aboutsummaryrefslogtreecommitdiff
path: root/e2fsprogs/e2fsck/journal.c
diff options
context:
space:
mode:
Diffstat (limited to 'e2fsprogs/e2fsck/journal.c')
-rw-r--r--e2fsprogs/e2fsck/journal.c960
1 files changed, 960 insertions, 0 deletions
diff --git a/e2fsprogs/e2fsck/journal.c b/e2fsprogs/e2fsck/journal.c
new file mode 100644
index 000000000..14e774d50
--- /dev/null
+++ b/e2fsprogs/e2fsck/journal.c
@@ -0,0 +1,960 @@
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#ifdef HAVE_SYS_MOUNT_H
16#include <sys/param.h>
17#include <sys/mount.h>
18#define MNT_FL (MS_MGC_VAL | MS_RDONLY)
19#endif
20#ifdef HAVE_SYS_STAT_H
21#include <sys/stat.h>
22#endif
23
24#define E2FSCK_INCLUDE_INLINE_FUNCS
25#include "jfs_user.h"
26#include "problem.h"
27#include "uuid/uuid.h"
28
29#ifdef __CONFIG_JBD_DEBUG__E2FS /* Enabled by configure --enable-jfs-debug */
30static int bh_count = 0;
31#endif
32
33/*
34 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
35 * This creates a larger static binary, and a smaller binary using
36 * shared libraries. It's also probably slightly less CPU-efficient,
37 * which is why it's not on by default. But, it's a good way of
38 * testing the functions in inode_io.c and fileio.c.
39 */
40#undef USE_INODE_IO
41
42/* Kernel compatibility functions for handling the journal. These allow us
43 * to use the recovery.c file virtually unchanged from the kernel, so we
44 * don't have to do much to keep kernel and user recovery in sync.
45 */
46int journal_bmap(journal_t *journal, blk_t block, unsigned long *phys)
47{
48#ifdef USE_INODE_IO
49 *phys = block;
50 return 0;
51#else
52 struct inode *inode = journal->j_inode;
53 errcode_t retval;
54 blk_t pblk;
55
56 if (!inode) {
57 *phys = block;
58 return 0;
59 }
60
61 retval= ext2fs_bmap(inode->i_ctx->fs, inode->i_ino,
62 &inode->i_ext2, NULL, 0, block, &pblk);
63 *phys = pblk;
64 return (retval);
65#endif
66}
67
68struct buffer_head *getblk(kdev_t kdev, blk_t blocknr, int blocksize)
69{
70 struct buffer_head *bh;
71
72 bh = e2fsck_allocate_memory(kdev->k_ctx, sizeof(*bh), "block buffer");
73 if (!bh)
74 return NULL;
75
76 jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
77 (unsigned long) blocknr, blocksize, ++bh_count);
78
79 bh->b_ctx = kdev->k_ctx;
80 if (kdev->k_dev == K_DEV_FS)
81 bh->b_io = kdev->k_ctx->fs->io;
82 else
83 bh->b_io = kdev->k_ctx->journal_io;
84 bh->b_size = blocksize;
85 bh->b_blocknr = blocknr;
86
87 return bh;
88}
89
90void sync_blockdev(kdev_t kdev)
91{
92 io_channel io;
93
94 if (kdev->k_dev == K_DEV_FS)
95 io = kdev->k_ctx->fs->io;
96 else
97 io = kdev->k_ctx->journal_io;
98
99 io_channel_flush(io);
100}
101
102void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
103{
104 int retval;
105 struct buffer_head *bh;
106
107 for (; nr > 0; --nr) {
108 bh = *bhp++;
109 if (rw == READ && !bh->b_uptodate) {
110 jfs_debug(3, "reading block %lu/%p\n",
111 (unsigned long) bh->b_blocknr, (void *) bh);
112 retval = io_channel_read_blk(bh->b_io,
113 bh->b_blocknr,
114 1, bh->b_data);
115 if (retval) {
116 com_err(bh->b_ctx->device_name, retval,
117 "while reading block %lu\n",
118 (unsigned long) bh->b_blocknr);
119 bh->b_err = retval;
120 continue;
121 }
122 bh->b_uptodate = 1;
123 } else if (rw == WRITE && bh->b_dirty) {
124 jfs_debug(3, "writing block %lu/%p\n",
125 (unsigned long) bh->b_blocknr, (void *) bh);
126 retval = io_channel_write_blk(bh->b_io,
127 bh->b_blocknr,
128 1, bh->b_data);
129 if (retval) {
130 com_err(bh->b_ctx->device_name, retval,
131 "while writing block %lu\n",
132 (unsigned long) bh->b_blocknr);
133 bh->b_err = retval;
134 continue;
135 }
136 bh->b_dirty = 0;
137 bh->b_uptodate = 1;
138 } else {
139 jfs_debug(3, "no-op %s for block %lu\n",
140 rw == READ ? "read" : "write",
141 (unsigned long) bh->b_blocknr);
142 }
143 }
144}
145
146void mark_buffer_dirty(struct buffer_head *bh)
147{
148 bh->b_dirty = 1;
149}
150
151static void mark_buffer_clean(struct buffer_head * bh)
152{
153 bh->b_dirty = 0;
154}
155
156void brelse(struct buffer_head *bh)
157{
158 if (bh->b_dirty)
159 ll_rw_block(WRITE, 1, &bh);
160 jfs_debug(3, "freeing block %lu/%p (total %d)\n",
161 (unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
162 ext2fs_free_mem(&bh);
163}
164
165int buffer_uptodate(struct buffer_head *bh)
166{
167 return bh->b_uptodate;
168}
169
170void mark_buffer_uptodate(struct buffer_head *bh, int val)
171{
172 bh->b_uptodate = val;
173}
174
175void wait_on_buffer(struct buffer_head *bh)
176{
177 if (!bh->b_uptodate)
178 ll_rw_block(READ, 1, &bh);
179}
180
181
182static void e2fsck_clear_recover(e2fsck_t ctx, int error)
183{
184 ctx->fs->super->s_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
185
186 /* if we had an error doing journal recovery, we need a full fsck */
187 if (error)
188 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
189 ext2fs_mark_super_dirty(ctx->fs);
190}
191
192static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
193{
194 struct ext2_super_block *sb = ctx->fs->super;
195 struct ext2_super_block jsuper;
196 struct problem_context pctx;
197 struct buffer_head *bh;
198 struct inode *j_inode = NULL;
199 struct kdev_s *dev_fs = NULL, *dev_journal;
200 const char *journal_name = 0;
201 journal_t *journal = NULL;
202 errcode_t retval = 0;
203 io_manager io_ptr = 0;
204 unsigned long start = 0;
205 blk_t blk;
206 int ext_journal = 0;
207 int tried_backup_jnl = 0;
208 int i;
209
210 clear_problem_context(&pctx);
211
212 journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
213 if (!journal) {
214 return EXT2_ET_NO_MEMORY;
215 }
216
217 dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
218 if (!dev_fs) {
219 retval = EXT2_ET_NO_MEMORY;
220 goto errout;
221 }
222 dev_journal = dev_fs+1;
223
224 dev_fs->k_ctx = dev_journal->k_ctx = ctx;
225 dev_fs->k_dev = K_DEV_FS;
226 dev_journal->k_dev = K_DEV_JOURNAL;
227
228 journal->j_dev = dev_journal;
229 journal->j_fs_dev = dev_fs;
230 journal->j_inode = NULL;
231 journal->j_blocksize = ctx->fs->blocksize;
232
233 if (uuid_is_null(sb->s_journal_uuid)) {
234 if (!sb->s_journal_inum)
235 return EXT2_ET_BAD_INODE_NUM;
236 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
237 "journal inode");
238 if (!j_inode) {
239 retval = EXT2_ET_NO_MEMORY;
240 goto errout;
241 }
242
243 j_inode->i_ctx = ctx;
244 j_inode->i_ino = sb->s_journal_inum;
245
246 if ((retval = ext2fs_read_inode(ctx->fs,
247 sb->s_journal_inum,
248 &j_inode->i_ext2))) {
249 try_backup_journal:
250 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
251 tried_backup_jnl)
252 goto errout;
253 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
254 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
255 EXT2_N_BLOCKS*4);
256 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
257 j_inode->i_ext2.i_links_count = 1;
258 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
259 tried_backup_jnl++;
260 }
261 if (!j_inode->i_ext2.i_links_count ||
262 !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) {
263 retval = EXT2_ET_NO_JOURNAL;
264 goto try_backup_journal;
265 }
266 if (j_inode->i_ext2.i_size / journal->j_blocksize <
267 JFS_MIN_JOURNAL_BLOCKS) {
268 retval = EXT2_ET_JOURNAL_TOO_SMALL;
269 goto try_backup_journal;
270 }
271 for (i=0; i < EXT2_N_BLOCKS; i++) {
272 blk = j_inode->i_ext2.i_block[i];
273 if (!blk) {
274 if (i < EXT2_NDIR_BLOCKS) {
275 retval = EXT2_ET_JOURNAL_TOO_SMALL;
276 goto try_backup_journal;
277 }
278 continue;
279 }
280 if (blk < sb->s_first_data_block ||
281 blk >= sb->s_blocks_count) {
282 retval = EXT2_ET_BAD_BLOCK_NUM;
283 goto try_backup_journal;
284 }
285 }
286 journal->j_maxlen = j_inode->i_ext2.i_size / journal->j_blocksize;
287
288#ifdef USE_INODE_IO
289 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
290 &j_inode->i_ext2,
291 &journal_name);
292 if (retval)
293 goto errout;
294
295 io_ptr = inode_io_manager;
296#else
297 journal->j_inode = j_inode;
298 ctx->journal_io = ctx->fs->io;
299 if ((retval = journal_bmap(journal, 0, &start)) != 0)
300 goto errout;
301#endif
302 } else {
303 ext_journal = 1;
304 if (!ctx->journal_name) {
305 char uuid[37];
306
307 uuid_unparse(sb->s_journal_uuid, uuid);
308 ctx->journal_name = blkid_get_devname(ctx->blkid,
309 "UUID", uuid);
310 if (!ctx->journal_name)
311 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
312 }
313 journal_name = ctx->journal_name;
314
315 if (!journal_name) {
316 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
317 return EXT2_ET_LOAD_EXT_JOURNAL;
318 }
319
320 jfs_debug(1, "Using journal file %s\n", journal_name);
321 io_ptr = unix_io_manager;
322 }
323
324#if 0
325 test_io_backing_manager = io_ptr;
326 io_ptr = test_io_manager;
327#endif
328#ifndef USE_INODE_IO
329 if (ext_journal)
330#endif
331 retval = io_ptr->open(journal_name, IO_FLAG_RW,
332 &ctx->journal_io);
333 if (retval)
334 goto errout;
335
336 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
337
338 if (ext_journal) {
339 if (ctx->fs->blocksize == 1024)
340 start = 1;
341 bh = getblk(dev_journal, start, ctx->fs->blocksize);
342 if (!bh) {
343 retval = EXT2_ET_NO_MEMORY;
344 goto errout;
345 }
346 ll_rw_block(READ, 1, &bh);
347 if ((retval = bh->b_err) != 0)
348 goto errout;
349 memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024,
350 sizeof(jsuper));
351 brelse(bh);
352#ifdef EXT2FS_ENABLE_SWAPFS
353 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
354 ext2fs_swap_super(&jsuper);
355#endif
356 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
357 !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
358 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
359 retval = EXT2_ET_LOAD_EXT_JOURNAL;
360 goto errout;
361 }
362 /* Make sure the journal UUID is correct */
363 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
364 sizeof(jsuper.s_uuid))) {
365 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
366 retval = EXT2_ET_LOAD_EXT_JOURNAL;
367 goto errout;
368 }
369
370 journal->j_maxlen = jsuper.s_blocks_count;
371 start++;
372 }
373
374 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
375 retval = EXT2_ET_NO_MEMORY;
376 goto errout;
377 }
378
379 journal->j_sb_buffer = bh;
380 journal->j_superblock = (journal_superblock_t *)bh->b_data;
381
382#ifdef USE_INODE_IO
383 if (j_inode)
384 ext2fs_free_mem(&j_inode);
385#endif
386
387 *ret_journal = journal;
388 return 0;
389
390errout:
391 if (dev_fs)
392 ext2fs_free_mem(&dev_fs);
393 if (j_inode)
394 ext2fs_free_mem(&j_inode);
395 if (journal)
396 ext2fs_free_mem(&journal);
397 return retval;
398
399}
400
401static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
402 struct problem_context *pctx)
403{
404 struct ext2_super_block *sb = ctx->fs->super;
405 int recover = ctx->fs->super->s_feature_incompat &
406 EXT3_FEATURE_INCOMPAT_RECOVER;
407 int has_journal = ctx->fs->super->s_feature_compat &
408 EXT3_FEATURE_COMPAT_HAS_JOURNAL;
409
410 if (has_journal || sb->s_journal_inum) {
411 /* The journal inode is bogus, remove and force full fsck */
412 pctx->ino = sb->s_journal_inum;
413 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
414 if (has_journal && sb->s_journal_inum)
415 printf("*** ext3 journal has been deleted - "
416 "filesystem is now ext2 only ***\n\n");
417 sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
418 sb->s_journal_inum = 0;
419 ctx->flags |= E2F_FLAG_JOURNAL_INODE; /* FIXME: todo */
420 e2fsck_clear_recover(ctx, 1);
421 return 0;
422 }
423 return EXT2_ET_BAD_INODE_NUM;
424 } else if (recover) {
425 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
426 e2fsck_clear_recover(ctx, 1);
427 return 0;
428 }
429 return EXT2_ET_UNSUPP_FEATURE;
430 }
431 return 0;
432}
433
434#define V1_SB_SIZE 0x0024
435static void clear_v2_journal_fields(journal_t *journal)
436{
437 e2fsck_t ctx = journal->j_dev->k_ctx;
438 struct problem_context pctx;
439
440 clear_problem_context(&pctx);
441
442 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
443 return;
444
445 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
446 ctx->fs->blocksize-V1_SB_SIZE);
447 mark_buffer_dirty(journal->j_sb_buffer);
448}
449
450
451static errcode_t e2fsck_journal_load(journal_t *journal)
452{
453 e2fsck_t ctx = journal->j_dev->k_ctx;
454 journal_superblock_t *jsb;
455 struct buffer_head *jbh = journal->j_sb_buffer;
456 struct problem_context pctx;
457
458 clear_problem_context(&pctx);
459
460 ll_rw_block(READ, 1, &jbh);
461 if (jbh->b_err) {
462 com_err(ctx->device_name, jbh->b_err,
463 _("reading journal superblock\n"));
464 return jbh->b_err;
465 }
466
467 jsb = journal->j_superblock;
468 /* If we don't even have JFS_MAGIC, we probably have a wrong inode */
469 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER))
470 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
471
472 switch (ntohl(jsb->s_header.h_blocktype)) {
473 case JFS_SUPERBLOCK_V1:
474 journal->j_format_version = 1;
475 if (jsb->s_feature_compat ||
476 jsb->s_feature_incompat ||
477 jsb->s_feature_ro_compat ||
478 jsb->s_nr_users)
479 clear_v2_journal_fields(journal);
480 break;
481
482 case JFS_SUPERBLOCK_V2:
483 journal->j_format_version = 2;
484 if (ntohl(jsb->s_nr_users) > 1 &&
485 uuid_is_null(ctx->fs->super->s_journal_uuid))
486 clear_v2_journal_fields(journal);
487 if (ntohl(jsb->s_nr_users) > 1) {
488 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
489 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
490 }
491 break;
492
493 /*
494 * These should never appear in a journal super block, so if
495 * they do, the journal is badly corrupted.
496 */
497 case JFS_DESCRIPTOR_BLOCK:
498 case JFS_COMMIT_BLOCK:
499 case JFS_REVOKE_BLOCK:
500 return EXT2_ET_CORRUPT_SUPERBLOCK;
501
502 /* If we don't understand the superblock major type, but there
503 * is a magic number, then it is likely to be a new format we
504 * just don't understand, so leave it alone. */
505 default:
506 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
507 }
508
509 if (JFS_HAS_INCOMPAT_FEATURE(journal, ~JFS_KNOWN_INCOMPAT_FEATURES))
510 return EXT2_ET_UNSUPP_FEATURE;
511
512 if (JFS_HAS_RO_COMPAT_FEATURE(journal, ~JFS_KNOWN_ROCOMPAT_FEATURES))
513 return EXT2_ET_RO_UNSUPP_FEATURE;
514
515 /* We have now checked whether we know enough about the journal
516 * format to be able to proceed safely, so any other checks that
517 * fail we should attempt to recover from. */
518 if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
519 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
520 _("%s: no valid journal superblock found\n"),
521 ctx->device_name);
522 return EXT2_ET_CORRUPT_SUPERBLOCK;
523 }
524
525 if (ntohl(jsb->s_maxlen) < journal->j_maxlen)
526 journal->j_maxlen = ntohl(jsb->s_maxlen);
527 else if (ntohl(jsb->s_maxlen) > journal->j_maxlen) {
528 com_err(ctx->program_name, EXT2_ET_CORRUPT_SUPERBLOCK,
529 _("%s: journal too short\n"),
530 ctx->device_name);
531 return EXT2_ET_CORRUPT_SUPERBLOCK;
532 }
533
534 journal->j_tail_sequence = ntohl(jsb->s_sequence);
535 journal->j_transaction_sequence = journal->j_tail_sequence;
536 journal->j_tail = ntohl(jsb->s_start);
537 journal->j_first = ntohl(jsb->s_first);
538 journal->j_last = ntohl(jsb->s_maxlen);
539
540 return 0;
541}
542
543static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
544 journal_t *journal)
545{
546 char *p;
547 union {
548 uuid_t uuid;
549 __u32 val[4];
550 } u;
551 __u32 new_seq = 0;
552 int i;
553
554 /* Leave a valid existing V1 superblock signature alone.
555 * Anything unrecognisable we overwrite with a new V2
556 * signature. */
557
558 if (jsb->s_header.h_magic != htonl(JFS_MAGIC_NUMBER) ||
559 jsb->s_header.h_blocktype != htonl(JFS_SUPERBLOCK_V1)) {
560 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
561 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
562 }
563
564 /* Zero out everything else beyond the superblock header */
565
566 p = ((char *) jsb) + sizeof(journal_header_t);
567 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
568
569 jsb->s_blocksize = htonl(ctx->fs->blocksize);
570 jsb->s_maxlen = htonl(journal->j_maxlen);
571 jsb->s_first = htonl(1);
572
573 /* Initialize the journal sequence number so that there is "no"
574 * chance we will find old "valid" transactions in the journal.
575 * This avoids the need to zero the whole journal (slow to do,
576 * and risky when we are just recovering the filesystem).
577 */
578 uuid_generate(u.uuid);
579 for (i = 0; i < 4; i ++)
580 new_seq ^= u.val[i];
581 jsb->s_sequence = htonl(new_seq);
582
583 mark_buffer_dirty(journal->j_sb_buffer);
584 ll_rw_block(WRITE, 1, &journal->j_sb_buffer);
585}
586
587static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
588 journal_t *journal,
589 struct problem_context *pctx)
590{
591 struct ext2_super_block *sb = ctx->fs->super;
592 int recover = ctx->fs->super->s_feature_incompat &
593 EXT3_FEATURE_INCOMPAT_RECOVER;
594
595 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) {
596 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
597 e2fsck_journal_reset_super(ctx, journal->j_superblock,
598 journal);
599 journal->j_transaction_sequence = 1;
600 e2fsck_clear_recover(ctx, recover);
601 return 0;
602 }
603 return EXT2_ET_CORRUPT_SUPERBLOCK;
604 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
605 return EXT2_ET_CORRUPT_SUPERBLOCK;
606
607 return 0;
608}
609
610static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
611 int reset, int drop)
612{
613 journal_superblock_t *jsb;
614
615 if (drop)
616 mark_buffer_clean(journal->j_sb_buffer);
617 else if (!(ctx->options & E2F_OPT_READONLY)) {
618 jsb = journal->j_superblock;
619 jsb->s_sequence = htonl(journal->j_transaction_sequence);
620 if (reset)
621 jsb->s_start = 0; /* this marks the journal as empty */
622 mark_buffer_dirty(journal->j_sb_buffer);
623 }
624 brelse(journal->j_sb_buffer);
625
626 if (ctx->journal_io) {
627 if (ctx->fs && ctx->fs->io != ctx->journal_io)
628 io_channel_close(ctx->journal_io);
629 ctx->journal_io = 0;
630 }
631
632#ifndef USE_INODE_IO
633 if (journal->j_inode)
634 ext2fs_free_mem(&journal->j_inode);
635#endif
636 if (journal->j_fs_dev)
637 ext2fs_free_mem(&journal->j_fs_dev);
638 ext2fs_free_mem(&journal);
639}
640
641/*
642 * This function makes sure that the superblock fields regarding the
643 * journal are consistent.
644 */
645int e2fsck_check_ext3_journal(e2fsck_t ctx)
646{
647 struct ext2_super_block *sb = ctx->fs->super;
648 journal_t *journal;
649 int recover = ctx->fs->super->s_feature_incompat &
650 EXT3_FEATURE_INCOMPAT_RECOVER;
651 struct problem_context pctx;
652 problem_t problem;
653 int reset = 0, force_fsck = 0;
654 int retval;
655
656 /* If we don't have any journal features, don't do anything more */
657 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL) &&
658 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
659 uuid_is_null(sb->s_journal_uuid))
660 return 0;
661
662 clear_problem_context(&pctx);
663 pctx.num = sb->s_journal_inum;
664
665 retval = e2fsck_get_journal(ctx, &journal);
666 if (retval) {
667 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
668 (retval == EXT2_ET_BAD_BLOCK_NUM) ||
669 (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
670 (retval == EXT2_ET_NO_JOURNAL))
671 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
672 return retval;
673 }
674
675 retval = e2fsck_journal_load(journal);
676 if (retval) {
677 if ((retval == EXT2_ET_CORRUPT_SUPERBLOCK) ||
678 ((retval == EXT2_ET_UNSUPP_FEATURE) &&
679 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
680 &pctx))) ||
681 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
682 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
683 &pctx))) ||
684 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
685 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
686 retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
687 &pctx);
688 e2fsck_journal_release(ctx, journal, 0, 1);
689 return retval;
690 }
691
692 /*
693 * We want to make the flags consistent here. We will not leave with
694 * needs_recovery set but has_journal clear. We can't get in a loop
695 * with -y, -n, or -p, only if a user isn't making up their mind.
696 */
697no_has_journal:
698 if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
699 recover = sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER;
700 pctx.str = "inode";
701 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
702 if (recover &&
703 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
704 goto no_has_journal;
705 /*
706 * Need a full fsck if we are releasing a
707 * journal stored on a reserved inode.
708 */
709 force_fsck = recover ||
710 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
711 /* Clear all of the journal fields */
712 sb->s_journal_inum = 0;
713 sb->s_journal_dev = 0;
714 memset(sb->s_journal_uuid, 0,
715 sizeof(sb->s_journal_uuid));
716 e2fsck_clear_recover(ctx, force_fsck);
717 } else if (!(ctx->options & E2F_OPT_READONLY)) {
718 sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
719 ext2fs_mark_super_dirty(ctx->fs);
720 }
721 }
722
723 if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
724 !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
725 journal->j_superblock->s_start != 0) {
726 /* Print status information */
727 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
728 if (ctx->superblock)
729 problem = PR_0_JOURNAL_RUN_DEFAULT;
730 else
731 problem = PR_0_JOURNAL_RUN;
732 if (fix_problem(ctx, problem, &pctx)) {
733 ctx->options |= E2F_OPT_FORCE;
734 sb->s_feature_incompat |=
735 EXT3_FEATURE_INCOMPAT_RECOVER;
736 ext2fs_mark_super_dirty(ctx->fs);
737 } else if (fix_problem(ctx,
738 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
739 reset = 1;
740 sb->s_state &= ~EXT2_VALID_FS;
741 ext2fs_mark_super_dirty(ctx->fs);
742 }
743 /*
744 * If the user answers no to the above question, we
745 * ignore the fact that journal apparently has data;
746 * accidentally replaying over valid data would be far
747 * worse than skipping a questionable recovery.
748 *
749 * XXX should we abort with a fatal error here? What
750 * will the ext3 kernel code do if a filesystem with
751 * !NEEDS_RECOVERY but with a non-zero
752 * journal->j_superblock->s_start is mounted?
753 */
754 }
755
756 e2fsck_journal_release(ctx, journal, reset, 0);
757 return retval;
758}
759
760static errcode_t recover_ext3_journal(e2fsck_t ctx)
761{
762 journal_t *journal;
763 int retval;
764
765 journal_init_revoke_caches();
766 retval = e2fsck_get_journal(ctx, &journal);
767 if (retval)
768 return retval;
769
770 retval = e2fsck_journal_load(journal);
771 if (retval)
772 goto errout;
773
774 retval = journal_init_revoke(journal, 1024);
775 if (retval)
776 goto errout;
777
778 retval = -journal_recover(journal);
779 if (retval)
780 goto errout;
781
782 if (journal->j_superblock->s_errno) {
783 ctx->fs->super->s_state |= EXT2_ERROR_FS;
784 ext2fs_mark_super_dirty(ctx->fs);
785 journal->j_superblock->s_errno = 0;
786 mark_buffer_dirty(journal->j_sb_buffer);
787 }
788
789errout:
790 journal_destroy_revoke(journal);
791 journal_destroy_revoke_caches();
792 e2fsck_journal_release(ctx, journal, 1, 0);
793 return retval;
794}
795
796int e2fsck_run_ext3_journal(e2fsck_t ctx)
797{
798 io_manager io_ptr = ctx->fs->io->manager;
799 int blocksize = ctx->fs->blocksize;
800 errcode_t retval, recover_retval;
801
802 printf(_("%s: recovering journal\n"), ctx->device_name);
803 if (ctx->options & E2F_OPT_READONLY) {
804 printf(_("%s: won't do journal recovery while read-only\n"),
805 ctx->device_name);
806 return EXT2_ET_FILE_RO;
807 }
808
809 if (ctx->fs->flags & EXT2_FLAG_DIRTY)
810 ext2fs_flush(ctx->fs); /* Force out any modifications */
811
812 recover_retval = recover_ext3_journal(ctx);
813
814 /*
815 * Reload the filesystem context to get up-to-date data from disk
816 * because journal recovery will change the filesystem under us.
817 */
818 ext2fs_close(ctx->fs);
819 retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
820 ctx->superblock, blocksize, io_ptr,
821 &ctx->fs);
822
823 if (retval) {
824 com_err(ctx->program_name, retval,
825 _("while trying to re-open %s"),
826 ctx->device_name);
827 fatal_error(ctx, 0);
828 }
829 ctx->fs->priv_data = ctx;
830
831 /* Set the superblock flags */
832 e2fsck_clear_recover(ctx, recover_retval);
833 return recover_retval;
834}
835
836/*
837 * This function will move the journal inode from a visible file in
838 * the filesystem directory hierarchy to the reserved inode if necessary.
839 */
840static const char * const journal_names[] = {
841 ".journal", "journal", ".journal.dat", "journal.dat", 0 };
842
843void e2fsck_move_ext3_journal(e2fsck_t ctx)
844{
845 struct ext2_super_block *sb = ctx->fs->super;
846 struct problem_context pctx;
847 struct ext2_inode inode;
848 ext2_filsys fs = ctx->fs;
849 ext2_ino_t ino;
850 errcode_t retval;
851 const char * const * cpp;
852 int group, mount_flags;
853
854 clear_problem_context(&pctx);
855
856 /*
857 * If the filesystem is opened read-only, or there is no
858 * journal, then do nothing.
859 */
860 if ((ctx->options & E2F_OPT_READONLY) ||
861 (sb->s_journal_inum == 0) ||
862 !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
863 return;
864
865 /*
866 * Read in the journal inode
867 */
868 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
869 return;
870
871 /*
872 * If it's necessary to backup the journal inode, do so.
873 */
874 if ((sb->s_jnl_backup_type == 0) ||
875 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
876 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
877 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
878 memcpy(sb->s_jnl_blocks, inode.i_block,
879 EXT2_N_BLOCKS*4);
880 sb->s_jnl_blocks[16] = inode.i_size;
881 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
882 ext2fs_mark_super_dirty(fs);
883 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
884 }
885 }
886
887 /*
888 * If the journal is already the hidden inode, then do nothing
889 */
890 if (sb->s_journal_inum == EXT2_JOURNAL_INO)
891 return;
892
893 /*
894 * The journal inode had better have only one link and not be readable.
895 */
896 if (inode.i_links_count != 1)
897 return;
898
899 /*
900 * If the filesystem is mounted, or we can't tell whether
901 * or not it's mounted, do nothing.
902 */
903 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
904 if (retval || (mount_flags & EXT2_MF_MOUNTED))
905 return;
906
907 /*
908 * If we can't find the name of the journal inode, then do
909 * nothing.
910 */
911 for (cpp = journal_names; *cpp; cpp++) {
912 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
913 strlen(*cpp), 0, &ino);
914 if ((retval == 0) && (ino == sb->s_journal_inum))
915 break;
916 }
917 if (*cpp == 0)
918 return;
919
920 /* We need the inode bitmap to be loaded */
921 retval = ext2fs_read_bitmaps(fs);
922 if (retval)
923 return;
924
925 pctx.str = *cpp;
926 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
927 return;
928
929 /*
930 * OK, we've done all the checks, let's actually move the
931 * journal inode. Errors at this point mean we need to force
932 * an ext2 filesystem check.
933 */
934 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
935 goto err_out;
936 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
937 goto err_out;
938 sb->s_journal_inum = EXT2_JOURNAL_INO;
939 ext2fs_mark_super_dirty(fs);
940 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
941 inode.i_links_count = 0;
942 inode.i_dtime = time(0);
943 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
944 goto err_out;
945
946 group = ext2fs_group_of_ino(fs, ino);
947 ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
948 ext2fs_mark_ib_dirty(fs);
949 fs->group_desc[group].bg_free_inodes_count++;
950 fs->super->s_free_inodes_count++;
951 return;
952
953err_out:
954 pctx.errcode = retval;
955 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
956 fs->super->s_state &= ~EXT2_VALID_FS;
957 ext2fs_mark_super_dirty(fs);
958 return;
959}
960
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-15 06:24:29 +0000