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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Olaf Weber3e57ecf2006-06-09 14:48:12 +10002 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Nathan Scott7b718762005-11-02 14:58:39 +11003 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
25#include "xfs_sb.h"
Nathan Scotta844f452005-11-02 14:38:42 +110026#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110034#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110037#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include "xfs_bmap.h"
Nathan Scotta844f452005-11-02 14:38:42 +110039#include "xfs_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "xfs_ialloc.h"
41#include "xfs_itable.h"
42#include "xfs_dfrag.h"
43#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_rw.h"
45
46/*
47 * Syssgi interface for swapext
48 */
49int
50xfs_swapext(
Eric Sandeend0cfb372005-11-02 10:29:04 +110051 xfs_swapext_t __user *sxu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
Eric Sandeend0cfb372005-11-02 10:29:04 +110053 xfs_swapext_t *sxp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +100054 xfs_inode_t *ip=NULL, *tip=NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 struct file *fp = NULL, *tfp = NULL;
Nathan Scott67fcaa72006-06-09 17:00:52 +100057 bhv_vnode_t *vp, *tvp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Eric Sandeend0cfb372005-11-02 10:29:04 +110060 sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
Olaf Weber3e57ecf2006-06-09 14:48:12 +100061 if (!sxp) {
Eric Sandeend0cfb372005-11-02 10:29:04 +110062 error = XFS_ERROR(ENOMEM);
63 goto error0;
64 }
65
66 if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
67 error = XFS_ERROR(EFAULT);
68 goto error0;
69 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71 /* Pull information for the target fd */
Eric Sandeend0cfb372005-11-02 10:29:04 +110072 if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) ||
Josef "Jeff" Sipeke678fb02006-12-08 02:36:49 -080073 ((vp = vn_from_inode(fp->f_path.dentry->d_inode)) == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 error = XFS_ERROR(EINVAL);
75 goto error0;
76 }
77
Christoph Hellwig75e17b32006-01-11 20:58:44 +110078 ip = xfs_vtoi(vp);
79 if (ip == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 error = XFS_ERROR(EBADF);
81 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 }
83
Eric Sandeend0cfb372005-11-02 10:29:04 +110084 if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
Josef "Jeff" Sipeke678fb02006-12-08 02:36:49 -080085 ((tvp = vn_from_inode(tfp->f_path.dentry->d_inode)) == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 error = XFS_ERROR(EINVAL);
87 goto error0;
88 }
89
Christoph Hellwig75e17b32006-01-11 20:58:44 +110090 tip = xfs_vtoi(tvp);
91 if (tip == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 error = XFS_ERROR(EBADF);
93 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
95
96 if (ip->i_mount != tip->i_mount) {
97 error = XFS_ERROR(EINVAL);
98 goto error0;
99 }
100
101 if (ip->i_ino == tip->i_ino) {
102 error = XFS_ERROR(EINVAL);
103 goto error0;
104 }
105
106 mp = ip->i_mount;
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 if (XFS_FORCED_SHUTDOWN(mp)) {
109 error = XFS_ERROR(EIO);
110 goto error0;
111 }
112
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000113 error = XFS_SWAP_EXTENTS(mp, &ip->i_iocore, &tip->i_iocore, sxp);
114
115 error0:
116 if (fp != NULL)
117 fput(fp);
118 if (tfp != NULL)
119 fput(tfp);
120
121 if (sxp != NULL)
122 kmem_free(sxp, sizeof(xfs_swapext_t));
123
124 return error;
125}
126
127int
128xfs_swap_extents(
129 xfs_inode_t *ip,
130 xfs_inode_t *tip,
131 xfs_swapext_t *sxp)
132{
133 xfs_mount_t *mp;
134 xfs_inode_t *ips[2];
135 xfs_trans_t *tp;
136 xfs_bstat_t *sbp = &sxp->sx_stat;
Nathan Scott67fcaa72006-06-09 17:00:52 +1000137 bhv_vnode_t *vp, *tvp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000138 xfs_ifork_t *tempifp, *ifp, *tifp;
139 int ilf_fields, tilf_fields;
140 static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
141 int error = 0;
142 int aforkblks = 0;
143 int taforkblks = 0;
144 __uint64_t tmp;
145 char locked = 0;
146
147 mp = ip->i_mount;
148
149 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
150 if (!tempifp) {
151 error = XFS_ERROR(ENOMEM);
152 goto error0;
153 }
154
155 sbp = &sxp->sx_stat;
156 vp = XFS_ITOV(ip);
157 tvp = XFS_ITOV(tip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 /* Lock in i_ino order */
160 if (ip->i_ino < tip->i_ino) {
161 ips[0] = ip;
162 ips[1] = tip;
163 } else {
164 ips[0] = tip;
165 ips[1] = ip;
166 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 xfs_lock_inodes(ips, 2, 0, lock_flags);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000169 locked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 /* Check permissions */
172 error = xfs_iaccess(ip, S_IWUSR, NULL);
173 if (error)
174 goto error0;
175
176 error = xfs_iaccess(tip, S_IWUSR, NULL);
177 if (error)
178 goto error0;
179
180 /* Verify that both files have the same format */
181 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
182 error = XFS_ERROR(EINVAL);
183 goto error0;
184 }
185
186 /* Verify both files are either real-time or non-realtime */
187 if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
188 (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
189 error = XFS_ERROR(EINVAL);
190 goto error0;
191 }
192
193 /* Should never get a local format */
194 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
195 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
196 error = XFS_ERROR(EINVAL);
197 goto error0;
198 }
199
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000200 if (VN_CACHED(tvp) != 0) {
201 xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +1000202 error = bhv_vop_flushinval_pages(tvp, 0, -1, FI_REMAPF_LOCKED);
203 if (error)
204 goto error0;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000205 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 /* Verify O_DIRECT for ftmp */
208 if (VN_CACHED(tvp) != 0) {
209 error = XFS_ERROR(EINVAL);
210 goto error0;
211 }
212
213 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100214 if (sxp->sx_offset != 0 ||
215 sxp->sx_length != ip->i_d.di_size ||
216 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 error = XFS_ERROR(EFAULT);
218 goto error0;
219 }
220
221 /*
222 * If the target has extended attributes, the tmp file
223 * must also in order to ensure the correct data fork
224 * format.
225 */
226 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
227 error = XFS_ERROR(EINVAL);
228 goto error0;
229 }
230
231 /*
232 * Compare the current change & modify times with that
233 * passed in. If they differ, we abort this swap.
234 * This is the mechanism used to ensure the calling
235 * process that the file was not changed out from
236 * under it.
237 */
238 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
239 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
240 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
241 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
242 error = XFS_ERROR(EBUSY);
243 goto error0;
244 }
245
246 /* We need to fail if the file is memory mapped. Once we have tossed
247 * all existing pages, the page fault will have no option
248 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000249 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 * until we have switched the extents.
251 */
252 if (VN_MAPPED(vp)) {
253 error = XFS_ERROR(EBUSY);
254 goto error0;
255 }
256
257 xfs_iunlock(ip, XFS_ILOCK_EXCL);
258 xfs_iunlock(tip, XFS_ILOCK_EXCL);
259
260 /*
261 * There is a race condition here since we gave up the
262 * ilock. However, the data fork will not change since
263 * we have the iolock (locked for truncation too) so we
264 * are safe. We don't really care if non-io related
265 * fields change.
266 */
267
Nathan Scott67fcaa72006-06-09 17:00:52 +1000268 bhv_vop_toss_pages(vp, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
271 if ((error = xfs_trans_reserve(tp, 0,
272 XFS_ICHANGE_LOG_RES(mp), 0,
273 0, 0))) {
274 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
275 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
276 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100277 locked = 0;
278 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
280 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
281
282 /*
283 * Count the number of extended attribute blocks
284 */
285 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
286 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
287 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
288 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100290 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
292 }
293 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
294 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
295 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
296 &taforkblks);
297 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100299 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 }
301 }
302
303 /*
304 * Swap the data forks of the inodes
305 */
306 ifp = &ip->i_df;
307 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100308 *tempifp = *ifp; /* struct copy */
309 *ifp = *tifp; /* struct copy */
310 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 /*
313 * Fix the on-disk inode values
314 */
315 tmp = (__uint64_t)ip->i_d.di_nblocks;
316 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
317 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
318
319 tmp = (__uint64_t) ip->i_d.di_nextents;
320 ip->i_d.di_nextents = tip->i_d.di_nextents;
321 tip->i_d.di_nextents = tmp;
322
323 tmp = (__uint64_t) ip->i_d.di_format;
324 ip->i_d.di_format = tip->i_d.di_format;
325 tip->i_d.di_format = tmp;
326
327 ilf_fields = XFS_ILOG_CORE;
328
329 switch(ip->i_d.di_format) {
330 case XFS_DINODE_FMT_EXTENTS:
331 /* If the extents fit in the inode, fix the
332 * pointer. Otherwise it's already NULL or
333 * pointing to the extent.
334 */
335 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
336 ifp->if_u1.if_extents =
337 ifp->if_u2.if_inline_ext;
338 }
339 ilf_fields |= XFS_ILOG_DEXT;
340 break;
341 case XFS_DINODE_FMT_BTREE:
342 ilf_fields |= XFS_ILOG_DBROOT;
343 break;
344 }
345
346 tilf_fields = XFS_ILOG_CORE;
347
348 switch(tip->i_d.di_format) {
349 case XFS_DINODE_FMT_EXTENTS:
350 /* If the extents fit in the inode, fix the
351 * pointer. Otherwise it's already NULL or
352 * pointing to the extent.
353 */
354 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
355 tifp->if_u1.if_extents =
356 tifp->if_u2.if_inline_ext;
357 }
358 tilf_fields |= XFS_ILOG_DEXT;
359 break;
360 case XFS_DINODE_FMT_BTREE:
361 tilf_fields |= XFS_ILOG_DBROOT;
362 break;
363 }
364
365 /*
366 * Increment vnode ref counts since xfs_trans_commit &
367 * xfs_trans_cancel will both unlock the inodes and
368 * decrement the associated ref counts.
369 */
370 VN_HOLD(vp);
371 VN_HOLD(tvp);
372
373 xfs_trans_ijoin(tp, ip, lock_flags);
374 xfs_trans_ijoin(tp, tip, lock_flags);
375
376 xfs_trans_log_inode(tp, ip, ilf_fields);
377 xfs_trans_log_inode(tp, tip, tilf_fields);
378
379 /*
380 * If this is a synchronous mount, make sure that the
381 * transaction goes to disk before returning to the user.
382 */
383 if (mp->m_flags & XFS_MOUNT_WSYNC) {
384 xfs_trans_set_sync(tp);
385 }
386
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000387 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100388 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 error0:
391 if (locked) {
392 xfs_iunlock(ip, lock_flags);
393 xfs_iunlock(tip, lock_flags);
394 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100395 if (tempifp != NULL)
396 kmem_free(tempifp, sizeof(xfs_ifork_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return error;
398}