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

/*
 * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#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;
	bhv_desc_t      *bdp, *tbdp;
	vn_bhv_head_t   *bhp, *tbhp;
	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 = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL))  {
		error = XFS_ERROR(EINVAL);
		goto error0;
	}

	bhp = VN_BHV_HEAD(vp);
	bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
	if (bdp == NULL) {
		error = XFS_ERROR(EBADF);
		goto error0;
	} else {
		ip = XFS_BHVTOI(bdp);
	}

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

	tbhp = VN_BHV_HEAD(tvp);
	tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
	if (tbdp == NULL) {
		error = XFS_ERROR(EBADF);
		goto error0;
	} else {
		tip = XFS_BHVTOI(tbdp);
	}

	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 LT	1	/*
	2	* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it would be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	11	*
	12	* Further, this software is distributed without any warranty that it is
	13	* free of the rightful claim of any third person regarding infringement
	14	* or the like. Any license provided herein, whether implied or
	15	* otherwise, applies only to this software file. Patent licenses, if
	16	* any, provided herein do not apply to combinations of this program with
	17	* other software, or any other product whatsoever.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write the Free Software Foundation, Inc., 59
	21	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	22	*
	23	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	24	* Mountain View, CA 94043, or:
	25	*
	26	* http://www.sgi.com
	27	*
	28	* For further information regarding this notice, see:
	29	*
	30	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	31	*/
1da177e4	32	#include "xfs.h"
a844f451	33	#include "xfs_fs.h"
1da177e4	34	#include "xfs_types.h"
a844f451	35	#include "xfs_bit.h"
1da177e4	36	#include "xfs_log.h"
a844f451	37	#include "xfs_inum.h"
1da177e4 LT	38	#include "xfs_trans.h"
1da177e4 LT	39	#include "xfs_sb.h"
a844f451	40	#include "xfs_ag.h"
1da177e4 LT	41	#include "xfs_dir.h"
	42	#include "xfs_dir2.h"
	43	#include "xfs_dmapi.h"
	44	#include "xfs_mount.h"
1da177e4	45	#include "xfs_bmap_btree.h"
a844f451	46	#include "xfs_alloc_btree.h"
1da177e4	47	#include "xfs_ialloc_btree.h"
1da177e4 LT	48	#include "xfs_dir_sf.h"
1da177e4 LT	49	#include "xfs_dir2_sf.h"
a844f451	50	#include "xfs_attr_sf.h"
1da177e4	51	#include "xfs_dinode.h"
1da177e4	52	#include "xfs_inode.h"
a844f451	53	#include "xfs_inode_item.h"
1da177e4	54	#include "xfs_bmap.h"
a844f451	55	#include "xfs_btree.h"
1da177e4 LT	56	#include "xfs_ialloc.h"
	57	#include "xfs_itable.h"
	58	#include "xfs_dfrag.h"
	59	#include "xfs_error.h"
	60	#include "xfs_mac.h"
	61	#include "xfs_rw.h"
	62
	63	/*
	64	* Syssgi interface for swapext
	65	*/
	66	int
	67	xfs_swapext(
d0cfb373	68	xfs_swapext_t __user *sxu)
1da177e4	69	{
d0cfb373	70	xfs_swapext_t *sxp;
1da177e4 LT	71	xfs_inode_t ip=NULL, tip=NULL, *ips[2];
	72	xfs_trans_t *tp;
	73	xfs_mount_t *mp;
	74	xfs_bstat_t *sbp;
	75	struct file fp = NULL, tfp = NULL;
	76	vnode_t vp, tvp;
	77	bhv_desc_t bdp, tbdp;
	78	vn_bhv_head_t bhp, tbhp;
d0cfb373	79	static uint lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
1da177e4 LT	80	int ilf_fields, tilf_fields;
1da177e4 LT	81	int error = 0;
d0cfb373	82	xfs_ifork_t tempifp, ifp, *tifp;
1da177e4 LT	83	__uint64_t tmp;
	84	int aforkblks = 0;
	85	int taforkblks = 0;
d0cfb373	86	char locked = 0;
1da177e4	87
d0cfb373 ES	88	sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
	89	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
	90	if (!sxp \|\| !tempifp) {
	91	error = XFS_ERROR(ENOMEM);
	92	goto error0;
	93	}
	94
	95	if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
	96	error = XFS_ERROR(EFAULT);
	97	goto error0;
	98	}
1da177e4 LT	99
1da177e4 LT	100	/* Pull information for the target fd */
d0cfb373	101	if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) \|\|
1da177e4 LT	102	((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) {
	103	error = XFS_ERROR(EINVAL);
	104	goto error0;
	105	}
	106
	107	bhp = VN_BHV_HEAD(vp);
	108	bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
	109	if (bdp == NULL) {
	110	error = XFS_ERROR(EBADF);
	111	goto error0;
	112	} else {
	113	ip = XFS_BHVTOI(bdp);
	114	}
	115
d0cfb373	116	if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) \|\|
1da177e4 LT	117	((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) {
	118	error = XFS_ERROR(EINVAL);
	119	goto error0;
	120	}
	121
	122	tbhp = VN_BHV_HEAD(tvp);
	123	tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
	124	if (tbdp == NULL) {
	125	error = XFS_ERROR(EBADF);
	126	goto error0;
	127	} else {
	128	tip = XFS_BHVTOI(tbdp);
	129	}
	130
	131	if (ip->i_mount != tip->i_mount) {
	132	error = XFS_ERROR(EINVAL);
	133	goto error0;
	134	}
	135
	136	if (ip->i_ino == tip->i_ino) {
	137	error = XFS_ERROR(EINVAL);
	138	goto error0;
	139	}
	140
	141	mp = ip->i_mount;
	142
d0cfb373	143	sbp = &sxp->sx_stat;
1da177e4 LT	144
	145	if (XFS_FORCED_SHUTDOWN(mp)) {
	146	error = XFS_ERROR(EIO);
	147	goto error0;
	148	}
	149
	150	locked = 1;
	151
	152	/* Lock in i_ino order */
	153	if (ip->i_ino < tip->i_ino) {
	154	ips[0] = ip;
	155	ips[1] = tip;
	156	} else {
	157	ips[0] = tip;
	158	ips[1] = ip;
	159	}
d0cfb373	160
1da177e4 LT	161	xfs_lock_inodes(ips, 2, 0, lock_flags);
	162
	163	/* Check permissions */
	164	error = xfs_iaccess(ip, S_IWUSR, NULL);
	165	if (error)
	166	goto error0;
	167
	168	error = xfs_iaccess(tip, S_IWUSR, NULL);
	169	if (error)
	170	goto error0;
	171
	172	/* Verify that both files have the same format */
	173	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
	174	error = XFS_ERROR(EINVAL);
	175	goto error0;
	176	}
	177
	178	/* Verify both files are either real-time or non-realtime */
	179	if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
	180	(tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
	181	error = XFS_ERROR(EINVAL);
	182	goto error0;
	183	}
	184
	185	/* Should never get a local format */
	186	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
	187	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
	188	error = XFS_ERROR(EINVAL);
	189	goto error0;
	190	}
	191
bd5a876a CH	192	if (VN_CACHED(tvp) != 0) {
	193	xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
	194	VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
	195	}
1da177e4 LT	196
	197	/* Verify O_DIRECT for ftmp */
	198	if (VN_CACHED(tvp) != 0) {
	199	error = XFS_ERROR(EINVAL);
	200	goto error0;
	201	}
	202
	203	/* Verify all data are being swapped */
d0cfb373 ES	204	if (sxp->sx_offset != 0 \|\|
	205	sxp->sx_length != ip->i_d.di_size \|\|
	206	sxp->sx_length != tip->i_d.di_size) {
1da177e4 LT	207	error = XFS_ERROR(EFAULT);
	208	goto error0;
	209	}
	210
	211	/*
	212	* If the target has extended attributes, the tmp file
	213	* must also in order to ensure the correct data fork
	214	* format.
	215	*/
	216	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	217	error = XFS_ERROR(EINVAL);
	218	goto error0;
	219	}
	220
	221	/*
	222	* Compare the current change & modify times with that
	223	* passed in. If they differ, we abort this swap.
	224	* This is the mechanism used to ensure the calling
	225	* process that the file was not changed out from
	226	* under it.
	227	*/
	228	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	229	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	230	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	231	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	232	error = XFS_ERROR(EBUSY);
	233	goto error0;
	234	}
	235
	236	/* We need to fail if the file is memory mapped. Once we have tossed
	237	* all existing pages, the page fault will have no option
	238	* but to go to the filesystem for pages. By making the page fault call
	239	* VOP_READ (or write in the case of autogrow) they block on the iolock
	240	* until we have switched the extents.
	241	*/
	242	if (VN_MAPPED(vp)) {
	243	error = XFS_ERROR(EBUSY);
	244	goto error0;
	245	}
	246
	247	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	248	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	249
	250	/*
	251	* There is a race condition here since we gave up the
	252	* ilock. However, the data fork will not change since
	253	* we have the iolock (locked for truncation too) so we
	254	* are safe. We don't really care if non-io related
	255	* fields change.
	256	*/
	257
	258	VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
	259
	260	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
	261	if ((error = xfs_trans_reserve(tp, 0,
	262	XFS_ICHANGE_LOG_RES(mp), 0,
	263	0, 0))) {
	264	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
	265	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
	266	xfs_trans_cancel(tp, 0);
d0cfb373 ES	267	locked = 0;
d0cfb373 ES	268	goto error0;
1da177e4 LT	269	}
	270	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
	271
	272	/*
	273	* Count the number of extended attribute blocks
	274	*/
	275	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
	276	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	277	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
	278	if (error) {
1da177e4	279	xfs_trans_cancel(tp, 0);
d0cfb373	280	goto error0;
1da177e4 LT	281	}
	282	}
	283	if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
	284	(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
	285	error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
	286	&taforkblks);
	287	if (error) {
1da177e4	288	xfs_trans_cancel(tp, 0);
d0cfb373	289	goto error0;
1da177e4 LT	290	}
	291	}
	292
	293	/*
	294	* Swap the data forks of the inodes
	295	*/
	296	ifp = &ip->i_df;
	297	tifp = &tip->i_df;
d0cfb373 ES	298	tempifp = ifp; /* struct copy */
	299	ifp = tifp; /* struct copy */
	300	tifp = tempifp; /* struct copy */
1da177e4 LT	301
	302	/*
	303	* Fix the on-disk inode values
	304	*/
	305	tmp = (__uint64_t)ip->i_d.di_nblocks;
	306	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
	307	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
	308
	309	tmp = (__uint64_t) ip->i_d.di_nextents;
	310	ip->i_d.di_nextents = tip->i_d.di_nextents;
	311	tip->i_d.di_nextents = tmp;
	312
	313	tmp = (__uint64_t) ip->i_d.di_format;
	314	ip->i_d.di_format = tip->i_d.di_format;
	315	tip->i_d.di_format = tmp;
	316
	317	ilf_fields = XFS_ILOG_CORE;
	318
	319	switch(ip->i_d.di_format) {
	320	case XFS_DINODE_FMT_EXTENTS:
	321	/* If the extents fit in the inode, fix the
	322	* pointer. Otherwise it's already NULL or
	323	* pointing to the extent.
	324	*/
	325	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	326	ifp->if_u1.if_extents =
	327	ifp->if_u2.if_inline_ext;
	328	}
	329	ilf_fields \|= XFS_ILOG_DEXT;
	330	break;
	331	case XFS_DINODE_FMT_BTREE:
	332	ilf_fields \|= XFS_ILOG_DBROOT;
	333	break;
	334	}
	335
	336	tilf_fields = XFS_ILOG_CORE;
	337
	338	switch(tip->i_d.di_format) {
	339	case XFS_DINODE_FMT_EXTENTS:
	340	/* If the extents fit in the inode, fix the
	341	* pointer. Otherwise it's already NULL or
	342	* pointing to the extent.
	343	*/
	344	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
	345	tifp->if_u1.if_extents =
	346	tifp->if_u2.if_inline_ext;
	347	}
	348	tilf_fields \|= XFS_ILOG_DEXT;
	349	break;
	350	case XFS_DINODE_FMT_BTREE:
	351	tilf_fields \|= XFS_ILOG_DBROOT;
	352	break;
	353	}
	354
	355	/*
	356	* Increment vnode ref counts since xfs_trans_commit &
	357	* xfs_trans_cancel will both unlock the inodes and
	358	* decrement the associated ref counts.
	359	*/
	360	VN_HOLD(vp);
	361	VN_HOLD(tvp);
	362
	363	xfs_trans_ijoin(tp, ip, lock_flags);
	364	xfs_trans_ijoin(tp, tip, lock_flags);
365
366	xfs_trans_log_inode(tp, ip, ilf_fields);
367	xfs_trans_log_inode(tp, tip, tilf_fields);
368
369	/*
370	* If this is a synchronous mount, make sure that the
371	* transaction goes to disk before returning to the user.
372	*/
373	if (mp->m_flags & XFS_MOUNT_WSYNC) {
374	xfs_trans_set_sync(tp);
375	}
376
377	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
d0cfb373	378	locked = 0;
1da177e4 LT	379
	380	error0:
	381	if (locked) {
	382	xfs_iunlock(ip, lock_flags);
	383	xfs_iunlock(tip, lock_flags);
	384	}
	385
d0cfb373 ES	386	if (fp != NULL)
	387	fput(fp);
	388	if (tfp != NULL)
	389	fput(tfp);
	390
	391	if (sxp != NULL)
	392	kmem_free(sxp, sizeof(xfs_swapext_t));
	393	if (tempifp != NULL)
	394	kmem_free(tempifp, sizeof(xfs_ifork_t));
1da177e4 LT	395
	396	return error;
	397	}