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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);
Nathan Scott67fcaa72006-06-09 17:00:52 +1000202 bhv_vop_flushinval_pages(tvp, 0, -1, FI_REMAPF_LOCKED);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 /* Verify O_DIRECT for ftmp */
206 if (VN_CACHED(tvp) != 0) {
207 error = XFS_ERROR(EINVAL);
208 goto error0;
209 }
210
211 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100212 if (sxp->sx_offset != 0 ||
213 sxp->sx_length != ip->i_d.di_size ||
214 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 error = XFS_ERROR(EFAULT);
216 goto error0;
217 }
218
219 /*
220 * If the target has extended attributes, the tmp file
221 * must also in order to ensure the correct data fork
222 * format.
223 */
224 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
225 error = XFS_ERROR(EINVAL);
226 goto error0;
227 }
228
229 /*
230 * Compare the current change & modify times with that
231 * passed in. If they differ, we abort this swap.
232 * This is the mechanism used to ensure the calling
233 * process that the file was not changed out from
234 * under it.
235 */
236 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
237 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
238 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
239 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
240 error = XFS_ERROR(EBUSY);
241 goto error0;
242 }
243
244 /* We need to fail if the file is memory mapped. Once we have tossed
245 * all existing pages, the page fault will have no option
246 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000247 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 * until we have switched the extents.
249 */
250 if (VN_MAPPED(vp)) {
251 error = XFS_ERROR(EBUSY);
252 goto error0;
253 }
254
255 xfs_iunlock(ip, XFS_ILOCK_EXCL);
256 xfs_iunlock(tip, XFS_ILOCK_EXCL);
257
258 /*
259 * There is a race condition here since we gave up the
260 * ilock. However, the data fork will not change since
261 * we have the iolock (locked for truncation too) so we
262 * are safe. We don't really care if non-io related
263 * fields change.
264 */
265
Nathan Scott67fcaa72006-06-09 17:00:52 +1000266 bhv_vop_toss_pages(vp, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
269 if ((error = xfs_trans_reserve(tp, 0,
270 XFS_ICHANGE_LOG_RES(mp), 0,
271 0, 0))) {
272 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
273 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
274 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100275 locked = 0;
276 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
278 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
279
280 /*
281 * Count the number of extended attribute blocks
282 */
283 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
284 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
285 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
286 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100288 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
290 }
291 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
292 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
293 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
294 &taforkblks);
295 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100297 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
299 }
300
301 /*
302 * Swap the data forks of the inodes
303 */
304 ifp = &ip->i_df;
305 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100306 *tempifp = *ifp; /* struct copy */
307 *ifp = *tifp; /* struct copy */
308 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 /*
311 * Fix the on-disk inode values
312 */
313 tmp = (__uint64_t)ip->i_d.di_nblocks;
314 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
315 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
316
317 tmp = (__uint64_t) ip->i_d.di_nextents;
318 ip->i_d.di_nextents = tip->i_d.di_nextents;
319 tip->i_d.di_nextents = tmp;
320
321 tmp = (__uint64_t) ip->i_d.di_format;
322 ip->i_d.di_format = tip->i_d.di_format;
323 tip->i_d.di_format = tmp;
324
325 ilf_fields = XFS_ILOG_CORE;
326
327 switch(ip->i_d.di_format) {
328 case XFS_DINODE_FMT_EXTENTS:
329 /* If the extents fit in the inode, fix the
330 * pointer. Otherwise it's already NULL or
331 * pointing to the extent.
332 */
333 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
334 ifp->if_u1.if_extents =
335 ifp->if_u2.if_inline_ext;
336 }
337 ilf_fields |= XFS_ILOG_DEXT;
338 break;
339 case XFS_DINODE_FMT_BTREE:
340 ilf_fields |= XFS_ILOG_DBROOT;
341 break;
342 }
343
344 tilf_fields = XFS_ILOG_CORE;
345
346 switch(tip->i_d.di_format) {
347 case XFS_DINODE_FMT_EXTENTS:
348 /* If the extents fit in the inode, fix the
349 * pointer. Otherwise it's already NULL or
350 * pointing to the extent.
351 */
352 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
353 tifp->if_u1.if_extents =
354 tifp->if_u2.if_inline_ext;
355 }
356 tilf_fields |= XFS_ILOG_DEXT;
357 break;
358 case XFS_DINODE_FMT_BTREE:
359 tilf_fields |= XFS_ILOG_DBROOT;
360 break;
361 }
362
363 /*
364 * Increment vnode ref counts since xfs_trans_commit &
365 * xfs_trans_cancel will both unlock the inodes and
366 * decrement the associated ref counts.
367 */
368 VN_HOLD(vp);
369 VN_HOLD(tvp);
370
371 xfs_trans_ijoin(tp, ip, lock_flags);
372 xfs_trans_ijoin(tp, tip, lock_flags);
373
374 xfs_trans_log_inode(tp, ip, ilf_fields);
375 xfs_trans_log_inode(tp, tip, tilf_fields);
376
377 /*
378 * If this is a synchronous mount, make sure that the
379 * transaction goes to disk before returning to the user.
380 */
381 if (mp->m_flags & XFS_MOUNT_WSYNC) {
382 xfs_trans_set_sync(tp);
383 }
384
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000385 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100386 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 error0:
389 if (locked) {
390 xfs_iunlock(ip, lock_flags);
391 xfs_iunlock(tip, lock_flags);
392 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100393 if (tempifp != NULL)
394 kmem_free(tempifp, sizeof(xfs_ifork_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return error;
396}