blob: 4fc9f39dd89e7b8ed64e271ca6ced6bc43a191f6 [file] [log] [blame]
Dave Chinner1fd71152013-08-12 20:49:35 +10001/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * 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.
13 *
14 * 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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
Dave Chinner70a98832013-10-23 10:36:05 +110020#include "xfs_shared.h"
Dave Chinner239880e2013-10-23 10:50:10 +110021#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
Dave Chinner1fd71152013-08-12 20:49:35 +100024#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
Dave Chinner1fd71152013-08-12 20:49:35 +100027#include "xfs_inode.h"
28#include "xfs_error.h"
29#include "xfs_cksum.h"
30#include "xfs_icache.h"
Dave Chinner239880e2013-10-23 10:50:10 +110031#include "xfs_trans.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110032#include "xfs_ialloc.h"
33#include "xfs_dinode.h"
Dave Chinner1fd71152013-08-12 20:49:35 +100034
35/*
36 * Check that none of the inode's in the buffer have a next
37 * unlinked field of 0.
38 */
39#if defined(DEBUG)
40void
41xfs_inobp_check(
42 xfs_mount_t *mp,
43 xfs_buf_t *bp)
44{
45 int i;
46 int j;
47 xfs_dinode_t *dip;
48
49 j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
50
51 for (i = 0; i < j; i++) {
52 dip = (xfs_dinode_t *)xfs_buf_offset(bp,
53 i * mp->m_sb.sb_inodesize);
54 if (!dip->di_next_unlinked) {
55 xfs_alert(mp,
Dave Chinner74ffa792013-09-03 21:47:38 +100056 "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
57 i, (long long)bp->b_bn);
Dave Chinner1fd71152013-08-12 20:49:35 +100058 }
59 }
60}
61#endif
62
Dave Chinnerd8914002013-08-27 11:39:37 +100063/*
64 * If we are doing readahead on an inode buffer, we might be in log recovery
65 * reading an inode allocation buffer that hasn't yet been replayed, and hence
66 * has not had the inode cores stamped into it. Hence for readahead, the buffer
67 * may be potentially invalid.
68 *
69 * If the readahead buffer is invalid, we don't want to mark it with an error,
70 * but we do want to clear the DONE status of the buffer so that a followup read
71 * will re-read it from disk. This will ensure that we don't get an unnecessary
72 * warnings during log recovery and we don't get unnecssary panics on debug
73 * kernels.
74 */
Dave Chinner1fd71152013-08-12 20:49:35 +100075static void
76xfs_inode_buf_verify(
Dave Chinnerd8914002013-08-27 11:39:37 +100077 struct xfs_buf *bp,
78 bool readahead)
Dave Chinner1fd71152013-08-12 20:49:35 +100079{
80 struct xfs_mount *mp = bp->b_target->bt_mount;
81 int i;
82 int ni;
83
84 /*
85 * Validate the magic number and version of every inode in the buffer
86 */
87 ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
88 for (i = 0; i < ni; i++) {
89 int di_ok;
90 xfs_dinode_t *dip;
91
92 dip = (struct xfs_dinode *)xfs_buf_offset(bp,
93 (i << mp->m_sb.sb_inodelog));
94 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
95 XFS_DINODE_GOOD_VERSION(dip->di_version);
96 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
97 XFS_ERRTAG_ITOBP_INOTOBP,
98 XFS_RANDOM_ITOBP_INOTOBP))) {
Dave Chinnerd8914002013-08-27 11:39:37 +100099 if (readahead) {
100 bp->b_flags &= ~XBF_DONE;
101 return;
102 }
103
Dave Chinner1fd71152013-08-12 20:49:35 +1000104 xfs_buf_ioerror(bp, EFSCORRUPTED);
105 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
106 mp, dip);
107#ifdef DEBUG
Dave Chinner74ffa792013-09-03 21:47:38 +1000108 xfs_alert(mp,
Dave Chinner1fd71152013-08-12 20:49:35 +1000109 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
110 (unsigned long long)bp->b_bn, i,
111 be16_to_cpu(dip->di_magic));
Dave Chinner1fd71152013-08-12 20:49:35 +1000112#endif
113 }
114 }
115 xfs_inobp_check(mp, bp);
116}
117
118
119static void
120xfs_inode_buf_read_verify(
121 struct xfs_buf *bp)
122{
Dave Chinnerd8914002013-08-27 11:39:37 +1000123 xfs_inode_buf_verify(bp, false);
124}
125
126static void
127xfs_inode_buf_readahead_verify(
128 struct xfs_buf *bp)
129{
130 xfs_inode_buf_verify(bp, true);
Dave Chinner1fd71152013-08-12 20:49:35 +1000131}
132
133static void
134xfs_inode_buf_write_verify(
135 struct xfs_buf *bp)
136{
Dave Chinnerd8914002013-08-27 11:39:37 +1000137 xfs_inode_buf_verify(bp, false);
Dave Chinner1fd71152013-08-12 20:49:35 +1000138}
139
140const struct xfs_buf_ops xfs_inode_buf_ops = {
141 .verify_read = xfs_inode_buf_read_verify,
142 .verify_write = xfs_inode_buf_write_verify,
143};
144
Dave Chinnerd8914002013-08-27 11:39:37 +1000145const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
146 .verify_read = xfs_inode_buf_readahead_verify,
147 .verify_write = xfs_inode_buf_write_verify,
148};
149
Dave Chinner1fd71152013-08-12 20:49:35 +1000150
151/*
152 * This routine is called to map an inode to the buffer containing the on-disk
153 * version of the inode. It returns a pointer to the buffer containing the
154 * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
155 * pointer to the on-disk inode within that buffer.
156 *
157 * If a non-zero error is returned, then the contents of bpp and dipp are
158 * undefined.
159 */
160int
161xfs_imap_to_bp(
162 struct xfs_mount *mp,
163 struct xfs_trans *tp,
164 struct xfs_imap *imap,
165 struct xfs_dinode **dipp,
166 struct xfs_buf **bpp,
167 uint buf_flags,
168 uint iget_flags)
169{
170 struct xfs_buf *bp;
171 int error;
172
173 buf_flags |= XBF_UNMAPPED;
174 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
175 (int)imap->im_len, buf_flags, &bp,
176 &xfs_inode_buf_ops);
177 if (error) {
178 if (error == EAGAIN) {
179 ASSERT(buf_flags & XBF_TRYLOCK);
180 return error;
181 }
182
183 if (error == EFSCORRUPTED &&
184 (iget_flags & XFS_IGET_UNTRUSTED))
185 return XFS_ERROR(EINVAL);
186
187 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
188 __func__, error);
189 return error;
190 }
191
192 *bpp = bp;
193 *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
194 return 0;
195}
196
Dave Chinner638f44162013-08-30 10:23:45 +1000197void
Dave Chinner1fd71152013-08-12 20:49:35 +1000198xfs_dinode_from_disk(
199 xfs_icdinode_t *to,
200 xfs_dinode_t *from)
201{
202 to->di_magic = be16_to_cpu(from->di_magic);
203 to->di_mode = be16_to_cpu(from->di_mode);
204 to->di_version = from ->di_version;
205 to->di_format = from->di_format;
206 to->di_onlink = be16_to_cpu(from->di_onlink);
207 to->di_uid = be32_to_cpu(from->di_uid);
208 to->di_gid = be32_to_cpu(from->di_gid);
209 to->di_nlink = be32_to_cpu(from->di_nlink);
210 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
211 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
212 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
213 to->di_flushiter = be16_to_cpu(from->di_flushiter);
214 to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
215 to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
216 to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
217 to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
218 to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
219 to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
220 to->di_size = be64_to_cpu(from->di_size);
221 to->di_nblocks = be64_to_cpu(from->di_nblocks);
222 to->di_extsize = be32_to_cpu(from->di_extsize);
223 to->di_nextents = be32_to_cpu(from->di_nextents);
224 to->di_anextents = be16_to_cpu(from->di_anextents);
225 to->di_forkoff = from->di_forkoff;
226 to->di_aformat = from->di_aformat;
227 to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
228 to->di_dmstate = be16_to_cpu(from->di_dmstate);
229 to->di_flags = be16_to_cpu(from->di_flags);
230 to->di_gen = be32_to_cpu(from->di_gen);
231
232 if (to->di_version == 3) {
233 to->di_changecount = be64_to_cpu(from->di_changecount);
234 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
235 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
236 to->di_flags2 = be64_to_cpu(from->di_flags2);
237 to->di_ino = be64_to_cpu(from->di_ino);
238 to->di_lsn = be64_to_cpu(from->di_lsn);
239 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
240 uuid_copy(&to->di_uuid, &from->di_uuid);
241 }
242}
243
244void
245xfs_dinode_to_disk(
246 xfs_dinode_t *to,
247 xfs_icdinode_t *from)
248{
249 to->di_magic = cpu_to_be16(from->di_magic);
250 to->di_mode = cpu_to_be16(from->di_mode);
251 to->di_version = from ->di_version;
252 to->di_format = from->di_format;
253 to->di_onlink = cpu_to_be16(from->di_onlink);
254 to->di_uid = cpu_to_be32(from->di_uid);
255 to->di_gid = cpu_to_be32(from->di_gid);
256 to->di_nlink = cpu_to_be32(from->di_nlink);
257 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
258 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
259 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
260 to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
261 to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
262 to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
263 to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
264 to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
265 to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
266 to->di_size = cpu_to_be64(from->di_size);
267 to->di_nblocks = cpu_to_be64(from->di_nblocks);
268 to->di_extsize = cpu_to_be32(from->di_extsize);
269 to->di_nextents = cpu_to_be32(from->di_nextents);
270 to->di_anextents = cpu_to_be16(from->di_anextents);
271 to->di_forkoff = from->di_forkoff;
272 to->di_aformat = from->di_aformat;
273 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
274 to->di_dmstate = cpu_to_be16(from->di_dmstate);
275 to->di_flags = cpu_to_be16(from->di_flags);
276 to->di_gen = cpu_to_be32(from->di_gen);
277
278 if (from->di_version == 3) {
279 to->di_changecount = cpu_to_be64(from->di_changecount);
280 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
281 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
282 to->di_flags2 = cpu_to_be64(from->di_flags2);
283 to->di_ino = cpu_to_be64(from->di_ino);
284 to->di_lsn = cpu_to_be64(from->di_lsn);
285 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
286 uuid_copy(&to->di_uuid, &from->di_uuid);
287 to->di_flushiter = 0;
288 } else {
289 to->di_flushiter = cpu_to_be16(from->di_flushiter);
290 }
291}
292
293static bool
294xfs_dinode_verify(
295 struct xfs_mount *mp,
296 struct xfs_inode *ip,
297 struct xfs_dinode *dip)
298{
299 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
300 return false;
301
302 /* only version 3 or greater inodes are extensively verified here */
303 if (dip->di_version < 3)
304 return true;
305
306 if (!xfs_sb_version_hascrc(&mp->m_sb))
307 return false;
308 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
309 offsetof(struct xfs_dinode, di_crc)))
310 return false;
311 if (be64_to_cpu(dip->di_ino) != ip->i_ino)
312 return false;
313 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
314 return false;
315 return true;
316}
317
318void
319xfs_dinode_calc_crc(
320 struct xfs_mount *mp,
321 struct xfs_dinode *dip)
322{
323 __uint32_t crc;
324
325 if (dip->di_version < 3)
326 return;
327
328 ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
329 crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
330 offsetof(struct xfs_dinode, di_crc));
331 dip->di_crc = xfs_end_cksum(crc);
332}
333
334/*
335 * Read the disk inode attributes into the in-core inode structure.
336 *
337 * For version 5 superblocks, if we are initialising a new inode and we are not
338 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
339 * inode core with a random generation number. If we are keeping inodes around,
340 * we need to read the inode cluster to get the existing generation number off
341 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
342 * format) then log recovery is dependent on the di_flushiter field being
343 * initialised from the current on-disk value and hence we must also read the
344 * inode off disk.
345 */
346int
347xfs_iread(
348 xfs_mount_t *mp,
349 xfs_trans_t *tp,
350 xfs_inode_t *ip,
351 uint iget_flags)
352{
353 xfs_buf_t *bp;
354 xfs_dinode_t *dip;
355 int error;
356
357 /*
358 * Fill in the location information in the in-core inode.
359 */
360 error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
361 if (error)
362 return error;
363
364 /* shortcut IO on inode allocation if possible */
365 if ((iget_flags & XFS_IGET_CREATE) &&
366 xfs_sb_version_hascrc(&mp->m_sb) &&
367 !(mp->m_flags & XFS_MOUNT_IKEEP)) {
368 /* initialise the on-disk inode core */
369 memset(&ip->i_d, 0, sizeof(ip->i_d));
370 ip->i_d.di_magic = XFS_DINODE_MAGIC;
371 ip->i_d.di_gen = prandom_u32();
372 if (xfs_sb_version_hascrc(&mp->m_sb)) {
373 ip->i_d.di_version = 3;
374 ip->i_d.di_ino = ip->i_ino;
375 uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
376 } else
377 ip->i_d.di_version = 2;
378 return 0;
379 }
380
381 /*
382 * Get pointers to the on-disk inode and the buffer containing it.
383 */
384 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
385 if (error)
386 return error;
387
388 /* even unallocated inodes are verified */
389 if (!xfs_dinode_verify(mp, ip, dip)) {
390 xfs_alert(mp, "%s: validation failed for inode %lld failed",
391 __func__, ip->i_ino);
392
393 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
394 error = XFS_ERROR(EFSCORRUPTED);
395 goto out_brelse;
396 }
397
398 /*
399 * If the on-disk inode is already linked to a directory
400 * entry, copy all of the inode into the in-core inode.
401 * xfs_iformat_fork() handles copying in the inode format
402 * specific information.
403 * Otherwise, just get the truly permanent information.
404 */
405 if (dip->di_mode) {
406 xfs_dinode_from_disk(&ip->i_d, dip);
407 error = xfs_iformat_fork(ip, dip);
408 if (error) {
409#ifdef DEBUG
410 xfs_alert(mp, "%s: xfs_iformat() returned error %d",
411 __func__, error);
412#endif /* DEBUG */
413 goto out_brelse;
414 }
415 } else {
416 /*
417 * Partial initialisation of the in-core inode. Just the bits
418 * that xfs_ialloc won't overwrite or relies on being correct.
419 */
420 ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
421 ip->i_d.di_version = dip->di_version;
422 ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
423 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
424
425 if (dip->di_version == 3) {
426 ip->i_d.di_ino = be64_to_cpu(dip->di_ino);
427 uuid_copy(&ip->i_d.di_uuid, &dip->di_uuid);
428 }
429
430 /*
431 * Make sure to pull in the mode here as well in
432 * case the inode is released without being used.
433 * This ensures that xfs_inactive() will see that
434 * the inode is already free and not try to mess
435 * with the uninitialized part of it.
436 */
437 ip->i_d.di_mode = 0;
438 }
439
440 /*
441 * The inode format changed when we moved the link count and
442 * made it 32 bits long. If this is an old format inode,
443 * convert it in memory to look like a new one. If it gets
444 * flushed to disk we will convert back before flushing or
445 * logging it. We zero out the new projid field and the old link
446 * count field. We'll handle clearing the pad field (the remains
447 * of the old uuid field) when we actually convert the inode to
448 * the new format. We don't change the version number so that we
449 * can distinguish this from a real new format inode.
450 */
451 if (ip->i_d.di_version == 1) {
452 ip->i_d.di_nlink = ip->i_d.di_onlink;
453 ip->i_d.di_onlink = 0;
454 xfs_set_projid(ip, 0);
455 }
456
457 ip->i_delayed_blks = 0;
458
459 /*
460 * Mark the buffer containing the inode as something to keep
461 * around for a while. This helps to keep recently accessed
462 * meta-data in-core longer.
463 */
464 xfs_buf_set_ref(bp, XFS_INO_REF);
465
466 /*
467 * Use xfs_trans_brelse() to release the buffer containing the on-disk
468 * inode, because it was acquired with xfs_trans_read_buf() in
469 * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
470 * brelse(). If we're within a transaction, then xfs_trans_brelse()
471 * will only release the buffer if it is not dirty within the
472 * transaction. It will be OK to release the buffer in this case,
473 * because inodes on disk are never destroyed and we will be locking the
474 * new in-core inode before putting it in the cache where other
475 * processes can find it. Thus we don't have to worry about the inode
476 * being changed just because we released the buffer.
477 */
478 out_brelse:
479 xfs_trans_brelse(tp, bp);
480 return error;
481}