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 "jfs_user.h"
27 #include "problem.h"
28 #include "uuid/uuid.h"
29
30 static int bh_count = 0;
31
32 /*
33 * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
34 * This creates a larger static binary, and a smaller binary using
35 * shared libraries. It's also probably slightly less CPU-efficient,
36 * which is why it's not on by default. But, it's a good way of
37 * testing the functions in inode_io.c and fileio.c.
38 */
39 #undef USE_INODE_IO
40
41 /* Checksumming functions */
e2fsck_journal_verify_csum_type(journal_t * j,journal_superblock_t * jsb)42 static int e2fsck_journal_verify_csum_type(journal_t *j,
43 journal_superblock_t *jsb)
44 {
45 if (!jbd2_journal_has_csum_v2or3(j))
46 return 1;
47
48 return jsb->s_checksum_type == JBD2_CRC32C_CHKSUM;
49 }
50
e2fsck_journal_sb_csum(journal_superblock_t * jsb)51 static __u32 e2fsck_journal_sb_csum(journal_superblock_t *jsb)
52 {
53 __u32 crc, old_crc;
54
55 old_crc = jsb->s_checksum;
56 jsb->s_checksum = 0;
57 crc = ext2fs_crc32c_le(~0, (unsigned char *)jsb,
58 sizeof(journal_superblock_t));
59 jsb->s_checksum = old_crc;
60
61 return crc;
62 }
63
e2fsck_journal_sb_csum_verify(journal_t * j,journal_superblock_t * jsb)64 static int e2fsck_journal_sb_csum_verify(journal_t *j,
65 journal_superblock_t *jsb)
66 {
67 __u32 provided, calculated;
68
69 if (!jbd2_journal_has_csum_v2or3(j))
70 return 1;
71
72 provided = ext2fs_be32_to_cpu(jsb->s_checksum);
73 calculated = e2fsck_journal_sb_csum(jsb);
74
75 return provided == calculated;
76 }
77
e2fsck_journal_sb_csum_set(journal_t * j,journal_superblock_t * jsb)78 static errcode_t e2fsck_journal_sb_csum_set(journal_t *j,
79 journal_superblock_t *jsb)
80 {
81 __u32 crc;
82
83 if (!jbd2_journal_has_csum_v2or3(j))
84 return 0;
85
86 crc = e2fsck_journal_sb_csum(jsb);
87 jsb->s_checksum = ext2fs_cpu_to_be32(crc);
88 return 0;
89 }
90
91 /* Kernel compatibility functions for handling the journal. These allow us
92 * to use the recovery.c file virtually unchanged from the kernel, so we
93 * don't have to do much to keep kernel and user recovery in sync.
94 */
jbd2_journal_bmap(journal_t * journal,unsigned long block,unsigned long long * phys)95 int jbd2_journal_bmap(journal_t *journal, unsigned long block,
96 unsigned long long *phys)
97 {
98 #ifdef USE_INODE_IO
99 *phys = block;
100 return 0;
101 #else
102 struct inode *inode = journal->j_inode;
103 errcode_t retval;
104 blk64_t pblk;
105
106 if (!inode) {
107 *phys = block;
108 return 0;
109 }
110
111 retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
112 &inode->i_ext2, NULL, 0, (blk64_t) block,
113 0, &pblk);
114 *phys = pblk;
115 return -1 * ((int) retval);
116 #endif
117 }
118
getblk(kdev_t kdev,unsigned long long blocknr,int blocksize)119 struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
120 int blocksize)
121 {
122 struct buffer_head *bh;
123 int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
124 sizeof(bh->b_data);
125
126 bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
127 if (!bh)
128 return NULL;
129
130 if (journal_enable_debug >= 3)
131 bh_count++;
132 jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
133 blocknr, blocksize, bh_count);
134
135 bh->b_ctx = kdev->k_ctx;
136 if (kdev->k_dev == K_DEV_FS)
137 bh->b_io = kdev->k_ctx->fs->io;
138 else
139 bh->b_io = kdev->k_ctx->journal_io;
140 bh->b_size = blocksize;
141 bh->b_blocknr = blocknr;
142
143 return bh;
144 }
145
sync_blockdev(kdev_t kdev)146 int sync_blockdev(kdev_t kdev)
147 {
148 io_channel io;
149
150 if (kdev->k_dev == K_DEV_FS)
151 io = kdev->k_ctx->fs->io;
152 else
153 io = kdev->k_ctx->journal_io;
154
155 return io_channel_flush(io) ? -EIO : 0;
156 }
157
ll_rw_block(int rw,int op_flags EXT2FS_ATTR ((unused)),int nr,struct buffer_head * bhp[])158 void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
159 struct buffer_head *bhp[])
160 {
161 errcode_t retval;
162 struct buffer_head *bh;
163
164 for (; nr > 0; --nr) {
165 bh = *bhp++;
166 if (rw == REQ_OP_READ && !bh->b_uptodate) {
167 jfs_debug(3, "reading block %llu/%p\n",
168 bh->b_blocknr, (void *) bh);
169 retval = io_channel_read_blk64(bh->b_io,
170 bh->b_blocknr,
171 1, bh->b_data);
172 if (retval) {
173 com_err(bh->b_ctx->device_name, retval,
174 "while reading block %llu\n",
175 bh->b_blocknr);
176 bh->b_err = (int) retval;
177 continue;
178 }
179 bh->b_uptodate = 1;
180 } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
181 jfs_debug(3, "writing block %llu/%p\n",
182 bh->b_blocknr,
183 (void *) bh);
184 retval = io_channel_write_blk64(bh->b_io,
185 bh->b_blocknr,
186 1, bh->b_data);
187 if (retval) {
188 com_err(bh->b_ctx->device_name, retval,
189 "while writing block %llu\n",
190 bh->b_blocknr);
191 bh->b_err = (int) retval;
192 continue;
193 }
194 bh->b_dirty = 0;
195 bh->b_uptodate = 1;
196 } else {
197 jfs_debug(3, "no-op %s for block %llu\n",
198 rw == REQ_OP_READ ? "read" : "write",
199 bh->b_blocknr);
200 }
201 }
202 }
203
mark_buffer_dirty(struct buffer_head * bh)204 void mark_buffer_dirty(struct buffer_head *bh)
205 {
206 bh->b_dirty = 1;
207 }
208
mark_buffer_clean(struct buffer_head * bh)209 static void mark_buffer_clean(struct buffer_head * bh)
210 {
211 bh->b_dirty = 0;
212 }
213
brelse(struct buffer_head * bh)214 void brelse(struct buffer_head *bh)
215 {
216 if (bh->b_dirty)
217 ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
218 jfs_debug(3, "freeing block %llu/%p (total %d)\n",
219 bh->b_blocknr, (void *) bh, --bh_count);
220 ext2fs_free_mem(&bh);
221 }
222
buffer_uptodate(struct buffer_head * bh)223 int buffer_uptodate(struct buffer_head *bh)
224 {
225 return bh->b_uptodate;
226 }
227
mark_buffer_uptodate(struct buffer_head * bh,int val)228 void mark_buffer_uptodate(struct buffer_head *bh, int val)
229 {
230 bh->b_uptodate = val;
231 }
232
wait_on_buffer(struct buffer_head * bh)233 void wait_on_buffer(struct buffer_head *bh)
234 {
235 if (!bh->b_uptodate)
236 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
237 }
238
239
e2fsck_clear_recover(e2fsck_t ctx,int error)240 static void e2fsck_clear_recover(e2fsck_t ctx, int error)
241 {
242 ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
243
244 /* if we had an error doing journal recovery, we need a full fsck */
245 if (error)
246 ctx->fs->super->s_state &= ~EXT2_VALID_FS;
247 ext2fs_mark_super_dirty(ctx->fs);
248 }
249
250 /*
251 * This is a helper function to check the validity of the journal.
252 */
253 struct process_block_struct {
254 e2_blkcnt_t last_block;
255 };
256
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)257 static int process_journal_block(ext2_filsys fs,
258 blk64_t *block_nr,
259 e2_blkcnt_t blockcnt,
260 blk64_t ref_block EXT2FS_ATTR((unused)),
261 int ref_offset EXT2FS_ATTR((unused)),
262 void *priv_data)
263 {
264 struct process_block_struct *p;
265 blk64_t blk = *block_nr;
266
267 p = (struct process_block_struct *) priv_data;
268
269 if (!blk || blk < fs->super->s_first_data_block ||
270 blk >= ext2fs_blocks_count(fs->super))
271 return BLOCK_ABORT;
272
273 if (blockcnt >= 0)
274 p->last_block = blockcnt;
275 return 0;
276 }
277
ext4_fc_replay_scan(journal_t * j,struct buffer_head * bh,int off,tid_t expected_tid)278 static int ext4_fc_replay_scan(journal_t *j, struct buffer_head *bh,
279 int off, tid_t expected_tid)
280 {
281 e2fsck_t ctx = j->j_fs_dev->k_ctx;
282 struct e2fsck_fc_replay_state *state;
283 int ret = JBD2_FC_REPLAY_CONTINUE;
284 struct ext4_fc_add_range ext;
285 struct ext4_fc_tl tl;
286 struct ext4_fc_tail tail;
287 __u8 *start, *cur, *end, *val;
288 struct ext4_fc_head head;
289 struct ext2fs_extent ext2fs_ex = {0};
290
291 state = &ctx->fc_replay_state;
292
293 start = (__u8 *)bh->b_data;
294 end = (__u8 *)bh->b_data + j->j_blocksize - 1;
295
296 jbd_debug(1, "Scan phase starting, expected %d", expected_tid);
297 if (state->fc_replay_expected_off == 0) {
298 memset(state, 0, sizeof(*state));
299 /* Check if we can stop early */
300 if (le16_to_cpu(((struct ext4_fc_tl *)start)->fc_tag)
301 != EXT4_FC_TAG_HEAD) {
302 jbd_debug(1, "Ending early!, not a head tag");
303 return 0;
304 }
305 }
306
307 if (off != state->fc_replay_expected_off) {
308 ret = -EFSCORRUPTED;
309 goto out_err;
310 }
311
312 state->fc_replay_expected_off++;
313 for (cur = start; cur < end; cur = cur + le16_to_cpu(tl.fc_len) + sizeof(tl)) {
314 memcpy(&tl, cur, sizeof(tl));
315 val = cur + sizeof(tl);
316
317 jbd_debug(3, "Scan phase, tag:%s, blk %lld\n",
318 tag2str(le16_to_cpu(tl.fc_tag)), bh->b_blocknr);
319 switch (le16_to_cpu(tl.fc_tag)) {
320 case EXT4_FC_TAG_ADD_RANGE:
321 memcpy(&ext, val, sizeof(ext));
322 ret = ext2fs_decode_extent(&ext2fs_ex,
323 (void *)&ext.fc_ex,
324 sizeof(ext.fc_ex));
325 if (ret)
326 ret = JBD2_FC_REPLAY_STOP;
327 else
328 ret = JBD2_FC_REPLAY_CONTINUE;
329 /* fallthrough */
330 case EXT4_FC_TAG_DEL_RANGE:
331 case EXT4_FC_TAG_LINK:
332 case EXT4_FC_TAG_UNLINK:
333 case EXT4_FC_TAG_CREAT:
334 case EXT4_FC_TAG_INODE:
335 case EXT4_FC_TAG_PAD:
336 state->fc_cur_tag++;
337 state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
338 sizeof(tl) + ext4_fc_tag_len(&tl));
339 break;
340 case EXT4_FC_TAG_TAIL:
341 state->fc_cur_tag++;
342 memcpy(&tail, val, sizeof(tail));
343 state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
344 sizeof(tl) +
345 offsetof(struct ext4_fc_tail,
346 fc_crc));
347 jbd_debug(1, "tail tid %d, expected %d\n",
348 le32_to_cpu(tail.fc_tid), expected_tid);
349 if (le32_to_cpu(tail.fc_tid) == expected_tid &&
350 le32_to_cpu(tail.fc_crc) == state->fc_crc) {
351 state->fc_replay_num_tags = state->fc_cur_tag;
352 } else {
353 ret = state->fc_replay_num_tags ?
354 JBD2_FC_REPLAY_STOP : -EFSBADCRC;
355 }
356 state->fc_crc = 0;
357 break;
358 case EXT4_FC_TAG_HEAD:
359 memcpy(&head, val, sizeof(head));
360 if (le32_to_cpu(head.fc_features) &
361 ~EXT4_FC_SUPPORTED_FEATURES) {
362 ret = -EOPNOTSUPP;
363 break;
364 }
365 if (le32_to_cpu(head.fc_tid) != expected_tid) {
366 ret = -EINVAL;
367 break;
368 }
369 state->fc_cur_tag++;
370 state->fc_crc = jbd2_chksum(j, state->fc_crc, cur,
371 sizeof(tl) + ext4_fc_tag_len(&tl));
372 break;
373 default:
374 ret = state->fc_replay_num_tags ?
375 JBD2_FC_REPLAY_STOP : -ECANCELED;
376 }
377 if (ret < 0 || ret == JBD2_FC_REPLAY_STOP)
378 break;
379 }
380
381 out_err:
382 return ret;
383 }
384
__errcode_to_errno(errcode_t err,const char * func,int line)385 static int __errcode_to_errno(errcode_t err, const char *func, int line)
386 {
387 if (err == 0)
388 return 0;
389 fprintf(stderr, "Error \"%s\" encountered in function %s at line %d\n",
390 error_message(err), func, line);
391 if (err <= 256)
392 return -err;
393 return -EFAULT;
394 }
395
396 #define errcode_to_errno(err) __errcode_to_errno(err, __func__, __LINE__)
397
398 #define ex_end(__ex) ((__ex)->e_lblk + (__ex)->e_len - 1)
399 #define ex_pend(__ex) ((__ex)->e_pblk + (__ex)->e_len - 1)
400
make_room(struct extent_list * list,int i)401 static int make_room(struct extent_list *list, int i)
402 {
403 int ret;
404
405 if (list->count == list->size) {
406 unsigned int new_size = (list->size + 341) *
407 sizeof(struct ext2fs_extent);
408 ret = errcode_to_errno(ext2fs_resize_mem(0, new_size, &list->extents));
409 if (ret)
410 return ret;
411 list->size += 341;
412 }
413
414 memmove(&list->extents[i + 1], &list->extents[i],
415 sizeof(list->extents[0]) * (list->count - i));
416 list->count++;
417 return 0;
418 }
419
ex_compar(const void * arg1,const void * arg2)420 static int ex_compar(const void *arg1, const void *arg2)
421 {
422 const struct ext2fs_extent *ex1 = (const struct ext2fs_extent *)arg1;
423 const struct ext2fs_extent *ex2 = (const struct ext2fs_extent *)arg2;
424
425 if (ex1->e_lblk < ex2->e_lblk)
426 return -1;
427 if (ex1->e_lblk > ex2->e_lblk)
428 return 1;
429 return ex1->e_len - ex2->e_len;
430 }
431
ex_len_compar(const void * arg1,const void * arg2)432 static int ex_len_compar(const void *arg1, const void *arg2)
433 {
434 const struct ext2fs_extent *ex1 = (const struct ext2fs_extent *)arg1;
435 const struct ext2fs_extent *ex2 = (const struct ext2fs_extent *)arg2;
436
437 if (ex1->e_len < ex2->e_len)
438 return 1;
439
440 if (ex1->e_lblk > ex2->e_lblk)
441 return -1;
442
443 return 0;
444 }
445
ex_sort_and_merge(struct extent_list * list)446 static void ex_sort_and_merge(struct extent_list *list)
447 {
448 unsigned int i, j;
449
450 if (list->count < 2)
451 return;
452
453 /*
454 * Reverse sort by length, that way we strip off all the 0 length
455 * extents
456 */
457 qsort(list->extents, list->count, sizeof(struct ext2fs_extent),
458 ex_len_compar);
459
460 for (i = 0; i < list->count; i++) {
461 if (list->extents[i].e_len == 0) {
462 list->count = i;
463 break;
464 }
465 }
466
467 if (list->count == 0)
468 return;
469
470 /* Now sort by logical offset */
471 qsort(list->extents, list->count, sizeof(list->extents[0]),
472 ex_compar);
473
474 /* Merge adjacent extents if they are logically and physically contiguous */
475 i = 0;
476 while (i < list->count - 1) {
477 if (ex_end(&list->extents[i]) + 1 != list->extents[i + 1].e_lblk ||
478 ex_pend(&list->extents[i]) + 1 != list->extents[i + 1].e_pblk ||
479 (list->extents[i].e_flags & EXT2_EXTENT_FLAGS_UNINIT) !=
480 (list->extents[i + 1].e_flags & EXT2_EXTENT_FLAGS_UNINIT)) {
481 i++;
482 continue;
483 }
484
485 list->extents[i].e_len += list->extents[i + 1].e_len;
486 for (j = i + 1; j < list->count - 1; j++)
487 list->extents[j] = list->extents[j + 1];
488 list->count--;
489 }
490 }
491
492 /* must free blocks that are released */
ext4_modify_extent_list(e2fsck_t ctx,struct extent_list * list,struct ext2fs_extent * ex,int del)493 static int ext4_modify_extent_list(e2fsck_t ctx, struct extent_list *list,
494 struct ext2fs_extent *ex, int del)
495 {
496 int ret, offset;
497 unsigned int i;
498 struct ext2fs_extent add_ex = *ex;
499
500 /* First let's create a hole from ex->e_lblk of length ex->e_len */
501 for (i = 0; i < list->count; i++) {
502 if (ex_end(&list->extents[i]) < add_ex.e_lblk)
503 continue;
504
505 /* Case 1: No overlap */
506 if (list->extents[i].e_lblk > ex_end(&add_ex))
507 break;
508 /*
509 * Unmark all the blocks in bb now. All the blocks get marked
510 * before we exit this function.
511 */
512 ext2fs_unmark_block_bitmap_range2(ctx->fs->block_map,
513 list->extents[i].e_pblk, list->extents[i].e_len);
514 /* Case 2: Split */
515 if (list->extents[i].e_lblk < add_ex.e_lblk &&
516 ex_end(&list->extents[i]) > ex_end(&add_ex)) {
517 ret = make_room(list, i + 1);
518 if (ret)
519 return ret;
520 list->extents[i + 1] = list->extents[i];
521 offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
522 list->extents[i + 1].e_lblk += offset;
523 list->extents[i + 1].e_pblk += offset;
524 list->extents[i + 1].e_len -= offset;
525 list->extents[i].e_len =
526 add_ex.e_lblk - list->extents[i].e_lblk;
527 break;
528 }
529
530 /* Case 3: Exact overlap */
531 if (add_ex.e_lblk <= list->extents[i].e_lblk &&
532 ex_end(&list->extents[i]) <= ex_end(&add_ex)) {
533
534 list->extents[i].e_len = 0;
535 continue;
536 }
537
538 /* Case 4: Partial overlap */
539 if (ex_end(&list->extents[i]) > ex_end(&add_ex)) {
540 offset = ex_end(&add_ex) + 1 - list->extents[i].e_lblk;
541 list->extents[i].e_lblk += offset;
542 list->extents[i].e_pblk += offset;
543 list->extents[i].e_len -= offset;
544 break;
545 }
546
547 if (ex_end(&add_ex) >= ex_end(&list->extents[i]))
548 list->extents[i].e_len =
549 add_ex.e_lblk > list->extents[i].e_lblk ?
550 add_ex.e_lblk - list->extents[i].e_lblk : 0;
551 }
552
553 if (add_ex.e_len && !del) {
554 make_room(list, list->count);
555 list->extents[list->count - 1] = add_ex;
556 }
557
558 ex_sort_and_merge(list);
559
560 /* Mark all occupied blocks allocated */
561 for (i = 0; i < list->count; i++)
562 ext2fs_mark_block_bitmap_range2(ctx->fs->block_map,
563 list->extents[i].e_pblk, list->extents[i].e_len);
564 ext2fs_mark_bb_dirty(ctx->fs);
565
566 return 0;
567 }
568
ext4_add_extent_to_list(e2fsck_t ctx,struct extent_list * list,struct ext2fs_extent * ex)569 static int ext4_add_extent_to_list(e2fsck_t ctx, struct extent_list *list,
570 struct ext2fs_extent *ex)
571 {
572 return ext4_modify_extent_list(ctx, list, ex, 0 /* add */);
573 }
574
ext4_del_extent_from_list(e2fsck_t ctx,struct extent_list * list,struct ext2fs_extent * ex)575 static int ext4_del_extent_from_list(e2fsck_t ctx, struct extent_list *list,
576 struct ext2fs_extent *ex)
577 {
578 return ext4_modify_extent_list(ctx, list, ex, 1 /* delete */);
579 }
580
ext4_fc_read_extents(e2fsck_t ctx,ext2_ino_t ino)581 static int ext4_fc_read_extents(e2fsck_t ctx, ext2_ino_t ino)
582 {
583 struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
584
585 if (extent_list->ino == ino)
586 return 0;
587
588 extent_list->ino = ino;
589 return errcode_to_errno(e2fsck_read_extents(ctx, extent_list));
590 }
591
592 /*
593 * Flush extents in replay state on disk. @ino is the inode that is going
594 * to be processed next. So, we hold back flushing of the extent list
595 * if the next inode that's going to be processed is same as the one with
596 * cached extents in our replay state. That allows us to gather multiple extents
597 * for the inode so that we can flush all of them at once and it also saves us
598 * from continuously growing and shrinking the extent tree.
599 */
ext4_fc_flush_extents(e2fsck_t ctx,ext2_ino_t ino)600 static void ext4_fc_flush_extents(e2fsck_t ctx, ext2_ino_t ino)
601 {
602 struct extent_list *extent_list = &ctx->fc_replay_state.fc_extent_list;
603
604 if (extent_list->ino == ino || extent_list->ino == 0)
605 return;
606 e2fsck_rewrite_extent_tree(ctx, extent_list);
607 ext2fs_free_mem(&extent_list->extents);
608 memset(extent_list, 0, sizeof(*extent_list));
609 }
610
611 /* Helper struct for dentry replay routines */
612 struct dentry_info_args {
613 ext2_ino_t parent_ino;
614 int dname_len;
615 ext2_ino_t ino;
616 char *dname;
617 };
618
tl_to_darg(struct dentry_info_args * darg,struct ext4_fc_tl * tl,__u8 * val)619 static inline int tl_to_darg(struct dentry_info_args *darg,
620 struct ext4_fc_tl *tl, __u8 *val)
621 {
622 struct ext4_fc_dentry_info fcd;
623
624 memcpy(&fcd, val, sizeof(fcd));
625
626 darg->parent_ino = le32_to_cpu(fcd.fc_parent_ino);
627 darg->ino = le32_to_cpu(fcd.fc_ino);
628 darg->dname_len = ext4_fc_tag_len(tl) -
629 sizeof(struct ext4_fc_dentry_info);
630 darg->dname = malloc(darg->dname_len + 1);
631 if (!darg->dname)
632 return -ENOMEM;
633 memcpy(darg->dname,
634 val + sizeof(struct ext4_fc_dentry_info),
635 darg->dname_len);
636 darg->dname[darg->dname_len] = 0;
637 jbd_debug(1, "%s: %s, ino %u, parent %u\n",
638 le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_CREAT ? "create" :
639 (le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_LINK ? "link" :
640 (le16_to_cpu(tl->fc_tag) == EXT4_FC_TAG_UNLINK ? "unlink" :
641 "error")), darg->dname, darg->ino, darg->parent_ino);
642 return 0;
643 }
644
ext4_fc_handle_unlink(e2fsck_t ctx,struct ext4_fc_tl * tl,__u8 * val)645 static int ext4_fc_handle_unlink(e2fsck_t ctx, struct ext4_fc_tl *tl, __u8 *val)
646 {
647 struct dentry_info_args darg;
648 int ret;
649
650 ret = tl_to_darg(&darg, tl, val);
651 if (ret)
652 return ret;
653 ext4_fc_flush_extents(ctx, darg.ino);
654 ret = errcode_to_errno(ext2fs_unlink(ctx->fs, darg.parent_ino,
655 darg.dname, darg.ino, 0));
656 /* It's okay if the above call fails */
657 free(darg.dname);
658
659 return ret;
660 }
661
ext4_fc_handle_link_and_create(e2fsck_t ctx,struct ext4_fc_tl * tl,__u8 * val)662 static int ext4_fc_handle_link_and_create(e2fsck_t ctx, struct ext4_fc_tl *tl, __u8 *val)
663 {
664 struct dentry_info_args darg;
665 ext2_filsys fs = ctx->fs;
666 struct ext2_inode_large inode_large;
667 int ret, filetype, mode;
668
669 ret = tl_to_darg(&darg, tl, val);
670 if (ret)
671 return ret;
672 ext4_fc_flush_extents(ctx, 0);
673 ret = errcode_to_errno(ext2fs_read_inode(fs, darg.ino,
674 (struct ext2_inode *)&inode_large));
675 if (ret)
676 goto out;
677
678 mode = inode_large.i_mode;
679
680 if (LINUX_S_ISREG(mode))
681 filetype = EXT2_FT_REG_FILE;
682 else if (LINUX_S_ISDIR(mode))
683 filetype = EXT2_FT_DIR;
684 else if (LINUX_S_ISCHR(mode))
685 filetype = EXT2_FT_CHRDEV;
686 else if (LINUX_S_ISBLK(mode))
687 filetype = EXT2_FT_BLKDEV;
688 else if (LINUX_S_ISLNK(mode))
689 return EXT2_FT_SYMLINK;
690 else if (LINUX_S_ISFIFO(mode))
691 filetype = EXT2_FT_FIFO;
692 else if (LINUX_S_ISSOCK(mode))
693 filetype = EXT2_FT_SOCK;
694 else {
695 ret = -EINVAL;
696 goto out;
697 }
698
699 /*
700 * Forcefully unlink if the same name is present and ignore the error
701 * if any, since this dirent might not exist
702 */
703 ext2fs_unlink(fs, darg.parent_ino, darg.dname, darg.ino,
704 EXT2FS_UNLINK_FORCE);
705
706 ret = errcode_to_errno(
707 ext2fs_link(fs, darg.parent_ino, darg.dname, darg.ino,
708 filetype));
709 out:
710 free(darg.dname);
711 return ret;
712
713 }
714
715 /* This function fixes the i_blocks field in the replayed indoe */
ext4_fc_replay_fixup_iblocks(struct ext2_inode_large * ondisk_inode,struct ext2_inode_large * fc_inode)716 static void ext4_fc_replay_fixup_iblocks(struct ext2_inode_large *ondisk_inode,
717 struct ext2_inode_large *fc_inode)
718 {
719 if (ondisk_inode->i_flags & EXT4_EXTENTS_FL) {
720 struct ext3_extent_header *eh;
721
722 eh = (struct ext3_extent_header *)(&ondisk_inode->i_block[0]);
723 if (le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC) {
724 memset(eh, 0, sizeof(*eh));
725 eh->eh_magic = cpu_to_le16(EXT3_EXT_MAGIC);
726 eh->eh_max = cpu_to_le16(
727 (sizeof(ondisk_inode->i_block) -
728 sizeof(struct ext3_extent_header)) /
729 sizeof(struct ext3_extent));
730 }
731 } else if (ondisk_inode->i_flags & EXT4_INLINE_DATA_FL) {
732 memcpy(ondisk_inode->i_block, fc_inode->i_block,
733 sizeof(fc_inode->i_block));
734 }
735 }
736
ext4_fc_handle_inode(e2fsck_t ctx,__u8 * val)737 static int ext4_fc_handle_inode(e2fsck_t ctx, __u8 *val)
738 {
739 int ino, inode_len = EXT2_GOOD_OLD_INODE_SIZE;
740 struct ext2_inode_large *inode = NULL, *fc_inode = NULL;
741 __le32 fc_ino;
742 __u8 *fc_raw_inode;
743 errcode_t err;
744 blk64_t blks;
745
746 memcpy(&fc_ino, val, sizeof(fc_ino));
747 fc_raw_inode = val + sizeof(fc_ino);
748 ino = le32_to_cpu(fc_ino);
749
750 if (EXT2_INODE_SIZE(ctx->fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
751 __u16 extra_isize = ext2fs_le16_to_cpu(
752 ((struct ext2_inode_large *)fc_raw_inode)->i_extra_isize);
753
754 if ((extra_isize < (sizeof(inode->i_extra_isize) +
755 sizeof(inode->i_checksum_hi))) ||
756 (extra_isize > (EXT2_INODE_SIZE(ctx->fs->super) -
757 EXT2_GOOD_OLD_INODE_SIZE))) {
758 err = EFSCORRUPTED;
759 goto out;
760 }
761 inode_len += extra_isize;
762 }
763 err = ext2fs_get_mem(inode_len, &inode);
764 if (err)
765 goto out;
766 err = ext2fs_get_mem(inode_len, &fc_inode);
767 if (err)
768 goto out;
769 ext4_fc_flush_extents(ctx, ino);
770
771 err = ext2fs_read_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
772 inode_len);
773 if (err)
774 goto out;
775 memcpy(fc_inode, fc_raw_inode, inode_len);
776 #ifdef WORDS_BIGENDIAN
777 ext2fs_swap_inode_full(ctx->fs, fc_inode, fc_inode, 0, inode_len);
778 #endif
779 memcpy(inode, fc_inode, offsetof(struct ext2_inode_large, i_block));
780 memcpy(&inode->i_generation, &fc_inode->i_generation,
781 inode_len - offsetof(struct ext2_inode_large, i_generation));
782 ext4_fc_replay_fixup_iblocks(inode, fc_inode);
783 err = ext2fs_count_blocks(ctx->fs, ino, EXT2_INODE(inode), &blks);
784 if (err)
785 goto out;
786 ext2fs_iblk_set(ctx->fs, EXT2_INODE(inode), blks);
787 ext2fs_inode_csum_set(ctx->fs, ino, inode);
788
789 err = ext2fs_write_inode_full(ctx->fs, ino, (struct ext2_inode *)inode,
790 inode_len);
791 if (err)
792 goto out;
793 if (inode->i_links_count)
794 ext2fs_mark_inode_bitmap2(ctx->fs->inode_map, ino);
795 else
796 ext2fs_unmark_inode_bitmap2(ctx->fs->inode_map, ino);
797 ext2fs_mark_ib_dirty(ctx->fs);
798
799 out:
800 ext2fs_free_mem(&inode);
801 ext2fs_free_mem(&fc_inode);
802 return errcode_to_errno(err);
803 }
804
805 /*
806 * Handle add extent replay tag.
807 */
ext4_fc_handle_add_extent(e2fsck_t ctx,__u8 * val)808 static int ext4_fc_handle_add_extent(e2fsck_t ctx, __u8 *val)
809 {
810 struct ext2fs_extent extent;
811 struct ext4_fc_add_range add_range;
812 ext2_ino_t ino;
813 int ret = 0;
814
815 memcpy(&add_range, val, sizeof(add_range));
816 ino = le32_to_cpu(add_range.fc_ino);
817 ext4_fc_flush_extents(ctx, ino);
818
819 ret = ext4_fc_read_extents(ctx, ino);
820 if (ret)
821 return ret;
822 memset(&extent, 0, sizeof(extent));
823 ret = errcode_to_errno(ext2fs_decode_extent(
824 &extent, (void *)add_range.fc_ex,
825 sizeof(add_range.fc_ex)));
826 if (ret)
827 return ret;
828 return ext4_add_extent_to_list(ctx,
829 &ctx->fc_replay_state.fc_extent_list, &extent);
830 }
831
832 /*
833 * Handle delete logical range replay tag.
834 */
ext4_fc_handle_del_range(e2fsck_t ctx,__u8 * val)835 static int ext4_fc_handle_del_range(e2fsck_t ctx, __u8 *val)
836 {
837 struct ext2fs_extent extent;
838 struct ext4_fc_del_range del_range;
839 int ret, ino;
840
841 memcpy(&del_range, val, sizeof(del_range));
842 ino = le32_to_cpu(del_range.fc_ino);
843 ext4_fc_flush_extents(ctx, ino);
844
845 memset(&extent, 0, sizeof(extent));
846 extent.e_lblk = le32_to_cpu(del_range.fc_lblk);
847 extent.e_len = le32_to_cpu(del_range.fc_len);
848 ret = ext4_fc_read_extents(ctx, ino);
849 if (ret)
850 return ret;
851 return ext4_del_extent_from_list(ctx,
852 &ctx->fc_replay_state.fc_extent_list, &extent);
853 }
854
855 /*
856 * Main recovery path entry point. This function returns JBD2_FC_REPLAY_CONTINUE
857 * to indicate that it is expecting more fast commit blocks. It returns
858 * JBD2_FC_REPLAY_STOP to indicate that replay is done.
859 */
ext4_fc_replay(journal_t * journal,struct buffer_head * bh,enum passtype pass,int off,tid_t expected_tid)860 static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
861 enum passtype pass, int off, tid_t expected_tid)
862 {
863 e2fsck_t ctx = journal->j_fs_dev->k_ctx;
864 struct e2fsck_fc_replay_state *state = &ctx->fc_replay_state;
865 int ret = JBD2_FC_REPLAY_CONTINUE;
866 struct ext4_fc_tl tl;
867 __u8 *start, *end, *cur, *val;
868
869 if (pass == PASS_SCAN) {
870 state->fc_current_pass = PASS_SCAN;
871 return ext4_fc_replay_scan(journal, bh, off, expected_tid);
872 }
873
874 if (state->fc_replay_num_tags == 0)
875 goto replay_done;
876
877 if (state->fc_current_pass != pass) {
878 /* Starting replay phase */
879 state->fc_current_pass = pass;
880 /* We will reset checksums */
881 ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
882 ret = errcode_to_errno(ext2fs_read_bitmaps(ctx->fs));
883 if (ret) {
884 jbd_debug(1, "Error %d while reading bitmaps\n", ret);
885 return ret;
886 }
887 state->fc_super_state = ctx->fs->super->s_state;
888 /*
889 * Mark the file system to indicate it contains errors. That's
890 * because the updates performed by fast commit replay code are
891 * not atomic and may result in inconsistent file system if it
892 * crashes before the replay is complete.
893 */
894 ctx->fs->super->s_state |= EXT2_ERROR_FS;
895 ctx->fs->super->s_state |= EXT4_FC_REPLAY;
896 ext2fs_mark_super_dirty(ctx->fs);
897 ext2fs_flush(ctx->fs);
898 }
899
900 start = (__u8 *)bh->b_data;
901 end = (__u8 *)bh->b_data + journal->j_blocksize - 1;
902
903 for (cur = start; cur < end; cur = cur + le16_to_cpu(tl.fc_len) + sizeof(tl)) {
904 memcpy(&tl, cur, sizeof(tl));
905 val = cur + sizeof(tl);
906
907 if (state->fc_replay_num_tags == 0)
908 goto replay_done;
909 jbd_debug(3, "Replay phase processing %s tag\n",
910 tag2str(le16_to_cpu(tl.fc_tag)));
911 state->fc_replay_num_tags--;
912 switch (le16_to_cpu(tl.fc_tag)) {
913 case EXT4_FC_TAG_CREAT:
914 case EXT4_FC_TAG_LINK:
915 ret = ext4_fc_handle_link_and_create(ctx, &tl, val);
916 break;
917 case EXT4_FC_TAG_UNLINK:
918 ret = ext4_fc_handle_unlink(ctx, &tl, val);
919 break;
920 case EXT4_FC_TAG_ADD_RANGE:
921 ret = ext4_fc_handle_add_extent(ctx, val);
922 break;
923 case EXT4_FC_TAG_DEL_RANGE:
924 ret = ext4_fc_handle_del_range(ctx, val);
925 break;
926 case EXT4_FC_TAG_INODE:
927 ret = ext4_fc_handle_inode(ctx, val);
928 break;
929 case EXT4_FC_TAG_TAIL:
930 ext4_fc_flush_extents(ctx, 0);
931 case EXT4_FC_TAG_PAD:
932 case EXT4_FC_TAG_HEAD:
933 break;
934 default:
935 ret = -ECANCELED;
936 break;
937 }
938 if (ret < 0)
939 break;
940 ret = JBD2_FC_REPLAY_CONTINUE;
941 }
942 return ret;
943 replay_done:
944 jbd_debug(1, "End of fast commit replay\n");
945 if (state->fc_current_pass != pass)
946 return JBD2_FC_REPLAY_STOP;
947
948 ext2fs_calculate_summary_stats(ctx->fs, 0 /* update bg also */);
949 ext2fs_write_block_bitmap(ctx->fs);
950 ext2fs_write_inode_bitmap(ctx->fs);
951 ext2fs_mark_super_dirty(ctx->fs);
952 ext2fs_set_gdt_csum(ctx->fs);
953 ctx->fs->super->s_state = state->fc_super_state;
954 ext2fs_flush(ctx->fs);
955
956 return JBD2_FC_REPLAY_STOP;
957 }
958
e2fsck_get_journal(e2fsck_t ctx,journal_t ** ret_journal)959 static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
960 {
961 struct process_block_struct pb;
962 struct ext2_super_block *sb = ctx->fs->super;
963 struct ext2_super_block jsuper;
964 struct problem_context pctx;
965 struct buffer_head *bh;
966 struct inode *j_inode = NULL;
967 struct kdev_s *dev_fs = NULL, *dev_journal;
968 const char *journal_name = 0;
969 journal_t *journal = NULL;
970 errcode_t retval = 0;
971 io_manager io_ptr = 0;
972 unsigned long long start = 0;
973 int ret;
974 int ext_journal = 0;
975 int tried_backup_jnl = 0;
976
977 clear_problem_context(&pctx);
978
979 journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal");
980 if (!journal) {
981 return EXT2_ET_NO_MEMORY;
982 }
983
984 dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev");
985 if (!dev_fs) {
986 retval = EXT2_ET_NO_MEMORY;
987 goto errout;
988 }
989 dev_journal = dev_fs+1;
990
991 dev_fs->k_ctx = dev_journal->k_ctx = ctx;
992 dev_fs->k_dev = K_DEV_FS;
993 dev_journal->k_dev = K_DEV_JOURNAL;
994
995 journal->j_dev = dev_journal;
996 journal->j_fs_dev = dev_fs;
997 journal->j_inode = NULL;
998 journal->j_blocksize = ctx->fs->blocksize;
999
1000 if (uuid_is_null(sb->s_journal_uuid)) {
1001 /*
1002 * The full set of superblock sanity checks haven't
1003 * been performed yet, so we need to do some basic
1004 * checks here to avoid potential array overruns.
1005 */
1006 if (!sb->s_journal_inum ||
1007 (sb->s_journal_inum >
1008 (ctx->fs->group_desc_count * sb->s_inodes_per_group))) {
1009 retval = EXT2_ET_BAD_INODE_NUM;
1010 goto errout;
1011 }
1012 j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode),
1013 "journal inode");
1014 if (!j_inode) {
1015 retval = EXT2_ET_NO_MEMORY;
1016 goto errout;
1017 }
1018
1019 j_inode->i_ctx = ctx;
1020 j_inode->i_ino = sb->s_journal_inum;
1021
1022 if ((retval = ext2fs_read_inode(ctx->fs,
1023 sb->s_journal_inum,
1024 &j_inode->i_ext2))) {
1025 try_backup_journal:
1026 if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS ||
1027 tried_backup_jnl)
1028 goto errout;
1029 memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode));
1030 memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks,
1031 EXT2_N_BLOCKS*4);
1032 j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15];
1033 j_inode->i_ext2.i_size = sb->s_jnl_blocks[16];
1034 j_inode->i_ext2.i_links_count = 1;
1035 j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600;
1036 e2fsck_use_inode_shortcuts(ctx, 1);
1037 ctx->stashed_ino = j_inode->i_ino;
1038 ctx->stashed_inode = &j_inode->i_ext2;
1039 tried_backup_jnl++;
1040 }
1041 if (!j_inode->i_ext2.i_links_count ||
1042 !LINUX_S_ISREG(j_inode->i_ext2.i_mode) ||
1043 (j_inode->i_ext2.i_flags & EXT4_ENCRYPT_FL)) {
1044 retval = EXT2_ET_NO_JOURNAL;
1045 goto try_backup_journal;
1046 }
1047 if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize <
1048 JBD2_MIN_JOURNAL_BLOCKS) {
1049 retval = EXT2_ET_JOURNAL_TOO_SMALL;
1050 goto try_backup_journal;
1051 }
1052 pb.last_block = -1;
1053 retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino,
1054 BLOCK_FLAG_HOLE, 0,
1055 process_journal_block, &pb);
1056 if ((pb.last_block + 1) * ctx->fs->blocksize <
1057 (int) EXT2_I_SIZE(&j_inode->i_ext2)) {
1058 retval = EXT2_ET_JOURNAL_TOO_SMALL;
1059 goto try_backup_journal;
1060 }
1061 if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) {
1062 retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum,
1063 &j_inode->i_ext2);
1064 if (retval)
1065 goto errout;
1066 }
1067
1068 journal->j_total_len = EXT2_I_SIZE(&j_inode->i_ext2) /
1069 journal->j_blocksize;
1070
1071 #ifdef USE_INODE_IO
1072 retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum,
1073 &j_inode->i_ext2,
1074 &journal_name);
1075 if (retval)
1076 goto errout;
1077
1078 io_ptr = inode_io_manager;
1079 #else
1080 journal->j_inode = j_inode;
1081 ctx->journal_io = ctx->fs->io;
1082 if ((ret = jbd2_journal_bmap(journal, 0, &start)) != 0) {
1083 retval = (errcode_t) (-1 * ret);
1084 goto errout;
1085 }
1086 #endif
1087 } else {
1088 ext_journal = 1;
1089 if (!ctx->journal_name) {
1090 char uuid[37];
1091
1092 uuid_unparse(sb->s_journal_uuid, uuid);
1093 ctx->journal_name = blkid_get_devname(ctx->blkid,
1094 "UUID", uuid);
1095 if (!ctx->journal_name)
1096 ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev);
1097 }
1098 journal_name = ctx->journal_name;
1099
1100 if (!journal_name) {
1101 fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx);
1102 retval = EXT2_ET_LOAD_EXT_JOURNAL;
1103 goto errout;
1104 }
1105
1106 jfs_debug(1, "Using journal file %s\n", journal_name);
1107 io_ptr = unix_io_manager;
1108 }
1109
1110 #if 0
1111 test_io_backing_manager = io_ptr;
1112 io_ptr = test_io_manager;
1113 #endif
1114 #ifndef USE_INODE_IO
1115 if (ext_journal)
1116 #endif
1117 {
1118 int flags = IO_FLAG_RW;
1119 if (!(ctx->mount_flags & EXT2_MF_ISROOT &&
1120 ctx->mount_flags & EXT2_MF_READONLY))
1121 flags |= IO_FLAG_EXCLUSIVE;
1122 if ((ctx->mount_flags & EXT2_MF_READONLY) &&
1123 (ctx->options & E2F_OPT_FORCE))
1124 flags &= ~IO_FLAG_EXCLUSIVE;
1125
1126
1127 retval = io_ptr->open(journal_name, flags,
1128 &ctx->journal_io);
1129 }
1130 if (retval)
1131 goto errout;
1132
1133 io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize);
1134
1135 if (ext_journal) {
1136 blk64_t maxlen;
1137
1138 start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
1139 bh = getblk(dev_journal, start, ctx->fs->blocksize);
1140 if (!bh) {
1141 retval = EXT2_ET_NO_MEMORY;
1142 goto errout;
1143 }
1144 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1145 if ((retval = bh->b_err) != 0) {
1146 brelse(bh);
1147 goto errout;
1148 }
1149 memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET,
1150 sizeof(jsuper));
1151 #ifdef WORDS_BIGENDIAN
1152 if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
1153 ext2fs_swap_super(&jsuper);
1154 #endif
1155 if (jsuper.s_magic != EXT2_SUPER_MAGIC ||
1156 !ext2fs_has_feature_journal_dev(&jsuper)) {
1157 fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx);
1158 retval = EXT2_ET_LOAD_EXT_JOURNAL;
1159 brelse(bh);
1160 goto errout;
1161 }
1162 /* Make sure the journal UUID is correct */
1163 if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid,
1164 sizeof(jsuper.s_uuid))) {
1165 fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx);
1166 retval = EXT2_ET_LOAD_EXT_JOURNAL;
1167 brelse(bh);
1168 goto errout;
1169 }
1170
1171 /* Check the superblock checksum */
1172 if (ext2fs_has_feature_metadata_csum(&jsuper)) {
1173 struct struct_ext2_filsys fsx;
1174 struct ext2_super_block superx;
1175 void *p;
1176
1177 p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET;
1178 memcpy(&fsx, ctx->fs, sizeof(fsx));
1179 memcpy(&superx, ctx->fs->super, sizeof(superx));
1180 fsx.super = &superx;
1181 ext2fs_set_feature_metadata_csum(fsx.super);
1182 if (!ext2fs_superblock_csum_verify(&fsx, p) &&
1183 fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID,
1184 &pctx)) {
1185 ext2fs_superblock_csum_set(&fsx, p);
1186 mark_buffer_dirty(bh);
1187 }
1188 }
1189 brelse(bh);
1190
1191 maxlen = ext2fs_blocks_count(&jsuper);
1192 journal->j_total_len = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1;
1193 start++;
1194 }
1195
1196 if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) {
1197 retval = EXT2_ET_NO_MEMORY;
1198 goto errout;
1199 }
1200
1201 journal->j_sb_buffer = bh;
1202 journal->j_superblock = (journal_superblock_t *)bh->b_data;
1203 if (ext2fs_has_feature_fast_commit(ctx->fs->super))
1204 journal->j_fc_replay_callback = ext4_fc_replay;
1205 else
1206 journal->j_fc_replay_callback = NULL;
1207
1208 #ifdef USE_INODE_IO
1209 if (j_inode)
1210 ext2fs_free_mem(&j_inode);
1211 #endif
1212
1213 *ret_journal = journal;
1214 e2fsck_use_inode_shortcuts(ctx, 0);
1215 return 0;
1216
1217 errout:
1218 e2fsck_use_inode_shortcuts(ctx, 0);
1219 if (dev_fs)
1220 ext2fs_free_mem(&dev_fs);
1221 if (j_inode)
1222 ext2fs_free_mem(&j_inode);
1223 if (journal)
1224 ext2fs_free_mem(&journal);
1225 return retval;
1226 }
1227
e2fsck_journal_fix_bad_inode(e2fsck_t ctx,struct problem_context * pctx)1228 static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
1229 struct problem_context *pctx)
1230 {
1231 struct ext2_super_block *sb = ctx->fs->super;
1232 int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
1233 int has_journal = ext2fs_has_feature_journal(ctx->fs->super);
1234
1235 if (has_journal || sb->s_journal_inum) {
1236 /* The journal inode is bogus, remove and force full fsck */
1237 pctx->ino = sb->s_journal_inum;
1238 if (fix_problem(ctx, PR_0_JOURNAL_BAD_INODE, pctx)) {
1239 if (has_journal && sb->s_journal_inum)
1240 printf("*** journal has been deleted ***\n\n");
1241 ext2fs_clear_feature_journal(sb);
1242 sb->s_journal_inum = 0;
1243 memset(sb->s_jnl_blocks, 0, sizeof(sb->s_jnl_blocks));
1244 ctx->flags |= E2F_FLAG_JOURNAL_INODE;
1245 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1246 e2fsck_clear_recover(ctx, 1);
1247 return 0;
1248 }
1249 return EXT2_ET_CORRUPT_JOURNAL_SB;
1250 } else if (recover) {
1251 if (fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, pctx)) {
1252 e2fsck_clear_recover(ctx, 1);
1253 return 0;
1254 }
1255 return EXT2_ET_UNSUPP_FEATURE;
1256 }
1257 return 0;
1258 }
1259
1260 #define V1_SB_SIZE 0x0024
clear_v2_journal_fields(journal_t * journal)1261 static void clear_v2_journal_fields(journal_t *journal)
1262 {
1263 e2fsck_t ctx = journal->j_dev->k_ctx;
1264 struct problem_context pctx;
1265
1266 clear_problem_context(&pctx);
1267
1268 if (!fix_problem(ctx, PR_0_CLEAR_V2_JOURNAL, &pctx))
1269 return;
1270
1271 ctx->flags |= E2F_FLAG_PROBLEMS_FIXED;
1272 memset(((char *) journal->j_superblock) + V1_SB_SIZE, 0,
1273 ctx->fs->blocksize-V1_SB_SIZE);
1274 mark_buffer_dirty(journal->j_sb_buffer);
1275 }
1276
1277
e2fsck_journal_load(journal_t * journal)1278 static errcode_t e2fsck_journal_load(journal_t *journal)
1279 {
1280 e2fsck_t ctx = journal->j_dev->k_ctx;
1281 journal_superblock_t *jsb;
1282 struct buffer_head *jbh = journal->j_sb_buffer;
1283 struct problem_context pctx;
1284
1285 clear_problem_context(&pctx);
1286
1287 ll_rw_block(REQ_OP_READ, 0, 1, &jbh);
1288 if (jbh->b_err) {
1289 com_err(ctx->device_name, jbh->b_err, "%s",
1290 _("reading journal superblock\n"));
1291 return jbh->b_err;
1292 }
1293
1294 jsb = journal->j_superblock;
1295 /* If we don't even have JBD2_MAGIC, we probably have a wrong inode */
1296 if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER))
1297 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
1298
1299 switch (ntohl(jsb->s_header.h_blocktype)) {
1300 case JBD2_SUPERBLOCK_V1:
1301 journal->j_format_version = 1;
1302 if (jsb->s_feature_compat ||
1303 jsb->s_feature_incompat ||
1304 jsb->s_feature_ro_compat ||
1305 jsb->s_nr_users)
1306 clear_v2_journal_fields(journal);
1307 break;
1308
1309 case JBD2_SUPERBLOCK_V2:
1310 journal->j_format_version = 2;
1311 if (ntohl(jsb->s_nr_users) > 1 &&
1312 uuid_is_null(ctx->fs->super->s_journal_uuid))
1313 clear_v2_journal_fields(journal);
1314 if (ntohl(jsb->s_nr_users) > 1) {
1315 fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
1316 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
1317 }
1318 break;
1319
1320 /*
1321 * These should never appear in a journal super block, so if
1322 * they do, the journal is badly corrupted.
1323 */
1324 case JBD2_DESCRIPTOR_BLOCK:
1325 case JBD2_COMMIT_BLOCK:
1326 case JBD2_REVOKE_BLOCK:
1327 return EXT2_ET_CORRUPT_JOURNAL_SB;
1328
1329 /* If we don't understand the superblock major type, but there
1330 * is a magic number, then it is likely to be a new format we
1331 * just don't understand, so leave it alone. */
1332 default:
1333 return EXT2_ET_JOURNAL_UNSUPP_VERSION;
1334 }
1335
1336 if (JBD2_HAS_INCOMPAT_FEATURE(journal, ~JBD2_KNOWN_INCOMPAT_FEATURES))
1337 return EXT2_ET_UNSUPP_FEATURE;
1338
1339 if (JBD2_HAS_RO_COMPAT_FEATURE(journal, ~JBD2_KNOWN_ROCOMPAT_FEATURES))
1340 return EXT2_ET_RO_UNSUPP_FEATURE;
1341
1342 /* Checksum v1-3 are mutually exclusive features. */
1343 if (jbd2_has_feature_csum2(journal) && jbd2_has_feature_csum3(journal))
1344 return EXT2_ET_CORRUPT_JOURNAL_SB;
1345
1346 if (jbd2_journal_has_csum_v2or3(journal) &&
1347 jbd2_has_feature_checksum(journal))
1348 return EXT2_ET_CORRUPT_JOURNAL_SB;
1349
1350 if (!e2fsck_journal_verify_csum_type(journal, jsb) ||
1351 !e2fsck_journal_sb_csum_verify(journal, jsb))
1352 return EXT2_ET_CORRUPT_JOURNAL_SB;
1353
1354 if (jbd2_journal_has_csum_v2or3(journal))
1355 journal->j_csum_seed = jbd2_chksum(journal, ~0, jsb->s_uuid,
1356 sizeof(jsb->s_uuid));
1357
1358 /* We have now checked whether we know enough about the journal
1359 * format to be able to proceed safely, so any other checks that
1360 * fail we should attempt to recover from. */
1361 if (jsb->s_blocksize != htonl(journal->j_blocksize)) {
1362 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
1363 _("%s: no valid journal superblock found\n"),
1364 ctx->device_name);
1365 return EXT2_ET_CORRUPT_JOURNAL_SB;
1366 }
1367
1368 if (ntohl(jsb->s_maxlen) < journal->j_total_len)
1369 journal->j_total_len = ntohl(jsb->s_maxlen);
1370 else if (ntohl(jsb->s_maxlen) > journal->j_total_len) {
1371 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
1372 _("%s: journal too short\n"),
1373 ctx->device_name);
1374 return EXT2_ET_CORRUPT_JOURNAL_SB;
1375 }
1376
1377 journal->j_tail_sequence = ntohl(jsb->s_sequence);
1378 journal->j_transaction_sequence = journal->j_tail_sequence;
1379 journal->j_tail = ntohl(jsb->s_start);
1380 journal->j_first = ntohl(jsb->s_first);
1381 if (jbd2_has_feature_fast_commit(journal)) {
1382 if (ntohl(jsb->s_maxlen) - jbd2_journal_get_num_fc_blks(jsb)
1383 < JBD2_MIN_JOURNAL_BLOCKS) {
1384 com_err(ctx->program_name, EXT2_ET_CORRUPT_JOURNAL_SB,
1385 _("%s: incorrect fast commit blocks\n"),
1386 ctx->device_name);
1387 return EXT2_ET_CORRUPT_JOURNAL_SB;
1388 }
1389 journal->j_fc_last = ntohl(jsb->s_maxlen);
1390 journal->j_last = journal->j_fc_last -
1391 jbd2_journal_get_num_fc_blks(jsb);
1392 journal->j_fc_first = journal->j_last + 1;
1393 } else {
1394 journal->j_last = ntohl(jsb->s_maxlen);
1395 }
1396
1397 return 0;
1398 }
1399
e2fsck_journal_reset_super(e2fsck_t ctx,journal_superblock_t * jsb,journal_t * journal)1400 static void e2fsck_journal_reset_super(e2fsck_t ctx, journal_superblock_t *jsb,
1401 journal_t *journal)
1402 {
1403 char *p;
1404 union {
1405 uuid_t uuid;
1406 __u32 val[4];
1407 } u;
1408 __u32 new_seq = 0;
1409 int i;
1410
1411 /* Leave a valid existing V1 superblock signature alone.
1412 * Anything unrecognisable we overwrite with a new V2
1413 * signature. */
1414
1415 if (jsb->s_header.h_magic != htonl(JBD2_MAGIC_NUMBER) ||
1416 jsb->s_header.h_blocktype != htonl(JBD2_SUPERBLOCK_V1)) {
1417 jsb->s_header.h_magic = htonl(JBD2_MAGIC_NUMBER);
1418 jsb->s_header.h_blocktype = htonl(JBD2_SUPERBLOCK_V2);
1419 }
1420
1421 /* Zero out everything else beyond the superblock header */
1422
1423 p = ((char *) jsb) + sizeof(journal_header_t);
1424 memset (p, 0, ctx->fs->blocksize-sizeof(journal_header_t));
1425
1426 jsb->s_blocksize = htonl(ctx->fs->blocksize);
1427 jsb->s_maxlen = htonl(journal->j_total_len);
1428 jsb->s_first = htonl(1);
1429
1430 /* Initialize the journal sequence number so that there is "no"
1431 * chance we will find old "valid" transactions in the journal.
1432 * This avoids the need to zero the whole journal (slow to do,
1433 * and risky when we are just recovering the filesystem).
1434 */
1435 uuid_generate(u.uuid);
1436 for (i = 0; i < 4; i ++)
1437 new_seq ^= u.val[i];
1438 jsb->s_sequence = htonl(new_seq);
1439 e2fsck_journal_sb_csum_set(journal, jsb);
1440
1441 mark_buffer_dirty(journal->j_sb_buffer);
1442 ll_rw_block(REQ_OP_WRITE, 0, 1, &journal->j_sb_buffer);
1443 }
1444
e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,journal_t * journal,struct problem_context * pctx)1445 static errcode_t e2fsck_journal_fix_corrupt_super(e2fsck_t ctx,
1446 journal_t *journal,
1447 struct problem_context *pctx)
1448 {
1449 struct ext2_super_block *sb = ctx->fs->super;
1450 int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
1451
1452 if (ext2fs_has_feature_journal(sb)) {
1453 if (fix_problem(ctx, PR_0_JOURNAL_BAD_SUPER, pctx)) {
1454 e2fsck_journal_reset_super(ctx, journal->j_superblock,
1455 journal);
1456 journal->j_transaction_sequence = 1;
1457 e2fsck_clear_recover(ctx, recover);
1458 return 0;
1459 }
1460 return EXT2_ET_CORRUPT_JOURNAL_SB;
1461 } else if (e2fsck_journal_fix_bad_inode(ctx, pctx))
1462 return EXT2_ET_CORRUPT_JOURNAL_SB;
1463
1464 return 0;
1465 }
1466
e2fsck_journal_release(e2fsck_t ctx,journal_t * journal,int reset,int drop)1467 static void e2fsck_journal_release(e2fsck_t ctx, journal_t *journal,
1468 int reset, int drop)
1469 {
1470 journal_superblock_t *jsb;
1471
1472 if (drop)
1473 mark_buffer_clean(journal->j_sb_buffer);
1474 else if (!(ctx->options & E2F_OPT_READONLY)) {
1475 jsb = journal->j_superblock;
1476 jsb->s_sequence = htonl(journal->j_tail_sequence);
1477 if (reset)
1478 jsb->s_start = 0; /* this marks the journal as empty */
1479 e2fsck_journal_sb_csum_set(journal, jsb);
1480 mark_buffer_dirty(journal->j_sb_buffer);
1481 }
1482 brelse(journal->j_sb_buffer);
1483
1484 if (ctx->journal_io) {
1485 if (ctx->fs && ctx->fs->io != ctx->journal_io)
1486 io_channel_close(ctx->journal_io);
1487 ctx->journal_io = 0;
1488 }
1489
1490 #ifndef USE_INODE_IO
1491 if (journal->j_inode)
1492 ext2fs_free_mem(&journal->j_inode);
1493 #endif
1494 if (journal->j_fs_dev)
1495 ext2fs_free_mem(&journal->j_fs_dev);
1496 ext2fs_free_mem(&journal);
1497 }
1498
1499 /*
1500 * This function makes sure that the superblock fields regarding the
1501 * journal are consistent.
1502 */
e2fsck_check_ext3_journal(e2fsck_t ctx)1503 errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
1504 {
1505 struct ext2_super_block *sb = ctx->fs->super;
1506 journal_t *journal;
1507 int recover = ext2fs_has_feature_journal_needs_recovery(ctx->fs->super);
1508 struct problem_context pctx;
1509 problem_t problem;
1510 int reset = 0, force_fsck = 0;
1511 errcode_t retval;
1512
1513 /* If we don't have any journal features, don't do anything more */
1514 if (!ext2fs_has_feature_journal(sb) &&
1515 !recover && sb->s_journal_inum == 0 && sb->s_journal_dev == 0 &&
1516 uuid_is_null(sb->s_journal_uuid))
1517 return 0;
1518
1519 clear_problem_context(&pctx);
1520 pctx.num = sb->s_journal_inum;
1521
1522 retval = e2fsck_get_journal(ctx, &journal);
1523 if (retval) {
1524 if ((retval == EXT2_ET_BAD_INODE_NUM) ||
1525 (retval == EXT2_ET_BAD_BLOCK_NUM) ||
1526 (retval == EXT2_ET_JOURNAL_TOO_SMALL) ||
1527 (retval == EXT2_ET_NO_JOURNAL))
1528 return e2fsck_journal_fix_bad_inode(ctx, &pctx);
1529 return retval;
1530 }
1531
1532 retval = e2fsck_journal_load(journal);
1533 if (retval) {
1534 if ((retval == EXT2_ET_CORRUPT_JOURNAL_SB) ||
1535 ((retval == EXT2_ET_UNSUPP_FEATURE) &&
1536 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_INCOMPAT,
1537 &pctx))) ||
1538 ((retval == EXT2_ET_RO_UNSUPP_FEATURE) &&
1539 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_ROCOMPAT,
1540 &pctx))) ||
1541 ((retval == EXT2_ET_JOURNAL_UNSUPP_VERSION) &&
1542 (!fix_problem(ctx, PR_0_JOURNAL_UNSUPP_VERSION, &pctx))))
1543 retval = e2fsck_journal_fix_corrupt_super(ctx, journal,
1544 &pctx);
1545 e2fsck_journal_release(ctx, journal, 0, 1);
1546 return retval;
1547 }
1548
1549 /*
1550 * We want to make the flags consistent here. We will not leave with
1551 * needs_recovery set but has_journal clear. We can't get in a loop
1552 * with -y, -n, or -p, only if a user isn't making up their mind.
1553 */
1554 no_has_journal:
1555 if (!ext2fs_has_feature_journal(sb)) {
1556 recover = ext2fs_has_feature_journal_needs_recovery(sb);
1557 if (fix_problem(ctx, PR_0_JOURNAL_HAS_JOURNAL, &pctx)) {
1558 if (recover &&
1559 !fix_problem(ctx, PR_0_JOURNAL_RECOVER_SET, &pctx))
1560 goto no_has_journal;
1561 /*
1562 * Need a full fsck if we are releasing a
1563 * journal stored on a reserved inode.
1564 */
1565 force_fsck = recover ||
1566 (sb->s_journal_inum < EXT2_FIRST_INODE(sb));
1567 /* Clear all of the journal fields */
1568 sb->s_journal_inum = 0;
1569 sb->s_journal_dev = 0;
1570 memset(sb->s_journal_uuid, 0,
1571 sizeof(sb->s_journal_uuid));
1572 e2fsck_clear_recover(ctx, force_fsck);
1573 } else if (!(ctx->options & E2F_OPT_READONLY)) {
1574 ext2fs_set_feature_journal(sb);
1575 ctx->fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1576 ext2fs_mark_super_dirty(ctx->fs);
1577 }
1578 }
1579
1580 if (ext2fs_has_feature_journal(sb) &&
1581 !ext2fs_has_feature_journal_needs_recovery(sb) &&
1582 journal->j_superblock->s_start != 0) {
1583 /* Print status information */
1584 fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
1585 if (ctx->superblock)
1586 problem = PR_0_JOURNAL_RUN_DEFAULT;
1587 else
1588 problem = PR_0_JOURNAL_RUN;
1589 if (fix_problem(ctx, problem, &pctx)) {
1590 ctx->options |= E2F_OPT_FORCE;
1591 ext2fs_set_feature_journal_needs_recovery(sb);
1592 ext2fs_mark_super_dirty(ctx->fs);
1593 } else if (fix_problem(ctx,
1594 PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
1595 reset = 1;
1596 sb->s_state &= ~EXT2_VALID_FS;
1597 ext2fs_mark_super_dirty(ctx->fs);
1598 }
1599 /*
1600 * If the user answers no to the above question, we
1601 * ignore the fact that journal apparently has data;
1602 * accidentally replaying over valid data would be far
1603 * worse than skipping a questionable recovery.
1604 *
1605 * XXX should we abort with a fatal error here? What
1606 * will the ext3 kernel code do if a filesystem with
1607 * !NEEDS_RECOVERY but with a non-zero
1608 * journal->j_superblock->s_start is mounted?
1609 */
1610 }
1611
1612 /*
1613 * If we don't need to do replay the journal, check to see if
1614 * the journal's errno is set; if so, we need to mark the file
1615 * system as being corrupt and clear the journal's s_errno.
1616 */
1617 if (!ext2fs_has_feature_journal_needs_recovery(sb) &&
1618 journal->j_superblock->s_errno) {
1619 ctx->fs->super->s_state |= EXT2_ERROR_FS;
1620 ext2fs_mark_super_dirty(ctx->fs);
1621 journal->j_superblock->s_errno = 0;
1622 e2fsck_journal_sb_csum_set(journal, journal->j_superblock);
1623 mark_buffer_dirty(journal->j_sb_buffer);
1624 }
1625
1626 e2fsck_journal_release(ctx, journal, reset, 0);
1627 return retval;
1628 }
1629
recover_ext3_journal(e2fsck_t ctx)1630 static errcode_t recover_ext3_journal(e2fsck_t ctx)
1631 {
1632 struct problem_context pctx;
1633 journal_t *journal;
1634 errcode_t retval;
1635
1636 clear_problem_context(&pctx);
1637
1638 retval = jbd2_journal_init_revoke_record_cache();
1639 if (retval)
1640 return retval;
1641
1642 retval = jbd2_journal_init_revoke_table_cache();
1643 if (retval)
1644 return retval;
1645
1646 retval = e2fsck_get_journal(ctx, &journal);
1647 if (retval)
1648 return retval;
1649
1650 retval = e2fsck_journal_load(journal);
1651 if (retval)
1652 goto errout;
1653
1654 retval = jbd2_journal_init_revoke(journal, 1024);
1655 if (retval)
1656 goto errout;
1657
1658 retval = -jbd2_journal_recover(journal);
1659 if (retval)
1660 goto errout;
1661
1662 if (journal->j_failed_commit) {
1663 pctx.ino = journal->j_failed_commit;
1664 fix_problem(ctx, PR_0_JNL_TXN_CORRUPT, &pctx);
1665 journal->j_superblock->s_errno = -EINVAL;
1666 mark_buffer_dirty(journal->j_sb_buffer);
1667 }
1668
1669 journal->j_tail_sequence = journal->j_transaction_sequence;
1670
1671 errout:
1672 jbd2_journal_destroy_revoke(journal);
1673 jbd2_journal_destroy_revoke_record_cache();
1674 jbd2_journal_destroy_revoke_table_cache();
1675 e2fsck_journal_release(ctx, journal, 1, 0);
1676 return retval;
1677 }
1678
e2fsck_run_ext3_journal(e2fsck_t ctx)1679 errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
1680 {
1681 io_manager io_ptr = ctx->fs->io->manager;
1682 int blocksize = ctx->fs->blocksize;
1683 errcode_t retval, recover_retval;
1684 io_stats stats = 0;
1685 unsigned long long kbytes_written = 0;
1686
1687 printf(_("%s: recovering journal\n"), ctx->device_name);
1688 if (ctx->options & E2F_OPT_READONLY) {
1689 printf(_("%s: won't do journal recovery while read-only\n"),
1690 ctx->device_name);
1691 return EXT2_ET_FILE_RO;
1692 }
1693
1694 if (ctx->fs->flags & EXT2_FLAG_DIRTY)
1695 ext2fs_flush(ctx->fs); /* Force out any modifications */
1696
1697 recover_retval = recover_ext3_journal(ctx);
1698
1699 /*
1700 * Reload the filesystem context to get up-to-date data from disk
1701 * because journal recovery will change the filesystem under us.
1702 */
1703 if (ctx->fs->super->s_kbytes_written &&
1704 ctx->fs->io->manager->get_stats)
1705 ctx->fs->io->manager->get_stats(ctx->fs->io, &stats);
1706 if (stats && stats->bytes_written)
1707 kbytes_written = stats->bytes_written >> 10;
1708
1709 ext2fs_mmp_stop(ctx->fs);
1710 ext2fs_free(ctx->fs);
1711 retval = ext2fs_open(ctx->filesystem_name, ctx->openfs_flags,
1712 ctx->superblock, blocksize, io_ptr,
1713 &ctx->fs);
1714 if (retval) {
1715 com_err(ctx->program_name, retval,
1716 _("while trying to re-open %s"),
1717 ctx->device_name);
1718 fatal_error(ctx, 0);
1719 }
1720 ctx->fs->priv_data = ctx;
1721 ctx->fs->now = ctx->now;
1722 ctx->fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1723 ctx->fs->super->s_kbytes_written += kbytes_written;
1724
1725 /* Set the superblock flags */
1726 e2fsck_clear_recover(ctx, recover_retval != 0);
1727
1728 /*
1729 * Do one last sanity check, and propagate journal->s_errno to
1730 * the EXT2_ERROR_FS flag in the fs superblock if needed.
1731 */
1732 retval = e2fsck_check_ext3_journal(ctx);
1733 return retval ? retval : recover_retval;
1734 }
1735
1736 /*
1737 * This function will move the journal inode from a visible file in
1738 * the filesystem directory hierarchy to the reserved inode if necessary.
1739 */
1740 static const char * const journal_names[] = {
1741 ".journal", "journal", ".journal.dat", "journal.dat", 0 };
1742
e2fsck_move_ext3_journal(e2fsck_t ctx)1743 void e2fsck_move_ext3_journal(e2fsck_t ctx)
1744 {
1745 struct ext2_super_block *sb = ctx->fs->super;
1746 struct problem_context pctx;
1747 struct ext2_inode inode;
1748 ext2_filsys fs = ctx->fs;
1749 ext2_ino_t ino;
1750 errcode_t retval;
1751 const char * const * cpp;
1752 dgrp_t group;
1753 int mount_flags;
1754
1755 clear_problem_context(&pctx);
1756
1757 /*
1758 * If the filesystem is opened read-only, or there is no
1759 * journal, then do nothing.
1760 */
1761 if ((ctx->options & E2F_OPT_READONLY) ||
1762 (sb->s_journal_inum == 0) ||
1763 !ext2fs_has_feature_journal(sb))
1764 return;
1765
1766 /*
1767 * Read in the journal inode
1768 */
1769 if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
1770 return;
1771
1772 /*
1773 * If it's necessary to backup the journal inode, do so.
1774 */
1775 if ((sb->s_jnl_backup_type == 0) ||
1776 ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
1777 memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
1778 if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
1779 memcpy(sb->s_jnl_blocks, inode.i_block,
1780 EXT2_N_BLOCKS*4);
1781 sb->s_jnl_blocks[15] = inode.i_size_high;
1782 sb->s_jnl_blocks[16] = inode.i_size;
1783 sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
1784 ext2fs_mark_super_dirty(fs);
1785 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1786 }
1787 }
1788
1789 /*
1790 * If the journal is already the hidden inode, then do nothing
1791 */
1792 if (sb->s_journal_inum == EXT2_JOURNAL_INO)
1793 return;
1794
1795 /*
1796 * The journal inode had better have only one link and not be readable.
1797 */
1798 if (inode.i_links_count != 1)
1799 return;
1800
1801 /*
1802 * If the filesystem is mounted, or we can't tell whether
1803 * or not it's mounted, do nothing.
1804 */
1805 retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
1806 if (retval || (mount_flags & EXT2_MF_MOUNTED))
1807 return;
1808
1809 /*
1810 * If we can't find the name of the journal inode, then do
1811 * nothing.
1812 */
1813 for (cpp = journal_names; *cpp; cpp++) {
1814 retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
1815 strlen(*cpp), 0, &ino);
1816 if ((retval == 0) && (ino == sb->s_journal_inum))
1817 break;
1818 }
1819 if (*cpp == 0)
1820 return;
1821
1822 /* We need the inode bitmap to be loaded */
1823 retval = ext2fs_read_bitmaps(fs);
1824 if (retval)
1825 return;
1826
1827 pctx.str = *cpp;
1828 if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
1829 return;
1830
1831 /*
1832 * OK, we've done all the checks, let's actually move the
1833 * journal inode. Errors at this point mean we need to force
1834 * an ext2 filesystem check.
1835 */
1836 if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
1837 goto err_out;
1838 if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
1839 goto err_out;
1840 sb->s_journal_inum = EXT2_JOURNAL_INO;
1841 ext2fs_mark_super_dirty(fs);
1842 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1843 inode.i_links_count = 0;
1844 inode.i_dtime = ctx->now;
1845 if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
1846 goto err_out;
1847
1848 group = ext2fs_group_of_ino(fs, ino);
1849 ext2fs_unmark_inode_bitmap2(fs->inode_map, ino);
1850 ext2fs_mark_ib_dirty(fs);
1851 ext2fs_bg_free_inodes_count_set(fs, group, ext2fs_bg_free_inodes_count(fs, group) + 1);
1852 ext2fs_group_desc_csum_set(fs, group);
1853 fs->super->s_free_inodes_count++;
1854 return;
1855
1856 err_out:
1857 pctx.errcode = retval;
1858 fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
1859 fs->super->s_state &= ~EXT2_VALID_FS;
1860 ext2fs_mark_super_dirty(fs);
1861 return;
1862 }
1863
1864 /*
1865 * This function makes sure the superblock hint for the external
1866 * journal is correct.
1867 */
e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)1868 int e2fsck_fix_ext3_journal_hint(e2fsck_t ctx)
1869 {
1870 struct ext2_super_block *sb = ctx->fs->super;
1871 struct problem_context pctx;
1872 char uuid[37], *journal_name;
1873 struct stat st;
1874
1875 if (!ext2fs_has_feature_journal(sb) ||
1876 uuid_is_null(sb->s_journal_uuid))
1877 return 0;
1878
1879 uuid_unparse(sb->s_journal_uuid, uuid);
1880 journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid);
1881 if (!journal_name)
1882 return 0;
1883
1884 if (stat(journal_name, &st) < 0) {
1885 free(journal_name);
1886 return 0;
1887 }
1888
1889 if (st.st_rdev != sb->s_journal_dev) {
1890 clear_problem_context(&pctx);
1891 pctx.num = st.st_rdev;
1892 if (fix_problem(ctx, PR_0_EXTERNAL_JOURNAL_HINT, &pctx)) {
1893 sb->s_journal_dev = st.st_rdev;
1894 ext2fs_mark_super_dirty(ctx->fs);
1895 }
1896 }
1897
1898 free(journal_name);
1899 return 0;
1900 }
1901