| /* |
| * pass2.c --- check directory structure |
| * |
| * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| * |
| * Pass 2 of e2fsck iterates through all active directory inodes, and |
| * applies to following tests to each directory entry in the directory |
| * blocks in the inodes: |
| * |
| * - The length of the directory entry (rec_len) should be at |
| * least 8 bytes, and no more than the remaining space |
| * left in the directory block. |
| * - The length of the name in the directory entry (name_len) |
| * should be less than (rec_len - 8). |
| * - The inode number in the directory entry should be within |
| * legal bounds. |
| * - The inode number should refer to a in-use inode. |
| * - The first entry should be '.', and its inode should be |
| * the inode of the directory. |
| * - The second entry should be '..'. |
| * |
| * To minimize disk seek time, the directory blocks are processed in |
| * sorted order of block numbers. |
| * |
| * Pass 2 also collects the following information: |
| * - The inode numbers of the subdirectories for each directory. |
| * |
| * Pass 2 relies on the following information from previous passes: |
| * - The directory information collected in pass 1. |
| * - The inode_used_map bitmap |
| * - The inode_bad_map bitmap |
| * - The inode_dir_map bitmap |
| * |
| * Pass 2 frees the following data structures |
| * - The inode_bad_map bitmap |
| */ |
| |
| #include "et/com_err.h" |
| |
| #include "e2fsck.h" |
| #include "problem.h" |
| |
| /* |
| * Keeps track of how many times an inode is referenced. |
| */ |
| ext2_icount_t inode_count = 0; |
| |
| static void deallocate_inode(ext2_filsys fs, ino_t ino, |
| char* block_buf); |
| static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino); |
| static int check_dir_block(ext2_filsys fs, |
| struct ext2_db_entry *dir_blocks_info, |
| void *private); |
| static int allocate_dir_block(ext2_filsys fs, |
| struct ext2_db_entry *dir_blocks_info, |
| char *buf, struct problem_context *pctx); |
| static int update_dir_block(ext2_filsys fs, |
| blk_t *block_nr, |
| int blockcnt, |
| void *private); |
| |
| struct check_dir_struct { |
| char *buf; |
| struct problem_context pctx; |
| }; |
| |
| void pass2(ext2_filsys fs) |
| { |
| char *buf; |
| struct resource_track rtrack; |
| struct dir_info *dir; |
| errcode_t retval; |
| ino_t size; |
| struct check_dir_struct cd; |
| |
| init_resource_track(&rtrack); |
| |
| #ifdef MTRACE |
| mtrace_print("Pass 2"); |
| #endif |
| |
| if (!preen) |
| printf("Pass 2: Checking directory structure\n"); |
| retval = ext2fs_create_icount2(fs, EXT2_ICOUNT_OPT_INCREMENT, |
| 0, inode_link_info, &inode_count); |
| if (retval) { |
| com_err("ext2fs_create_icount", retval, |
| "while creating inode_count"); |
| fatal_error(0); |
| } |
| buf = allocate_memory(fs->blocksize, "directory scan buffer"); |
| |
| /* |
| * Set up the parent pointer for the root directory, if |
| * present. (If the root directory is not present, we will |
| * create it in pass 3.) |
| */ |
| dir = get_dir_info(EXT2_ROOT_INO); |
| if (dir) |
| dir->parent = EXT2_ROOT_INO; |
| |
| cd.buf = buf; |
| clear_problem_context(&cd.pctx); |
| |
| retval = ext2fs_dblist_iterate(fs->dblist, check_dir_block, &cd); |
| if (retval) { |
| com_err("ext2fs_dblist_iterate", retval, |
| "while iterating through dblist"); |
| fatal_error(0); |
| } |
| |
| free(buf); |
| ext2fs_free_dblist(fs->dblist); |
| |
| if (inode_bad_map) { |
| ext2fs_free_inode_bitmap(inode_bad_map); |
| inode_bad_map = 0; |
| } |
| if (tflag > 1) { |
| printf("Pass 2: "); |
| print_resource_track(&rtrack); |
| } |
| } |
| |
| /* |
| * Make sure the first entry in the directory is '.', and that the |
| * directory entry is sane. |
| */ |
| static int check_dot(ext2_filsys fs, |
| struct ext2_dir_entry *dirent, |
| ino_t ino, struct problem_context *pctx) |
| { |
| struct ext2_dir_entry *nextdir; |
| int status = 0; |
| int created = 0; |
| int new_len; |
| int problem = 0; |
| |
| if (!dirent->inode) |
| problem = PR_2_MISSING_DOT; |
| else if ((dirent->name_len != 1) || |
| (dirent->name[0] != '.')) |
| problem = PR_2_1ST_NOT_DOT; |
| else if (dirent->name[1] != '\0') |
| problem = PR_2_DOT_NULL_TERM; |
| |
| if (problem) { |
| if (fix_problem(fs, problem, pctx)) { |
| if (dirent->rec_len < 12) |
| dirent->rec_len = 12; |
| dirent->inode = ino; |
| dirent->name_len = 1; |
| dirent->name[0] = '.'; |
| dirent->name[1] = '\0'; |
| status = 1; |
| created = 1; |
| } |
| } |
| if (dirent->inode != ino) { |
| if (fix_problem(fs, PR_2_BAD_INODE_DOT, pctx)) { |
| dirent->inode = ino; |
| status = 1; |
| } |
| } |
| if (dirent->rec_len > 12) { |
| new_len = dirent->rec_len - 12; |
| if (new_len > 12) { |
| preenhalt(fs); |
| if (created || |
| ask("Directory entry for '.' is big. Split", 1)) { |
| nextdir = (struct ext2_dir_entry *) |
| ((char *) dirent + 12); |
| dirent->rec_len = 12; |
| nextdir->rec_len = new_len; |
| nextdir->inode = 0; |
| nextdir->name_len = 0; |
| status = 1; |
| } |
| } |
| } |
| return status; |
| } |
| |
| /* |
| * Make sure the second entry in the directory is '..', and that the |
| * directory entry is sane. We do not check the inode number of '..' |
| * here; this gets done in pass 3. |
| */ |
| static int check_dotdot(ext2_filsys fs, |
| struct ext2_dir_entry *dirent, |
| struct dir_info *dir, struct problem_context *pctx) |
| { |
| int problem = 0; |
| |
| if (!dirent->inode) |
| problem = PR_2_MISSING_DOT_DOT; |
| else if ((dirent->name_len != 2) || |
| (dirent->name[0] != '.') || |
| (dirent->name[1] != '.')) |
| problem = PR_2_2ND_NOT_DOT_DOT; |
| else if (dirent->name[2] != '\0') |
| problem = PR_2_DOT_DOT_NULL_TERM; |
| |
| if (problem) { |
| if (fix_problem(fs, problem, pctx)) { |
| if (dirent->rec_len < 12) |
| dirent->rec_len = 12; |
| /* |
| * Note: we don't have the parent inode just |
| * yet, so we will fill it in with the root |
| * inode. This will get fixed in pass 3. |
| */ |
| dirent->inode = EXT2_ROOT_INO; |
| dirent->name_len = 2; |
| dirent->name[0] = '.'; |
| dirent->name[1] = '.'; |
| dirent->name[2] = '\0'; |
| return 1; |
| } |
| return 0; |
| } |
| dir->dotdot = dirent->inode; |
| return 0; |
| } |
| |
| /* |
| * Check to make sure a directory entry doesn't contain any illegal |
| * characters. |
| */ |
| static int check_name(ext2_filsys fs, |
| struct ext2_dir_entry *dirent, |
| ino_t dir_ino, struct problem_context *pctx) |
| { |
| int i; |
| int fixup = -1; |
| int ret = 0; |
| |
| for ( i = 0; i < dirent->name_len; i++) { |
| if (dirent->name[i] == '/' || dirent->name[i] == '\0') { |
| if (fixup < 0) { |
| fixup = fix_problem(fs, PR_2_BAD_NAME, pctx); |
| } |
| if (fixup) { |
| dirent->name[i] = '.'; |
| ret = 1; |
| } |
| } |
| } |
| return ret; |
| } |
| |
| static int check_dir_block(ext2_filsys fs, |
| struct ext2_db_entry *db, |
| void *private) |
| { |
| struct dir_info *subdir, *dir; |
| struct ext2_dir_entry *dirent; |
| int offset = 0; |
| int dir_modified = 0; |
| errcode_t retval; |
| int dot_state; |
| blk_t block_nr = db->blk; |
| ino_t ino = db->ino; |
| __u16 links; |
| struct check_dir_struct *cd = private; |
| char *buf = cd->buf; |
| |
| /* |
| * Make sure the inode is still in use (could have been |
| * deleted in the duplicate/bad blocks pass. |
| */ |
| if (!(ext2fs_test_inode_bitmap(inode_used_map, ino))) |
| return 0; |
| |
| cd->pctx.ino = ino; |
| cd->pctx.blk = block_nr; |
| cd->pctx.blkcount = db->blockcnt; |
| cd->pctx.ino2 = 0; |
| cd->pctx.dirent = 0; |
| cd->pctx.num = 0; |
| |
| if (db->blk == 0) { |
| if (allocate_dir_block(fs, db, buf, &cd->pctx)) |
| return 0; |
| block_nr = db->blk; |
| } |
| |
| if (db->blockcnt) |
| dot_state = 2; |
| else |
| dot_state = 0; |
| |
| #if 0 |
| printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr, |
| db->blockcnt, ino); |
| #endif |
| |
| retval = ext2fs_read_dir_block(fs, block_nr, buf); |
| if (retval) { |
| com_err(program_name, retval, |
| "while reading directory block %d", block_nr); |
| } |
| |
| do { |
| dot_state++; |
| dirent = (struct ext2_dir_entry *) (buf + offset); |
| cd->pctx.dirent = dirent; |
| cd->pctx.num = offset; |
| if (((offset + dirent->rec_len) > fs->blocksize) || |
| (dirent->rec_len < 8) || |
| ((dirent->rec_len % 4) != 0) || |
| ((dirent->name_len+8) > dirent->rec_len)) { |
| if (fix_problem(fs, PR_2_DIR_CORRUPTED, &cd->pctx)) { |
| dirent->rec_len = fs->blocksize - offset; |
| dirent->name_len = 0; |
| dirent->inode = 0; |
| dir_modified++; |
| } else |
| return DIRENT_ABORT; |
| } |
| |
| if (dirent->name_len > EXT2_NAME_LEN) { |
| if (fix_problem(fs, PR_2_FILENAME_LONG, &cd->pctx)) { |
| dirent->name_len = EXT2_NAME_LEN; |
| dir_modified++; |
| } |
| } |
| |
| if (dot_state == 1) { |
| if (check_dot(fs, dirent, ino, &cd->pctx)) |
| dir_modified++; |
| } else if (dot_state == 2) { |
| dir = get_dir_info(ino); |
| if (!dir) { |
| printf("Internal error: couldn't find dir_info for %lu\n", |
| ino); |
| fatal_error(0); |
| } |
| if (check_dotdot(fs, dirent, dir, &cd->pctx)) |
| dir_modified++; |
| } else if (dirent->inode == ino) { |
| if (fix_problem(fs, PR_2_LINK_DOT, &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| if (!dirent->inode) |
| goto next; |
| |
| if (check_name(fs, dirent, ino, &cd->pctx)) |
| dir_modified++; |
| |
| /* |
| * Make sure the inode listed is a legal one. |
| */ |
| if (((dirent->inode != EXT2_ROOT_INO) && |
| (dirent->inode < EXT2_FIRST_INODE(fs->super))) || |
| (dirent->inode > fs->super->s_inodes_count)) { |
| if (fix_problem(fs, PR_2_BAD_INO, &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| |
| /* |
| * If the inode is unused, offer to clear it. |
| */ |
| if (!(ext2fs_test_inode_bitmap(inode_used_map, |
| dirent->inode))) { |
| if (fix_problem(fs, PR_2_UNUSED_INODE, &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| |
| /* |
| * If the inode is in a bad block, offer to clear it. |
| */ |
| if (inode_bb_map && |
| (ext2fs_test_inode_bitmap(inode_bb_map, |
| dirent->inode))) { |
| if (fix_problem(fs, PR_2_BB_INODE, &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| |
| /* |
| * If the inode was marked as having bad fields in |
| * pass1, process it and offer to fix/clear it. |
| * (We wait until now so that we can display the |
| * pathname to the user.) |
| */ |
| if (inode_bad_map && |
| ext2fs_test_inode_bitmap(inode_bad_map, |
| dirent->inode)) { |
| if (process_bad_inode(fs, ino, dirent->inode)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| |
| /* |
| * Don't allow links to the root directory. We check |
| * this specially to make sure we catch this error |
| * case even if the root directory hasn't been created |
| * yet. |
| */ |
| if ((dot_state > 2) && (dirent->inode == EXT2_ROOT_INO)) { |
| if (fix_problem(fs, PR_2_LINK_ROOT, &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| } |
| |
| /* |
| * If this is a directory, then mark its parent in its |
| * dir_info structure. If the parent field is already |
| * filled in, then this directory has more than one |
| * hard link. We assume the first link is correct, |
| * and ask the user if he/she wants to clear this one. |
| */ |
| if ((dot_state > 2) && |
| (ext2fs_test_inode_bitmap(inode_dir_map, |
| dirent->inode))) { |
| subdir = get_dir_info(dirent->inode); |
| if (!subdir) { |
| printf("INTERNAL ERROR: missing dir %u\n", |
| dirent->inode); |
| fatal_error(0); |
| } |
| if (subdir->parent) { |
| cd->pctx.ino2 = subdir->parent; |
| if (fix_problem(fs, PR_2_LINK_DIR, |
| &cd->pctx)) { |
| dirent->inode = 0; |
| dir_modified++; |
| goto next; |
| } |
| cd->pctx.ino2 = 0; |
| } else |
| subdir->parent = ino; |
| } |
| |
| ext2fs_icount_increment(inode_count, dirent->inode, &links); |
| if (links > 1) |
| fs_links_count++; |
| fs_total_count++; |
| next: |
| offset += dirent->rec_len; |
| } while (offset < fs->blocksize); |
| #if 0 |
| printf("\n"); |
| #endif |
| if (offset != fs->blocksize) { |
| printf("Final rec_len is %d, should be %d\n", |
| dirent->rec_len, |
| dirent->rec_len - fs->blocksize + offset); |
| } |
| if (dir_modified) { |
| retval = ext2fs_write_dir_block(fs, block_nr, buf); |
| if (retval) { |
| com_err(program_name, retval, |
| "while writing directory block %d", block_nr); |
| } |
| ext2fs_mark_changed(fs); |
| } |
| return 0; |
| } |
| |
| /* |
| * This function is called to deallocate a block, and is an interator |
| * functioned called by deallocate inode via ext2fs_iterate_block(). |
| */ |
| static int deallocate_inode_block(ext2_filsys fs, |
| blk_t *block_nr, |
| int blockcnt, |
| void *private) |
| { |
| if (!*block_nr) |
| return 0; |
| ext2fs_unmark_block_bitmap(block_found_map, *block_nr); |
| ext2fs_unmark_block_bitmap(fs->block_map, *block_nr); |
| return 0; |
| } |
| |
| /* |
| * This fuction deallocates an inode |
| */ |
| static void deallocate_inode(ext2_filsys fs, ino_t ino, |
| char* block_buf) |
| { |
| errcode_t retval; |
| struct ext2_inode inode; |
| |
| ext2fs_icount_store(inode_link_info, ino, 0); |
| e2fsck_read_inode(fs, ino, &inode, "deallocate_inode"); |
| inode.i_links_count = 0; |
| inode.i_dtime = time(0); |
| e2fsck_write_inode(fs, ino, &inode, "deallocate_inode"); |
| |
| /* |
| * Fix up the bitmaps... |
| */ |
| read_bitmaps(fs); |
| ext2fs_unmark_inode_bitmap(inode_used_map, ino); |
| ext2fs_unmark_inode_bitmap(inode_dir_map, ino); |
| if (inode_bad_map) |
| ext2fs_unmark_inode_bitmap(inode_bad_map, ino); |
| ext2fs_unmark_inode_bitmap(fs->inode_map, ino); |
| ext2fs_mark_ib_dirty(fs); |
| |
| if (!ext2fs_inode_has_valid_blocks(&inode)) |
| return; |
| |
| ext2fs_mark_bb_dirty(fs); |
| retval = ext2fs_block_iterate(fs, ino, 0, block_buf, |
| deallocate_inode_block, 0); |
| if (retval) |
| com_err("deallocate_inode", retval, |
| "while calling ext2fs_block_iterate for inode %d", |
| ino); |
| } |
| |
| static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino) |
| { |
| struct ext2_inode inode; |
| int inode_modified = 0; |
| unsigned char *frag, *fsize; |
| struct problem_context pctx; |
| |
| e2fsck_read_inode(fs, ino, &inode, "process_bad_inode"); |
| |
| clear_problem_context(&pctx); |
| pctx.ino = ino; |
| pctx.dir = dir; |
| pctx.inode = &inode; |
| |
| if (!LINUX_S_ISDIR(inode.i_mode) && !LINUX_S_ISREG(inode.i_mode) && |
| !LINUX_S_ISCHR(inode.i_mode) && !LINUX_S_ISBLK(inode.i_mode) && |
| !LINUX_S_ISLNK(inode.i_mode) && !LINUX_S_ISFIFO(inode.i_mode) && |
| !(LINUX_S_ISSOCK(inode.i_mode))) { |
| if (fix_problem(fs, PR_2_BAD_MODE, &pctx)) { |
| deallocate_inode(fs, ino, 0); |
| return 1; |
| } |
| } |
| if (inode.i_faddr && |
| fix_problem(fs, PR_2_FADDR_ZERO, &pctx)) { |
| inode.i_faddr = 0; |
| inode_modified++; |
| } |
| |
| switch (fs->super->s_creator_os) { |
| case EXT2_OS_LINUX: |
| frag = &inode.osd2.linux2.l_i_frag; |
| fsize = &inode.osd2.linux2.l_i_fsize; |
| break; |
| case EXT2_OS_HURD: |
| frag = &inode.osd2.hurd2.h_i_frag; |
| fsize = &inode.osd2.hurd2.h_i_fsize; |
| break; |
| case EXT2_OS_MASIX: |
| frag = &inode.osd2.masix2.m_i_frag; |
| fsize = &inode.osd2.masix2.m_i_fsize; |
| break; |
| default: |
| frag = fsize = 0; |
| } |
| if (frag && *frag) { |
| pctx.num = *frag; |
| if (fix_problem(fs, PR_2_FRAG_ZERO, &pctx)) { |
| *frag = 0; |
| inode_modified++; |
| } |
| pctx.num = 0; |
| } |
| if (fsize && *fsize) { |
| pctx.num = *fsize; |
| if (fix_problem(fs, PR_2_FSIZE_ZERO, &pctx)) { |
| *fsize = 0; |
| inode_modified++; |
| } |
| pctx.num = 0; |
| } |
| |
| if (inode.i_file_acl && |
| fix_problem(fs, PR_2_FILE_ACL_ZERO, &pctx)) { |
| inode.i_file_acl = 0; |
| inode_modified++; |
| } |
| if (inode.i_dir_acl && |
| fix_problem(fs, PR_2_DIR_ACL_ZERO, &pctx)) { |
| inode.i_dir_acl = 0; |
| inode_modified++; |
| } |
| if (inode_modified) |
| e2fsck_write_inode(fs, ino, &inode, "process_bad_inode"); |
| return 0; |
| } |
| |
| |
| /* |
| * allocate_dir_block --- this function allocates a new directory |
| * block for a particular inode; this is done if a directory has |
| * a "hole" in it, or if a directory has a illegal block number |
| * that was zeroed out and now needs to be replaced. |
| */ |
| static int allocate_dir_block(ext2_filsys fs, |
| struct ext2_db_entry *db, |
| char *buf, struct problem_context *pctx) |
| { |
| blk_t blk; |
| char *block; |
| struct ext2_inode inode; |
| errcode_t retval; |
| |
| if (fix_problem(fs, PR_2_DIRECTORY_HOLE, pctx) == 0) |
| return 1; |
| |
| /* |
| * Read the inode and block bitmaps in; we'll be messing with |
| * them. |
| */ |
| read_bitmaps(fs); |
| |
| /* |
| * First, find a free block |
| */ |
| retval = ext2fs_new_block(fs, 0, block_found_map, &blk); |
| if (retval) { |
| com_err("allocate_dir_block", retval, |
| "while trying to fill a hole in a directory inode"); |
| return 1; |
| } |
| ext2fs_mark_block_bitmap(block_found_map, blk); |
| ext2fs_mark_block_bitmap(fs->block_map, blk); |
| ext2fs_mark_bb_dirty(fs); |
| |
| /* |
| * Now let's create the actual data block for the inode |
| */ |
| if (db->blockcnt) |
| retval = ext2fs_new_dir_block(fs, 0, 0, &block); |
| else |
| retval = ext2fs_new_dir_block(fs, db->ino, EXT2_ROOT_INO, |
| &block); |
| |
| if (retval) { |
| com_err("allocate_dir_block", retval, |
| "while creating new directory block"); |
| return 1; |
| } |
| |
| retval = ext2fs_write_dir_block(fs, blk, block); |
| free(block); |
| if (retval) { |
| com_err("allocate_dir_block", retval, |
| "while writing an empty directory block"); |
| return 1; |
| } |
| |
| /* |
| * Update the inode block count |
| */ |
| e2fsck_read_inode(fs, db->ino, &inode, "allocate_dir_block"); |
| inode.i_blocks += fs->blocksize / 512; |
| if (inode.i_size < (db->blockcnt+1) * fs->blocksize) |
| inode.i_size = (db->blockcnt+1) * fs->blocksize; |
| e2fsck_write_inode(fs, db->ino, &inode, "allocate_dir_block"); |
| |
| /* |
| * Finally, update the block pointers for the inode |
| */ |
| db->blk = blk; |
| retval = ext2fs_block_iterate(fs, db->ino, BLOCK_FLAG_HOLE, |
| 0, update_dir_block, db); |
| if (retval) { |
| com_err("allocate_dir_block", retval, |
| "while calling ext2fs_block_iterate"); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * This is a helper function for allocate_dir_block(). |
| */ |
| static int update_dir_block(ext2_filsys fs, |
| blk_t *block_nr, |
| int blockcnt, |
| void *private) |
| { |
| struct ext2_db_entry *db = private; |
| |
| if (db->blockcnt == blockcnt) { |
| *block_nr = db->blk; |
| return BLOCK_CHANGED; |
| } |
| return 0; |
| } |
| |