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