1da177e4 LT	178	/* Verify O_DIRECT for ftmp */
df80c933	179	if (VN_CACHED(VFS_I(tip)) != 0) {
1da177e4	180	error = XFS_ERROR(EINVAL);
ef8f7fc5	181	goto out_unlock;
1da177e4 LT	182	}
	183
	184	/* Verify all data are being swapped */
d0cfb373 ES	185	if (sxp->sx_offset != 0 \|\|
	186	sxp->sx_length != ip->i_d.di_size \|\|
	187	sxp->sx_length != tip->i_d.di_size) {
1da177e4	188	error = XFS_ERROR(EFAULT);
ef8f7fc5	189	goto out_unlock;
1da177e4 LT	190	}
	191
	192	/*
	193	* If the target has extended attributes, the tmp file
	194	* must also in order to ensure the correct data fork
	195	* format.
	196	*/
	197	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	198	error = XFS_ERROR(EINVAL);
ef8f7fc5	199	goto out_unlock;
1da177e4 LT	200	}
	201
	202	/*
	203	* Compare the current change & modify times with that
	204	* passed in. If they differ, we abort this swap.
	205	* This is the mechanism used to ensure the calling
	206	* process that the file was not changed out from
	207	* under it.
	208	*/
f9581b14 CH	209	if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) \|\|
	210	(sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) \|\|
	211	(sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) \|\|
	212	(sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
1da177e4	213	error = XFS_ERROR(EBUSY);
ef8f7fc5	214	goto out_unlock;
1da177e4 LT	215	}
	216
	217	/* We need to fail if the file is memory mapped. Once we have tossed
	218	* all existing pages, the page fault will have no option
	219	* but to go to the filesystem for pages. By making the page fault call
67fcaa73	220	* vop_read (or write in the case of autogrow) they block on the iolock
1da177e4 LT	221	* until we have switched the extents.
1da177e4 LT	222	*/
df80c933	223	if (VN_MAPPED(VFS_I(ip))) {
1da177e4	224	error = XFS_ERROR(EBUSY);
ef8f7fc5	225	goto out_unlock;
1da177e4 LT	226	}
	227
	228	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	229	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	230
	231	/*
	232	* There is a race condition here since we gave up the
	233	* ilock. However, the data fork will not change since
	234	* we have the iolock (locked for truncation too) so we
	235	* are safe. We don't really care if non-io related
	236	* fields change.
	237	*/
	238
739bfb2a	239	xfs_tosspages(ip, 0, -1, FI_REMAPF);
1da177e4 LT	240
	241	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	242	if ((error = xfs_trans_reserve(tp, 0,
	243	XFS_ICHANGE_LOG_RES(mp), 0,
	244	0, 0))) {
	245	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	246	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	247	xfs_trans_cancel(tp, 0);
ef8f7fc5	248	goto out;
1da177e4	249	}
e1cccd91	250	xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1da177e4 LT	251
	252	/*
	253	* Count the number of extended attribute blocks
	254	*/
	255	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	256	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	257	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
ef8f7fc5 JJS	258	if (error)
ef8f7fc5 JJS	259	goto out_trans_cancel;
1da177e4 LT	260	}
	261	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	262	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	263	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	264	&taforkblks);
ef8f7fc5 JJS	265	if (error)
ef8f7fc5 JJS	266	goto out_trans_cancel;
1da177e4 LT	267	}
	268
	269	/*
	270	* Swap the data forks of the inodes
	271	*/
	272	ifp = &ip->i_df;
	273	tifp = &tip->i_df;
d0cfb373 ES	274	tempifp = ifp; /* struct copy */
	275	ifp = tifp; /* struct copy */
	276	tifp = tempifp; /* struct copy */
1da177e4 LT	277
	278	/*
	279	* Fix the on-disk inode values
	280	*/
	281	tmp = (__uint64_t)ip->i_d.di_nblocks;
	282	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	283	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	284
	285	tmp = (__uint64_t) ip->i_d.di_nextents;
	286	ip->i_d.di_nextents = tip->i_d.di_nextents;
	287	tip->i_d.di_nextents = tmp;
	288
	289	tmp = (__uint64_t) ip->i_d.di_format;
	290	ip->i_d.di_format = tip->i_d.di_format;
	291	tip->i_d.di_format = tmp;
	292
	293	ilf_fields = XFS_ILOG_CORE;
	294
	295	switch(ip->i_d.di_format) {
	296	case XFS_DINODE_FMT_EXTENTS:
	297	/* If the extents fit in the inode, fix the
	298	* pointer. Otherwise it's already NULL or
	299	* pointing to the extent.
	300	*/
	301	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	302	ifp->if_u1.if_extents =
	303	ifp->if_u2.if_inline_ext;
	304	}
	305	ilf_fields \|= XFS_ILOG_DEXT;
	306	break;
	307	case XFS_DINODE_FMT_BTREE:
	308	ilf_fields \|= XFS_ILOG_DBROOT;
	309	break;
	310	}
	311
	312	tilf_fields = XFS_ILOG_CORE;
	313
	314	switch(tip->i_d.di_format) {
	315	case XFS_DINODE_FMT_EXTENTS:
	316	/* If the extents fit in the inode, fix the
	317	* pointer. Otherwise it's already NULL or
	318	* pointing to the extent.
	319	*/
	320	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	321	tifp->if_u1.if_extents =
	322	tifp->if_u2.if_inline_ext;
	323	}
	324	tilf_fields \|= XFS_ILOG_DEXT;
	325	break;
	326	case XFS_DINODE_FMT_BTREE:
	327	tilf_fields \|= XFS_ILOG_DBROOT;
	328	break;
	329	}
	330
1da177e4	331
0b1f9177	332	IHOLD(ip);
ef8f7fc5	333	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL);
0b1f9177 CH	334
0b1f9177 CH	335	IHOLD(tip);
ef8f7fc5	336	xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL);
1da177e4 LT	337
	338	xfs_trans_log_inode(tp, ip, ilf_fields);
	339	xfs_trans_log_inode(tp, tip, tilf_fields);
	340
	341	/*
	342	* If this is a synchronous mount, make sure that the
	343	* transaction goes to disk before returning to the user.
	344	*/
ef8f7fc5	345	if (mp->m_flags & XFS_MOUNT_WSYNC)
1da177e4	346	xfs_trans_set_sync(tp);
1da177e4	347
1c72bf90	348	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
1da177e4	349
ef8f7fc5 JJS	350	out:
ef8f7fc5 JJS	351	kmem_free(tempifp);
1da177e4	352	return error;
ef8f7fc5	353
1f23920d FB	354	out_unlock:
	355	xfs_iunlock(ip, XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL);
	356	xfs_iunlock(tip, XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL);
	357	goto out;
	358
ef8f7fc5 JJS	359	out_trans_cancel:
	360	xfs_trans_cancel(tp, 0);
	361	goto out_unlock;
1da177e4	362	}