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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * 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_dir.h"
28#include "xfs_dir2.h"
29#include "xfs_dmapi.h"
30#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_dir_sf.h"
35#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110036#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110039#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "xfs_bmap.h"
Nathan Scotta844f452005-11-02 14:38:42 +110041#include "xfs_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include "xfs_ialloc.h"
43#include "xfs_itable.h"
44#include "xfs_dfrag.h"
45#include "xfs_error.h"
46#include "xfs_mac.h"
47#include "xfs_rw.h"
48
49/*
50 * Syssgi interface for swapext
51 */
52int
53xfs_swapext(
Eric Sandeend0cfb372005-11-02 10:29:04 +110054 xfs_swapext_t __user *sxu)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Eric Sandeend0cfb372005-11-02 10:29:04 +110056 xfs_swapext_t *sxp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 xfs_inode_t *ip=NULL, *tip=NULL, *ips[2];
58 xfs_trans_t *tp;
59 xfs_mount_t *mp;
60 xfs_bstat_t *sbp;
61 struct file *fp = NULL, *tfp = NULL;
62 vnode_t *vp, *tvp;
Eric Sandeend0cfb372005-11-02 10:29:04 +110063 static uint lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 int ilf_fields, tilf_fields;
65 int error = 0;
Eric Sandeend0cfb372005-11-02 10:29:04 +110066 xfs_ifork_t *tempifp, *ifp, *tifp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 __uint64_t tmp;
68 int aforkblks = 0;
69 int taforkblks = 0;
Eric Sandeend0cfb372005-11-02 10:29:04 +110070 char locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Eric Sandeend0cfb372005-11-02 10:29:04 +110072 sxp = kmem_alloc(sizeof(xfs_swapext_t), KM_MAYFAIL);
73 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
74 if (!sxp || !tempifp) {
75 error = XFS_ERROR(ENOMEM);
76 goto error0;
77 }
78
79 if (copy_from_user(sxp, sxu, sizeof(xfs_swapext_t))) {
80 error = XFS_ERROR(EFAULT);
81 goto error0;
82 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 /* Pull information for the target fd */
Eric Sandeend0cfb372005-11-02 10:29:04 +110085 if (((fp = fget((int)sxp->sx_fdtarget)) == NULL) ||
Nathan Scottec86dc02006-03-17 17:25:36 +110086 ((vp = vn_from_inode(fp->f_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 ip = xfs_vtoi(vp);
92 if (ip == 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
Eric Sandeend0cfb372005-11-02 10:29:04 +110097 if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
Nathan Scottec86dc02006-03-17 17:25:36 +110098 ((tvp = vn_from_inode(tfp->f_dentry->d_inode)) == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 error = XFS_ERROR(EINVAL);
100 goto error0;
101 }
102
Christoph Hellwig75e17b32006-01-11 20:58:44 +1100103 tip = xfs_vtoi(tvp);
104 if (tip == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 error = XFS_ERROR(EBADF);
106 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 }
108
109 if (ip->i_mount != tip->i_mount) {
110 error = XFS_ERROR(EINVAL);
111 goto error0;
112 }
113
114 if (ip->i_ino == tip->i_ino) {
115 error = XFS_ERROR(EINVAL);
116 goto error0;
117 }
118
119 mp = ip->i_mount;
120
Eric Sandeend0cfb372005-11-02 10:29:04 +1100121 sbp = &sxp->sx_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 if (XFS_FORCED_SHUTDOWN(mp)) {
124 error = XFS_ERROR(EIO);
125 goto error0;
126 }
127
128 locked = 1;
129
130 /* Lock in i_ino order */
131 if (ip->i_ino < tip->i_ino) {
132 ips[0] = ip;
133 ips[1] = tip;
134 } else {
135 ips[0] = tip;
136 ips[1] = ip;
137 }
Eric Sandeend0cfb372005-11-02 10:29:04 +1100138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 xfs_lock_inodes(ips, 2, 0, lock_flags);
140
141 /* Check permissions */
142 error = xfs_iaccess(ip, S_IWUSR, NULL);
143 if (error)
144 goto error0;
145
146 error = xfs_iaccess(tip, S_IWUSR, NULL);
147 if (error)
148 goto error0;
149
150 /* Verify that both files have the same format */
151 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
152 error = XFS_ERROR(EINVAL);
153 goto error0;
154 }
155
156 /* Verify both files are either real-time or non-realtime */
157 if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
158 (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
159 error = XFS_ERROR(EINVAL);
160 goto error0;
161 }
162
163 /* Should never get a local format */
164 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
165 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
166 error = XFS_ERROR(EINVAL);
167 goto error0;
168 }
169
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000170 if (VN_CACHED(tvp) != 0) {
171 xfs_inval_cached_trace(&tip->i_iocore, 0, -1, 0, -1);
172 VOP_FLUSHINVAL_PAGES(tvp, 0, -1, FI_REMAPF_LOCKED);
173 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 /* Verify O_DIRECT for ftmp */
176 if (VN_CACHED(tvp) != 0) {
177 error = XFS_ERROR(EINVAL);
178 goto error0;
179 }
180
181 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100182 if (sxp->sx_offset != 0 ||
183 sxp->sx_length != ip->i_d.di_size ||
184 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 error = XFS_ERROR(EFAULT);
186 goto error0;
187 }
188
189 /*
190 * If the target has extended attributes, the tmp file
191 * must also in order to ensure the correct data fork
192 * format.
193 */
194 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
195 error = XFS_ERROR(EINVAL);
196 goto error0;
197 }
198
199 /*
200 * Compare the current change & modify times with that
201 * passed in. If they differ, we abort this swap.
202 * This is the mechanism used to ensure the calling
203 * process that the file was not changed out from
204 * under it.
205 */
206 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
207 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
208 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
209 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
210 error = XFS_ERROR(EBUSY);
211 goto error0;
212 }
213
214 /* We need to fail if the file is memory mapped. Once we have tossed
215 * all existing pages, the page fault will have no option
216 * but to go to the filesystem for pages. By making the page fault call
217 * VOP_READ (or write in the case of autogrow) they block on the iolock
218 * until we have switched the extents.
219 */
220 if (VN_MAPPED(vp)) {
221 error = XFS_ERROR(EBUSY);
222 goto error0;
223 }
224
225 xfs_iunlock(ip, XFS_ILOCK_EXCL);
226 xfs_iunlock(tip, XFS_ILOCK_EXCL);
227
228 /*
229 * There is a race condition here since we gave up the
230 * ilock. However, the data fork will not change since
231 * we have the iolock (locked for truncation too) so we
232 * are safe. We don't really care if non-io related
233 * fields change.
234 */
235
236 VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
237
238 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
239 if ((error = xfs_trans_reserve(tp, 0,
240 XFS_ICHANGE_LOG_RES(mp), 0,
241 0, 0))) {
242 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
243 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
244 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100245 locked = 0;
246 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
248 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
249
250 /*
251 * Count the number of extended attribute blocks
252 */
253 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
254 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
255 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
256 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100258 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 }
260 }
261 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
262 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
263 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
264 &taforkblks);
265 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 xfs_trans_cancel(tp, 0);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100267 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
269 }
270
271 /*
272 * Swap the data forks of the inodes
273 */
274 ifp = &ip->i_df;
275 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100276 *tempifp = *ifp; /* struct copy */
277 *ifp = *tifp; /* struct copy */
278 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280 /*
281 * Fix the on-disk inode values
282 */
283 tmp = (__uint64_t)ip->i_d.di_nblocks;
284 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
285 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
286
287 tmp = (__uint64_t) ip->i_d.di_nextents;
288 ip->i_d.di_nextents = tip->i_d.di_nextents;
289 tip->i_d.di_nextents = tmp;
290
291 tmp = (__uint64_t) ip->i_d.di_format;
292 ip->i_d.di_format = tip->i_d.di_format;
293 tip->i_d.di_format = tmp;
294
295 ilf_fields = XFS_ILOG_CORE;
296
297 switch(ip->i_d.di_format) {
298 case XFS_DINODE_FMT_EXTENTS:
299 /* If the extents fit in the inode, fix the
300 * pointer. Otherwise it's already NULL or
301 * pointing to the extent.
302 */
303 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
304 ifp->if_u1.if_extents =
305 ifp->if_u2.if_inline_ext;
306 }
307 ilf_fields |= XFS_ILOG_DEXT;
308 break;
309 case XFS_DINODE_FMT_BTREE:
310 ilf_fields |= XFS_ILOG_DBROOT;
311 break;
312 }
313
314 tilf_fields = XFS_ILOG_CORE;
315
316 switch(tip->i_d.di_format) {
317 case XFS_DINODE_FMT_EXTENTS:
318 /* If the extents fit in the inode, fix the
319 * pointer. Otherwise it's already NULL or
320 * pointing to the extent.
321 */
322 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
323 tifp->if_u1.if_extents =
324 tifp->if_u2.if_inline_ext;
325 }
326 tilf_fields |= XFS_ILOG_DEXT;
327 break;
328 case XFS_DINODE_FMT_BTREE:
329 tilf_fields |= XFS_ILOG_DBROOT;
330 break;
331 }
332
333 /*
334 * Increment vnode ref counts since xfs_trans_commit &
335 * xfs_trans_cancel will both unlock the inodes and
336 * decrement the associated ref counts.
337 */
338 VN_HOLD(vp);
339 VN_HOLD(tvp);
340
341 xfs_trans_ijoin(tp, ip, lock_flags);
342 xfs_trans_ijoin(tp, tip, lock_flags);
343
344 xfs_trans_log_inode(tp, ip, ilf_fields);
345 xfs_trans_log_inode(tp, tip, tilf_fields);
346
347 /*
348 * If this is a synchronous mount, make sure that the
349 * transaction goes to disk before returning to the user.
350 */
351 if (mp->m_flags & XFS_MOUNT_WSYNC) {
352 xfs_trans_set_sync(tp);
353 }
354
355 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT, NULL);
Eric Sandeend0cfb372005-11-02 10:29:04 +1100356 locked = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 error0:
359 if (locked) {
360 xfs_iunlock(ip, lock_flags);
361 xfs_iunlock(tip, lock_flags);
362 }
363
Eric Sandeend0cfb372005-11-02 10:29:04 +1100364 if (fp != NULL)
365 fput(fp);
366 if (tfp != NULL)
367 fput(tfp);
368
369 if (sxp != NULL)
370 kmem_free(sxp, sizeof(xfs_swapext_t));
371 if (tempifp != NULL)
372 kmem_free(tempifp, sizeof(xfs_ifork_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 return error;
375}