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_unmark_block_bitmap(fs->block_map, blk);
156 fs->group_desc[ext2fs_group_of_blk(fs, blk)].bg_free_blocks_count++;
157 fs->super->s_free_blocks_count++;
163 * This function releases an inode. Returns 1 if an inconsistency was
164 * found. If the inode has a link count, then it is being truncated and
167 static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
168 struct ext2_inode *inode, char* block_buf,
169 struct problem_context *pctx)
171 ext2_filsys fs = ctx->fs;
173 struct process_block_struct pb;
175 pb.buf = block_buf + 3 * ctx->fs->blocksize;
180 if (inode->i_links_count) {
182 pb.truncate_block = (blk_t)
183 ((((long long)inode->i_size_high << 32) +
184 inode->i_size + fs->blocksize - 1) /
186 pb.truncate_offset = inode->i_size % fs->blocksize;
189 pb.truncate_block = 0;
190 pb.truncate_offset = 0;
192 pb.truncated_blocks = 0;
193 retval = ext2fs_block_iterate(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE,
194 block_buf, release_inode_block, &pb);
196 com_err("release_inode_blocks", retval,
197 _("while calling ext2fs_block_iterate for inode %d"),
204 /* Refresh the inode since ext2fs_block_iterate may have changed it */
205 e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks");
207 if (pb.truncated_blocks)
208 inode->i_blocks -= pb.truncated_blocks *
209 (fs->blocksize / 512);
211 ext2fs_mark_bb_dirty(fs);
216 * This function releases all of the orphan inodes. It returns 1 if
217 * it hit some error, and 0 on success.
219 static int release_orphan_inodes(e2fsck_t ctx)
221 ext2_filsys fs = ctx->fs;
223 ext2_ino_t ino, next_ino;
224 struct ext2_inode inode;
225 struct problem_context pctx;
228 if ((ino = fs->super->s_last_orphan) == 0)
232 * Win or lose, we won't be using the head of the orphan inode
235 fs->super->s_last_orphan = 0;
236 ext2fs_mark_super_dirty(fs);
238 if ((ino < EXT2_FIRST_INODE(fs->super)) ||
239 (ino > fs->super->s_inodes_count)) {
240 clear_problem_context(&pctx);
242 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx);
246 block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4,
247 "block iterate buffer");
248 e2fsck_read_bitmaps(ctx);
251 e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes");
252 clear_problem_context(&pctx);
255 pctx.str = inode.i_links_count ? "Truncating" : "Clearing";
257 fix_problem(ctx, PR_0_ORPHAN_CLEAR_INODE, &pctx);
259 next_ino = inode.i_dtime;
261 ((next_ino < EXT2_FIRST_INODE(fs->super)) ||
262 (next_ino > fs->super->s_inodes_count))) {
264 fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx);
268 if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx))
271 if (!inode.i_links_count) {
272 ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
273 ext2fs_mark_ib_dirty(fs);
274 group = ext2fs_group_of_ino(fs, ino);
275 fs->group_desc[group].bg_free_inodes_count++;
276 fs->super->s_free_inodes_count++;
277 if (LINUX_S_ISDIR(inode.i_mode))
278 fs->group_desc[group].bg_used_dirs_count--;
280 inode.i_dtime = time(0);
282 e2fsck_write_inode(ctx, ino, &inode, "delete_file");
287 ext2fs_free_mem((void **) &block_buf);
292 void check_super_block(e2fsck_t ctx)
294 ext2_filsys fs = ctx->fs;
295 blk_t first_block, last_block;
296 struct ext2_super_block *sb = fs->super;
297 blk_t blocks_per_group = fs->super->s_blocks_per_group;
298 int inodes_per_block;
301 struct problem_context pctx;
303 inodes_per_block = (EXT2_INODE_SIZE(fs->super) +
304 EXT2_BLOCK_SIZE(fs->super) - 1) /
305 EXT2_BLOCK_SIZE(fs->super);
307 ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
308 sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
309 ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
310 sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
311 ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
312 sizeof(int) * fs->group_desc_count, "invalid_inode_table");
314 clear_problem_context(&pctx);
317 * Verify the super block constants...
319 check_super_value(ctx, "inodes_count", sb->s_inodes_count,
321 check_super_value(ctx, "blocks_count", sb->s_blocks_count,
323 check_super_value(ctx, "first_data_block", sb->s_first_data_block,
324 MAX_CHECK, 0, sb->s_blocks_count);
325 check_super_value(ctx, "log_frag_size", sb->s_log_frag_size,
327 check_super_value(ctx, "log_block_size", sb->s_log_block_size,
328 MIN_CHECK | MAX_CHECK, sb->s_log_frag_size,
330 check_super_value(ctx, "frags_per_group", sb->s_frags_per_group,
331 MIN_CHECK | MAX_CHECK, 1, 8 * EXT2_BLOCK_SIZE(sb));
332 check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group,
333 MIN_CHECK | MAX_CHECK, 1, 8 * EXT2_BLOCK_SIZE(sb));
334 check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group,
335 MIN_CHECK | MAX_CHECK, 1,
336 inodes_per_block * blocks_per_group);
337 check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count,
338 MAX_CHECK, 0, sb->s_blocks_count);
340 if (!ctx->num_blocks) {
341 pctx.errcode = e2fsck_get_device_size(ctx);
342 if (pctx.errcode && pctx.errcode != EXT2_ET_UNIMPLEMENTED) {
343 fix_problem(ctx, PR_0_GETSIZE_ERROR, &pctx);
344 ctx->flags |= E2F_FLAG_ABORT;
347 if ((pctx.errcode != EXT2_ET_UNIMPLEMENTED) &&
348 (ctx->num_blocks < sb->s_blocks_count)) {
349 pctx.blk = sb->s_blocks_count;
350 pctx.blk2 = ctx->num_blocks;
351 if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
352 ctx->flags |= E2F_FLAG_ABORT;
358 if (sb->s_log_block_size != sb->s_log_frag_size) {
359 pctx.blk = EXT2_BLOCK_SIZE(sb);
360 pctx.blk2 = EXT2_FRAG_SIZE(sb);
361 fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
362 ctx->flags |= E2F_FLAG_ABORT;
366 should_be = sb->s_frags_per_group >>
367 (sb->s_log_block_size - sb->s_log_frag_size);
368 if (sb->s_blocks_per_group != should_be) {
369 pctx.blk = sb->s_blocks_per_group;
370 pctx.blk2 = should_be;
371 fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
372 ctx->flags |= E2F_FLAG_ABORT;
376 should_be = (sb->s_log_block_size == 0) ? 1 : 0;
377 if (sb->s_first_data_block != should_be) {
378 pctx.blk = sb->s_first_data_block;
379 pctx.blk2 = should_be;
380 fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
381 ctx->flags |= E2F_FLAG_ABORT;
385 should_be = sb->s_inodes_per_group * fs->group_desc_count;
386 if (sb->s_inodes_count != should_be) {
387 pctx.ino = sb->s_inodes_count;
388 pctx.ino2 = should_be;
389 if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) {
390 sb->s_inodes_count = should_be;
391 ext2fs_mark_super_dirty(fs);
396 * Verify the group descriptors....
398 first_block = fs->super->s_first_data_block;
399 last_block = first_block + blocks_per_group;
401 for (i = 0; i < fs->group_desc_count; i++) {
404 if (i == fs->group_desc_count - 1)
405 last_block = fs->super->s_blocks_count;
406 if ((fs->group_desc[i].bg_block_bitmap < first_block) ||
407 (fs->group_desc[i].bg_block_bitmap >= last_block)) {
408 pctx.blk = fs->group_desc[i].bg_block_bitmap;
409 if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) {
410 fs->group_desc[i].bg_block_bitmap = 0;
411 ctx->invalid_block_bitmap_flag[i]++;
412 ctx->invalid_bitmaps++;
415 if ((fs->group_desc[i].bg_inode_bitmap < first_block) ||
416 (fs->group_desc[i].bg_inode_bitmap >= last_block)) {
417 pctx.blk = fs->group_desc[i].bg_inode_bitmap;
418 if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) {
419 fs->group_desc[i].bg_inode_bitmap = 0;
420 ctx->invalid_inode_bitmap_flag[i]++;
421 ctx->invalid_bitmaps++;
424 if ((fs->group_desc[i].bg_inode_table < first_block) ||
425 ((fs->group_desc[i].bg_inode_table +
426 fs->inode_blocks_per_group - 1) >= last_block)) {
427 pctx.blk = fs->group_desc[i].bg_inode_table;
428 if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) {
429 fs->group_desc[i].bg_inode_table = 0;
430 ctx->invalid_inode_table_flag[i]++;
431 ctx->invalid_bitmaps++;
434 first_block += fs->super->s_blocks_per_group;
435 last_block += fs->super->s_blocks_per_group;
438 * If we have invalid bitmaps, set the error state of the
441 if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
442 fs->super->s_state &= ~EXT2_VALID_FS;
443 ext2fs_mark_super_dirty(fs);
446 clear_problem_context(&pctx);
448 #ifndef EXT2_SKIP_UUID
450 * If the UUID field isn't assigned, assign it.
452 if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) {
453 if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
454 uuid_generate(sb->s_uuid);
455 ext2fs_mark_super_dirty(fs);
461 * For the Hurd, check to see if the filetype option is set,
462 * since it doesn't support it.
464 if (!(ctx->options & E2F_OPT_READONLY) &&
465 fs->super->s_creator_os == EXT2_OS_HURD &&
466 (fs->super->s_feature_incompat &
467 EXT2_FEATURE_INCOMPAT_FILETYPE)) {
468 if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) {
469 fs->super->s_feature_incompat &=
470 ~EXT2_FEATURE_INCOMPAT_FILETYPE;
471 ext2fs_mark_super_dirty(fs);
477 * If we have any of the compatibility flags set, we need to have a
478 * revision 1 filesystem. Most kernels will not check the flags on
479 * a rev 0 filesystem and we may have corruption issues because of
480 * the incompatible changes to the filesystem.
482 if (!(ctx->options & E2F_OPT_READONLY) &&
483 fs->super->s_rev_level == EXT2_GOOD_OLD_REV &&
484 (fs->super->s_feature_compat ||
485 fs->super->s_feature_ro_compat ||
486 fs->super->s_feature_incompat) &&
487 fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) {
488 ext2fs_update_dynamic_rev(fs);
489 ext2fs_mark_super_dirty(fs);
493 * Clean up any orphan inodes, if present.
495 if (!(ctx->options & E2F_OPT_READONLY) && release_orphan_inodes(ctx)) {
496 fs->super->s_state &= ~EXT2_VALID_FS;
497 ext2fs_mark_super_dirty(fs);