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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;
Olaf Weber3e57ecf2006-06-09 14:48:12 +100055 xfs_inode_t *ip=NULL, *tip=NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 struct file *fp = NULL, *tfp = NULL;
Nathan Scott67fcaa72006-06-09 17:00:52 +100058 bhv_vnode_t *vp, *tvp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Eric Sandeend0cfb372005-11-02 10:29:04 +110061 sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
Olaf Weber3e57ecf2006-06-09 14:48:12 +100062 if (!sxp) {
Eric Sandeend0cfb372005-11-02 10:29:04 +110063 error = XFS_ERROR(ENOMEM);
64 goto error0;
65 }
66
67 if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
68 error = XFS_ERROR(EFAULT);
69 goto error0;
70 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72 /* Pull information for the target fd */
Eric Sandeend0cfb372005-11-02 10:29:04 +110073 if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) ||
Josef "Jeff" Sipeke678fb02006-12-08 02:36:49 -080074 ((vp = vn_from_inode(fp->f_path.dentry->d_inode)) == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 error = XFS_ERROR(EINVAL);
76 goto error0;
77 }
78
Christoph Hellwig75e17b32006-01-11 20:58:44 +110079 ip = xfs_vtoi(vp);
80 if (ip == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 error = XFS_ERROR(EBADF);
82 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
84
Eric Sandeend0cfb372005-11-02 10:29:04 +110085 if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
Josef "Jeff" Sipeke678fb02006-12-08 02:36:49 -080086 ((tvp = vn_from_inode(tfp->f_path.dentry->d_inode)) == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 error = XFS_ERROR(EINVAL);
88 goto error0;
89 }
90
Christoph Hellwig75e17b32006-01-11 20:58:44 +110091 tip = xfs_vtoi(tvp);
92 if (tip == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 error = XFS_ERROR(EBADF);
94 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96
97 if (ip->i_mount != tip->i_mount) {
98 error = XFS_ERROR(EINVAL);
99 goto error0;
100 }
101
102 if (ip->i_ino == tip->i_ino) {
103 error = XFS_ERROR(EINVAL);
104 goto error0;
105 }
106
107 mp = ip->i_mount;
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 if (XFS_FORCED_SHUTDOWN(mp)) {
110 error = XFS_ERROR(EIO);
111 goto error0;
112 }
113
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000114 error = xfs_swap_extents(ip, tip, sxp);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000115
116 error0:
117 if (fp != NULL)
118 fput(fp);
119 if (tfp != NULL)
120 fput(tfp);
121
122 if (sxp != NULL)
123 kmem_free(sxp, sizeof(xfs_swapext_t));
124
125 return error;
126}
127
128int
129xfs_swap_extents(
130 xfs_inode_t *ip,
131 xfs_inode_t *tip,
132 xfs_swapext_t *sxp)
133{
134 xfs_mount_t *mp;
135 xfs_inode_t *ips[2];
136 xfs_trans_t *tp;
137 xfs_bstat_t *sbp = &sxp->sx_stat;
Nathan Scott67fcaa72006-06-09 17:00:52 +1000138 bhv_vnode_t *vp, *tvp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000139 xfs_ifork_t *tempifp, *ifp, *tifp;
140 int ilf_fields, tilf_fields;
141 static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
142 int error = 0;
143 int aforkblks = 0;
144 int taforkblks = 0;
145 __uint64_t tmp;
146 char locked = 0;
147
148 mp = ip->i_mount;
149
150 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
151 if (!tempifp) {
152 error = XFS_ERROR(ENOMEM);
153 goto error0;
154 }
155
156 sbp = &sxp->sx_stat;
157 vp = XFS_ITOV(ip);
158 tvp = XFS_ITOV(tip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 /* Lock in i_ino order */
161 if (ip->i_ino < tip->i_ino) {
162 ips[0] = ip;
163 ips[1] = tip;
164 } else {
165 ips[0] = tip;
166 ips[1] = ip;
167 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 xfs_lock_inodes(ips, 2, 0, lock_flags);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000170 locked = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 /* Check permissions */
173 error = xfs_iaccess(ip, S_IWUSR, NULL);
174 if (error)
175 goto error0;
176
177 error = xfs_iaccess(tip, S_IWUSR, NULL);
178 if (error)
179 goto error0;
180
181 /* Verify that both files have the same format */
182 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
183 error = XFS_ERROR(EINVAL);
184 goto error0;
185 }
186
187 /* Verify both files are either real-time or non-realtime */
188 if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
189 (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
190 error = XFS_ERROR(EINVAL);
191 goto error0;
192 }
193
194 /* Should never get a local format */
195 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
196 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
197 error = XFS_ERROR(EINVAL);
198 goto error0;
199 }
200
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000201 if (VN_CACHED(tvp) != 0) {
Christoph Hellwig613d7042007-10-11 17:44:08 +1000202 xfs_inval_cached_trace(tip, 0, -1, 0, -1);
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000203 error = xfs_flushinval_pages(tip, 0, -1,
204 FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +1000205 if (error)
206 goto error0;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000207 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 /* Verify O_DIRECT for ftmp */
210 if (VN_CACHED(tvp) != 0) {
211 error = XFS_ERROR(EINVAL);
212 goto error0;
213 }
214
215 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100216 if (sxp->sx_offset != 0 ||
217 sxp->sx_length != ip->i_d.di_size ||
218 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 error = XFS_ERROR(EFAULT);
220 goto error0;
221 }
222
223 /*
224 * If the target has extended attributes, the tmp file
225 * must also in order to ensure the correct data fork
226 * format.
227 */
228 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
229 error = XFS_ERROR(EINVAL);
230 goto error0;
231 }
232
233 /*
234 * Compare the current change & modify times with that
235 * passed in. If they differ, we abort this swap.
236 * This is the mechanism used to ensure the calling
237 * process that the file was not changed out from
238 * under it.
239 */
240 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
241 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
242 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
243 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
244 error = XFS_ERROR(EBUSY);
245 goto error0;
246 }
247
248 /* We need to fail if the file is memory mapped. Once we have tossed
249 * all existing pages, the page fault will have no option
250 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000251 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 * until we have switched the extents.
253 */
254 if (VN_MAPPED(vp)) {
255 error = XFS_ERROR(EBUSY);
256 goto error0;
257 }
258
259 xfs_iunlock(ip, XFS_ILOCK_EXCL);
260 xfs_iunlock(tip, XFS_ILOCK_EXCL);
261
262 /*
263 * There is a race condition here since we gave up the
264 * ilock. However, the data fork will not change since
265 * we have the iolock (locked for truncation too) so we
266 * are safe. We don't really care if non-io related
267 * fields change.
268 */
269
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000270 xfs_tosspages(ip, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
273 if ((error = xfs_trans_reserve(tp, 0,
274 XFS_ICHANGE_LOG_RES(mp), 0,
275 0, 0))) {
276 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
277 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
278 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100279 locked = 0;
280 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
282 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
283
284 /*
285 * Count the number of extended attribute blocks
286 */
287 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
288 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
289 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
290 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100292 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
294 }
295 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
296 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
297 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
298 &taforkblks);
299 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100301 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
303 }
304
305 /*
306 * Swap the data forks of the inodes
307 */
308 ifp = &ip->i_df;
309 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100310 *tempifp = *ifp; /* struct copy */
311 *ifp = *tifp; /* struct copy */
312 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 /*
315 * Fix the on-disk inode values
316 */
317 tmp = (__uint64_t)ip->i_d.di_nblocks;
318 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
319 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
320
321 tmp = (__uint64_t) ip->i_d.di_nextents;
322 ip->i_d.di_nextents = tip->i_d.di_nextents;
323 tip->i_d.di_nextents = tmp;
324
325 tmp = (__uint64_t) ip->i_d.di_format;
326 ip->i_d.di_format = tip->i_d.di_format;
327 tip->i_d.di_format = tmp;
328
329 ilf_fields = XFS_ILOG_CORE;
330
331 switch(ip->i_d.di_format) {
332 case XFS_DINODE_FMT_EXTENTS:
333 /* If the extents fit in the inode, fix the
334 * pointer. Otherwise it's already NULL or
335 * pointing to the extent.
336 */
337 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
338 ifp->if_u1.if_extents =
339 ifp->if_u2.if_inline_ext;
340 }
341 ilf_fields |= XFS_ILOG_DEXT;
342 break;
343 case XFS_DINODE_FMT_BTREE:
344 ilf_fields |= XFS_ILOG_DBROOT;
345 break;
346 }
347
348 tilf_fields = XFS_ILOG_CORE;
349
350 switch(tip->i_d.di_format) {
351 case XFS_DINODE_FMT_EXTENTS:
352 /* If the extents fit in the inode, fix the
353 * pointer. Otherwise it's already NULL or
354 * pointing to the extent.
355 */
356 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
357 tifp->if_u1.if_extents =
358 tifp->if_u2.if_inline_ext;
359 }
360 tilf_fields |= XFS_ILOG_DEXT;
361 break;
362 case XFS_DINODE_FMT_BTREE:
363 tilf_fields |= XFS_ILOG_DBROOT;
364 break;
365 }
366
367 /*
368 * Increment vnode ref counts since xfs_trans_commit &
369 * xfs_trans_cancel will both unlock the inodes and
370 * decrement the associated ref counts.
371 */
372 VN_HOLD(vp);
373 VN_HOLD(tvp);
374
375 xfs_trans_ijoin(tp, ip, lock_flags);
376 xfs_trans_ijoin(tp, tip, lock_flags);
377
378 xfs_trans_log_inode(tp, ip, ilf_fields);
379 xfs_trans_log_inode(tp, tip, tilf_fields);
380
381 /*
382 * If this is a synchronous mount, make sure that the
383 * transaction goes to disk before returning to the user.
384 */
385 if (mp->m_flags & XFS_MOUNT_WSYNC) {
386 xfs_trans_set_sync(tp);
387 }
388
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000389 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100390 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 error0:
393 if (locked) {
394 xfs_iunlock(ip, lock_flags);
395 xfs_iunlock(tip, lock_flags);
396 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100397 if (tempifp != NULL)
398 kmem_free(tempifp, sizeof(xfs_ifork_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 return error;
400}