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 ext2fs_mark_super_dirty(fs);
254 }
255
256 /*
257 * This is a helper function to check the validity of the journal.
258 */
259 struct process_block_struct {
260 e2_blkcnt_t last_block;
261 };
262
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)263 static int process_journal_block(ext2_filsys fs,
264 blk64_t *block_nr,
265 e2_blkcnt_t blockcnt,
266 blk64_t ref_block EXT2FS_ATTR((unused)),
267 int ref_offset EXT2FS_ATTR((unused)),
268 void *priv_data)
269 {
270 struct process_block_struct *p;
271 blk64_t blk = *block_nr;
272
273 p = (struct process_block_struct *) priv_data;
274
275 if (!blk || blk < fs->super->s_first_data_block ||
276 blk >= ext2fs_blocks_count(fs->super))
277 return BLOCK_ABORT;
278
279 if (blockcnt >= 0)
280 p->last_block = blockcnt;
281 return 0;
282 }
283
ext2fs_get_journal(ext2_filsys fs,journal_t ** ret_journal)284 static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal)
285 {
286 struct process_block_struct pb;
287 struct ext2_super_block *sb = fs->super;
288 struct ext2_super_block jsuper;
289 struct buffer_head *bh;
290 struct inode *j_inode = NULL;
291 struct kdev_s *dev_fs = NULL, *dev_journal;
292 const char *journal_name = 0;
293 journal_t *journal = NULL;
294 errcode_t retval = 0;
295 io_manager io_ptr = 0;
296 unsigned long long start = 0;
297 int ext_journal = 0;
298 int tried_backup_jnl = 0;
299
300 retval = ext2fs_get_memzero(sizeof(journal_t), &journal);
301 if (retval)
302 return retval;
303
304 retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs);
305 if (retval)
306 goto errout;
307 dev_journal = dev_fs+1;
308
309 dev_fs->k_fs = dev_journal->k_fs = fs;
310 dev_fs->k_dev = K_DEV_FS;
311 dev_journal->k_dev = K_DEV_JOURNAL;
312
313 journal->j_dev = dev_journal;
314 journal->j_fs_dev = dev_fs;
315 journal->j_inode = NULL;
316 journal->j_blocksize = fs->blocksize;
317
318 if (uuid_is_null(sb->s_journal_uuid)) {
319 if (!sb->s_journal_inum) {
320 retval = EXT2_ET_BAD_INODE_NUM;
321 goto errout;
322 }
323 retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode);
324 if (retval)
325 goto errout;
326
327 j_inode->i_fs = fs;
328 j_inode->i_ino = sb->s_journal_inum;
329
330 retval = ext2fs_read_inode(fs, sb->s_journal_inum,
331 &j_inode->i_ext2);
332 if (retval) {
333 try_backup_journal:
334 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
335 tried_backup_jnl)
336 goto errout;
337 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
338 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
339 EXT2_N_BLOCKS*4);
340 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
341 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
342 j_inode->i_ext2.i_links_count = 1;
343 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
344 tried_backup_jnl++;
345 }
346 if (!j_inode->i_ext2.i_links_count ||
347 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
348 retval = EXT2_ET_NO_JOURNAL;
349 goto try_backup_journal;
350 }
351 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
352 JFS_MIN_JOURNAL_BLOCKS) {
353 retval = EXT2_ET_JOURNAL_TOO_SMALL;
354 goto try_backup_journal;
355 }
356 pb.last_block = -1;
357 retval = ext2fs_block_iterate3(fs, j_inode->i_ino,
358 BLOCK_FLAG_HOLE, 0,
359 process_journal_block, &pb);
360 if ((pb.last_block + 1) * fs->blocksize <
361 (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
362 retval = EXT2_ET_JOURNAL_TOO_SMALL;
363 goto try_backup_journal;
364 }
365 if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) {
366 retval = ext2fs_write_inode(fs, sb->s_journal_inum,
367 &j_inode->i_ext2);
368 if (retval)
369 goto errout;
370 }
371
372 journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) /
373 journal->j_blocksize;
374
375 #ifdef USE_INODE_IO
376 retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum,
377 &j_inode->i_ext2,
378 &journal_name);
379 if (retval)
380 goto errout;
381
382 io_ptr = inode_io_manager;
383 #else
384 journal->j_inode = j_inode;
385 fs->journal_io = fs->io;
386 retval = (errcode_t)journal_bmap(journal, 0, &start);
387 if (retval)
388 goto errout;
389 #endif
390 } else {
391 ext_journal = 1;
392 if (!fs->journal_name) {
393 char uuid[37];
394 blkid_cache blkid;
395
396 blkid_get_cache(&blkid, NULL);
397 uuid_unparse(sb->s_journal_uuid, uuid);
398 fs->journal_name = blkid_get_devname(blkid,
399 "UUID", uuid);
400 if (!fs->journal_name)
401 fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
402 blkid_put_cache(blkid);
403 }
404 journal_name = fs->journal_name;
405
406 if (!journal_name) {
407 retval = EXT2_ET_LOAD_EXT_JOURNAL;
408 goto errout;
409 }
410
411 jfs_debug(1, "Using journal file %s\n", journal_name);
412 io_ptr = unix_io_manager;
413 }
414
415 #if 0
416 test_io_backing_manager = io_ptr;
417 io_ptr = test_io_manager;
418 #endif
419 #ifndef USE_INODE_IO
420 if (ext_journal)
421 #endif
422 {
423 retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW,
424 &fs->journal_io);
425 }
426 if (retval)
427 goto errout;
428
429 io_channel_set_blksize(fs->journal_io, fs->blocksize);
430
431 if (ext_journal) {
432 blk64_t maxlen;
433
434 start = ext2fs_journal_sb_start(fs->blocksize) - 1;
435 bh = getblk(dev_journal, start, fs->blocksize);
436 if (!bh) {
437 retval = EXT2_ET_NO_MEMORY;
438 goto errout;
439 }
440 ll_rw_block(READ, 1, &bh);
441 retval = bh->b_err;
442 if (retval) {
443 brelse(bh);
444 goto errout;
445 }
446 memcpy(&jsuper, start ? bh->b_data :
447 bh->b_data + SUPERBLOCK_OFFSET,
448 sizeof(jsuper));
449 #ifdef WORDS_BIGENDIAN
450 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
451 ext2fs_swap_super(&jsuper);
452 #endif
453 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
454 !ext2fs_has_feature_journal_dev(&jsuper)) {
455 retval = EXT2_ET_LOAD_EXT_JOURNAL;
456 brelse(bh);
457 goto errout;
458 }
459 /* Make sure the journal UUID is correct */
460 if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid,
461 sizeof(jsuper.s_uuid))) {
462 retval = EXT2_ET_LOAD_EXT_JOURNAL;
463 brelse(bh);
464 goto errout;
465 }
466
467 /* Check the superblock checksum */
468 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
469 struct struct_ext2_filsys fsx;
470 struct ext2_super_block superx;
471 void *p;
472
473 p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
474 memcpy(&fsx, fs, sizeof(fsx));
475 memcpy(&superx, fs->super, sizeof(superx));
476 fsx.super = &superx;
477 ext2fs_set_feature_metadata_csum(fsx.super);
478 if (!ext2fs_superblock_csum_verify(&fsx, p)) {
479 retval = EXT2_ET_LOAD_EXT_JOURNAL;
480 brelse(bh);
481 goto errout;
482 }
483 }
484 brelse(bh);
485
486 maxlen = ext2fs_blocks_count(&jsuper);
487 journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen :
488 (1ULL << 32) - 1;
489 start++;
490 }
491
492 bh = getblk(dev_journal, start, journal->j_blocksize);
493 if (!bh) {
494 retval = EXT2_ET_NO_MEMORY;
495 goto errout;
496 }
497
498 journal->j_sb_buffer = bh;
499 journal->j_superblock = (journal_superblock_t *)bh->b_data;
500
501 #ifdef USE_INODE_IO
502 if (j_inode)
503 ext2fs_free_mem(&j_inode);
504 #endif
505
506 *ret_journal = journal;
507 return 0;
508
509 errout:
510 if (dev_fs)
511 ext2fs_free_mem(&dev_fs);
512 if (j_inode)
513 ext2fs_free_mem(&j_inode);
514 if (journal)
515 ext2fs_free_mem(&journal);
516 return retval;
517 }
518
ext2fs_journal_fix_bad_inode(ext2_filsys fs)519 static errcode_t ext2fs_journal_fix_bad_inode(ext2_filsys fs)
520 {
521 struct ext2_super_block *sb = fs->super;
522 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
523 int has_journal = ext2fs_has_feature_journal(fs->super);
524
525 if (has_journal || sb->s_journal_inum) {
526 /* The journal inode is bogus, remove and force full fsck */
527 return EXT2_ET_BAD_INODE_NUM;
528 } else if (recover) {
529 return EXT2_ET_UNSUPP_FEATURE;
530 }
531 return 0;
532 }
533
534 #define V1_SB_SIZE 0x0024
clear_v2_journal_fields(journal_t * journal)535 static void clear_v2_journal_fields(journal_t *journal)
536 {
537 ext2_filsys fs = journal->j_dev->k_fs;
538
539 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
540 fs->blocksize-V1_SB_SIZE);
541 mark_buffer_dirty(journal->j_sb_buffer);
542 }
543
544
ext2fs_journal_load(journal_t * journal)545 static errcode_t ext2fs_journal_load(journal_t *journal)
546 {
547 ext2_filsys fs = journal->j_dev->k_fs;
548 journal_superblock_t *jsb;
549 struct buffer_head *jbh = journal->j_sb_buffer;
550
551 ll_rw_block(READ, 1, &jbh);
552 if (jbh->b_err)
553 return jbh->b_err;
554
555 jsb = journal->j_superblock;
556 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
557 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
558 return ext2fs_journal_fix_bad_inode(fs);
559
560 switch (ntohl(jsb->s_header.h_blocktype)) {
561 case JFS_SUPERBLOCK_V1:
562 journal->j_format_version = 1;
563 if (jsb->s_feature_compat ||
564 jsb->s_feature_incompat ||
565 jsb->s_feature_ro_compat ||
566 jsb->s_nr_users)
567 clear_v2_journal_fields(journal);
568 break;
569
570 case JFS_SUPERBLOCK_V2:
571 journal->j_format_version = 2;
572 if (ntohl(jsb->s_nr_users) > 1 &&
573 uuid_is_null(fs->super->s_journal_uuid))
574 clear_v2_journal_fields(journal);
575 if (ntohl(jsb->s_nr_users) > 1)
576 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
577 break;
578
579 /*
580 * These should never appear in a journal super block, so if
581 * they do, the journal is badly corrupted.
582 */
583 case JFS_DESCRIPTOR_BLOCK:
584 case JFS_COMMIT_BLOCK:
585 case JFS_REVOKE_BLOCK:
586 return EXT2_ET_CORRUPT_JOURNAL_SB;
587
588 /* If we don't understand the superblock major type, but there
589 * is a magic number, then it is likely to be a new format we
590 * just don't understand, so leave it alone. */
591 default:
592 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
593 }
594
595 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
596 return EXT2_ET_UNSUPP_FEATURE;
597
598 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
599 return EXT2_ET_RO_UNSUPP_FEATURE;
600
601 /* Checksum v1-3 are mutually exclusive features. */
602 if (jfs_has_feature_csum2(journal) && jfs_has_feature_csum3(journal))
603 return EXT2_ET_CORRUPT_JOURNAL_SB;
604
605 if (journal_has_csum_v2or3(journal) &&
606 jfs_has_feature_checksum(journal))
607 return EXT2_ET_CORRUPT_JOURNAL_SB;
608
609 if (!ext2fs_journal_verify_csum_type(journal, jsb) ||
610 !ext2fs_journal_sb_csum_verify(journal, jsb))
611 return EXT2_ET_CORRUPT_JOURNAL_SB;
612
613 if (journal_has_csum_v2or3(journal))
614 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
615 sizeof(jsb->s_uuid));
616
617 /* We have now checked whether we know enough about the journal
618 * format to be able to proceed safely, so any other checks that
619 * fail we should attempt to recover from. */
620 if (jsb->s_blocksize != htonl(journal->j_blocksize))
621 return EXT2_ET_CORRUPT_JOURNAL_SB;
622
623 if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
624 journal->j_maxlen = ntohl(jsb->s_maxlen);
625 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen)
626 return EXT2_ET_CORRUPT_JOURNAL_SB;
627
628 journal->j_tail_sequence = ntohl(jsb->s_sequence);
629 journal->j_transaction_sequence = journal->j_tail_sequence;
630 journal->j_tail = ntohl(jsb->s_start);
631 journal->j_first = ntohl(jsb->s_first);
632 journal->j_last = ntohl(jsb->s_maxlen);
633
634 return 0;
635 }
636
ext2fs_journal_release(ext2_filsys fs,journal_t * journal,int reset,int drop)637 static void ext2fs_journal_release(ext2_filsys fs, journal_t *journal,
638 int reset, int drop)
639 {
640 journal_superblock_t *jsb;
641
642 if (drop)
643 mark_buffer_clean(journal->j_sb_buffer);
644 else if (fs->flags & EXT2_FLAG_RW) {
645 jsb = journal->j_superblock;
646 jsb->s_sequence = htonl(journal->j_tail_sequence);
647 if (reset)
648 jsb->s_start = 0; /* this marks the journal as empty */
649 ext2fs_journal_sb_csum_set(journal, jsb);
650 mark_buffer_dirty(journal->j_sb_buffer);
651 }
652 brelse(journal->j_sb_buffer);
653
654 if (fs && fs->journal_io) {
655 if (fs->io != fs->journal_io)
656 io_channel_close(fs->journal_io);
657 fs->journal_io = NULL;
658 }
659
660 #ifndef USE_INODE_IO
661 if (journal->j_inode)
662 ext2fs_free_mem(&journal->j_inode);
663 #endif
664 if (journal->j_fs_dev)
665 ext2fs_free_mem(&journal->j_fs_dev);
666 ext2fs_free_mem(&journal);
667 }
668
669 /*
670 * This function makes sure that the superblock fields regarding the
671 * journal are consistent.
672 */
ext2fs_check_ext3_journal(ext2_filsys fs)673 static errcode_t ext2fs_check_ext3_journal(ext2_filsys fs)
674 {
675 struct ext2_super_block *sb = fs->super;
676 journal_t *journal;
677 int recover = ext2fs_has_feature_journal_needs_recovery(fs->super);
678 errcode_t retval;
679
680 /* If we don't have any journal features, don't do anything more */
681 if (!ext2fs_has_feature_journal(sb) &&
682 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
683 uuid_is_null(sb->s_journal_uuid))
684 return 0;
685
686 retval = ext2fs_get_journal(fs, &journal);
687 if (retval)
688 return retval;
689
690 retval = ext2fs_journal_load(journal);
691 if (retval)
692 goto err;
693
694 /*
695 * We want to make the flags consistent here. We will not leave with
696 * needs_recovery set but has_journal clear. We can't get in a loop
697 * with -y, -n, or -p, only if a user isn't making up their mind.
698 */
699 if (!ext2fs_has_feature_journal(sb)) {
700 retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
701 goto err;
702 }
703
704 if (ext2fs_has_feature_journal(sb) &&
705 !ext2fs_has_feature_journal_needs_recovery(sb) &&
706 journal->j_superblock->s_start != 0) {
707 retval = EXT2_ET_JOURNAL_FLAGS_WRONG;
708 goto err;
709 }
710
711 /*
712 * If we don't need to do replay the journal, check to see if
713 * the journal's errno is set; if so, we need to mark the file
714 * system as being corrupt and clear the journal's s_errno.
715 */
716 if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
717 journal->j_superblock->s_errno) {
718 fs->super->s_state |= EXT2_ERROR_FS;
719 ext2fs_mark_super_dirty(fs);
720 journal->j_superblock->s_errno = 0;
721 ext2fs_journal_sb_csum_set(journal, journal->j_superblock);
722 mark_buffer_dirty(journal->j_sb_buffer);
723 }
724
725 err:
726 ext2fs_journal_release(fs, journal, 0, retval ? 1 : 0);
727 return retval;
728 }
729
recover_ext3_journal(ext2_filsys fs)730 static errcode_t recover_ext3_journal(ext2_filsys fs)
731 {
732 journal_t *journal;
733 errcode_t retval;
734
735 journal_init_revoke_caches();
736 retval = ext2fs_get_journal(fs, &journal);
737 if (retval)
738 return retval;
739
740 retval = ext2fs_journal_load(journal);
741 if (retval)
742 goto errout;
743
744 retval = journal_init_revoke(journal, 1024);
745 if (retval)
746 goto errout;
747
748 retval = -journal_recover(journal);
749 if (retval)
750 goto errout;
751
752 if (journal->j_failed_commit) {
753 journal->j_superblock->s_errno = -EINVAL;
754 mark_buffer_dirty(journal->j_sb_buffer);
755 }
756
757 errout:
758 journal_destroy_revoke(journal);
759 journal_destroy_revoke_caches();
760 ext2fs_journal_release(fs, journal, 1, 0);
761 return retval;
762 }
763
ext2fs_run_ext3_journal(ext2_filsys * fsp)764 errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
765 {
766 ext2_filsys fs = *fsp;
767 io_manager io_ptr = fs->io->manager;
768 errcode_t retval, recover_retval;
769 io_stats stats = 0;
770 unsigned long long kbytes_written = 0;
771 char *fsname;
772 int fsflags;
773 int fsblocksize;
774
775 if (!(fs->flags & EXT2_FLAG_RW))
776 return EXT2_ET_FILE_RO;
777
778 if (fs->flags & EXT2_FLAG_DIRTY)
779 ext2fs_flush(fs); /* Force out any modifications */
780
781 recover_retval = recover_ext3_journal(fs);
782
783 /*
784 * Reload the filesystem context to get up-to-date data from disk
785 * because journal recovery will change the filesystem under us.
786 */
787 if (fs->super->s_kbytes_written &&
788 fs->io->manager->get_stats)
789 fs->io->manager->get_stats(fs->io, &stats);
790 if (stats && stats->bytes_written)
791 kbytes_written = stats->bytes_written >> 10;
792
793 ext2fs_mmp_stop(fs);
794 fsname = strdup(fs->device_name);
795 fsflags = fs->flags;
796 fsblocksize = fs->blocksize;
797 ext2fs_free(fs);
798 retval = ext2fs_open(fsname, fsflags,
799 0, fsblocksize, io_ptr,
800 fsp);
801 free(fsname);
802 if (retval)
803 return retval;
804
805 fs = *fsp;
806 fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
807 fs->super->s_kbytes_written += kbytes_written;
808
809 /* Set the superblock flags */
810 ext2fs_clear_recover(fs, recover_retval != 0);
811
812 /*
813 * Do one last sanity check, and propagate journal->s_errno to
814 * the EXT2_ERROR_FS flag in the fs superblock if needed.
815 */
816 retval = ext2fs_check_ext3_journal(fs);
817 return retval ? retval : recover_retval;
818 }
819
ext2fs_open_journal(ext2_filsys fs,journal_t ** j)820 errcode_t ext2fs_open_journal(ext2_filsys fs, journal_t **j)
821 {
822 journal_t *journal;
823 errcode_t retval;
824
825 journal_init_revoke_caches();
826 retval = ext2fs_get_journal(fs, &journal);
827 if (retval)
828 return retval;
829
830 retval = ext2fs_journal_load(journal);
831 if (retval)
832 goto errout;
833
834 retval = journal_init_revoke(journal, 1024);
835 if (retval)
836 goto errout;
837
838 if (journal->j_failed_commit) {
839 journal->j_superblock->s_errno = -EINVAL;
840 mark_buffer_dirty(journal->j_sb_buffer);
841 }
842
843 *j = journal;
844 return 0;
845
846 errout:
847 journal_destroy_revoke(journal);
848 journal_destroy_revoke_caches();
849 ext2fs_journal_release(fs, journal, 1, 0);
850 return retval;
851 }
852
ext2fs_close_journal(ext2_filsys fs,journal_t ** j)853 errcode_t ext2fs_close_journal(ext2_filsys fs, journal_t **j)
854 {
855 journal_t *journal = *j;
856
857 journal_destroy_revoke(journal);
858 journal_destroy_revoke_caches();
859 ext2fs_journal_release(fs, journal, 0, 0);
860 *j = NULL;
861
862 return 0;
863 }
864
jbd2_commit_block_csum_set(journal_t * j,struct buffer_head * bh)865 void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh)
866 {
867 struct commit_header *h;
868 __u32 csum;
869
870 if (!journal_has_csum_v2or3(j))
871 return;
872
873 h = (struct commit_header *)(bh->b_data);
874 h->h_chksum_type = 0;
875 h->h_chksum_size = 0;
876 h->h_chksum[0] = 0;
877 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
878 h->h_chksum[0] = ext2fs_cpu_to_be32(csum);
879 }
880
jbd2_revoke_csum_set(journal_t * j,struct buffer_head * bh)881 void jbd2_revoke_csum_set(journal_t *j, struct buffer_head *bh)
882 {
883 struct journal_revoke_tail *tail;
884 __u32 csum;
885
886 if (!journal_has_csum_v2or3(j))
887 return;
888
889 tail = (struct journal_revoke_tail *)(bh->b_data + j->j_blocksize -
890 sizeof(struct journal_revoke_tail));
891 tail->r_checksum = 0;
892 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
893 tail->r_checksum = ext2fs_cpu_to_be32(csum);
894 }
895
jbd2_descr_block_csum_set(journal_t * j,struct buffer_head * bh)896 void jbd2_descr_block_csum_set(journal_t *j, struct buffer_head *bh)
897 {
898 struct journal_block_tail *tail;
899 __u32 csum;
900
901 if (!journal_has_csum_v2or3(j))
902 return;
903
904 tail = (struct journal_block_tail *)(bh->b_data + j->j_blocksize -
905 sizeof(struct journal_block_tail));
906 tail->t_checksum = 0;
907 csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
908 tail->t_checksum = ext2fs_cpu_to_be32(csum);
909 }
910
jbd2_block_tag_csum_set(journal_t * j,journal_block_tag_t * tag,struct buffer_head * bh,__u32 sequence)911 void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
912 struct buffer_head *bh, __u32 sequence)
913 {
914 journal_block_tag3_t *tag3 = (journal_block_tag3_t *)tag;
915 __u32 csum32;
916 __be32 seq;
917
918 if (!journal_has_csum_v2or3(j))
919 return;
920
921 seq = ext2fs_cpu_to_be32(sequence);
922 csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
923 csum32 = jbd2_chksum(j, csum32, bh->b_data, bh->b_size);
924
925 if (jfs_has_feature_csum3(j))
926 tag3->t_checksum = ext2fs_cpu_to_be32(csum32);
927 else
928 tag->t_checksum = ext2fs_cpu_to_be16(csum32);
929 }
930
931