blob: 7465f9ee125fcc2b80194043e9c141799a05ffde [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(
sandeen@sandeen.net743bb462008-11-25 21:20:06 -060052 xfs_swapext_t *sxp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110054 xfs_inode_t *ip, *tip;
55 struct file *file, *target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 /* Pull information for the target fd */
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110059 file = fget((int)sxp->sx_fdtarget);
60 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 error = XFS_ERROR(EINVAL);
Eric Sandeenac12b4e2009-01-25 20:53:00 -060062 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 }
64
Christoph Hellwigf6aa7f22008-02-05 12:13:15 +110065 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) {
66 error = XFS_ERROR(EBADF);
67 goto out_put_file;
68 }
69
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110070 target_file = fget((int)sxp->sx_fdtmp);
71 if (!target_file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 error = XFS_ERROR(EINVAL);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110073 goto out_put_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
75
Christoph Hellwigf6aa7f22008-02-05 12:13:15 +110076 if (!(target_file->f_mode & FMODE_WRITE) ||
77 (target_file->f_flags & O_APPEND)) {
78 error = XFS_ERROR(EBADF);
79 goto out_put_target_file;
80 }
81
Christoph Hellwig7c8f7af2009-02-12 19:56:00 +010082 if (IS_SWAPFILE(file->f_path.dentry->d_inode) ||
83 IS_SWAPFILE(target_file->f_path.dentry->d_inode)) {
84 error = XFS_ERROR(EINVAL);
85 goto out_put_target_file;
86 }
87
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110088 ip = XFS_I(file->f_path.dentry->d_inode);
89 tip = XFS_I(target_file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 if (ip->i_mount != tip->i_mount) {
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110092 error = XFS_ERROR(EINVAL);
93 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
95
96 if (ip->i_ino == tip->i_ino) {
Christoph Hellwig35fec8d2008-02-05 12:13:07 +110097 error = XFS_ERROR(EINVAL);
98 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 }
100
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100101 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
102 error = XFS_ERROR(EIO);
103 goto out_put_target_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000106 error = xfs_swap_extents(ip, tip, sxp);
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000107
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100108 out_put_target_file:
109 fput(target_file);
110 out_put_file:
111 fput(file);
Christoph Hellwig35fec8d2008-02-05 12:13:07 +1100112 out:
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000113 return error;
114}
115
116int
117xfs_swap_extents(
118 xfs_inode_t *ip,
119 xfs_inode_t *tip,
120 xfs_swapext_t *sxp)
121{
122 xfs_mount_t *mp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000123 xfs_trans_t *tp;
124 xfs_bstat_t *sbp = &sxp->sx_stat;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000125 xfs_ifork_t *tempifp, *ifp, *tifp;
126 int ilf_fields, tilf_fields;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000127 int error = 0;
128 int aforkblks = 0;
129 int taforkblks = 0;
130 __uint64_t tmp;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000131
132 mp = ip->i_mount;
133
134 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
135 if (!tempifp) {
136 error = XFS_ERROR(ENOMEM);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100137 goto out;
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000138 }
139
140 sbp = &sxp->sx_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
David Chinnerf9114eb2008-09-17 16:51:21 +1000142 /*
143 * we have to do two separate lock calls here to keep lockdep
144 * happy. If we try to get all the locks in one call, lock will
145 * report false positives when we drop the ILOCK and regain them
146 * below.
147 */
148 xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
149 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 /* Verify that both files have the same format */
152 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
153 error = XFS_ERROR(EINVAL);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100154 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156
157 /* Verify both files are either real-time or non-realtime */
Eric Sandeen71ddabb2007-11-23 16:29:42 +1100158 if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 error = XFS_ERROR(EINVAL);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100160 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 }
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);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100167 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000170 if (VN_CACHED(VFS_I(tip)) != 0) {
Christoph Hellwig613d7042007-10-11 17:44:08 +1000171 xfs_inval_cached_trace(tip, 0, -1, 0, -1);
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000172 error = xfs_flushinval_pages(tip, 0, -1,
173 FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +1000174 if (error)
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100175 goto out_unlock;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +1000176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 /* Verify O_DIRECT for ftmp */
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000179 if (VN_CACHED(VFS_I(tip)) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 error = XFS_ERROR(EINVAL);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100181 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
183
184 /* Verify all data are being swapped */
Eric Sandeend0cfb372005-11-02 10:29:04 +1100185 if (sxp->sx_offset != 0 ||
186 sxp->sx_length != ip->i_d.di_size ||
187 sxp->sx_length != tip->i_d.di_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 error = XFS_ERROR(EFAULT);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100189 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 }
191
192 /*
193 * If the target has extended attributes, the tmp file
194 * must also in order to ensure the correct data fork
195 * format.
196 */
197 if ( XFS_IFORK_Q(ip) != XFS_IFORK_Q(tip) ) {
198 error = XFS_ERROR(EINVAL);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100199 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
201
202 /*
203 * Compare the current change & modify times with that
204 * passed in. If they differ, we abort this swap.
205 * This is the mechanism used to ensure the calling
206 * process that the file was not changed out from
207 * under it.
208 */
209 if ((sbp->bs_ctime.tv_sec != ip->i_d.di_ctime.t_sec) ||
210 (sbp->bs_ctime.tv_nsec != ip->i_d.di_ctime.t_nsec) ||
211 (sbp->bs_mtime.tv_sec != ip->i_d.di_mtime.t_sec) ||
212 (sbp->bs_mtime.tv_nsec != ip->i_d.di_mtime.t_nsec)) {
213 error = XFS_ERROR(EBUSY);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100214 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216
217 /* We need to fail if the file is memory mapped. Once we have tossed
218 * all existing pages, the page fault will have no option
219 * but to go to the filesystem for pages. By making the page fault call
Nathan Scott67fcaa72006-06-09 17:00:52 +1000220 * vop_read (or write in the case of autogrow) they block on the iolock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 * until we have switched the extents.
222 */
Christoph Hellwigdf80c932008-08-13 16:22:09 +1000223 if (VN_MAPPED(VFS_I(ip))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 error = XFS_ERROR(EBUSY);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100225 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227
228 xfs_iunlock(ip, XFS_ILOCK_EXCL);
229 xfs_iunlock(tip, XFS_ILOCK_EXCL);
230
231 /*
232 * There is a race condition here since we gave up the
233 * ilock. However, the data fork will not change since
234 * we have the iolock (locked for truncation too) so we
235 * are safe. We don't really care if non-io related
236 * fields change.
237 */
238
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000239 xfs_tosspages(ip, 0, -1, FI_REMAPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
242 if ((error = xfs_trans_reserve(tp, 0,
243 XFS_ICHANGE_LOG_RES(mp), 0,
244 0, 0))) {
245 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
246 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
247 xfs_trans_cancel(tp, 0);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100248 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
Christoph Hellwige1cccd92008-08-13 16:18:07 +1000250 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 /*
253 * Count the number of extended attribute blocks
254 */
255 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
256 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
257 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100258 if (error)
259 goto out_trans_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 }
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);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100265 if (error)
266 goto out_trans_cancel;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
269 /*
270 * Swap the data forks of the inodes
271 */
272 ifp = &ip->i_df;
273 tifp = &tip->i_df;
Eric Sandeend0cfb372005-11-02 10:29:04 +1100274 *tempifp = *ifp; /* struct copy */
275 *ifp = *tifp; /* struct copy */
276 *tifp = *tempifp; /* struct copy */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 /*
279 * Fix the on-disk inode values
280 */
281 tmp = (__uint64_t)ip->i_d.di_nblocks;
282 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
283 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
284
285 tmp = (__uint64_t) ip->i_d.di_nextents;
286 ip->i_d.di_nextents = tip->i_d.di_nextents;
287 tip->i_d.di_nextents = tmp;
288
289 tmp = (__uint64_t) ip->i_d.di_format;
290 ip->i_d.di_format = tip->i_d.di_format;
291 tip->i_d.di_format = tmp;
292
293 ilf_fields = XFS_ILOG_CORE;
294
295 switch(ip->i_d.di_format) {
296 case XFS_DINODE_FMT_EXTENTS:
297 /* If the extents fit in the inode, fix the
298 * pointer. Otherwise it's already NULL or
299 * pointing to the extent.
300 */
301 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
302 ifp->if_u1.if_extents =
303 ifp->if_u2.if_inline_ext;
304 }
305 ilf_fields |= XFS_ILOG_DEXT;
306 break;
307 case XFS_DINODE_FMT_BTREE:
308 ilf_fields |= XFS_ILOG_DBROOT;
309 break;
310 }
311
312 tilf_fields = XFS_ILOG_CORE;
313
314 switch(tip->i_d.di_format) {
315 case XFS_DINODE_FMT_EXTENTS:
316 /* If the extents fit in the inode, fix the
317 * pointer. Otherwise it's already NULL or
318 * pointing to the extent.
319 */
320 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
321 tifp->if_u1.if_extents =
322 tifp->if_u2.if_inline_ext;
323 }
324 tilf_fields |= XFS_ILOG_DEXT;
325 break;
326 case XFS_DINODE_FMT_BTREE:
327 tilf_fields |= XFS_ILOG_DBROOT;
328 break;
329 }
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Christoph Hellwig0b1f91772008-08-13 16:13:09 +1000332 IHOLD(ip);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100333 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
Christoph Hellwig0b1f91772008-08-13 16:13:09 +1000334
335 IHOLD(tip);
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100336 xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 xfs_trans_log_inode(tp, ip, ilf_fields);
339 xfs_trans_log_inode(tp, tip, tilf_fields);
340
341 /*
342 * If this is a synchronous mount, make sure that the
343 * transaction goes to disk before returning to the user.
344 */
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100345 if (mp->m_flags & XFS_MOUNT_WSYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 xfs_trans_set_sync(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000348 error = xfs_trans_commit(tp, XFS_TRANS_SWAPEXT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100350out:
351 kmem_free(tempifp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return error;
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100353
Felix Blyakher1f239202009-05-07 19:49:45 -0500354out_unlock:
355 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
356 xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
357 goto out;
358
Josef 'Jeff' Sipekef8f7fc2009-02-04 09:37:43 +0100359out_trans_cancel:
360 xfs_trans_cancel(tp, 0);
361 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}