1 /*
2 * journal.c --- code for handling the "ext3" journal
3 *
4 * Copyright (C) 2000 Andreas Dilger
5 * Copyright (C) 2000 Theodore Ts'o
6 *
7 * Parts of the code are based on fs/jfs/journal.c by Stephen C. Tweedie
8 * Copyright (C) 1999 Red Hat Software
9 *
10 * This file may be redistributed under the terms of the
11 * GNU General Public License version 2 or at your discretion
12 * any later version.
13 */
14
15 #include "config.h"
16 #ifdef HAVE_SYS_MOUNT_H
17 #include <sys/param.h>
18 #include <sys/mount.h>
19 #define MNT_FL (MS_MGC_VAL | MS_RDONLY)
20 #endif
21 #ifdef HAVE_SYS_STAT_H
22 #include <sys/stat.h>
23 #endif
24
25 #define E2FSCK_INCLUDE_INLINE_FUNCS
26 #include "uuid/uuid.h"
27 #include "journal.h"
28
29 #ifdef CONFIG_JBD_DEBUG /* Enabled by configure --enable-jfs-debug */
30 static int bh_count = 0;
31 #endif
32
33 #if EXT2_FLAT_INCLUDES
34 #include "blkid.h"
35 #else
36 #include "blkid/blkid.h"
37 #endif
38
39 /*
40 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
41 * This creates a larger static binary, and a smaller binary using
42 * shared libraries. It's also probably slightly less CPU-efficient,
43 * which is why it's not on by default. But, it's a good way of
44 * testing the functions in inode_io.c and fileio.c.
45 */
46 #undef USE_INODE_IO
47
48 /* Checksumming functions */
ext2fs_journal_verify_csum_type(journal_t * j,journal_superblock_t * jsb)49 static int ext2fs_journal_verify_csum_type(journal_t *j,
50 journal_superblock_t *jsb)
51 {
52 if (!journal_has_csum_v2or3(j))
53 return 1;
54
55 return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
56 }
57
ext2fs_journal_sb_csum(journal_superblock_t * jsb)58 static __u32 ext2fs_journal_sb_csum(journal_superblock_t *jsb)
59 {
60 __u32 crc, old_crc;
61
62 old_crc = jsb->s_checksum;
63 jsb->s_checksum = 0;
64 crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
65 sizeof(journal_superblock_t));
66 jsb->s_checksum = old_crc;
67
68 return crc;
69 }
70
ext2fs_journal_sb_csum_verify(journal_t * j,journal_superblock_t * jsb)71 static int ext2fs_journal_sb_csum_verify(journal_t *j,
72 journal_superblock_t *jsb)
73 {
74 __u32 provided, calculated;
75
76 if (!journal_has_csum_v2or3(j))
77 return 1;
78
79 provided = ext2fs_be32_to_cpu(jsb->s_checksum);
80 calculated = ext2fs_journal_sb_csum(jsb);
81
82 return provided == calculated;
83 }
84
ext2fs_journal_sb_csum_set(journal_t * j,journal_superblock_t * jsb)85 static errcode_t ext2fs_journal_sb_csum_set(journal_t *j,
86 journal_superblock_t *jsb)
87 {
88 __u32 crc;
89
90 if (!journal_has_csum_v2or3(j))
91 return 0;
92
93 crc = ext2fs_journal_sb_csum(jsb);
94 jsb->s_checksum = ext2fs_cpu_to_be32(crc);
95 return 0;
96 }
97
98 /* Kernel compatibility functions for handling the journal. These allow us
99 * to use the recovery.c file virtually unchanged from the kernel, so we
100 * don't have to do much to keep kernel and user recovery in sync.
101 */
journal_bmap(journal_t * journal,blk64_t block,unsigned long long * phys)102 int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys)
103 {
104 #ifdef USE_INODE_IO
105 *phys = block;
106 return 0;
107 #else
108 struct inode *inode = journal->j_inode;
109 errcode_t retval;
110 blk64_t pblk;
111
112 if (!inode) {
113 *phys = block;
114 return 0;
115 }
116
117 retval = ext2fs_bmap2(inode->i_fs, inode->i_ino,
118 &inode->i_ext2, NULL, 0, block, 0, &pblk);
119 *phys = pblk;
120 return (int) retval;
121 #endif
122 }
123
getblk(kdev_t kdev,blk64_t blocknr,int blocksize)124 struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
125 {
126 struct buffer_head *bh;
127 int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
128 sizeof(bh->b_data);
129 errcode_t retval;
130
131 retval = ext2fs_get_memzero(bufsize, &bh);
132 if (retval)
133 return NULL;
134
135 #ifdef CONFIG_JBD_DEBUG
136 if (journal_enable_debug >= 3)
137 bh_count++;
138 #endif
139 jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
140 (unsigned long long) blocknr, blocksize, bh_count);
141
142 bh->b_fs = kdev->k_fs;
143 if (kdev->k_dev == K_DEV_FS)
144 bh->b_io = kdev->k_fs->io;
145 else
146 bh->b_io = kdev->k_fs->journal_io;
147 bh->b_size = blocksize;
148 bh->b_blocknr = blocknr;
149
150 return bh;
151 }
152
sync_blockdev(kdev_t kdev)153 int sync_blockdev(kdev_t kdev)
154 {
155 io_channel io;
156
157 if (kdev->k_dev == K_DEV_FS)
158 io = kdev->k_fs->io;
159 else
160 io = kdev->k_fs->journal_io;
161
162 return io_channel_flush(io) ? EIO : 0;
163 }
164
ll_rw_block(int rw,int nr,struct buffer_head * bhp[])165 void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
166 {
167 errcode_t retval;
168 struct buffer_head *bh;
169
170 for (; nr > 0; --nr) {
171 bh = *bhp++;
172 if (rw == READ && !bh->b_uptodate) {
173 jfs_debug(3, "reading block %llu/%p\n",
174 bh->b_blocknr, (void *) bh);
175 retval = io_channel_read_blk64(bh->b_io,
176 bh->b_blocknr,
177 1, bh->b_data);
178 if (retval) {
179 com_err(bh->b_fs->device_name, retval,
180 "while reading block %llu\n",
181 bh->b_blocknr);
182 bh->b_err = (int) retval;
183 continue;
184 }
185 bh->b_uptodate = 1;
186 } else if (rw == WRITE && bh->b_dirty) {
187 jfs_debug(3, "writing block %llu/%p\n",
188 bh->b_blocknr,
189 (void *) bh);
190 retval = io_channel_write_blk64(bh->b_io,
191 bh->b_blocknr,
192 1, bh->b_data);
193 if (retval) {
194 com_err(bh->b_fs->device_name, retval,
195 "while writing block %llu\n",
196 bh->b_blocknr);
197 bh->b_err = (int) retval;
198 continue;
199 }
200 bh->b_dirty = 0;
201 bh->b_uptodate = 1;
202 } else {
203 jfs_debug(3, "no-op %s for block %llu\n",
204 rw == READ ? "read" : "write",
205 bh->b_blocknr);
206 }
207 }
208 }
209
mark_buffer_dirty(struct buffer_head * bh)210 void mark_buffer_dirty(struct buffer_head *bh)
211 {
212 bh->b_dirty = 1;
213 }
214
mark_buffer_clean(struct buffer_head * bh)215 static void mark_buffer_clean(struct buffer_head *bh)
216 {
217 bh->b_dirty = 0;
218 }
219
brelse(struct buffer_head * bh)220 void brelse(struct buffer_head *bh)
221 {
222 if (bh->b_dirty)
223 ll_rw_block(WRITE, 1, &bh);
224 jfs_debug(3, "freeing block %llu/%p (total %d)\n",
225 bh->b_blocknr, (void *) bh, --bh_count);
226 ext2fs_free_mem(&bh);
227 }
228
buffer_uptodate(struct buffer_head * bh)229 int buffer_uptodate(struct buffer_head *bh)
230 {
231 return bh->b_uptodate;
232 }
233
mark_buffer_uptodate(struct buffer_head * bh,int val)234 void mark_buffer_uptodate(struct buffer_head *bh, int val)
235 {
236 bh->b_uptodate = val;
237 }
238
wait_on_buffer(struct buffer_head * bh)239 void wait_on_buffer(struct buffer_head *bh)
240 {
241 if (!bh->b_uptodate)
242 ll_rw_block(READ, 1, &bh);
243 }
244
245
ext2fs_clear_recover(ext2_filsys fs,int error)246 static void ext2fs_clear_recover(ext2_filsys fs, int error)
247 {
248 ext2fs_clear_feature_journal_needs_recovery(fs->super);
249
250 /* if we had an error doing journal recovery, we need a full fsck */
251 if (error)
252 fs->super->s_state &= ~EXT2_VALID_FS;
253 /*
254 * If we replayed the journal by definition the file system
255 * was mounted since the last time it was checked
256 */
257 if (fs->super->s_lastcheck >= fs->super->s_mtime)
258 fs->super->s_lastcheck = fs->super->s_mtime - 1;
259 ext2fs_mark_super_dirty(fs);
260 }
261
262 /*
263 * This is a helper function to check the validity of the journal.
264 */
265 struct process_block_struct {
266 e2_blkcnt_t last_block;
267 };
268
process_journal_block(ext2_filsys fs,blk64_t * block_nr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)269 static int process_journal_block(ext2_filsys fs,
270 blk64_t *block_nr,
271 e2_blkcnt_t blockcnt,
272 blk64_t ref_block EXT2FS_ATTR((unused)),
273 int ref_offset EXT2FS_ATTR((unused)),
274 void *priv_data)
275 {
276 struct process_block_struct *p;
277 blk64_t blk = *block_nr;
278
279 p = (struct process_block_struct *) priv_data;
280
281 if (!blk || blk < fs->super->s_first_data_block ||
282 blk >= ext2fs_blocks_count(fs->super))
283 return BLOCK_ABORT;
284
285 if (blockcnt >= 0)
286 p->last_block = blockcnt;
287 return 0;
288 }
289
ext2fs_get_journal(ext2_filsys fs,journal_t ** ret_journal)290 static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal)
291 {
292 struct process_block_struct pb;
293 struct ext2_super_block *sb = fs->super;
294 struct ext2_super_block jsuper;
295 struct buffer_head *bh;
296 struct inode *j_inode = NULL;
297 struct kdev_s *dev_fs = NULL, *dev_journal;
298 const char *journal_name = 0;
299 journal_t *journal = NULL;
300 errcode_t retval = 0;
301 io_manager io_ptr = 0;
302 unsigned long long start = 0;
303 int ext_journal = 0;
304 int tried_backup_jnl = 0;
305
306 retval = ext2fs_get_memzero(sizeof(journal_t), &journal);
307 if (retval)
308 return retval;
309
310 retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs);
311 if (retval)
312 goto errout;
313 dev_journal = dev_fs+1;
314
315 dev_fs->k_fs = dev_journal->k_fs = fs;
316 dev_fs->k_dev = K_DEV_FS;
317 dev_journal->k_dev = K_DEV_JOURNAL;
318
319 journal->j_dev = dev_journal;
320 journal->j_fs_dev = dev_fs;
321 journal->j_inode = NULL;
322 journal->j_blocksize = fs->blocksize;
323
324 if (uuid_is_null(sb->s_journal_uuid)) {
325 if (!sb->s_journal_inum) {
326 retval = EXT2_ET_BAD_INODE_NUM;
327 goto errout;
328 }
329 retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode);
330 if (retval)
331 goto errout;
332
333 j_inode->i_fs = fs;
334 j_inode->i_ino = sb->s_journal_inum;
335
336 retval = ext2fs_read_inode(fs, sb->s_journal_inum,
337 &j_inode->i_ext2);
338 if (retval) {
339 try_backup_journal:
340 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
341 tried_backup_jnl)
342 goto errout;
343 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
344 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
345 EXT2_N_BLOCKS*4);
346 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
347 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
348 j_inode->i_ext2.i_links_count = 1;
349 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
350 tried_backup_jnl++;
351 }
352 if (!j_inode->i_ext2.i_links_count ||
353 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
354 retval = EXT2_ET_NO_JOURNAL;
355 goto try_backup_journal;
356 }
357 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
358 JFS_MIN_JOURNAL_BLOCKS) {
359 retval = EXT2_ET_JOURNAL_TOO_SMALL;
360 goto try_backup_journal;
361 }
362 pb.last_block = -1;
363 retval = ext2fs_block_iterate3(fs, j_inode->i_ino,
364 BLOCK_FLAG_HOLE, 0,
365 process_journal_block, &pb);
366 if ((pb.last_block + 1) * fs->blocksize <
367 (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
368 retval = EXT2_ET_JOURNAL_TOO_SMALL;
369 goto try_backup_journal;
370 }
371 if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) {
372 retval = ext2fs_write_inode(fs, sb->s_journal_inum,
373 &j_inode->i_ext2);
374 if (retval)
375 goto errout;
376 }
377
378 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
379 journal->j_blocksize;
380
381 #ifdef USE_INODE_IO
382 retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum,
383 &j_inode->i_ext2,
384 &journal_name);
385 if (retval)
386 goto errout;
387
388 io_ptr = inode_io_manager;
389 #else
390 journal->j_inode = j_inode;
391 fs->journal_io = fs->io;
392 retval = (errcode_t)journal_bmap(journal, 0, &start);
393 if (retval)
394 goto errout;
395 #endif
396 } else {
397 ext_journal = 1;
398 if (!fs->journal_name) {
399 char uuid[37];
400 blkid_cache blkid;
401
402 blkid_get_cache(&blkid, NULL);
403 uuid_unparse(sb->s_journal_uuid, uuid);
404 fs->journal_name = blkid_get_devname(blkid,
405 "UUID", uuid);
406 if (!fs->journal_name)
407 fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
408 blkid_put_cache(blkid);
409 }
410 journal_name = fs->journal_name;
411
412 if (!journal_name) {
413 retval = EXT2_ET_LOAD_EXT_JOURNAL;
414 goto errout;
415 }
416
417 jfs_debug(1, "Using journal file %s\n", journal_name);
418 io_ptr = unix_io_manager;
419 }
420
421 #if 0
422 test_io_backing_manager = io_ptr;
423 io_ptr = test_io_manager;
424 #endif
425 #ifndef USE_INODE_IO
426 if (ext_journal)
427 #endif
428 {
429 retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW,
430 &fs->journal_io);
431 }
432 if (retval)
433 goto errout;
434
435 io_channel_set_blksize(fs->journal_io, fs->blocksize);
436
437 if (ext_journal) {
438 blk64_t maxlen;
439
440 start = ext2fs_journal_sb_start(fs->blocksize) - 1;
441 bh = getblk(dev_journal, start, fs->blocksize);
442 if (!bh) {
443 retval = EXT2_ET_NO_MEMORY;
444 goto errout;
445 }
446 ll_rw_block(READ, 1, &bh);
447 retval = bh->b_err;
448 if (retval) {
449 brelse(bh);
450 goto errout;
451 }
452 memcpy(&jsuper, start ? bh->b_data :
453 bh->b_data + SUPERBLOCK_OFFSET,
454 sizeof(jsuper));
455 #ifdef WORDS_BIGENDIAN
456 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
457 ext2fs_swap_super(&jsuper);
458 #endif
459 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
460 !ext2fs_has_feature_journal_dev(&jsuper)) {
461 retval = EXT2_ET_LOAD_EXT_JOURNAL;
462 brelse(bh);
463 goto errout;
464 }
465 /* Make sure the journal UUID is correct */
466 if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid,
467 sizeof(jsuper.s_uuid))) {
468 retval = EXT2_ET_LOAD_EXT_JOURNAL;
469 brelse(bh);
470 goto errout;
471 }
472
473 /* Check the superblock checksum */
474 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
475 struct struct_ext2_filsys fsx;
476 struct ext2_super_block superx;
477 void *p;
478
479 p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
480 memcpy(&fsx, fs, sizeof(fsx));
481 memcpy(&superx, fs->super, sizeof(superx));
482 fsx.super = &superx;
483 ext2fs_set_feature_metadata_csum(fsx.super);
484 if (!ext2fs_superblock_csum_verify(&fsx, p)) {
485 retval = EXT2_ET_LOAD_EXT_JOURNAL;
486 brelse(bh);
487 goto errout;
488 }
489 }
490 brelse(bh);
491
492 maxlen = ext2fs_blocks_count(&jsuper);
493 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen :
494 (1ULL << 32) - 1;
495 start++;
496 }
497
498 bh = getblk(dev_journal, start, journal->j_blocksize);
499 if (!bh) {
500 retval = EXT2_ET_NO_MEMORY;
501 goto errout;
502 }
503
504 journal->j_sb_buffer = bh;
505 journal->j_superblock = (journal_superblock_t *)bh->b_data;
506
507 #ifdef USE_INODE_IO
508 if (j_inode)
509 ext2fs_free_mem(&j_inode);
510 #endif
511
512 *ret_journal = journal;
513 return 0;
514
515 errout:
516 if (dev_fs)
517 ext2fs_free_mem(&dev_fs);
518 if (j_inode)
519 ext2fs_free_mem(&j_inode);
520 if (journal)
521 ext2fs_free_mem(&journal);
522 return retval;
523 }
524
ext2fs_journal_fix_bad_inode(ext2_filsys fs)525 static errcode_t ext2fs_journal_fix_bad_inode(ext2_filsys fs)
526 {
527 struct ext2_super_block *sb = fs->super;
528 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
529 int has_journal = ext2fs_has_feature_journal(fs->super);
530
531 if (has_journal || sb->s_journal_inum) {
532 /* The journal inode is bogus, remove and force full fsck */
533 return EXT2_ET_BAD_INODE_NUM;
534 } else if (recover) {
535 return EXT2_ET_UNSUPP_FEATURE;
536 }
537 return 0;
538 }
539
540 #define V1_SB_SIZE 0x0024
clear_v2_journal_fields(journal_t * journal)541 static void clear_v2_journal_fields(journal_t *journal)
542 {
543 ext2_filsys fs = journal->j_dev->k_fs;
544
545 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
546 fs->blocksize-V1_SB_SIZE);
547 mark_buffer_dirty(journal->j_sb_buffer);
548 }
549
550
ext2fs_journal_load(journal_t * journal)551 static errcode_t ext2fs_journal_load(journal_t *journal)
552 {
553 ext2_filsys fs = journal->j_dev->k_fs;
554 journal_superblock_t *jsb;
555 struct buffer_head *jbh = journal->j_sb_buffer;
556
557 ll_rw_block(READ, 1, &jbh);
558 if (jbh->b_err)
559 return jbh->b_err;
560
561 jsb = journal->j_superblock;
562 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
563 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
564 return ext2fs_journal_fix_bad_inode(fs);
565
566 switch (ntohl(jsb->s_header.h_blocktype)) {
567 case JFS_SUPERBLOCK_V1:
568 journal->j_format_version = 1;
569 if (jsb->s_feature_compat ||
570 jsb->s_feature_incompat ||
571 jsb->s_feature_ro_compat ||
572 jsb->s_nr_users)
573 clear_v2_journal_fields(journal);
574 break;
575
576 case JFS_SUPERBLOCK_V2:
577 journal->j_format_version = 2;
578 if (ntohl(jsb->s_nr_users) > 1 &&
579 uuid_is_null(fs->super->s_journal_uuid))
580 clear_v2_journal_fields(journal);
581 if (ntohl(jsb->s_nr_users) > 1)
582 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
583 break;
584
585 /*
586 * These should never appear in a journal super block, so if
587 * they do, the journal is badly corrupted.
588 */
589 case JFS_DESCRIPTOR_BLOCK:
590 case JFS_COMMIT_BLOCK:
591 case JFS_REVOKE_BLOCK:
592 return EXT2_ET_CORRUPT_JOURNAL_SB;
593
594 /* If we don't understand the superblock major type, but there
595 * is a magic number, then it is likely to be a new format we
596 * just don't understand, so leave it alone. */
597 default:
598 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
599 }
600
601 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
602 return EXT2_ET_UNSUPP_FEATURE;
603
604 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
605 return EXT2_ET_RO_UNSUPP_FEATURE;
606
607 /* Checksum v1-3 are mutually exclusive features. */
608 if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
609 return EXT2_ET_CORRUPT_JOURNAL_SB;
610
611 if (journal_has_csum_v2or3(journal) &&
612 jfs_has_feature_checksum(journal))
613 return EXT2_ET_CORRUPT_JOURNAL_SB;
614
615 if (!ext2fs_journal_verify_csum_type(journal, jsb) ||
616 !ext2fs_journal_sb_csum_verify(journal, jsb))
617 return EXT2_ET_CORRUPT_JOURNAL_SB;
618
619 if (journal_has_csum_v2or3(journal))
620 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
621 sizeof(jsb->s_uuid));
622
623 /* We have now checked whether we know enough about the journal
624 * format to be able to proceed safely, so any other checks that
625 * fail we should attempt to recover from. */
626 if (jsb->s_blocksize != htonl(journal->j_blocksize))
627 return EXT2_ET_CORRUPT_JOURNAL_SB;
628
629 if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
630 journal->j_maxlen = ntohl(jsb->s_maxlen);
631 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen)
632 return EXT2_ET_CORRUPT_JOURNAL_SB;
633
634 journal->j_tail_sequence = ntohl(jsb->s_sequence);
635 journal->j_transaction_sequence = journal->j_tail_sequence;
636 journal->j_tail = ntohl(jsb->s_start);
637 journal->j_first = ntohl(jsb->s_first);
638 journal->j_last = ntohl(jsb->s_maxlen);
639
640 return 0;
641 }
642
ext2fs_journal_release(ext2_filsys fs,journal_t * journal,int reset,int drop)643 static void ext2fs_journal_release(ext2_filsys fs, journal_t *journal,
644 int reset, int drop)
645 {
646 journal_superblock_t *jsb;
647
648 if (drop)
649 mark_buffer_clean(journal->j_sb_buffer);
650 else if (fs->flags & EXT2_FLAG_RW) {
651 jsb = journal->j_superblock;
652 jsb->s_sequence = htonl(journal->j_tail_sequence);
653 if (reset)
654 jsb->s_start = 0; /* this marks the journal as empty */
655 ext2fs_journal_sb_csum_set(journal, jsb);
656 mark_buffer_dirty(journal->j_sb_buffer);
657 }
658 brelse(journal->j_sb_buffer);
659
660 if (fs && fs->journal_io) {
661 if (fs->io != fs->journal_io)
662 io_channel_close(fs->journal_io);
663 fs->journal_io = NULL;
664 free(fs->journal_name);
665 fs->journal_name = NULL;
666 }
667
668 #ifndef USE_INODE_IO
669 if (journal->j_inode)
670 ext2fs_free_mem(&journal->j_inode);
671 #endif
672 if (journal->j_fs_dev)
673 ext2fs_free_mem(&journal->j_fs_dev);
674 ext2fs_free_mem(&journal);
675 }
676
677 /*
678 * This function makes sure that the superblock fields regarding the
679 * journal are consistent.
680 */
ext2fs_check_ext3_journal(ext2_filsys fs)681 static errcode_t ext2fs_check_ext3_journal(ext2_filsys fs)
682 {
683 struct ext2_super_block *sb = fs->super;
684 journal_t *journal;
685 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
686 errcode_t retval;
687
688 /* If we don't have any journal features, don't do anything more */
689 if (!ext2fs_has_feature_journal(sb) &&
690 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
691 uuid_is_null(sb->s_journal_uuid))
692 return 0;
693
694 retval = ext2fs_get_journal(fs, &journal);
695 if (retval)
696 return retval;
697
698 retval = ext2fs_journal_load(journal);
699 if (retval)
700 goto err;
701
702 /*
703 * We want to make the flags consistent here. We will not leave with
704 * needs_recovery set but has_journal clear. We can't get in a loop
705 * with -y, -n, or -p, only if a user isn't making up their mind.
706 */
707 if (!ext2fs_has_feature_journal(sb)) {
708 retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
709 goto err;
710 }
711
712 if (ext2fs_has_feature_journal(sb) &&
713 !ext2fs_has_feature_journal_needs_recovery(sb) &&
714 journal->j_superblock->s_start != 0) {
715 retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
716 goto err;
717 }
718
719 /*
720 * If we don't need to do replay the journal, check to see if
721 * the journal's errno is set; if so, we need to mark the file
722 * system as being corrupt and clear the journal's s_errno.
723 */
724 if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
725 journal->j_superblock->s_errno) {
726 fs->super->s_state |= EXT2_ERROR_FS;
727 ext2fs_mark_super_dirty(fs);
728 journal->j_superblock->s_errno = 0;
729 ext2fs_journal_sb_csum_set(journal, journal->j_superblock);
730 mark_buffer_dirty(journal->j_sb_buffer);
731 }
732
733 err:
734 ext2fs_journal_release(fs, journal, 0, retval ? 1 : 0);
735 return retval;
736 }
737
recover_ext3_journal(ext2_filsys fs)738 static errcode_t recover_ext3_journal(ext2_filsys fs)
739 {
740 journal_t *journal;
741 errcode_t retval;
742
743 journal_init_revoke_caches();
744 retval = ext2fs_get_journal(fs, &journal);
745 if (retval)
746 return retval;
747
748 retval = ext2fs_journal_load(journal);
749 if (retval)
750 goto errout;
751
752 retval = journal_init_revoke(journal, 1024);
753 if (retval)
754 goto errout;
755
756 retval = -journal_recover(journal);
757 if (retval)
758 goto errout;
759
760 if (journal->j_failed_commit) {
761 journal->j_superblock->s_errno = -EINVAL;
762 mark_buffer_dirty(journal->j_sb_buffer);
763 }
764
765 errout:
766 journal_destroy_revoke(journal);
767 journal_destroy_revoke_caches();
768 ext2fs_journal_release(fs, journal, 1, 0);
769 return retval;
770 }
771
ext2fs_run_ext3_journal(ext2_filsys * fsp)772 errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
773 {
774 ext2_filsys fs = *fsp;
775 io_manager io_ptr = fs->io->manager;
776 errcode_t retval, recover_retval;
777 io_stats stats = 0;
778 unsigned long long kbytes_written = 0;
779 char *fsname;
780 int fsflags;
781 int fsblocksize;
782
783 if (!(fs->flags & EXT2_FLAG_RW))
784 return EXT2_ET_FILE_RO;
785
786 if (fs->flags & EXT2_FLAG_DIRTY)
787 ext2fs_flush(fs); /* Force out any modifications */
788
789 recover_retval = recover_ext3_journal(fs);
790
791 /*
792 * Reload the filesystem context to get up-to-date data from disk
793 * because journal recovery will change the filesystem under us.
794 */
795 if (fs->super->s_kbytes_written &&
796 fs->io->manager->get_stats)
797 fs->io->manager->get_stats(fs->io, &stats);
798 if (stats && stats->bytes_written)
799 kbytes_written = stats->bytes_written >> 10;
800
801 ext2fs_mmp_stop(fs);
802 fsname = fs->device_name;
803 fs->device_name = NULL;
804 fsflags = fs->flags;
805 fsblocksize = fs->blocksize;
806 ext2fs_free(fs);
807 *fsp = NULL;
808 retval = ext2fs_open(fsname, fsflags, 0, fsblocksize, io_ptr, fsp);
809 ext2fs_free_mem(&fsname);
810 if (retval)
811 return retval;
812
813 fs = *fsp;
814 fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
815 fs->super->s_kbytes_written += kbytes_written;
816
817 /* Set the superblock flags */
818 ext2fs_clear_recover(fs, recover_retval != 0);
819
820 /*
821 * Do one last sanity check, and propagate journal->s_errno to
822 * the EXT2_ERROR_FS flag in the fs superblock if needed.
823 */
824 retval = ext2fs_check_ext3_journal(fs);
825 return retval ? retval : recover_retval;
826 }
827
ext2fs_open_journal(ext2_filsys fs,journal_t ** j)828 errcode_t ext2fs_open_journal(ext2_filsys fs, journal_t **j)
829 {
830 journal_t *journal;
831 errcode_t retval;
832
833 journal_init_revoke_caches();
834 retval = ext2fs_get_journal(fs, &journal);
835 if (retval)
836 return retval;
837
838 retval = ext2fs_journal_load(journal);
839 if (retval)
840 goto errout;
841
842 retval = journal_init_revoke(journal, 1024);
843 if (retval)
844 goto errout;
845
846 if (journal->j_failed_commit) {
847 journal->j_superblock->s_errno = -EINVAL;
848 mark_buffer_dirty(journal->j_sb_buffer);
849 }
850
851 *j = journal;
852 return 0;
853
854 errout:
855 journal_destroy_revoke(journal);
856 journal_destroy_revoke_caches();
857 ext2fs_journal_release(fs, journal, 1, 0);
858 return retval;
859 }
860
ext2fs_close_journal(ext2_filsys fs,journal_t ** j)861 errcode_t ext2fs_close_journal(ext2_filsys fs, journal_t **j)
862 {
863 journal_t *journal = *j;
864
865 journal_destroy_revoke(journal);
866 journal_destroy_revoke_caches();
867 ext2fs_journal_release(fs, journal, 0, 0);
868 *j = NULL;
869
870 return 0;
871 }
872
jbd2_commit_block_csum_set(journal_t * j,struct buffer_head * bh)873 void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh)
874 {
875 struct commit_header *h;
876 __u32 csum;
877
878 if (!journal_has_csum_v2or3(j))
879 return;
880
881 h = (struct commit_header *)(bh->b_data);
882 h->h_chksum_type = 0;
883 h->h_chksum_size = 0;
884 h->h_chksum[0] = 0;
885 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
886 h->h_chksum[0] = ext2fs_cpu_to_be32(csum);
887 }
888
jbd2_revoke_csum_set(journal_t * j,struct buffer_head * bh)889 void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh)
890 {
891 struct journal_revoke_tail *tail;
892 __u32 csum;
893
894 if (!journal_has_csum_v2or3(j))
895 return;
896
897 tail = (struct journal_revoke_tail *)(bh->b_data + j->j_blocksize -
898 sizeof(struct journal_revoke_tail));
899 tail->r_checksum = 0;
900 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
901 tail->r_checksum = ext2fs_cpu_to_be32(csum);
902 }
903
jbd2_descr_block_csum_set(journal_t * j,struct buffer_head * bh)904 void jbd2_descr_block_csum_set(journal_t *j, struct buffer_head *bh)
905 {
906 struct journal_block_tail *tail;
907 __u32 csum;
908
909 if (!journal_has_csum_v2or3(j))
910 return;
911
912 tail = (struct journal_block_tail *)(bh->b_data + j->j_blocksize -
913 sizeof(struct journal_block_tail));
914 tail->t_checksum = 0;
915 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
916 tail->t_checksum = ext2fs_cpu_to_be32(csum);
917 }
918
jbd2_block_tag_csum_set(journal_t * j,journal_block_tag_t * tag,struct buffer_head * bh,__u32 sequence)919 void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
920 struct buffer_head *bh, __u32 sequence)
921 {
922 journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag;
923 __u32 csum32;
924 __be32 seq;
925
926 if (!journal_has_csum_v2or3(j))
927 return;
928
929 seq = ext2fs_cpu_to_be32(sequence);
930 csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
931 csum32 = jbd2_chksum(j, csum32, bh->b_data, bh->b_size);
932
933 if (jfs_has_feature_csum3(j))
934 tag3->t_checksum = ext2fs_cpu_to_be32(csum32);
935 else
936 tag->t_checksum = ext2fs_cpu_to_be16(csum32);
937 }
938
939