[mirror_ubuntu-artful-kernel.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_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_bmap.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 *sxp)
{
	xfs_swapext_t	sx;
	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;
	uint		lock_flags=0;
	int		ilf_fields, tilf_fields;
	int		error = 0;
	xfs_ifork_t	tempif, *ifp, *tifp;
	__uint64_t	tmp;
	int		aforkblks = 0;
	int		taforkblks = 0;
	int		locked = 0;

	if (copy_from_user(&sx, sxp, sizeof(sx)))
		return XFS_ERROR(EFAULT);

	/* Pull information for the target fd */
	if (((fp = fget((int)sx.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)sx.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 = &sx.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;
	}
	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
	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 (sx.sx_offset != 0 ||
	    sx.sx_length != ip->i_d.di_size ||
	    sx.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);
		return error;
	}
	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_iunlock(ip,  lock_flags);
			xfs_iunlock(tip, lock_flags);
			xfs_trans_cancel(tp, 0);
			return error;
		}
	}
	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_iunlock(ip,  lock_flags);
			xfs_iunlock(tip, lock_flags);
			xfs_trans_cancel(tp, 0);
			return error;
		}
	}

	/*
	 * Swap the data forks of the inodes
	 */
	ifp = &ip->i_df;
	tifp = &tip->i_df;
	tempif = *ifp;	/* struct copy */
	*ifp = *tifp;	/* struct copy */
	*tifp = tempif;	/* 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);

	fput(fp);
	fput(tfp);

	return error;

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

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

	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	*/
	32
	33	#include "xfs.h"
	34	#include "xfs_macros.h"
	35	#include "xfs_types.h"
	36	#include "xfs_inum.h"
	37	#include "xfs_log.h"
	38	#include "xfs_trans.h"
	39	#include "xfs_sb.h"
	40	#include "xfs_dir.h"
	41	#include "xfs_dir2.h"
	42	#include "xfs_dmapi.h"
	43	#include "xfs_mount.h"
	44	#include "xfs_ag.h"
	45	#include "xfs_alloc_btree.h"
	46	#include "xfs_bmap_btree.h"
	47	#include "xfs_ialloc_btree.h"
	48	#include "xfs_btree.h"
	49	#include "xfs_attr_sf.h"
	50	#include "xfs_dir_sf.h"
	51	#include "xfs_dir2_sf.h"
	52	#include "xfs_dinode.h"
	53	#include "xfs_inode_item.h"
	54	#include "xfs_inode.h"
	55	#include "xfs_bmap.h"
	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(
68	xfs_swapext_t __user *sxp)
69	{
70	xfs_swapext_t sx;
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;
79	uint lock_flags=0;
80	int ilf_fields, tilf_fields;
81	int error = 0;
82	xfs_ifork_t tempif, ifp, tifp;
83	__uint64_t tmp;
84	int aforkblks = 0;
85	int taforkblks = 0;
86	int locked = 0;
87
88	if (copy_from_user(&sx, sxp, sizeof(sx)))
89	return XFS_ERROR(EFAULT);
90
91	/* Pull information for the target fd */
92	if (((fp = fget((int)sx.sx_fdtarget)) == NULL) \|\|
93	((vp = LINVFS_GET_VP(fp->f_dentry->d_inode)) == NULL)) {
94	error = XFS_ERROR(EINVAL);
95	goto error0;
96	}
97
98	bhp = VN_BHV_HEAD(vp);
99	bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
100	if (bdp == NULL) {
101	error = XFS_ERROR(EBADF);
102	goto error0;
103	} else {
104	ip = XFS_BHVTOI(bdp);
105	}
106
107	if (((tfp = fget((int)sx.sx_fdtmp)) == NULL) \|\|
108	((tvp = LINVFS_GET_VP(tfp->f_dentry->d_inode)) == NULL)) {
109	error = XFS_ERROR(EINVAL);
110	goto error0;
111	}
112
113	tbhp = VN_BHV_HEAD(tvp);
114	tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
115	if (tbdp == NULL) {
116	error = XFS_ERROR(EBADF);
117	goto error0;
118	} else {
119	tip = XFS_BHVTOI(tbdp);
120	}
121
122	if (ip->i_mount != tip->i_mount) {
123	error = XFS_ERROR(EINVAL);
124	goto error0;
125	}
126
127	if (ip->i_ino == tip->i_ino) {
128	error = XFS_ERROR(EINVAL);
129	goto error0;
130	}
131
132	mp = ip->i_mount;
133
134	sbp = &sx.sx_stat;
135
136	if (XFS_FORCED_SHUTDOWN(mp)) {
137	error = XFS_ERROR(EIO);
138	goto error0;
139	}
140
141	locked = 1;
142
143	/* Lock in i_ino order */
144	if (ip->i_ino < tip->i_ino) {
145	ips[0] = ip;
146	ips[1] = tip;
147	} else {
148	ips[0] = tip;
149	ips[1] = ip;
150	}
151	lock_flags = XFS_ILOCK_EXCL \| XFS_IOLOCK_EXCL;
152	xfs_lock_inodes(ips, 2, 0, lock_flags);
153
154	/* Check permissions */
155	error = xfs_iaccess(ip, S_IWUSR, NULL);
156	if (error)
157	goto error0;
158
159	error = xfs_iaccess(tip, S_IWUSR, NULL);
160	if (error)
161	goto error0;
162
163	/* Verify that both files have the same format */
164	if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
165	error = XFS_ERROR(EINVAL);
166	goto error0;
167	}
168
169	/* Verify both files are either real-time or non-realtime */
170	if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
171	(tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
172	error = XFS_ERROR(EINVAL);
173	goto error0;
174	}
175
176	/* Should never get a local format */
177	if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL \|\|
178	tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
179	error = XFS_ERROR(EINVAL);
180	goto error0;
181	}
182
bd5a876a CH	183	if (VN_CACHED(tvp) != 0) {
	184	xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
	185	VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
	186	}
1da177e4 LT	187
	188	/* Verify O_DIRECT for ftmp */
	189	if (VN_CACHED(tvp) != 0) {
	190	error = XFS_ERROR(EINVAL);
	191	goto error0;
	192	}
	193
	194	/* Verify all data are being swapped */
	195	if (sx.sx_offset != 0 \|\|
	196	sx.sx_length != ip->i_d.di_size \|\|
	197	sx.sx_length != tip->i_d.di_size) {
	198	error = XFS_ERROR(EFAULT);
	199	goto error0;
	200	}
	201
	202	/*
	203	* If the target has extended attributes, the tmp file
	204	* must also in order to ensure the correct data fork
	205	* format.
	206	*/
	207	if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
	208	error = XFS_ERROR(EINVAL);
	209	goto error0;
	210	}
	211
	212	/*
	213	* Compare the current change & modify times with that
	214	* passed in. If they differ, we abort this swap.
	215	* This is the mechanism used to ensure the calling
	216	* process that the file was not changed out from
	217	* under it.
	218	*/
	219	if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) \|\|
	220	(sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) \|\|
	221	(sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) \|\|
	222	(sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
	223	error = XFS_ERROR(EBUSY);
	224	goto error0;
	225	}
	226
	227	/* We need to fail if the file is memory mapped. Once we have tossed
	228	* all existing pages, the page fault will have no option
	229	* but to go to the filesystem for pages. By making the page fault call
	230	* VOP_READ (or write in the case of autogrow) they block on the iolock
	231	* until we have switched the extents.
	232	*/
	233	if (VN_MAPPED(vp)) {
	234	error = XFS_ERROR(EBUSY);
	235	goto error0;
	236	}
	237
	238	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	239	xfs_iunlock(tip, XFS_ILOCK_EXCL);
	240
	241	/*
	242	* There is a race condition here since we gave up the
	243	* ilock. However, the data fork will not change since
	244	* we have the iolock (locked for truncation too) so we
	245	* are safe. We don't really care if non-io related
	246	* fields change.
	247	*/
	248
	249	VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
	250
251	tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
252	if ((error = xfs_trans_reserve(tp, 0,
253	XFS_ICHANGE_LOG_RES(mp), 0,
254	0, 0))) {
255	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
256	xfs_iunlock(tip, XFS_IOLOCK_EXCL);
257	xfs_trans_cancel(tp, 0);
258	return error;
259	}
260	xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
261
262	/*
263	* Count the number of extended attribute blocks
264	*/
265	if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
266	(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
267	error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
268	if (error) {
269	xfs_iunlock(ip, lock_flags);
270	xfs_iunlock(tip, lock_flags);
271	xfs_trans_cancel(tp, 0);
272	return error;
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) {
280	xfs_iunlock(ip, lock_flags);
281	xfs_iunlock(tip, lock_flags);
282	xfs_trans_cancel(tp, 0);
283	return error;
284	}
285	}
286
287	/*
288	* Swap the data forks of the inodes
289	*/
290	ifp = &ip->i_df;
291	tifp = &tip->i_df;
292	tempif = ifp; / struct copy */
293	ifp = tifp; /* struct copy */
294	tifp = tempif; / struct copy */
295
296	/*
297	* Fix the on-disk inode values
298	*/
299	tmp = (__uint64_t)ip->i_d.di_nblocks;
300	ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
301	tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
302
303	tmp = (__uint64_t) ip->i_d.di_nextents;
304	ip->i_d.di_nextents = tip->i_d.di_nextents;
305	tip->i_d.di_nextents = tmp;
306
307	tmp = (__uint64_t) ip->i_d.di_format;
308	ip->i_d.di_format = tip->i_d.di_format;
309	tip->i_d.di_format = tmp;
310
311	ilf_fields = XFS_ILOG_CORE;
312
313	switch(ip->i_d.di_format) {
314	case XFS_DINODE_FMT_EXTENTS:
315	/* If the extents fit in the inode, fix the
316	* pointer. Otherwise it's already NULL or
317	* pointing to the extent.
318	*/
319	if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
320	ifp->if_u1.if_extents =
321	ifp->if_u2.if_inline_ext;
322	}
323	ilf_fields \|= XFS_ILOG_DEXT;
324	break;
325	case XFS_DINODE_FMT_BTREE:
326	ilf_fields \|= XFS_ILOG_DBROOT;
327	break;
328	}
329
330	tilf_fields = XFS_ILOG_CORE;
331
332	switch(tip->i_d.di_format) {
333	case XFS_DINODE_FMT_EXTENTS:
334	/* If the extents fit in the inode, fix the
335	* pointer. Otherwise it's already NULL or
336	* pointing to the extent.
337	*/
338	if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
339	tifp->if_u1.if_extents =
340	tifp->if_u2.if_inline_ext;
341	}
342	tilf_fields \|= XFS_ILOG_DEXT;
343	break;
344	case XFS_DINODE_FMT_BTREE:
345	tilf_fields \|= XFS_ILOG_DBROOT;
346	break;
347	}
348
349	/*
350	* Increment vnode ref counts since xfs_trans_commit &
351	* xfs_trans_cancel will both unlock the inodes and
352	* decrement the associated ref counts.
353	*/
354	VN_HOLD(vp);
355	VN_HOLD(tvp);
356
357	xfs_trans_ijoin(tp, ip, lock_flags);
358	xfs_trans_ijoin(tp, tip, lock_flags);
359
360	xfs_trans_log_inode(tp, ip, ilf_fields);
361	xfs_trans_log_inode(tp, tip, tilf_fields);
362
363	/*
364	* If this is a synchronous mount, make sure that the
365	* transaction goes to disk before returning to the user.
366	*/
367	if (mp->m_flags & XFS_MOUNT_WSYNC) {
368	xfs_trans_set_sync(tp);
369	}
370
371	error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
372
373	fput(fp);
374	fput(tfp);
375
376	return error;
377
378	error0:
379	if (locked) {
380	xfs_iunlock(ip, lock_flags);
381	xfs_iunlock(tip, lock_flags);
382	}
383
384	if (fp != NULL) fput(fp);
385	if (tfp != NULL) fput(tfp);
386
387	return error;
388	}