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

/*
 * Copyright (c) 2000-2002,2005 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_dir.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_dir_sf.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_mac.h"
#include "xfs_rw.h"

/*
 * Syssgi interface for swapext
 */
int
xfs_swapext(
	xfs_swapext_t	__user *sxu)
{
	xfs_swapext_t	*sxp;
	xfs_inode_t     *ip=NULL, *tip=NULL, *ips[2];
	xfs_trans_t     *tp;
	xfs_mount_t     *mp;
	xfs_bstat_t	*sbp;
	struct file	*fp = NULL, *tfp = NULL;
	vnode_t		*vp, *tvp;
	static uint	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
	int		ilf_fields, tilf_fields;
	int		error = 0;
	xfs_ifork_t	*tempifp, *ifp, *tifp;
	__uint64_t	tmp;
	int		aforkblks = 0;
	int		taforkblks = 0;
	char		locked = 0;

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

	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
		error = XFS_ERROR(EFAULT);
		goto error0;
	}

	/* Pull information for the target fd */
	if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) ||
	    ((vp = vn_from_inode(fp->f_dentry->d_inode)) == NULL))  {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	ip = xfs_vtoi(vp);
	if (ip == NULL) {
		error = XFS_ERROR(EBADF);
		goto error0;
	}

	if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
	    ((tvp = vn_from_inode(tfp->f_dentry->d_inode)) == NULL)) {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	tip = xfs_vtoi(tvp);
	if (tip == NULL) {
		error = XFS_ERROR(EBADF);
		goto error0;
	}

	if (ip->i_mount != tip->i_mount) {
		error =  XFS_ERROR(EINVAL);
		goto error0;
	}

	if (ip->i_ino == tip->i_ino) {
		error =  XFS_ERROR(EINVAL);
		goto error0;
	}

	mp = ip->i_mount;

	sbp = &sxp->sx_stat;

	if (XFS_FORCED_SHUTDOWN(mp)) {
		error =  XFS_ERROR(EIO);
		goto error0;
	}

	locked = 1;

	/* 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);

	/* 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 ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
	    (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
		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->i_iocore, 0, -1, 0, -1);
		VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
	}

	/* 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.
	 */

	VOP_TOSS_PAGES(vp, 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, NULL);
	locked = 0;

 error0:
	if (locked) {
		xfs_iunlock(ip,  lock_flags);
		xfs_iunlock(tip, lock_flags);
	}

	if (fp != NULL)
		fput(fp);
	if (tfp != NULL)
		fput(tfp);

	if (sxp != NULL)
		kmem_free(sxp, sizeof(xfs_swapext_t));
	if (tempifp != NULL)
		kmem_free(tempifp, sizeof(xfs_ifork_t));

	return error;
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
7b718769 NS	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_dir.h"
	28	#include "xfs_dir2.h"
	29	#include "xfs_dmapi.h"
	30	#include "xfs_mount.h"
1da177e4	31	#include "xfs_bmap_btree.h"
a844f451	32	#include "xfs_alloc_btree.h"
1da177e4	33	#include "xfs_ialloc_btree.h"
1da177e4 LT	34	#include "xfs_dir_sf.h"
1da177e4 LT	35	#include "xfs_dir2_sf.h"
a844f451	36	#include "xfs_attr_sf.h"
1da177e4	37	#include "xfs_dinode.h"
1da177e4	38	#include "xfs_inode.h"
a844f451	39	#include "xfs_inode_item.h"
1da177e4	40	#include "xfs_bmap.h"
a844f451	41	#include "xfs_btree.h"
1da177e4 LT	42	#include "xfs_ialloc.h"
	43	#include "xfs_itable.h"
	44	#include "xfs_dfrag.h"
	45	#include "xfs_error.h"
	46	#include "xfs_mac.h"
	47	#include "xfs_rw.h"
	48
	49	/*
	50	* Syssgi interface for swapext
	51	*/
	52	int
	53	xfs_swapext(
d0cfb373	54	xfs_swapext_t __user *sxu)
1da177e4	55	{
d0cfb373	56	xfs_swapext_t *sxp;
1da177e4 LT	57	xfs_inode_t ip=NULL, tip=NULL, *ips[2];
	58	xfs_trans_t *tp;
	59	xfs_mount_t *mp;
	60	xfs_bstat_t *sbp;
	61	struct file fp = NULL, tfp = NULL;
	62	vnode_t vp, tvp;
d0cfb373	63	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
1da177e4 LT	64	int ilf_fields, tilf_fields;
1da177e4 LT	65	int error = 0;
d0cfb373	66	xfs_ifork_t tempifp, ifp, *tifp;
1da177e4 LT	67	__uint64_t tmp;
	68	int aforkblks = 0;
	69	int taforkblks = 0;
d0cfb373	70	char locked = 0;
1da177e4	71
d0cfb373 ES	72	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
	73	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	74	if (!sxp \|\| !tempifp) {
	75	error = XFS_ERROR(ENOMEM);
	76	goto error0;
	77	}
	78
	79	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
	80	error = XFS_ERROR(EFAULT);
	81	goto error0;
	82	}
1da177e4 LT	83
1da177e4 LT	84	/* Pull information for the target fd */
d0cfb373	85	if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) \|\|
ec86dc02	86	((vp = vn_from_inode(fp->f_dentry->d_inode)) == NULL)) {
1da177e4 LT	87	error = XFS_ERROR(EINVAL);
	88	goto error0;
	89	}
	90
75e17b3c CH	91	ip = xfs_vtoi(vp);
75e17b3c CH	92	if (ip == NULL) {
1da177e4 LT	93	error = XFS_ERROR(EBADF);
1da177e4 LT	94	goto error0;
1da177e4 LT	95	}
1da177e4 LT	96
d0cfb373	97	if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) \|\|
ec86dc02	98	((tvp = vn_from_inode(tfp->f_dentry->d_inode)) == NULL)) {
1da177e4 LT	99	error = XFS_ERROR(EINVAL);
	100	goto error0;
	101	}
	102
75e17b3c CH	103	tip = xfs_vtoi(tvp);
75e17b3c CH	104	if (tip == NULL) {
1da177e4 LT	105	error = XFS_ERROR(EBADF);
1da177e4 LT	106	goto error0;
1da177e4 LT	107	}
	108
	109	if (ip->i_mount != tip->i_mount) {
	110	error = XFS_ERROR(EINVAL);
	111	goto error0;
	112	}
	113
	114	if (ip->i_ino == tip->i_ino) {
	115	error = XFS_ERROR(EINVAL);
	116	goto error0;
	117	}
	118
	119	mp = ip->i_mount;
	120
d0cfb373	121	sbp = &sxp->sx_stat;
1da177e4 LT	122
	123	if (XFS_FORCED_SHUTDOWN(mp)) {
	124	error = XFS_ERROR(EIO);
	125	goto error0;
	126	}
	127
	128	locked = 1;
	129
	130	/* Lock in i_ino order */
	131	if (ip->i_ino < tip->i_ino) {
	132	ips[0] = ip;
	133	ips[1] = tip;
	134	} else {
	135	ips[0] = tip;
	136	ips[1] = ip;
	137	}
d0cfb373	138
1da177e4 LT	139	xfs_lock_inodes(ips, 2, 0, lock_flags);
	140
	141	/* Check permissions */
	142	error = xfs_iaccess(ip, S_IWUSR, NULL);
	143	if (error)
	144	goto error0;
	145
	146	error = xfs_iaccess(tip, S_IWUSR, NULL);
	147	if (error)
	148	goto error0;
	149
	150	/* Verify that both files have the same format */
	151	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	152	error = XFS_ERROR(EINVAL);
	153	goto error0;
	154	}
	155
	156	/* Verify both files are either real-time or non-realtime */
	157	if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
	158	(tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
	159	error = XFS_ERROR(EINVAL);
	160	goto error0;
	161	}
	162
	163	/* Should never get a local format */
	164	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	165	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	166	error = XFS_ERROR(EINVAL);
	167	goto error0;
	168	}
	169
bd5a876a CH	170	if (VN_CACHED(tvp) != 0) {
	171	xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
	172	VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
	173	}
1da177e4 LT	174
	175	/* Verify O_DIRECT for ftmp */
	176	if (VN_CACHED(tvp) != 0) {
	177	error = XFS_ERROR(EINVAL);
	178	goto error0;
	179	}
	180
	181	/* Verify all data are being swapped */
d0cfb373 ES	182	if (sxp->sx_offset != 0 \|\|
	183	sxp->sx_length != ip->i_d.di_size \|\|
	184	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	185	error = XFS_ERROR(EFAULT);
	186	goto error0;
	187	}
	188
	189	/*
	190	* If the target has extended attributes, the tmp file
	191	* must also in order to ensure the correct data fork
	192	* format.
	193	*/
	194	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	195	error = XFS_ERROR(EINVAL);
	196	goto error0;
	197	}
	198
	199	/*
	200	* Compare the current change & modify times with that
	201	* passed in. If they differ, we abort this swap.
	202	* This is the mechanism used to ensure the calling
	203	* process that the file was not changed out from
	204	* under it.
	205	*/
	206	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	207	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	208	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	209	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	210	error = XFS_ERROR(EBUSY);
	211	goto error0;
	212	}
	213
	214	/* We need to fail if the file is memory mapped. Once we have tossed
	215	* all existing pages, the page fault will have no option
	216	* but to go to the filesystem for pages. By making the page fault call
	217	* VOP_READ (or write in the case of autogrow) they block on the iolock
	218	* until we have switched the extents.
	219	*/
	220	if (VN_MAPPED(vp)) {
	221	error = XFS_ERROR(EBUSY);
	222	goto error0;
	223	}
	224
	225	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	226	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	227
	228	/*
	229	* There is a race condition here since we gave up the
	230	* ilock. However, the data fork will not change since
	231	* we have the iolock (locked for truncation too) so we
	232	* are safe. We don't really care if non-io related
	233	* fields change.
	234	*/
	235
	236	VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
	237
	238	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	239	if ((error = xfs_trans_reserve(tp, 0,
	240	XFS_ICHANGE_LOG_RES(mp), 0,
	241	0, 0))) {
	242	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	243	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	244	xfs_trans_cancel(tp, 0);
d0cfb373 ES	245	locked = 0;
d0cfb373 ES	246	goto error0;
1da177e4 LT	247	}
	248	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
	249
	250	/*
	251	* Count the number of extended attribute blocks
	252	*/
	253	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	254	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	255	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	256	if (error) {
1da177e4	257	xfs_trans_cancel(tp, 0);
d0cfb373	258	goto error0;
1da177e4 LT	259	}
	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);
	265	if (error) {
1da177e4	266	xfs_trans_cancel(tp, 0);
d0cfb373	267	goto error0;
1da177e4 LT	268	}
	269	}
	270
	271	/*
	272	* Swap the data forks of the inodes
	273	*/
	274	ifp = &ip->i_df;
	275	tifp = &tip->i_df;
d0cfb373 ES	276	tempifp = ifp; /* struct copy */
	277	ifp = tifp; /* struct copy */
	278	tifp = tempifp; /* struct copy */
1da177e4 LT	279
	280	/*
	281	* Fix the on-disk inode values
	282	*/
	283	tmp = (__uint64_t)ip->i_d.di_nblocks;
	284	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	285	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	286
	287	tmp = (__uint64_t) ip->i_d.di_nextents;
	288	ip->i_d.di_nextents = tip->i_d.di_nextents;
	289	tip->i_d.di_nextents = tmp;
	290
	291	tmp = (__uint64_t) ip->i_d.di_format;
	292	ip->i_d.di_format = tip->i_d.di_format;
	293	tip->i_d.di_format = tmp;
	294
	295	ilf_fields = XFS_ILOG_CORE;
	296
	297	switch(ip->i_d.di_format) {
	298	case XFS_DINODE_FMT_EXTENTS:
	299	/* If the extents fit in the inode, fix the
	300	* pointer. Otherwise it's already NULL or
	301	* pointing to the extent.
	302	*/
	303	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	304	ifp->if_u1.if_extents =
	305	ifp->if_u2.if_inline_ext;
	306	}
	307	ilf_fields \|= XFS_ILOG_DEXT;
	308	break;
	309	case XFS_DINODE_FMT_BTREE:
	310	ilf_fields \|= XFS_ILOG_DBROOT;
	311	break;
	312	}
	313
	314	tilf_fields = XFS_ILOG_CORE;
	315
	316	switch(tip->i_d.di_format) {
	317	case XFS_DINODE_FMT_EXTENTS:
	318	/* If the extents fit in the inode, fix the
	319	* pointer. Otherwise it's already NULL or
	320	* pointing to the extent.
	321	*/
	322	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	323	tifp->if_u1.if_extents =
	324	tifp->if_u2.if_inline_ext;
	325	}
	326	tilf_fields \|= XFS_ILOG_DEXT;
	327	break;
	328	case XFS_DINODE_FMT_BTREE:
	329	tilf_fields \|= XFS_ILOG_DBROOT;
	330	break;
	331	}
	332
	333	/*
	334	* Increment vnode ref counts since xfs_trans_commit &
	335	* xfs_trans_cancel will both unlock the inodes and
	336	* decrement the associated ref counts.
	337	*/
	338	VN_HOLD(vp);
	339	VN_HOLD(tvp);
	340
	341	xfs_trans_ijoin(tp, ip, lock_flags);
	342	xfs_trans_ijoin(tp, tip, lock_flags);
343
344	xfs_trans_log_inode(tp, ip, ilf_fields);
345	xfs_trans_log_inode(tp, tip, tilf_fields);
346
347	/*
348	* If this is a synchronous mount, make sure that the
349	* transaction goes to disk before returning to the user.
350	*/
351	if (mp->m_flags & XFS_MOUNT_WSYNC) {
352	xfs_trans_set_sync(tp);
353	}
354
355	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
d0cfb373	356	locked = 0;
1da177e4 LT	357
	358	error0:
	359	if (locked) {
	360	xfs_iunlock(ip, lock_flags);
	361	xfs_iunlock(tip, lock_flags);
	362	}
	363
d0cfb373 ES	364	if (fp != NULL)
	365	fput(fp);
	366	if (tfp != NULL)
	367	fput(tfp);
	368
	369	if (sxp != NULL)
	370	kmem_free(sxp, sizeof(xfs_swapext_t));
	371	if (tempifp != NULL)
	372	kmem_free(tempifp, sizeof(xfs_ifork_t));
1da177e4 LT	373
	374	return error;
	375	}