mirror of https://github.com/vitalif/e2fsprogs
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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* pass2.c --- check directory structure
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*
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* Copyright (C) 1993, 1994 Theodore Ts'o. This file may be
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* redistributed under the terms of the GNU Public License.
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*
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* Pass 2 of e2fsck iterates through all active directory inodes, and
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* applies to following tests to each directory entry in the directory
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* blocks in the inodes:
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*
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* - The length of the directory entry (rec_len) should be at
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* least 8 bytes, and no more than the remaining space
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* left in the directory block.
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* - The length of the name in the directory entry (name_len)
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* should be less than (rec_len - 8).
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* - The inode number in the directory entry should be within
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* legal bounds.
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* - The inode number should refer to a in-use inode.
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* - The first entry should be '.', and its inode should be
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* the inode of the directory.
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* - The second entry should be '..'.
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*
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* To minimize disk seek time, the directory blocks are processed in
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* sorted order of block numbers.
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*
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* Pass 2 also collects the following information:
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* - The inode numbers of the subdirectories for each directory.
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*
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* Pass 2 relies on the following information from previous passes:
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* - The directory information collected in pass 1.
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* - The inode_used_map bitmap
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* - The inode_bad_map bitmap
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* - The inode_dir_map bitmap
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* - The block_dup_map bitmap
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*
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* Pass 2 frees the following data structures
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* - The inode_bad_map bitmap
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*/
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#include "et/com_err.h"
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#include "e2fsck.h"
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/*
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* Keeps track of how many times an inode is referenced.
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*/
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unsigned short * inode_count;
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static void deallocate_inode(ext2_filsys fs, ino_t ino,
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char* block_buf);
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static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino);
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static int check_dir_block(ext2_filsys fs,
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struct dir_block_struct *dir_blocks_info,
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char *buf);
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void pass2(ext2_filsys fs)
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{
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int i;
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char *buf;
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struct resource_track rtrack;
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init_resource_track(&rtrack);
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#ifdef MTRACE
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mtrace_print("Pass 2");
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#endif
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if (!preen)
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printf("Pass 2: Checking directory structure\n");
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inode_count = allocate_memory((fs->super->s_inodes_count + 1) *
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sizeof(unsigned short),
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"buffer for inode count");
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buf = allocate_memory(fs->blocksize, "directory scan buffer");
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for (i=0; i < dir_block_count; i++)
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check_dir_block(fs, &dir_blocks[i], buf);
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free(buf);
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free(dir_blocks);
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if (inode_bad_map) {
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free(inode_bad_map);
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inode_bad_map = 0;
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}
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if (tflag > 1) {
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printf("Pass 2: ");
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print_resource_track(&rtrack);
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}
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}
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/*
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* Make sure the first entry in the directory is '.', and that the
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* directory entry is sane.
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*/
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static int check_dot(ext2_filsys fs,
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struct ext2_dir_entry *dirent,
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ino_t ino)
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{
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struct ext2_dir_entry *nextdir;
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int status = 0;
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int created = 0;
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int new_len;
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char name[BLOCK_SIZE];
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if (!dirent->inode) {
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printf("Missing '.' in directory inode %ld.\n", ino);
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if (dirent->rec_len < 12)
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fatal_error("Cannot fix, insufficient space to add '.'");
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preenhalt();
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if (ask("Fix", 1)) {
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dirent->inode = ino;
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dirent->name_len = 1;
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dirent->name[0] = '.';
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status = 1;
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created = 1;
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} else {
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ext2fs_unmark_valid(fs);
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return 0;
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}
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}
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if ((dirent->name_len != 1) ||
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strncmp(dirent->name, ".", dirent->name_len)) {
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strncpy(name, dirent->name, dirent->name_len);
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name[dirent->name_len] = '\0';
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printf("Missing '.' in directory inode %ld.\n", ino);
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printf("Cannot fix, first entry in directory contains '%s'\n",
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name);
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exit(FSCK_ERROR);
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}
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if (dirent->inode != ino) {
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printf("Bad inode number for '.' in directory inode %ld.\n",
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ino);
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preenhalt();
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if (ask("Fix", 1)) {
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dirent->inode = ino;
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status = 1;
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} else
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ext2fs_unmark_valid(fs);
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}
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if (dirent->rec_len > 12) {
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new_len = dirent->rec_len - 12;
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if (new_len > 12) {
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preenhalt();
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if (created ||
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ask("Directory entry for '.' is big. Split", 1)) {
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nextdir = (struct ext2_dir_entry *)
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((char *) dirent + 12);
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dirent->rec_len = 12;
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nextdir->rec_len = new_len;
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nextdir->inode = 0;
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nextdir->name_len = 0;
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status = 1;
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}
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}
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}
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return status;
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}
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/*
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* Make sure the second entry in the directory is '..', and that the
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* directory entry is sane. We do not check the inode number of '..'
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* here; this gets done in pass 3.
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*/
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static int check_dotdot(ext2_filsys fs,
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struct ext2_dir_entry *dirent,
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struct dir_info *dir)
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{
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char name[BLOCK_SIZE];
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int ino = dir->ino;
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if (!dirent->inode) {
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printf("Missing '..' in directory inode %d.\n", ino);
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if (dirent->rec_len < 12)
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fatal_error("Cannot fix, insufficient space to add '..'");
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preenhalt();
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if (ask("Fix", 1)) {
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/*
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* Note: we don't have the parent inode just
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* yet, so we will fill it in with the root
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* inode. This will get fixed in pass 3.
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*/
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dirent->inode = EXT2_ROOT_INO;
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dirent->name_len = 2;
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dirent->name[0] = '.';
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dirent->name[1] = '.';
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return 1;
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} else
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ext2fs_unmark_valid(fs);
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return 0;
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}
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if ((dirent->name_len != 2) ||
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strncmp(dirent->name, "..", dirent->name_len)) {
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strncpy(name, dirent->name, dirent->name_len);
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name[dirent->name_len] = '\0';
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printf("Missing '..' in directory inode %d.\n", ino);
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printf("Cannot fix, first entry in directory contains %s\n",
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name);
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exit(FSCK_ERROR);
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}
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dir->dotdot = dirent->inode;
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return 0;
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}
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/*
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* Check to make sure a directory entry doesn't contain any illegal
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* characters.
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*/
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static int check_name(ext2_filsys fs,
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struct ext2_dir_entry *dirent,
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ino_t dir_ino,
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char *name)
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{
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int i;
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int fixup = -1;
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char *pathname;
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int ret = 0;
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errcode_t retval;
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for ( i = 0; i < dirent->name_len; i++) {
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if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
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if (fixup < 0) {
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retval = ext2fs_get_pathname(fs, dir_ino,
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0, &pathname);
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if (retval) {
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com_err(program_name, retval, "while getting pathname in check_name");
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fatal_error(0);
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}
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printf ("Bad file name '%s' (contains '/' or "
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" null) in directory '%s'",
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pathname, name);
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free(pathname);
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preenhalt();
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fixup = ask("Replace '/' or null by '.'", 1);
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}
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if (fixup) {
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dirent->name[i] = '.';
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ret = 1;
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} else
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ext2fs_unmark_valid(fs);
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}
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}
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return ret;
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}
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static int check_dir_block(ext2_filsys fs,
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struct dir_block_struct *db,
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char *buf)
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{
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struct dir_info *subdir, *dir;
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struct ext2_dir_entry *dirent;
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char name[BLOCK_SIZE];
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int offset = 0;
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int dir_modified = 0;
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errcode_t retval;
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char *path1, *path2;
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int dot_state;
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blk_t block_nr = db->blk;
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ino_t ino = db->ino;
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static char unknown[] = "???";
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/*
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* Make sure the inode is still in use (could have been
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* deleted in the duplicate/bad blocks pass.
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*/
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if (!(ext2fs_test_inode_bitmap(fs, inode_used_map, ino)))
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return 0;
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if (db->blockcnt)
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dot_state = 2;
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else
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dot_state = 0;
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#if 0
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printf("In process_dir_block block %d, #%d, inode %d\n", block_nr,
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db->blockcnt, ino);
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#endif
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retval = io_channel_read_blk(fs->io, block_nr, 1, buf);
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if (retval) {
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com_err(program_name, retval,
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"while reading directory block %d", block_nr);
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}
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do {
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dot_state++;
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dirent = (struct ext2_dir_entry *) (buf + offset);
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if (((offset + dirent->rec_len) > fs->blocksize) ||
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(dirent->rec_len < 8) ||
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((dirent->name_len+8) > dirent->rec_len)) {
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printf("Directory inode %ld, block %d, offset %d: directory corrupted\n",
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ino, db->blockcnt, offset);
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preenhalt();
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if (ask("Salvage", 1)) {
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dirent->rec_len = fs->blocksize - offset;
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dirent->name_len = 0;
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dirent->inode = 0;
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dir_modified++;
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} else {
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ext2fs_unmark_valid(fs);
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return DIRENT_ABORT;
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}
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}
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strncpy(name, dirent->name, dirent->name_len);
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name[dirent->name_len] = '\0';
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if (dot_state == 1) {
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if (check_dot(fs, dirent, ino))
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dir_modified++;
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} else if (dot_state == 2) {
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dir = get_dir_info(ino);
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if (!dir) {
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printf("Internal error: couldn't find dir_info for %ld\n",
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ino);
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fatal_error(0);
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}
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if (check_dotdot(fs, dirent, dir))
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dir_modified++;
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} else if (dirent->inode == ino) {
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retval = ext2fs_get_pathname(fs, ino, 0, &path1);
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if (retval)
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path1 = unknown;
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printf("Entry '%s' in %s (%ld) is a link to '.' ",
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name, path1, ino);
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if (path1 != unknown)
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free(path1);
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preenhalt();
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if (ask("Clear", 1)) {
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dirent->inode = 0;
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dir_modified++;
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}
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}
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if (!dirent->inode)
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goto next;
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#if 0
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printf("Entry '%s', name_len %d, rec_len %d, inode %d... ",
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name, dirent->name_len, dirent->rec_len, dirent->inode);
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#endif
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if (check_name(fs, dirent, ino, name))
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dir_modified++;
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/*
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* Make sure the inode listed is a legal one.
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*/
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if (((dirent->inode != EXT2_ROOT_INO) &&
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(dirent->inode < EXT2_FIRST_INO)) ||
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(dirent->inode > fs->super->s_inodes_count)) {
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retval = ext2fs_get_pathname(fs, ino, 0, &path1);
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if (retval)
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path1 = unknown;
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printf("Entry '%s' in %s (%ld) has bad inode #: %ld.\n",
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name, path1, ino, dirent->inode);
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if (path1 != unknown)
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free(path1);
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preenhalt();
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if (ask("Clear", 1)) {
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dirent->inode = 0;
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dir_modified++;
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goto next;
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} else
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ext2fs_unmark_valid(fs);
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}
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/*
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* If the inode is unusued, offer to clear it.
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*/
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if (!(ext2fs_test_inode_bitmap(fs, inode_used_map,
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dirent->inode))) {
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retval = ext2fs_get_pathname(fs, ino, 0, &path1);
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if (retval)
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path1 = unknown;
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printf("Entry '%s' in %s (%ld) has deleted/unused inode %ld.\n",
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name, path1, ino, dirent->inode);
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if (path1 != unknown)
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free(path1);
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if (ask("Clear", 1)) {
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dirent->inode = 0;
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dir_modified++;
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goto next;
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} else
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ext2fs_unmark_valid(fs);
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}
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/*
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* If the inode was marked as having bad fields in
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* pass1, process it and offer to fix/clear it.
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* (We wait until now so that we can display the
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* pathname to the user.)
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*/
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if (inode_bad_map &&
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ext2fs_test_inode_bitmap(fs, inode_bad_map,
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dirent->inode)) {
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if (process_bad_inode(fs, ino, dirent->inode)) {
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dirent->inode = 0;
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dir_modified++;
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goto next;
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}
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}
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/*
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* If this is a directory, then mark its parent in its
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* dir_info structure. If the parent field is already
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* filled in, then this directory has more than one
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* hard link. We assume the first link is correct,
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* and ask the user if he/she wants to clear this one.
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*/
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if ((dot_state > 2) &&
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(ext2fs_test_inode_bitmap(fs, inode_dir_map,
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dirent->inode))) {
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subdir = get_dir_info(dirent->inode);
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if (!subdir) {
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printf("INTERNAL ERROR: missing dir %ld\n",
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dirent->inode);
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fatal_error(0);
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}
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if (subdir->parent) {
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retval = ext2fs_get_pathname(fs, ino,
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0, &path1);
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if (retval)
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path1 = unknown;
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retval = ext2fs_get_pathname(fs,
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subdir->parent,
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dirent->inode,
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&path2);
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if (retval)
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path2 = unknown;
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printf("Entry '%s' in %s (%ld) is a link to directory %s (%ld).\n",
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name, path1, ino, path2,
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dirent->inode);
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if (path1 != unknown)
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free(path1);
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if (path2 != unknown)
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free(path2);
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if (ask("Clear", 1)) {
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dirent->inode = 0;
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dir_modified++;
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goto next;
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} else
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ext2fs_unmark_valid(fs);
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}
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subdir->parent = ino;
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}
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if (inode_count[dirent->inode]++ > 0)
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fs_links_count++;
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fs_total_count++;
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next:
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offset += dirent->rec_len;
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} while (offset < fs->blocksize);
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#if 0
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printf("\n");
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#endif
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if (offset != fs->blocksize) {
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printf("Final rec_len is %d, should be %d\n",
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dirent->rec_len,
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dirent->rec_len - fs->blocksize + offset);
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}
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if (dir_modified) {
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retval = io_channel_write_blk(fs->io, block_nr,
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1, buf);
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if (retval) {
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com_err(program_name, retval,
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"while writing directory block %d", block_nr);
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}
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ext2fs_mark_changed(fs);
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}
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return 0;
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}
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/*
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* This function is called to deallocate a block, and is an interator
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* functioned called by deallocate inode via ext2fs_iterate_block().
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*/
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static int deallocate_inode_block(ext2_filsys fs,
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blk_t *block_nr,
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int blockcnt,
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void *private)
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{
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if (!*block_nr)
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return 0;
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ext2fs_unmark_block_bitmap(fs, block_found_map, *block_nr);
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ext2fs_unmark_block_bitmap(fs, fs->block_map, *block_nr);
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return 0;
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}
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/*
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* This fuction deallocates an inode
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*/
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static void deallocate_inode(ext2_filsys fs, ino_t ino,
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char* block_buf)
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{
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errcode_t retval;
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struct ext2_inode inode;
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval) {
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com_err("deallocate_inode", retval, "while reading inode %d",
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ino);
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return;
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}
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inode.i_links_count = 0;
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inode.i_dtime = time(0);
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retval = ext2fs_write_inode(fs, ino, &inode);
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if (retval) {
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com_err("deallocate_inode", retval, "while writing inode %d",
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ino);
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return;
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}
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/*
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* Fix up the bitmaps...
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*/
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read_bitmaps(fs);
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ext2fs_unmark_inode_bitmap(fs, inode_used_map, ino);
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ext2fs_unmark_inode_bitmap(fs, inode_dir_map, ino);
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if (inode_bad_map)
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ext2fs_unmark_inode_bitmap(fs, inode_bad_map, ino);
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ext2fs_unmark_inode_bitmap(fs, fs->inode_map, ino);
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ext2fs_mark_ib_dirty(fs);
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if (!inode_has_valid_blocks(&inode))
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return;
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ext2fs_mark_bb_dirty(fs);
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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);
|
|
}
|
|
|
|
/*
|
|
* These two subroutines are used by process_bad_inode; it is used to
|
|
* make sure that certain reserved fields are really zero. If not,
|
|
* prompt the user if he/she wants us to zeroize them.
|
|
*/
|
|
static void check_for_zero_long(ext2_filsys fs, ino_t ino, char *pathname,
|
|
const char *name, unsigned long *val,
|
|
int *modified)
|
|
{
|
|
char prompt[80];
|
|
|
|
if (*val) {
|
|
printf("%s for inode %ld (%s) is %ld, should be zero.\n",
|
|
name, ino, pathname, *val);
|
|
preenhalt();
|
|
sprintf(prompt, "Clear %s", name);
|
|
if (ask(prompt, 1)) {
|
|
*val = 0;
|
|
*modified = 1;
|
|
} else
|
|
ext2fs_unmark_valid(fs);
|
|
}
|
|
}
|
|
|
|
static void check_for_zero_char(ext2_filsys fs, ino_t ino, char *pathname,
|
|
const char *name, unsigned char *val,
|
|
int *modified)
|
|
{
|
|
char prompt[80];
|
|
|
|
if (*val) {
|
|
printf("%s for inode %ld (%s) is %d, should be zero.\n",
|
|
name, ino, pathname, *val);
|
|
preenhalt();
|
|
sprintf(prompt, "Clear %s", name);
|
|
if (ask(prompt, 1)) {
|
|
*val = 0;
|
|
*modified = 1;
|
|
} else
|
|
ext2fs_unmark_valid(fs);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static int process_bad_inode(ext2_filsys fs, ino_t dir, ino_t ino)
|
|
{
|
|
struct ext2_inode inode;
|
|
errcode_t retval;
|
|
int inode_modified = 0;
|
|
char *pathname;
|
|
|
|
retval = ext2fs_read_inode(fs, ino, &inode);
|
|
if (retval) {
|
|
com_err("process_bad_inode", retval, "while reading inode %d",
|
|
ino);
|
|
return 0;
|
|
}
|
|
retval = ext2fs_get_pathname(fs, dir, ino, &pathname);
|
|
if (retval) {
|
|
com_err("process_bad_inode", retval,
|
|
"while getting pathname for inode %d",
|
|
ino);
|
|
return 0;
|
|
}
|
|
if (!S_ISDIR(inode.i_mode) && !S_ISREG(inode.i_mode) &&
|
|
!S_ISCHR(inode.i_mode) && !S_ISBLK(inode.i_mode) &&
|
|
!S_ISLNK(inode.i_mode) && !S_ISFIFO(inode.i_mode) &&
|
|
!(S_ISSOCK(inode.i_mode))) {
|
|
printf("Inode %ld (%s) has a bad mode (0%o).\n",
|
|
ino, pathname, inode.i_mode);
|
|
preenhalt();
|
|
if (ask("Clear", 1)) {
|
|
deallocate_inode(fs, ino, 0);
|
|
return 1;
|
|
} else
|
|
ext2fs_unmark_valid(fs);
|
|
}
|
|
check_for_zero_long(fs, ino, pathname, "i_faddr", &inode.i_faddr,
|
|
&inode_modified);
|
|
check_for_zero_char(fs, ino, pathname, "i_frag", &inode.i_frag,
|
|
&inode_modified);
|
|
check_for_zero_char(fs, ino, pathname, "i_fsize", &inode.i_fsize,
|
|
&inode_modified);
|
|
check_for_zero_long(fs, ino, pathname, "i_file_acl", &inode.i_file_acl,
|
|
&inode_modified);
|
|
check_for_zero_long(fs, ino, pathname, "i_dir_acl", &inode.i_dir_acl,
|
|
&inode_modified);
|
|
free(pathname);
|
|
if (inode_modified) {
|
|
retval = ext2fs_write_inode(fs, ino, &inode);
|
|
if (retval) {
|
|
com_err("process_bad_inode", retval,
|
|
"while writing inode %d",
|
|
ino);
|
|
return 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|