blob: 75b0cd4da0ea30140bbdd3068c02ba94c751bd13 [file] [log] [blame]
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"
Christoph Hellwig739bfb22007-08-29 10:58:01 +100045#include "xfs_vnodeops.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/*
48 * Syssgi interface for swapext
49 */
50int
51xfs_swapext(
Eric Sandeend0cfb372005-11-02 10:29:04 +110052 xfs_swapext_t __user *sxu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Eric Sandeend0cfb372005-11-02 10:29:04 +110054 xfs_swapext_t *sxp;
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110055 xfs_inode_t *ip, *tip;
56 struct file *file, *target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Eric Sandeend0cfb372005-11-02 10:29:04 +110059 sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
Olaf Weber3e57ecf2006-06-09 14:48:12 +100060 if (!sxp) {
Eric Sandeend0cfb372005-11-02 10:29:04 +110061 error = XFS_ERROR(ENOMEM);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110062 goto out;
Eric Sandeend0cfb372005-11-02 10:29:04 +110063 }
64
65 if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
66 error = XFS_ERROR(EFAULT);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110067 goto out_free_sxp;
Eric Sandeend0cfb372005-11-02 10:29:04 +110068 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 /* Pull information for the target fd */
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110071 file = fget((int)sxp->sx_fdtarget);
72 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 error = XFS_ERROR(EINVAL);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110074 goto out_free_sxp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 }
76
Christoph Hellwigf6aa7f22008-02-05 12:13:15 +110077 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) {
78 error = XFS_ERROR(EBADF);
79 goto out_put_file;
80 }
81
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110082 target_file = fget((int)sxp->sx_fdtmp);
83 if (!target_file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 error = XFS_ERROR(EINVAL);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110085 goto out_put_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87
Christoph Hellwigf6aa7f22008-02-05 12:13:15 +110088 if (!(target_file->f_mode & FMODE_WRITE) ||
89 (target_file->f_flags & O_APPEND)) {
90 error = XFS_ERROR(EBADF);
91 goto out_put_target_file;
92 }
93
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110094 ip = XFS_I(file->f_path.dentry->d_inode);
95 tip = XFS_I(target_file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 if (ip->i_mount != tip->i_mount) {
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110098 error = XFS_ERROR(EINVAL);
99 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
101
102 if (ip->i_ino == tip->i_ino) {
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100103 error = XFS_ERROR(EINVAL);
104 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 }
106
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100107 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
108 error = XFS_ERROR(EIO);
109 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000112 error = xfs_swap_extents(ip, tip, sxp);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000113
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100114 out_put_target_file:
115 fput(target_file);
116 out_put_file:
117 fput(file);
118 out_free_sxp:
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000119 kmem_free(sxp);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100120 out:
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000121 return error;
122}
123
124int
125xfs_swap_extents(
126 xfs_inode_t *ip,
127 xfs_inode_t *tip,
128 xfs_swapext_t *sxp)
129{
130 xfs_mount_t *mp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000131 xfs_trans_t *tp;
132 xfs_bstat_t *sbp = &sxp->sx_stat;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000133 xfs_ifork_t *tempifp, *ifp, *tifp;
134 int ilf_fields, tilf_fields;
135 static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
136 int error = 0;
137 int aforkblks = 0;
138 int taforkblks = 0;
139 __uint64_t tmp;
140 char locked = 0;
141
142 mp = ip->i_mount;
143
144 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
145 if (!tempifp) {
146 error = XFS_ERROR(ENOMEM);
147 goto error0;
148 }
149
150 sbp = &sxp->sx_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
David Chinnerf9114eb2008-09-17 16:51:21 +1000152 /*
153 * we have to do two separate lock calls here to keep lockdep
154 * happy. If we try to get all the locks in one call, lock will
155 * report false positives when we drop the ILOCK and regain them
156 * below.
157 */
158 xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
159 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000160 locked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 /* Verify that both files have the same format */
163 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
164 error = XFS_ERROR(EINVAL);
165 goto error0;
166 }
167
168 /* Verify both files are either real-time or non-realtime */
Eric Sandeen71ddabb2007-11-23 16:29:42 +1100169 if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 error = XFS_ERROR(EINVAL);
171 goto error0;
172 }
173
174 /* Should never get a local format */
175 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
176 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
177 error = XFS_ERROR(EINVAL);
178 goto error0;
179 }
180
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000181 if (VN_CACHED(VFS_I(tip)) != 0) {
Christoph Hellwig613d7042007-10-11 17:44:08 +1000182 xfs_inval_cached_trace(tip, 0, -1, 0, -1);
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000183 error = xfs_flushinval_pages(tip, 0, -1,
184 FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +1000185 if (error)
186 goto error0;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000187 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 /* Verify O_DIRECT for ftmp */
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000190 if (VN_CACHED(VFS_I(tip)) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 error = XFS_ERROR(EINVAL);
192 goto error0;
193 }
194
195 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100196 if (sxp->sx_offset != 0 ||
197 sxp->sx_length != ip->i_d.di_size ||
198 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 error = XFS_ERROR(EFAULT);
200 goto error0;
201 }
202
203 /*
204 * If the target has extended attributes, the tmp file
205 * must also in order to ensure the correct data fork
206 * format.
207 */
208 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
209 error = XFS_ERROR(EINVAL);
210 goto error0;
211 }
212
213 /*
214 * Compare the current change & modify times with that
215 * passed in. If they differ, we abort this swap.
216 * This is the mechanism used to ensure the calling
217 * process that the file was not changed out from
218 * under it.
219 */
220 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
221 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
222 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
223 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
224 error = XFS_ERROR(EBUSY);
225 goto error0;
226 }
227
228 /* We need to fail if the file is memory mapped. Once we have tossed
229 * all existing pages, the page fault will have no option
230 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000231 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 * until we have switched the extents.
233 */
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000234 if (VN_MAPPED(VFS_I(ip))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 error = XFS_ERROR(EBUSY);
236 goto error0;
237 }
238
239 xfs_iunlock(ip, XFS_ILOCK_EXCL);
240 xfs_iunlock(tip, XFS_ILOCK_EXCL);
241
242 /*
243 * There is a race condition here since we gave up the
244 * ilock. However, the data fork will not change since
245 * we have the iolock (locked for truncation too) so we
246 * are safe. We don't really care if non-io related
247 * fields change.
248 */
249
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000250 xfs_tosspages(ip, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
253 if ((error = xfs_trans_reserve(tp, 0,
254 XFS_ICHANGE_LOG_RES(mp), 0,
255 0, 0))) {
256 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
257 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
258 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100259 locked = 0;
260 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
Christoph Hellwige1cccd92008-08-13 16:18:07 +1000262 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 /*
265 * Count the number of extended attribute blocks
266 */
267 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
268 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
269 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
270 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100272 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100281 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
283 }
284
285 /*
286 * Swap the data forks of the inodes
287 */
288 ifp = &ip->i_df;
289 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100290 *tempifp = *ifp; /* struct copy */
291 *ifp = *tifp; /* struct copy */
292 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 /*
295 * Fix the on-disk inode values
296 */
297 tmp = (__uint64_t)ip->i_d.di_nblocks;
298 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
299 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
300
301 tmp = (__uint64_t) ip->i_d.di_nextents;
302 ip->i_d.di_nextents = tip->i_d.di_nextents;
303 tip->i_d.di_nextents = tmp;
304
305 tmp = (__uint64_t) ip->i_d.di_format;
306 ip->i_d.di_format = tip->i_d.di_format;
307 tip->i_d.di_format = tmp;
308
309 ilf_fields = XFS_ILOG_CORE;
310
311 switch(ip->i_d.di_format) {
312 case XFS_DINODE_FMT_EXTENTS:
313 /* If the extents fit in the inode, fix the
314 * pointer. Otherwise it's already NULL or
315 * pointing to the extent.
316 */
317 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
318 ifp->if_u1.if_extents =
319 ifp->if_u2.if_inline_ext;
320 }
321 ilf_fields |= XFS_ILOG_DEXT;
322 break;
323 case XFS_DINODE_FMT_BTREE:
324 ilf_fields |= XFS_ILOG_DBROOT;
325 break;
326 }
327
328 tilf_fields = XFS_ILOG_CORE;
329
330 switch(tip->i_d.di_format) {
331 case XFS_DINODE_FMT_EXTENTS:
332 /* If the extents fit in the inode, fix the
333 * pointer. Otherwise it's already NULL or
334 * pointing to the extent.
335 */
336 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
337 tifp->if_u1.if_extents =
338 tifp->if_u2.if_inline_ext;
339 }
340 tilf_fields |= XFS_ILOG_DEXT;
341 break;
342 case XFS_DINODE_FMT_BTREE:
343 tilf_fields |= XFS_ILOG_DBROOT;
344 break;
345 }
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Christoph Hellwig0b1f91772008-08-13 16:13:09 +1000348 IHOLD(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 xfs_trans_ijoin(tp, ip, lock_flags);
Christoph Hellwig0b1f91772008-08-13 16:13:09 +1000350
351 IHOLD(tip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 xfs_trans_ijoin(tp, tip, lock_flags);
353
354 xfs_trans_log_inode(tp, ip, ilf_fields);
355 xfs_trans_log_inode(tp, tip, tilf_fields);
356
357 /*
358 * If this is a synchronous mount, make sure that the
359 * transaction goes to disk before returning to the user.
360 */
361 if (mp->m_flags & XFS_MOUNT_WSYNC) {
362 xfs_trans_set_sync(tp);
363 }
364
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000365 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100366 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 error0:
369 if (locked) {
370 xfs_iunlock(ip, lock_flags);
371 xfs_iunlock(tip, lock_flags);
372 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100373 if (tempifp != NULL)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000374 kmem_free(tempifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 return error;
376}