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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"
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:
119 kmem_free(sxp, sizeof(xfs_swapext_t));
120 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;
131 xfs_inode_t *ips[2];
132 xfs_trans_t *tp;
133 xfs_bstat_t *sbp = &sxp->sx_stat;
Nathan Scott67fcaa72006-06-09 17:00:52 +1000134 bhv_vnode_t *vp, *tvp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000135 xfs_ifork_t *tempifp, *ifp, *tifp;
136 int ilf_fields, tilf_fields;
137 static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
138 int error = 0;
139 int aforkblks = 0;
140 int taforkblks = 0;
141 __uint64_t tmp;
142 char locked = 0;
143
144 mp = ip->i_mount;
145
146 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
147 if (!tempifp) {
148 error = XFS_ERROR(ENOMEM);
149 goto error0;
150 }
151
152 sbp = &sxp->sx_stat;
153 vp = XFS_ITOV(ip);
154 tvp = XFS_ITOV(tip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 /* Lock in i_ino order */
157 if (ip->i_ino < tip->i_ino) {
158 ips[0] = ip;
159 ips[1] = tip;
160 } else {
161 ips[0] = tip;
162 ips[1] = ip;
163 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100164
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000165 xfs_lock_inodes(ips, 2, lock_flags);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000166 locked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 /* Verify that both files have the same format */
169 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
170 error = XFS_ERROR(EINVAL);
171 goto error0;
172 }
173
174 /* Verify both files are either real-time or non-realtime */
Eric Sandeen71ddabb2007-11-23 16:29:42 +1100175 if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 error = XFS_ERROR(EINVAL);
177 goto error0;
178 }
179
180 /* Should never get a local format */
181 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
182 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
183 error = XFS_ERROR(EINVAL);
184 goto error0;
185 }
186
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000187 if (VN_CACHED(tvp) != 0) {
Christoph Hellwig613d7042007-10-11 17:44:08 +1000188 xfs_inval_cached_trace(tip, 0, -1, 0, -1);
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000189 error = xfs_flushinval_pages(tip, 0, -1,
190 FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +1000191 if (error)
192 goto error0;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 /* Verify O_DIRECT for ftmp */
196 if (VN_CACHED(tvp) != 0) {
197 error = XFS_ERROR(EINVAL);
198 goto error0;
199 }
200
201 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100202 if (sxp->sx_offset != 0 ||
203 sxp->sx_length != ip->i_d.di_size ||
204 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 error = XFS_ERROR(EFAULT);
206 goto error0;
207 }
208
209 /*
210 * If the target has extended attributes, the tmp file
211 * must also in order to ensure the correct data fork
212 * format.
213 */
214 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
215 error = XFS_ERROR(EINVAL);
216 goto error0;
217 }
218
219 /*
220 * Compare the current change & modify times with that
221 * passed in. If they differ, we abort this swap.
222 * This is the mechanism used to ensure the calling
223 * process that the file was not changed out from
224 * under it.
225 */
226 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
227 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
228 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
229 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
230 error = XFS_ERROR(EBUSY);
231 goto error0;
232 }
233
234 /* We need to fail if the file is memory mapped. Once we have tossed
235 * all existing pages, the page fault will have no option
236 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000237 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 * until we have switched the extents.
239 */
240 if (VN_MAPPED(vp)) {
241 error = XFS_ERROR(EBUSY);
242 goto error0;
243 }
244
245 xfs_iunlock(ip, XFS_ILOCK_EXCL);
246 xfs_iunlock(tip, XFS_ILOCK_EXCL);
247
248 /*
249 * There is a race condition here since we gave up the
250 * ilock. However, the data fork will not change since
251 * we have the iolock (locked for truncation too) so we
252 * are safe. We don't really care if non-io related
253 * fields change.
254 */
255
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000256 xfs_tosspages(ip, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
259 if ((error = xfs_trans_reserve(tp, 0,
260 XFS_ICHANGE_LOG_RES(mp), 0,
261 0, 0))) {
262 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
263 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
264 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100265 locked = 0;
266 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
Christoph Hellwigcfa853e2008-04-22 17:34:06 +1000268 xfs_lock_inodes(ips, 2, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 /*
271 * Count the number of extended attribute blocks
272 */
273 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
274 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
275 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
276 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100278 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
280 }
281 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
282 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
283 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
284 &taforkblks);
285 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100287 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289 }
290
291 /*
292 * Swap the data forks of the inodes
293 */
294 ifp = &ip->i_df;
295 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100296 *tempifp = *ifp; /* struct copy */
297 *ifp = *tifp; /* struct copy */
298 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /*
301 * Fix the on-disk inode values
302 */
303 tmp = (__uint64_t)ip->i_d.di_nblocks;
304 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
305 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
306
307 tmp = (__uint64_t) ip->i_d.di_nextents;
308 ip->i_d.di_nextents = tip->i_d.di_nextents;
309 tip->i_d.di_nextents = tmp;
310
311 tmp = (__uint64_t) ip->i_d.di_format;
312 ip->i_d.di_format = tip->i_d.di_format;
313 tip->i_d.di_format = tmp;
314
315 ilf_fields = XFS_ILOG_CORE;
316
317 switch(ip->i_d.di_format) {
318 case XFS_DINODE_FMT_EXTENTS:
319 /* If the extents fit in the inode, fix the
320 * pointer. Otherwise it's already NULL or
321 * pointing to the extent.
322 */
323 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
324 ifp->if_u1.if_extents =
325 ifp->if_u2.if_inline_ext;
326 }
327 ilf_fields |= XFS_ILOG_DEXT;
328 break;
329 case XFS_DINODE_FMT_BTREE:
330 ilf_fields |= XFS_ILOG_DBROOT;
331 break;
332 }
333
334 tilf_fields = XFS_ILOG_CORE;
335
336 switch(tip->i_d.di_format) {
337 case XFS_DINODE_FMT_EXTENTS:
338 /* If the extents fit in the inode, fix the
339 * pointer. Otherwise it's already NULL or
340 * pointing to the extent.
341 */
342 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
343 tifp->if_u1.if_extents =
344 tifp->if_u2.if_inline_ext;
345 }
346 tilf_fields |= XFS_ILOG_DEXT;
347 break;
348 case XFS_DINODE_FMT_BTREE:
349 tilf_fields |= XFS_ILOG_DBROOT;
350 break;
351 }
352
353 /*
354 * Increment vnode ref counts since xfs_trans_commit &
355 * xfs_trans_cancel will both unlock the inodes and
356 * decrement the associated ref counts.
357 */
358 VN_HOLD(vp);
359 VN_HOLD(tvp);
360
361 xfs_trans_ijoin(tp, ip, lock_flags);
362 xfs_trans_ijoin(tp, tip, lock_flags);
363
364 xfs_trans_log_inode(tp, ip, ilf_fields);
365 xfs_trans_log_inode(tp, tip, tilf_fields);
366
367 /*
368 * If this is a synchronous mount, make sure that the
369 * transaction goes to disk before returning to the user.
370 */
371 if (mp->m_flags & XFS_MOUNT_WSYNC) {
372 xfs_trans_set_sync(tp);
373 }
374
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000375 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100376 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 error0:
379 if (locked) {
380 xfs_iunlock(ip, lock_flags);
381 xfs_iunlock(tip, lock_flags);
382 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100383 if (tempifp != NULL)
384 kmem_free(tempifp, sizeof(xfs_ifork_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return error;
386}