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[thirdparty/e2fsprogs.git] / e2fsck / super.c
1 /*
2 * e2fsck.c - superblock checks
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #ifdef HAVE_ERRNO_H
14 #include <errno.h>
15 #endif
16
17 #ifndef EXT2_SKIP_UUID
18 #include "uuid/uuid.h"
19 #endif
20 #include "e2fsck.h"
21 #include "problem.h"
22
23 #define MIN_CHECK 1
24 #define MAX_CHECK 2
25 #define LOG2_CHECK 4
26
27 static void check_super_value(e2fsck_t ctx, const char *descr,
28 unsigned long value, int flags,
29 unsigned long min_val, unsigned long max_val)
30 {
31 struct problem_context pctx;
32
33 if ((flags & MIN_CHECK && value < min_val) ||
34 (flags & MAX_CHECK && value > max_val) ||
35 (flags & LOG2_CHECK && (value & (value - 1)) != 0)) {
36 clear_problem_context(&pctx);
37 pctx.num = value;
38 pctx.str = descr;
39 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
40 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
41 }
42 }
43
44 /*
45 * helper function to release an inode
46 */
47 struct process_block_struct {
48 e2fsck_t ctx;
49 char *buf;
50 struct problem_context *pctx;
51 int truncating;
52 int truncate_offset;
53 e2_blkcnt_t truncate_block;
54 int truncated_blocks;
55 int abort;
56 errcode_t errcode;
57 };
58
59 static int release_inode_block(ext2_filsys fs,
60 blk64_t *block_nr,
61 e2_blkcnt_t blockcnt,
62 blk64_t ref_blk EXT2FS_ATTR((unused)),
63 int ref_offset EXT2FS_ATTR((unused)),
64 void *priv_data)
65 {
66 struct process_block_struct *pb;
67 e2fsck_t ctx;
68 struct problem_context *pctx;
69 blk64_t blk = *block_nr;
70 int retval = 0;
71
72 pb = (struct process_block_struct *) priv_data;
73 ctx = pb->ctx;
74 pctx = pb->pctx;
75
76 pctx->blk = blk;
77 pctx->blkcount = blockcnt;
78
79 if (HOLE_BLKADDR(blk))
80 return 0;
81
82 if ((blk < fs->super->s_first_data_block) ||
83 (blk >= ext2fs_blocks_count(fs->super))) {
84 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
85 return_abort:
86 pb->abort = 1;
87 return BLOCK_ABORT;
88 }
89
90 if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) {
91 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
92 goto return_abort;
93 }
94
95 /*
96 * If we are deleting an orphan, then we leave the fields alone.
97 * If we are truncating an orphan, then update the inode fields
98 * and clean up any partial block data.
99 */
100 if (pb->truncating) {
101 /*
102 * We only remove indirect blocks if they are
103 * completely empty.
104 */
105 if (blockcnt < 0) {
106 int i, limit;
107 blk_t *bp;
108
109 pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
110 pb->buf);
111 if (pb->errcode)
112 goto return_abort;
113
114 limit = fs->blocksize >> 2;
115 for (i = 0, bp = (blk_t *) pb->buf;
116 i < limit; i++, bp++)
117 if (*bp)
118 return 0;
119 }
120 /*
121 * We don't remove direct blocks until we've reached
122 * the truncation block.
123 */
124 if (blockcnt >= 0 && blockcnt < pb->truncate_block)
125 return 0;
126 /*
127 * If part of the last block needs truncating, we do
128 * it here.
129 */
130 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
131 pb->errcode = io_channel_read_blk64(fs->io, blk, 1,
132 pb->buf);
133 if (pb->errcode)
134 goto return_abort;
135 memset(pb->buf + pb->truncate_offset, 0,
136 fs->blocksize - pb->truncate_offset);
137 pb->errcode = io_channel_write_blk64(fs->io, blk, 1,
138 pb->buf);
139 if (pb->errcode)
140 goto return_abort;
141 }
142 pb->truncated_blocks++;
143 *block_nr = 0;
144 retval |= BLOCK_CHANGED;
145 }
146
147 ext2fs_block_alloc_stats2(fs, blk, -1);
148 ctx->free_blocks++;
149 return retval;
150 }
151
152 /*
153 * This function releases an inode. Returns 1 if an inconsistency was
154 * found. If the inode has a link count, then it is being truncated and
155 * not deleted.
156 */
157 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
158 struct ext2_inode *inode, char *block_buf,
159 struct problem_context *pctx)
160 {
161 struct process_block_struct pb;
162 ext2_filsys fs = ctx->fs;
163 errcode_t retval;
164 __u32 count;
165
166 if (!ext2fs_inode_has_valid_blocks2(fs, inode))
167 return 0;
168
169 pb.buf = block_buf + 3 * ctx->fs->blocksize;
170 pb.ctx = ctx;
171 pb.abort = 0;
172 pb.errcode = 0;
173 pb.pctx = pctx;
174 if (inode->i_links_count) {
175 pb.truncating = 1;
176 pb.truncate_block = (e2_blkcnt_t)
177 ((EXT2_I_SIZE(inode) + fs->blocksize - 1) /
178 fs->blocksize);
179 pb.truncate_offset = inode->i_size % fs->blocksize;
180 } else {
181 pb.truncating = 0;
182 pb.truncate_block = 0;
183 pb.truncate_offset = 0;
184 }
185 pb.truncated_blocks = 0;
186 retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
187 block_buf, release_inode_block, &pb);
188 if (retval) {
189 com_err("release_inode_blocks", retval,
190 _("while calling ext2fs_block_iterate for inode %d"),
191 ino);
192 return 1;
193 }
194 if (pb.abort)
195 return 1;
196
197 /* Refresh the inode since ext2fs_block_iterate may have changed it */
198 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
199
200 if (pb.truncated_blocks)
201 ext2fs_iblk_sub_blocks(fs, inode, pb.truncated_blocks);
202
203 if (ext2fs_file_acl_block(fs, inode)) {
204 retval = ext2fs_adjust_ea_refcount3(fs,
205 ext2fs_file_acl_block(fs, inode),
206 block_buf, -1, &count, ino);
207 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
208 retval = 0;
209 count = 1;
210 }
211 if (retval) {
212 com_err("release_inode_blocks", retval,
213 _("while calling ext2fs_adjust_ea_refcount2 for inode %d"),
214 ino);
215 return 1;
216 }
217 if (count == 0) {
218 ext2fs_block_alloc_stats2(fs,
219 ext2fs_file_acl_block(fs, inode), -1);
220 ctx->free_blocks++;
221 }
222 ext2fs_file_acl_block_set(fs, inode, 0);
223 }
224 return 0;
225 }
226
227 /*
228 * This function releases all of the orphan inodes. It returns 1 if
229 * it hit some error, and 0 on success.
230 */
231 static int release_orphan_inodes(e2fsck_t ctx)
232 {
233 ext2_filsys fs = ctx->fs;
234 ext2_ino_t ino, next_ino;
235 struct ext2_inode inode;
236 struct problem_context pctx;
237 char *block_buf;
238
239 if ((ino = fs->super->s_last_orphan) == 0)
240 return 0;
241
242 /*
243 * Win or lose, we won't be using the head of the orphan inode
244 * list again.
245 */
246 fs->super->s_last_orphan = 0;
247 ext2fs_mark_super_dirty(fs);
248
249 /*
250 * If the filesystem contains errors, don't run the orphan
251 * list, since the orphan list can't be trusted; and we're
252 * going to be running a full e2fsck run anyway...
253 */
254 if (fs->super->s_state & EXT2_ERROR_FS)
255 return 0;
256
257 if ((ino < EXT2_FIRST_INODE(fs->super)) ||
258 (ino > fs->super->s_inodes_count)) {
259 clear_problem_context(&pctx);
260 pctx.ino = ino;
261 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
262 return 1;
263 }
264
265 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
266 "block iterate buffer");
267 e2fsck_read_bitmaps(ctx);
268
269 while (ino) {
270 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
271 clear_problem_context(&pctx);
272 pctx.ino = ino;
273 pctx.inode = &inode;
274 pctx.str = inode.i_links_count ? _("Truncating") :
275 _("Clearing");
276
277 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
278
279 next_ino = inode.i_dtime;
280 if (next_ino &&
281 ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
282 (next_ino > fs->super->s_inodes_count))) {
283 pctx.ino = next_ino;
284 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
285 goto return_abort;
286 }
287
288 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
289 goto return_abort;
290
291 if (!inode.i_links_count) {
292 ext2fs_inode_alloc_stats2(fs, ino, -1,
293 LINUX_S_ISDIR(inode.i_mode));
294 ctx->free_inodes++;
295 inode.i_dtime = ctx->now;
296 } else {
297 inode.i_dtime = 0;
298 }
299 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
300 ino = next_ino;
301 }
302 ext2fs_free_mem(&block_buf);
303 return 0;
304 return_abort:
305 ext2fs_free_mem(&block_buf);
306 return 1;
307 }
308
309 /*
310 * Check the resize inode to make sure it is sane. We check both for
311 * the case where on-line resizing is not enabled (in which case the
312 * resize inode should be cleared) as well as the case where on-line
313 * resizing is enabled.
314 */
315 void check_resize_inode(e2fsck_t ctx)
316 {
317 ext2_filsys fs = ctx->fs;
318 struct ext2_inode inode;
319 struct problem_context pctx;
320 int i, gdt_off, ind_off;
321 dgrp_t j;
322 blk_t blk, pblk;
323 blk_t expect; /* for resize inode, which is 32-bit only */
324 __u32 *dind_buf = 0, *ind_buf;
325 errcode_t retval;
326
327 clear_problem_context(&pctx);
328
329 /*
330 * If the resize inode feature isn't set, then
331 * s_reserved_gdt_blocks must be zero.
332 */
333 if (!(fs->super->s_feature_compat &
334 EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
335 if (fs->super->s_reserved_gdt_blocks) {
336 pctx.num = fs->super->s_reserved_gdt_blocks;
337 if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS,
338 &pctx)) {
339 fs->super->s_reserved_gdt_blocks = 0;
340 ext2fs_mark_super_dirty(fs);
341 }
342 }
343 }
344
345 /* Read the resize inode */
346 pctx.ino = EXT2_RESIZE_INO;
347 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
348 if (retval) {
349 if (fs->super->s_feature_compat &
350 EXT2_FEATURE_COMPAT_RESIZE_INODE)
351 ctx->flags |= E2F_FLAG_RESIZE_INODE;
352 return;
353 }
354
355 /*
356 * If the resize inode feature isn't set, check to make sure
357 * the resize inode is cleared; then we're done.
358 */
359 if (!(fs->super->s_feature_compat &
360 EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
361 for (i=0; i < EXT2_N_BLOCKS; i++) {
362 if (inode.i_block[i])
363 break;
364 }
365 if ((i < EXT2_N_BLOCKS) &&
366 fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) {
367 memset(&inode, 0, sizeof(inode));
368 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
369 "clear_resize");
370 }
371 return;
372 }
373
374 /*
375 * The resize inode feature is enabled; check to make sure the
376 * only block in use is the double indirect block
377 */
378 blk = inode.i_block[EXT2_DIND_BLOCK];
379 for (i=0; i < EXT2_N_BLOCKS; i++) {
380 if (i != EXT2_DIND_BLOCK && inode.i_block[i])
381 break;
382 }
383 if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count ||
384 !(inode.i_mode & LINUX_S_IFREG) ||
385 (blk < fs->super->s_first_data_block ||
386 blk >= ext2fs_blocks_count(fs->super))) {
387 resize_inode_invalid:
388 if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) {
389 memset(&inode, 0, sizeof(inode));
390 e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode,
391 "clear_resize");
392 ctx->flags |= E2F_FLAG_RESIZE_INODE;
393 }
394 if (!(ctx->options & E2F_OPT_READONLY)) {
395 fs->super->s_state &= ~EXT2_VALID_FS;
396 ext2fs_mark_super_dirty(fs);
397 }
398 goto cleanup;
399 }
400 dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2,
401 "resize dind buffer");
402 ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize);
403
404 retval = ext2fs_read_ind_block(fs, blk, dind_buf);
405 if (retval)
406 goto resize_inode_invalid;
407
408 gdt_off = fs->desc_blocks;
409 pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks;
410 if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0)
411 pblk++; /* Deal with 1024 blocksize bigalloc fs */
412 for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4;
413 i++, gdt_off++, pblk++) {
414 gdt_off %= fs->blocksize/4;
415 if (dind_buf[gdt_off] != pblk)
416 goto resize_inode_invalid;
417 retval = ext2fs_read_ind_block(fs, pblk, ind_buf);
418 if (retval)
419 goto resize_inode_invalid;
420 ind_off = 0;
421 for (j = 1; j < fs->group_desc_count; j++) {
422 if (!ext2fs_bg_has_super(fs, j))
423 continue;
424 expect = pblk + EXT2_GROUPS_TO_BLOCKS(fs->super, j);
425 if (ind_buf[ind_off] != expect)
426 goto resize_inode_invalid;
427 ind_off++;
428 }
429 }
430
431 cleanup:
432 if (dind_buf)
433 ext2fs_free_mem(&dind_buf);
434
435 }
436
437 /*
438 * This function checks the dirhash signed/unsigned hint if necessary.
439 */
440 static void e2fsck_fix_dirhash_hint(e2fsck_t ctx)
441 {
442 struct ext2_super_block *sb = ctx->fs->super;
443 struct problem_context pctx;
444 char c;
445
446 if ((ctx->options & E2F_OPT_READONLY) ||
447 !(sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
448 (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH)))
449 return;
450
451 c = (char) 255;
452
453 clear_problem_context(&pctx);
454 if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) {
455 if (((int) c) == -1) {
456 sb->s_flags |= EXT2_FLAGS_SIGNED_HASH;
457 } else {
458 sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
459 }
460 ext2fs_mark_super_dirty(ctx->fs);
461 }
462 }
463
464
465 void check_super_block(e2fsck_t ctx)
466 {
467 ext2_filsys fs = ctx->fs;
468 blk64_t first_block, last_block;
469 struct ext2_super_block *sb = fs->super;
470 unsigned int ipg_max;
471 problem_t problem;
472 blk64_t blocks_per_group = fs->super->s_blocks_per_group;
473 __u32 bpg_max, cpg_max;
474 int inodes_per_block;
475 int inode_size;
476 int accept_time_fudge;
477 int broken_system_clock;
478 dgrp_t i;
479 blk64_t should_be;
480 struct problem_context pctx;
481 blk64_t free_blocks = 0;
482 ino_t free_inodes = 0;
483 int csum_flag, clear_test_fs_flag;
484
485 inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
486 ipg_max = inodes_per_block * (blocks_per_group - 4);
487 if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
488 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
489 cpg_max = 8 * EXT2_BLOCK_SIZE(sb);
490 if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb))
491 cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb);
492 bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs);
493 if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
494 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
495
496 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
497 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
498 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
499 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
500 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
501 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
502
503 clear_problem_context(&pctx);
504
505 /*
506 * Verify the super block constants...
507 */
508 check_super_value(ctx, "inodes_count", sb->s_inodes_count,
509 MIN_CHECK, 1, 0);
510 check_super_value(ctx, "blocks_count", ext2fs_blocks_count(sb),
511 MIN_CHECK, 1, 0);
512 check_super_value(ctx, "first_data_block", sb->s_first_data_block,
513 MAX_CHECK, 0, ext2fs_blocks_count(sb));
514 check_super_value(ctx, "log_block_size", sb->s_log_block_size,
515 MIN_CHECK | MAX_CHECK, 0,
516 EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
517 check_super_value(ctx, "log_cluster_size",
518 sb->s_log_cluster_size,
519 MIN_CHECK | MAX_CHECK, sb->s_log_block_size,
520 (EXT2_MAX_CLUSTER_LOG_SIZE -
521 EXT2_MIN_CLUSTER_LOG_SIZE));
522 check_super_value(ctx, "clusters_per_group", sb->s_clusters_per_group,
523 MIN_CHECK | MAX_CHECK, 8, cpg_max);
524 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
525 MIN_CHECK | MAX_CHECK, 8, bpg_max);
526 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
527 MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
528 check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb),
529 MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2);
530 check_super_value(ctx, "reserved_gdt_blocks",
531 sb->s_reserved_gdt_blocks, MAX_CHECK, 0,
532 fs->blocksize / sizeof(__u32));
533 check_super_value(ctx, "desc_size",
534 sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0,
535 EXT2_MAX_DESC_SIZE);
536 if (sb->s_rev_level > EXT2_GOOD_OLD_REV)
537 check_super_value(ctx, "first_ino", sb->s_first_ino,
538 MIN_CHECK | MAX_CHECK,
539 EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count);
540 inode_size = EXT2_INODE_SIZE(sb);
541 check_super_value(ctx, "inode_size",
542 inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK,
543 EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize);
544 if (sb->s_blocks_per_group != (sb->s_clusters_per_group *
545 EXT2FS_CLUSTER_RATIO(fs))) {
546 pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs);
547 pctx.str = "block_size";
548 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
549 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
550 return;
551 }
552
553 if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) &&
554 (ctx->num_blocks < ext2fs_blocks_count(sb))) {
555 pctx.blk = ext2fs_blocks_count(sb);
556 pctx.blk2 = ctx->num_blocks;
557 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
558 ctx->flags |= E2F_FLAG_ABORT;
559 return;
560 }
561 }
562
563 should_be = (sb->s_log_block_size == 0 &&
564 EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0;
565 if (sb->s_first_data_block != should_be) {
566 pctx.blk = sb->s_first_data_block;
567 pctx.blk2 = should_be;
568 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
569 ctx->flags |= E2F_FLAG_ABORT;
570 return;
571 }
572
573 should_be = (blk64_t)sb->s_inodes_per_group * fs->group_desc_count;
574 if (should_be > UINT_MAX)
575 should_be = UINT_MAX;
576 if (sb->s_inodes_count != should_be) {
577 pctx.ino = sb->s_inodes_count;
578 pctx.ino2 = should_be;
579 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
580 sb->s_inodes_count = should_be;
581 ext2fs_mark_super_dirty(fs);
582 }
583 }
584
585 /* Are metadata_csum and uninit_bg both set? */
586 if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
587 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
588 EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
589 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
590 fix_problem(ctx, PR_0_META_AND_GDT_CSUM_SET, &pctx)) {
591 fs->super->s_feature_ro_compat &=
592 ~EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
593 ext2fs_mark_super_dirty(fs);
594 for (i = 0; i < fs->group_desc_count; i++)
595 ext2fs_group_desc_csum_set(fs, i);
596 }
597
598 /* Is 64bit set and extents unset? */
599 if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
600 EXT4_FEATURE_INCOMPAT_64BIT) &&
601 !EXT2_HAS_INCOMPAT_FEATURE(fs->super,
602 EXT3_FEATURE_INCOMPAT_EXTENTS) &&
603 fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) {
604 fs->super->s_feature_incompat |=
605 EXT3_FEATURE_INCOMPAT_EXTENTS;
606 ext2fs_mark_super_dirty(fs);
607 }
608
609 if ((fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
610 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
611 pctx.group = fs->desc_blocks;
612 pctx.num = fs->super->s_first_meta_bg;
613 if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) {
614 fs->super->s_feature_incompat &=
615 ~EXT2_FEATURE_INCOMPAT_META_BG;
616 fs->super->s_first_meta_bg = 0;
617 ext2fs_mark_super_dirty(fs);
618 }
619 }
620
621 /*
622 * Verify the group descriptors....
623 */
624 first_block = sb->s_first_data_block;
625 last_block = ext2fs_blocks_count(sb)-1;
626
627 csum_flag = ext2fs_has_group_desc_csum(fs);
628 for (i = 0; i < fs->group_desc_count; i++) {
629 pctx.group = i;
630
631 if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super,
632 EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
633 first_block = ext2fs_group_first_block2(fs, i);
634 last_block = ext2fs_group_last_block2(fs, i);
635 }
636
637 if ((ext2fs_block_bitmap_loc(fs, i) < first_block) ||
638 (ext2fs_block_bitmap_loc(fs, i) > last_block)) {
639 pctx.blk = ext2fs_block_bitmap_loc(fs, i);
640 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
641 ext2fs_block_bitmap_loc_set(fs, i, 0);
642 }
643 if (ext2fs_block_bitmap_loc(fs, i) == 0) {
644 ctx->invalid_block_bitmap_flag[i]++;
645 ctx->invalid_bitmaps++;
646 }
647 if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) ||
648 (ext2fs_inode_bitmap_loc(fs, i) > last_block)) {
649 pctx.blk = ext2fs_inode_bitmap_loc(fs, i);
650 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
651 ext2fs_inode_bitmap_loc_set(fs, i, 0);
652 }
653 if (ext2fs_inode_bitmap_loc(fs, i) == 0) {
654 ctx->invalid_inode_bitmap_flag[i]++;
655 ctx->invalid_bitmaps++;
656 }
657 if ((ext2fs_inode_table_loc(fs, i) < first_block) ||
658 ((ext2fs_inode_table_loc(fs, i) +
659 fs->inode_blocks_per_group - 1) > last_block)) {
660 pctx.blk = ext2fs_inode_table_loc(fs, i);
661 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
662 ext2fs_inode_table_loc_set(fs, i, 0);
663 }
664 if (ext2fs_inode_table_loc(fs, i) == 0) {
665 ctx->invalid_inode_table_flag[i]++;
666 ctx->invalid_bitmaps++;
667 }
668 free_blocks += ext2fs_bg_free_blocks_count(fs, i);
669 free_inodes += ext2fs_bg_free_inodes_count(fs, i);
670
671 if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) ||
672 (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) ||
673 (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group))
674 ext2fs_unmark_valid(fs);
675
676 should_be = 0;
677 if (!ext2fs_group_desc_csum_verify(fs, i)) {
678 pctx.csum1 = ext2fs_bg_checksum(fs, i);
679 pctx.csum2 = ext2fs_group_desc_csum(fs, i);
680 if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) {
681 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
682 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
683 ext2fs_bg_itable_unused_set(fs, i, 0);
684 should_be = 1;
685 }
686 ext2fs_unmark_valid(fs);
687 }
688
689 if (!csum_flag &&
690 (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) ||
691 ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) ||
692 ext2fs_bg_itable_unused(fs, i) != 0)) {
693 if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) {
694 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
695 ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT);
696 ext2fs_bg_itable_unused_set(fs, i, 0);
697 should_be = 1;
698 }
699 ext2fs_unmark_valid(fs);
700 }
701
702 if (i == fs->group_desc_count - 1 &&
703 ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) {
704 if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) {
705 ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT);
706 should_be = 1;
707 }
708 ext2fs_unmark_valid(fs);
709 }
710
711 if (csum_flag &&
712 (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) ||
713 ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) {
714 pctx.blk = ext2fs_bg_itable_unused(fs, i);
715 if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) {
716 ext2fs_bg_itable_unused_set(fs, i, 0);
717 should_be = 1;
718 }
719 ext2fs_unmark_valid(fs);
720 }
721
722 if (should_be)
723 ext2fs_group_desc_csum_set(fs, i);
724 /* If the user aborts e2fsck by typing ^C, stop right away */
725 if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
726 return;
727 }
728
729 ctx->free_blocks = EXT2FS_C2B(fs, free_blocks);
730 ctx->free_inodes = free_inodes;
731
732 if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) ||
733 (sb->s_free_inodes_count > sb->s_inodes_count))
734 ext2fs_unmark_valid(fs);
735
736
737 /*
738 * If we have invalid bitmaps, set the error state of the
739 * filesystem.
740 */
741 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
742 sb->s_state &= ~EXT2_VALID_FS;
743 ext2fs_mark_super_dirty(fs);
744 }
745
746 clear_problem_context(&pctx);
747
748 #ifndef EXT2_SKIP_UUID
749 /*
750 * If the UUID field isn't assigned, assign it.
751 * Skip if checksums are enabled and the filesystem is mounted,
752 * if the id changes under the kernel remounting rw may fail.
753 */
754 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid) &&
755 (!csum_flag || !(ctx->mount_flags & EXT2_MF_MOUNTED))) {
756 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
757 uuid_generate(sb->s_uuid);
758 ext2fs_init_csum_seed(fs);
759 fs->flags |= EXT2_FLAG_DIRTY;
760 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
761 }
762 }
763 #endif
764
765 /*
766 * Check to see if we should disable the test_fs flag
767 */
768 profile_get_boolean(ctx->profile, "options",
769 "clear_test_fs_flag", 0, 1,
770 &clear_test_fs_flag);
771 if (!(ctx->options & E2F_OPT_READONLY) &&
772 clear_test_fs_flag &&
773 (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) &&
774 (fs_proc_check("ext4") || check_for_modules("ext4"))) {
775 if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) {
776 fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS;
777 fs->flags |= EXT2_FLAG_DIRTY;
778 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
779 }
780 }
781
782 /*
783 * For the Hurd, check to see if the filetype option is set,
784 * since it doesn't support it.
785 */
786 if (!(ctx->options & E2F_OPT_READONLY) &&
787 fs->super->s_creator_os == EXT2_OS_HURD &&
788 (fs->super->s_feature_incompat &
789 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
790 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
791 fs->super->s_feature_incompat &=
792 ~EXT2_FEATURE_INCOMPAT_FILETYPE;
793 ext2fs_mark_super_dirty(fs);
794 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
795 }
796 }
797
798 /*
799 * If we have any of the compatibility flags set, we need to have a
800 * revision 1 filesystem. Most kernels will not check the flags on
801 * a rev 0 filesystem and we may have corruption issues because of
802 * the incompatible changes to the filesystem.
803 */
804 if (!(ctx->options & E2F_OPT_READONLY) &&
805 fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
806 (fs->super->s_feature_compat ||
807 fs->super->s_feature_ro_compat ||
808 fs->super->s_feature_incompat) &&
809 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
810 ext2fs_update_dynamic_rev(fs);
811 ext2fs_mark_super_dirty(fs);
812 fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
813 }
814
815 /*
816 * Clean up any orphan inodes, if present.
817 */
818 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
819 fs->super->s_state &= ~EXT2_VALID_FS;
820 ext2fs_mark_super_dirty(fs);
821 }
822
823 /*
824 * Unfortunately, due to Windows' unfortunate design decision
825 * to configure the hardware clock to tick localtime, instead
826 * of the more proper and less error-prone UTC time, many
827 * users end up in the situation where the system clock is
828 * incorrectly set at the time when e2fsck is run.
829 *
830 * Historically this was usually due to some distributions
831 * having buggy init scripts and/or installers that didn't
832 * correctly detect this case and take appropriate
833 * countermeasures. However, it's still possible, despite the
834 * best efforts of init script and installer authors to not be
835 * able to detect this misconfiguration, usually due to a
836 * buggy or misconfigured virtualization manager or the
837 * installer not having access to a network time server during
838 * the installation process. So by default, we allow the
839 * superblock times to be fudged by up to 24 hours. This can
840 * be disabled by setting options.accept_time_fudge to the
841 * boolean value of false in e2fsck.conf. We also support
842 * options.buggy_init_scripts for backwards compatibility.
843 */
844 profile_get_boolean(ctx->profile, "options", "accept_time_fudge",
845 0, 1, &accept_time_fudge);
846 profile_get_boolean(ctx->profile, "options", "buggy_init_scripts",
847 0, accept_time_fudge, &accept_time_fudge);
848 ctx->time_fudge = accept_time_fudge ? 86400 : 0;
849
850 profile_get_boolean(ctx->profile, "options", "broken_system_clock",
851 0, 0, &broken_system_clock);
852
853 /*
854 * Check to see if the superblock last mount time or last
855 * write time is in the future.
856 */
857 if (!broken_system_clock &&
858 !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
859 fs->super->s_mtime > (__u32) ctx->now) {
860 pctx.num = fs->super->s_mtime;
861 problem = PR_0_FUTURE_SB_LAST_MOUNT;
862 if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge)
863 problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED;
864 if (fix_problem(ctx, problem, &pctx)) {
865 fs->super->s_mtime = ctx->now;
866 fs->flags |= EXT2_FLAG_DIRTY;
867 }
868 }
869 if (!broken_system_clock &&
870 !(ctx->flags & E2F_FLAG_TIME_INSANE) &&
871 fs->super->s_wtime > (__u32) ctx->now) {
872 pctx.num = fs->super->s_wtime;
873 problem = PR_0_FUTURE_SB_LAST_WRITE;
874 if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge)
875 problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED;
876 if (fix_problem(ctx, problem, &pctx)) {
877 fs->super->s_wtime = ctx->now;
878 fs->flags |= EXT2_FLAG_DIRTY;
879 }
880 }
881
882 /*
883 * Move the ext3 journal file, if necessary.
884 */
885 e2fsck_move_ext3_journal(ctx);
886
887 /*
888 * Fix journal hint, if necessary
889 */
890 e2fsck_fix_ext3_journal_hint(ctx);
891
892 /*
893 * Add dirhash hint if necessary
894 */
895 e2fsck_fix_dirhash_hint(ctx);
896
897 /*
898 * Hide quota inodes if necessary.
899 */
900 e2fsck_hide_quota(ctx);
901
902 return;
903 }
904
905 /*
906 * Check to see if we should backup the master sb to the backup super
907 * blocks. Returns non-zero if the sb should be backed up.
908 */
909
910 /*
911 * A few flags are set on the fly by the kernel, but only in the
912 * primary superblock. This is actually a bad thing, and we should
913 * try to discourage it in the future. In particular, for the newer
914 * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and
915 * EXT3_FEATURE_INCOMPAT_EXTENTS. So some of these may go away in the
916 * future. EXT3_FEATURE_INCOMPAT_RECOVER may also get set when
917 * copying the primary superblock during online resize.
918 *
919 * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but
920 * unfortunately, we shouldn't ignore it since if it's not set in the
921 * backup, the extended attributes in the filesystem will be stripped
922 * away.
923 */
924 #define FEATURE_RO_COMPAT_IGNORE (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
925 EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
926 #define FEATURE_INCOMPAT_IGNORE (EXT3_FEATURE_INCOMPAT_EXTENTS| \
927 EXT3_FEATURE_INCOMPAT_RECOVER)
928
929 int check_backup_super_block(e2fsck_t ctx)
930 {
931 ext2_filsys fs = ctx->fs;
932 errcode_t retval;
933 dgrp_t g;
934 blk64_t sb;
935 int ret = 0;
936 char buf[SUPERBLOCK_SIZE];
937 struct ext2_super_block *backup_sb;
938
939 /*
940 * If we are already writing out the backup blocks, then we
941 * don't need to test. Also, if the filesystem is invalid, or
942 * the check was aborted or cancelled, we also don't want to
943 * do the backup. If the filesystem was opened read-only then
944 * we can't do the backup.
945 */
946 if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) ||
947 !ext2fs_test_valid(fs) ||
948 (fs->super->s_state & EXT2_ERROR_FS) ||
949 (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) ||
950 (ctx->options & E2F_OPT_READONLY))
951 return 0;
952
953 for (g = 1; g < fs->group_desc_count; g++) {
954 if (!ext2fs_bg_has_super(fs, g))
955 continue;
956
957 sb = ext2fs_group_first_block2(fs, g);
958
959 retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE,
960 buf);
961 if (retval)
962 continue;
963 backup_sb = (struct ext2_super_block *) buf;
964 #ifdef WORDS_BIGENDIAN
965 ext2fs_swap_super(backup_sb);
966 #endif
967 if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) ||
968 (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) ||
969 ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) >
970 EXT2_MAX_BLOCK_LOG_SIZE) ||
971 (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE))
972 continue;
973
974 #define SUPER_INCOMPAT_DIFFERENT(x) \
975 ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) != \
976 (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE))
977 #define SUPER_RO_COMPAT_DIFFERENT(x) \
978 ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \
979 (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE))
980 #define SUPER_DIFFERENT(x) \
981 (fs->super->x != backup_sb->x)
982
983 if (SUPER_DIFFERENT(s_feature_compat) ||
984 SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
985 SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
986 SUPER_DIFFERENT(s_blocks_count) ||
987 SUPER_DIFFERENT(s_blocks_count_hi) ||
988 SUPER_DIFFERENT(s_inodes_count) ||
989 memcmp(fs->super->s_uuid, backup_sb->s_uuid,
990 sizeof(fs->super->s_uuid)))
991 ret = 1;
992 break;
993 }
994 return ret;
995 }
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