2 * e2fsck.c - superblock checks
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
16 #ifndef EXT2_SKIP_UUID
17 #include "uuid/uuid.h"
25 static void check_super_value(e2fsck_t ctx, const char *descr,
26 unsigned long value, int flags,
27 unsigned long min_val, unsigned long max_val)
29 struct problem_context pctx;
31 if (((flags & MIN_CHECK) && (value < min_val)) ||
32 ((flags & MAX_CHECK) && (value > max_val))) {
33 clear_problem_context(&pctx);
36 fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
37 ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
42 * This routine may get stubbed out in special compilations of the
45 #ifndef EXT2_SPECIAL_DEVICE_SIZE
46 errcode_t e2fsck_get_device_size(e2fsck_t ctx)
48 return (ext2fs_get_device_size(ctx->filesystem_name,
49 EXT2_BLOCK_SIZE(ctx->fs->super),
55 * helper function to release an inode
57 struct process_block_struct {
60 struct problem_context *pctx;
69 static int release_inode_block(ext2_filsys fs,
74 struct process_block_struct *pb;
76 struct problem_context *pctx;
77 blk_t blk = *block_nr;
80 pb = (struct process_block_struct *) priv_data;
85 pctx->blkcount = blockcnt;
87 if (HOLE_BLKADDR(blk))
90 if ((blk < fs->super->s_first_data_block) ||
91 (blk >= fs->super->s_blocks_count)) {
92 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx);
98 if (!ext2fs_test_block_bitmap(fs->block_map, blk)) {
99 fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx);
104 * If we are deleting an orphan, then we leave the fields alone.
105 * If we are truncating an orphan, then update the inode fields
106 * and clean up any partial block data.
108 if (pb->truncating) {
110 * We only remove indirect blocks if they are
117 pb->errcode = io_channel_read_blk(fs->io, blk, 1,
122 limit = fs->blocksize >> 2;
123 for (i = 0, bp = (blk_t *) pb->buf;
124 i < limit; i++, bp++)
129 * We don't remove direct blocks until we've reached
130 * the truncation block.
132 if (blockcnt >= 0 && blockcnt < pb->truncate_block)
135 * If part of the last block needs truncating, we do
138 if ((blockcnt == pb->truncate_block) && pb->truncate_offset) {
139 pb->errcode = io_channel_read_blk(fs->io, blk, 1,
143 memset(pb->buf + pb->truncate_offset, 0,
144 fs->blocksize - pb->truncate_offset);
145 pb->errcode = io_channel_write_blk(fs->io, blk, 1,
150 pb->truncated_blocks++;
152 retval |= BLOCK_CHANGED;
155 ext2fs_block_alloc_stats(fs, blk, -1);
160 * This function releases an inode. Returns 1 if an inconsistency was
161 * found. If the inode has a link count, then it is being truncated and
164 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
165 struct ext2_inode *inode, char *block_buf,
166 struct problem_context *pctx)
168 struct process_block_struct pb;
169 ext2_filsys fs = ctx->fs;
173 if (!ext2fs_inode_has_valid_blocks(inode))
176 pb.buf = block_buf + 3 * ctx->fs->blocksize;
181 if (inode->i_links_count) {
183 pb.truncate_block = (blk_t)
184 ((((long long)inode->i_size_high << 32) +
185 inode->i_size + fs->blocksize - 1) /
187 pb.truncate_offset = inode->i_size % fs->blocksize;
190 pb.truncate_block = 0;
191 pb.truncate_offset = 0;
193 pb.truncated_blocks = 0;
194 retval = ext2fs_block_iterate(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
195 block_buf, release_inode_block, &pb);
197 com_err("release_inode_blocks", retval,
198 _("while calling ext2fs_block_iterate for inode %d"),
205 /* Refresh the inode since ext2fs_block_iterate may have changed it */
206 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
208 if (pb.truncated_blocks)
209 inode->i_blocks -= pb.truncated_blocks *
210 (fs->blocksize / 512);
212 if (inode->i_file_acl) {
213 retval = ext2fs_adjust_ea_refcount(fs, inode->i_file_acl,
214 block_buf, -1, &count);
215 if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) {
220 com_err("release_inode_blocks", retval,
221 _("while calling ext2fs_adjust_ea_refocunt for inode %d"),
226 ext2fs_block_alloc_stats(fs, inode->i_file_acl, -1);
227 inode->i_file_acl = 0;
233 * This function releases all of the orphan inodes. It returns 1 if
234 * it hit some error, and 0 on success.
236 static int release_orphan_inodes(e2fsck_t ctx)
238 ext2_filsys fs = ctx->fs;
239 ext2_ino_t ino, next_ino;
240 struct ext2_inode inode;
241 struct problem_context pctx;
244 if ((ino = fs->super->s_last_orphan) == 0)
248 * Win or lose, we won't be using the head of the orphan inode
251 fs->super->s_last_orphan = 0;
252 ext2fs_mark_super_dirty(fs);
255 * If the filesystem contains errors, don't run the orphan
256 * list, since the orphan list can't be trusted; and we're
257 * going to be running a full e2fsck run anyway...
259 if (fs->super->s_state & EXT2_ERROR_FS)
262 if ((ino < EXT2_FIRST_INODE(fs->super)) ||
263 (ino > fs->super->s_inodes_count)) {
264 clear_problem_context(&pctx);
266 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
270 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
271 "block iterate buffer");
272 e2fsck_read_bitmaps(ctx);
275 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
276 clear_problem_context(&pctx);
279 pctx.str = inode.i_links_count ? _("Truncating") :
282 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
284 next_ino = inode.i_dtime;
286 ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
287 (next_ino > fs->super->s_inodes_count))) {
289 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
293 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
296 if (!inode.i_links_count) {
297 ext2fs_inode_alloc_stats2(fs, ino, -1,
298 LINUX_S_ISDIR(inode.i_mode));
299 inode.i_dtime = time(0);
303 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
306 ext2fs_free_mem((void **) &block_buf);
309 ext2fs_free_mem((void **) &block_buf);
314 void check_super_block(e2fsck_t ctx)
316 ext2_filsys fs = ctx->fs;
317 blk_t first_block, last_block;
318 struct ext2_super_block *sb = fs->super;
319 blk_t blocks_per_group = fs->super->s_blocks_per_group;
321 int inodes_per_block;
325 struct problem_context pctx;
327 inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super);
328 ipg_max = inodes_per_block * (blocks_per_group - 4);
329 if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb))
330 ipg_max = EXT2_MAX_INODES_PER_GROUP(sb);
331 bpg_max = 8 * EXT2_BLOCK_SIZE(sb);
332 if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb))
333 bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb);
335 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
336 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
337 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
338 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
339 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
340 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
342 clear_problem_context(&pctx);
345 * Verify the super block constants...
347 check_super_value(ctx, "inodes_count", sb->s_inodes_count,
349 check_super_value(ctx, "blocks_count", sb->s_blocks_count,
351 check_super_value(ctx, "first_data_block", sb->s_first_data_block,
352 MAX_CHECK, 0, sb->s_blocks_count);
353 check_super_value(ctx, "log_block_size", sb->s_log_block_size,
354 MIN_CHECK | MAX_CHECK, 0,
355 EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE);
356 check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
357 MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size);
358 check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
359 MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group,
361 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
362 MIN_CHECK | MAX_CHECK, 8, bpg_max);
363 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
364 MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max);
365 check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count,
366 MAX_CHECK, 0, sb->s_blocks_count / 4);
368 if (!ctx->num_blocks) {
369 pctx.errcode = e2fsck_get_device_size(ctx);
370 if (pctx.errcode && pctx.errcode != EXT2_ET_UNIMPLEMENTED) {
371 fix_problem(ctx, PR_0_GETSIZE_ERROR, &pctx);
372 ctx->flags |= E2F_FLAG_ABORT;
375 if ((pctx.errcode != EXT2_ET_UNIMPLEMENTED) &&
376 (ctx->num_blocks < sb->s_blocks_count)) {
377 pctx.blk = sb->s_blocks_count;
378 pctx.blk2 = ctx->num_blocks;
379 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
380 ctx->flags |= E2F_FLAG_ABORT;
386 if (sb->s_log_block_size != sb->s_log_frag_size) {
387 pctx.blk = EXT2_BLOCK_SIZE(sb);
388 pctx.blk2 = EXT2_FRAG_SIZE(sb);
389 fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
390 ctx->flags |= E2F_FLAG_ABORT;
394 should_be = sb->s_frags_per_group >>
395 (sb->s_log_block_size - sb->s_log_frag_size);
396 if (sb->s_blocks_per_group != should_be) {
397 pctx.blk = sb->s_blocks_per_group;
398 pctx.blk2 = should_be;
399 fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
400 ctx->flags |= E2F_FLAG_ABORT;
404 should_be = (sb->s_log_block_size == 0) ? 1 : 0;
405 if (sb->s_first_data_block != should_be) {
406 pctx.blk = sb->s_first_data_block;
407 pctx.blk2 = should_be;
408 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
409 ctx->flags |= E2F_FLAG_ABORT;
413 should_be = sb->s_inodes_per_group * fs->group_desc_count;
414 if (sb->s_inodes_count != should_be) {
415 pctx.ino = sb->s_inodes_count;
416 pctx.ino2 = should_be;
417 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
418 sb->s_inodes_count = should_be;
419 ext2fs_mark_super_dirty(fs);
424 * Verify the group descriptors....
426 first_block = fs->super->s_first_data_block;
427 last_block = first_block + blocks_per_group;
429 for (i = 0; i < fs->group_desc_count; i++) {
432 if (i == fs->group_desc_count - 1)
433 last_block = fs->super->s_blocks_count;
434 if ((fs->group_desc[i].bg_block_bitmap < first_block) ||
435 (fs->group_desc[i].bg_block_bitmap >= last_block)) {
436 pctx.blk = fs->group_desc[i].bg_block_bitmap;
437 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx))
438 fs->group_desc[i].bg_block_bitmap = 0;
440 if (fs->group_desc[i].bg_block_bitmap == 0) {
441 ctx->invalid_block_bitmap_flag[i]++;
442 ctx->invalid_bitmaps++;
444 if ((fs->group_desc[i].bg_inode_bitmap < first_block) ||
445 (fs->group_desc[i].bg_inode_bitmap >= last_block)) {
446 pctx.blk = fs->group_desc[i].bg_inode_bitmap;
447 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx))
448 fs->group_desc[i].bg_inode_bitmap = 0;
450 if (fs->group_desc[i].bg_inode_bitmap == 0) {
451 ctx->invalid_inode_bitmap_flag[i]++;
452 ctx->invalid_bitmaps++;
454 if ((fs->group_desc[i].bg_inode_table < first_block) ||
455 ((fs->group_desc[i].bg_inode_table +
456 fs->inode_blocks_per_group - 1) >= last_block)) {
457 pctx.blk = fs->group_desc[i].bg_inode_table;
458 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx))
459 fs->group_desc[i].bg_inode_table = 0;
461 if (fs->group_desc[i].bg_inode_table == 0) {
462 ctx->invalid_inode_table_flag[i]++;
463 ctx->invalid_bitmaps++;
465 first_block += fs->super->s_blocks_per_group;
466 last_block += fs->super->s_blocks_per_group;
469 * If we have invalid bitmaps, set the error state of the
472 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
473 fs->super->s_state &= ~EXT2_VALID_FS;
474 ext2fs_mark_super_dirty(fs);
477 clear_problem_context(&pctx);
479 #ifndef EXT2_SKIP_UUID
481 * If the UUID field isn't assigned, assign it.
483 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
484 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
485 uuid_generate(sb->s_uuid);
486 ext2fs_mark_super_dirty(fs);
492 * For the Hurd, check to see if the filetype option is set,
493 * since it doesn't support it.
495 if (!(ctx->options & E2F_OPT_READONLY) &&
496 fs->super->s_creator_os == EXT2_OS_HURD &&
497 (fs->super->s_feature_incompat &
498 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
499 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
500 fs->super->s_feature_incompat &=
501 ~EXT2_FEATURE_INCOMPAT_FILETYPE;
502 ext2fs_mark_super_dirty(fs);
508 * If we have any of the compatibility flags set, we need to have a
509 * revision 1 filesystem. Most kernels will not check the flags on
510 * a rev 0 filesystem and we may have corruption issues because of
511 * the incompatible changes to the filesystem.
513 if (!(ctx->options & E2F_OPT_READONLY) &&
514 fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
515 (fs->super->s_feature_compat ||
516 fs->super->s_feature_ro_compat ||
517 fs->super->s_feature_incompat) &&
518 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
519 ext2fs_update_dynamic_rev(fs);
520 ext2fs_mark_super_dirty(fs);
524 * Clean up any orphan inodes, if present.
526 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
527 fs->super->s_state &= ~EXT2_VALID_FS;
528 ext2fs_mark_super_dirty(fs);
532 * Move the ext3 journal file, if necessary.
534 e2fsck_move_ext3_journal(ctx);