blob: c6aff71a53a899917407e1469b08e358d5c91539 [file] [log] [blame]
/*
* 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
* - The inode_reg_map bitmap
*/
#define _GNU_SOURCE 1 /* get strnlen() */
#include "config.h"
#include <string.h>
#include "e2fsck.h"
#include "problem.h"
#include "support/dict.h"
#ifdef NO_INLINE_FUNCS
#define _INLINE_
#else
#define _INLINE_ inline
#endif
/* #define DX_DEBUG */
/*
* Keeps track of how many times an inode is referenced.
*/
static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf);
static int check_dir_block2(ext2_filsys fs,
struct ext2_db_entry2 *dir_blocks_info,
void *priv_data);
static int check_dir_block(ext2_filsys fs,
struct ext2_db_entry2 *dir_blocks_info,
void *priv_data);
static int allocate_dir_block(e2fsck_t ctx,
struct ext2_db_entry2 *dir_blocks_info,
char *buf, struct problem_context *pctx);
static void clear_htree(e2fsck_t ctx, ext2_ino_t ino);
static int htree_depth(struct dx_dir_info *dx_dir,
struct dx_dirblock_info *dx_db);
static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b);
struct check_dir_struct {
char *buf;
struct problem_context pctx;
int count, max;
e2fsck_t ctx;
unsigned long long list_offset;
unsigned long long ra_entries;
unsigned long long next_ra_off;
};
static void update_parents(struct dx_dir_info *dx_dir, int type)
{
struct dx_dirblock_info *dx_db, *dx_parent, *dx_previous;
int b;
for (b = 0, dx_db = dx_dir->dx_block;
b < dx_dir->numblocks;
b++, dx_db++) {
dx_parent = &dx_dir->dx_block[dx_db->parent];
if (dx_db->type != type)
continue;
/*
* XXX Make sure dx_parent->min_hash > dx_db->min_hash
*/
if (dx_db->flags & DX_FLAG_FIRST) {
dx_parent->min_hash = dx_db->min_hash;
if (dx_parent->previous) {
dx_previous =
&dx_dir->dx_block[dx_parent->previous];
dx_previous->node_max_hash =
dx_parent->min_hash;
}
}
/*
* XXX Make sure dx_parent->max_hash < dx_db->max_hash
*/
if (dx_db->flags & DX_FLAG_LAST) {
dx_parent->max_hash = dx_db->max_hash;
}
}
}
void e2fsck_pass2(e2fsck_t ctx)
{
struct ext2_super_block *sb = ctx->fs->super;
struct problem_context pctx;
ext2_filsys fs = ctx->fs;
char *buf = NULL;
#ifdef RESOURCE_TRACK
struct resource_track rtrack;
#endif
struct check_dir_struct cd;
struct dx_dir_info *dx_dir;
struct dx_dirblock_info *dx_db, *dx_parent;
int b;
int i, depth;
problem_t code;
int bad_dir;
int (*check_dir_func)(ext2_filsys fs,
struct ext2_db_entry2 *dir_blocks_info,
void *priv_data);
init_resource_track(&rtrack, ctx->fs->io);
clear_problem_context(&cd.pctx);
#ifdef MTRACE
mtrace_print("Pass 2");
#endif
if (!(ctx->options & E2F_OPT_PREEN))
fix_problem(ctx, PR_2_PASS_HEADER, &cd.pctx);
cd.pctx.errcode = e2fsck_setup_icount(ctx, "inode_count",
EXT2_ICOUNT_OPT_INCREMENT,
ctx->inode_link_info, &ctx->inode_count);
if (cd.pctx.errcode) {
fix_problem(ctx, PR_2_ALLOCATE_ICOUNT, &cd.pctx);
ctx->flags |= E2F_FLAG_ABORT;
goto cleanup;
}
buf = (char *) e2fsck_allocate_memory(ctx, 2*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.)
*/
(void) e2fsck_dir_info_set_parent(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO);
cd.buf = buf;
cd.ctx = ctx;
cd.count = 1;
cd.max = ext2fs_dblist_count2(fs->dblist);
cd.list_offset = 0;
cd.ra_entries = ctx->readahead_kb * 1024 / ctx->fs->blocksize;
cd.next_ra_off = 0;
if (ctx->progress)
(void) (ctx->progress)(ctx, 2, 0, cd.max);
if (ext2fs_has_feature_dir_index(fs->super))
ext2fs_dblist_sort2(fs->dblist, special_dir_block_cmp);
check_dir_func = cd.ra_entries ? check_dir_block2 : check_dir_block;
cd.pctx.errcode = ext2fs_dblist_iterate2(fs->dblist, check_dir_func,
&cd);
if (ctx->flags & E2F_FLAG_RESTART_LATER) {
ctx->flags |= E2F_FLAG_RESTART;
ctx->flags &= ~E2F_FLAG_RESTART_LATER;
}
if (ctx->flags & E2F_FLAG_RUN_RETURN)
goto cleanup;
if (cd.pctx.errcode) {
fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
ctx->flags |= E2F_FLAG_ABORT;
goto cleanup;
}
for (i=0; (dx_dir = e2fsck_dx_dir_info_iter(ctx, &i)) != 0;) {
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
goto cleanup;
if (e2fsck_dir_will_be_rehashed(ctx, dx_dir->ino) ||
dx_dir->numblocks == 0)
continue;
clear_problem_context(&pctx);
bad_dir = 0;
pctx.dir = dx_dir->ino;
dx_db = dx_dir->dx_block;
if (dx_db->flags & DX_FLAG_REFERENCED)
dx_db->flags |= DX_FLAG_DUP_REF;
else
dx_db->flags |= DX_FLAG_REFERENCED;
/*
* Find all of the first and last leaf blocks, and
* update their parent's min and max hash values
*/
update_parents(dx_dir, DX_DIRBLOCK_LEAF);
/* for 3 level htree: update 2 level parent's min
* and max hash values */
update_parents(dx_dir, DX_DIRBLOCK_NODE);
for (b=0, dx_db = dx_dir->dx_block;
b < dx_dir->numblocks;
b++, dx_db++) {
pctx.blkcount = b;
pctx.group = dx_db->parent;
code = 0;
if (!(dx_db->flags & DX_FLAG_FIRST) &&
(dx_db->min_hash < dx_db->node_min_hash)) {
pctx.blk = dx_db->min_hash;
pctx.blk2 = dx_db->node_min_hash;
code = PR_2_HTREE_MIN_HASH;
fix_problem(ctx, code, &pctx);
bad_dir++;
}
if (dx_db->type == DX_DIRBLOCK_LEAF) {
depth = htree_depth(dx_dir, dx_db);
if (depth != dx_dir->depth) {
pctx.num = dx_dir->depth;
code = PR_2_HTREE_BAD_DEPTH;
fix_problem(ctx, code, &pctx);
bad_dir++;
}
}
/*
* This test doesn't apply for the root block
* at block #0
*/
if (b &&
(dx_db->max_hash > dx_db->node_max_hash)) {
pctx.blk = dx_db->max_hash;
pctx.blk2 = dx_db->node_max_hash;
code = PR_2_HTREE_MAX_HASH;
fix_problem(ctx, code, &pctx);
bad_dir++;
}
if (!(dx_db->flags & DX_FLAG_REFERENCED)) {
code = PR_2_HTREE_NOTREF;
fix_problem(ctx, code, &pctx);
bad_dir++;
} else if (dx_db->flags & DX_FLAG_DUP_REF) {
code = PR_2_HTREE_DUPREF;
fix_problem(ctx, code, &pctx);
bad_dir++;
}
}
if (bad_dir && fix_problem(ctx, PR_2_HTREE_CLEAR, &pctx)) {
clear_htree(ctx, dx_dir->ino);
dx_dir->numblocks = 0;
}
}
e2fsck_free_dx_dir_info(ctx);
ext2fs_free_mem(&buf);
ext2fs_free_dblist(fs->dblist);
if (ctx->inode_bad_map) {
ext2fs_free_inode_bitmap(ctx->inode_bad_map);
ctx->inode_bad_map = 0;
}
if (ctx->inode_reg_map) {
ext2fs_free_inode_bitmap(ctx->inode_reg_map);
ctx->inode_reg_map = 0;
}
if (ctx->encrypted_dirs) {
ext2fs_u32_list_free(ctx->encrypted_dirs);
ctx->encrypted_dirs = 0;
}
clear_problem_context(&pctx);
if (ctx->large_files) {
if (!ext2fs_has_feature_large_file(sb) &&
fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
ext2fs_set_feature_large_file(sb);
fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
ext2fs_mark_super_dirty(fs);
}
if (sb->s_rev_level == EXT2_GOOD_OLD_REV &&
fix_problem(ctx, PR_1_FS_REV_LEVEL, &pctx)) {
ext2fs_update_dynamic_rev(fs);
ext2fs_mark_super_dirty(fs);
}
}
print_resource_track(ctx, _("Pass 2"), &rtrack, fs->io);
cleanup:
ext2fs_free_mem(&buf);
}
#define MAX_DEPTH 32000
static int htree_depth(struct dx_dir_info *dx_dir,
struct dx_dirblock_info *dx_db)
{
int depth = 0;
while (dx_db->type != DX_DIRBLOCK_ROOT && depth < MAX_DEPTH) {
dx_db = &dx_dir->dx_block[dx_db->parent];
depth++;
}
return depth;
}
static int dict_de_cmp(const void *a, const void *b)
{
const struct ext2_dir_entry *de_a, *de_b;
int a_len, b_len;
de_a = (const struct ext2_dir_entry *) a;
a_len = ext2fs_dirent_name_len(de_a);
de_b = (const struct ext2_dir_entry *) b;
b_len = ext2fs_dirent_name_len(de_b);
if (a_len != b_len)
return (a_len - b_len);
return memcmp(de_a->name, de_b->name, a_len);
}
/*
* This is special sort function that makes sure that directory blocks
* with a dirblock of zero are sorted to the beginning of the list.
* This guarantees that the root node of the htree directories are
* processed first, so we know what hash version to use.
*/
static EXT2_QSORT_TYPE special_dir_block_cmp(const void *a, const void *b)
{
const struct ext2_db_entry2 *db_a =
(const struct ext2_db_entry2 *) a;
const struct ext2_db_entry2 *db_b =
(const struct ext2_db_entry2 *) b;
if (db_a->blockcnt && !db_b->blockcnt)
return 1;
if (!db_a->blockcnt && db_b->blockcnt)
return -1;
if (db_a->blk != db_b->blk)
return (int) (db_a->blk - db_b->blk);
if (db_a->ino != db_b->ino)
return (int) (db_a->ino - db_b->ino);
return (int) (db_a->blockcnt - db_b->blockcnt);
}
/*
* Make sure the first entry in the directory is '.', and that the
* directory entry is sane.
*/
static int check_dot(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
ext2_ino_t ino, struct problem_context *pctx)
{
struct ext2_dir_entry *nextdir;
unsigned int rec_len, new_len;
int status = 0;
int created = 0;
problem_t problem = 0;
if (!dirent->inode)
problem = PR_2_MISSING_DOT;
else if ((ext2fs_dirent_name_len(dirent) != 1) ||
(dirent->name[0] != '.'))
problem = PR_2_1ST_NOT_DOT;
else if (dirent->name[1] != '\0')
problem = PR_2_DOT_NULL_TERM;
(void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
if (problem) {
if (fix_problem(ctx, problem, pctx)) {
if (rec_len < 12)
rec_len = dirent->rec_len = 12;
dirent->inode = ino;
ext2fs_dirent_set_name_len(dirent, 1);
ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
dirent->name[0] = '.';
dirent->name[1] = '\0';
status = 1;
created = 1;
}
}
if (dirent->inode != ino) {
if (fix_problem(ctx, PR_2_BAD_INODE_DOT, pctx)) {
dirent->inode = ino;
status = 1;
}
}
if (rec_len > 12) {
new_len = rec_len - 12;
if (new_len > 12) {
if (created ||
fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
nextdir = (struct ext2_dir_entry *)
((char *) dirent + 12);
dirent->rec_len = 12;
(void) ext2fs_set_rec_len(ctx->fs, new_len,
nextdir);
nextdir->inode = 0;
ext2fs_dirent_set_name_len(nextdir, 0);
ext2fs_dirent_set_file_type(nextdir,
EXT2_FT_UNKNOWN);
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(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
ext2_ino_t ino, struct problem_context *pctx)
{
problem_t problem = 0;
unsigned int rec_len;
if (!dirent->inode)
problem = PR_2_MISSING_DOT_DOT;
else if ((ext2fs_dirent_name_len(dirent) != 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;
(void) ext2fs_get_rec_len(ctx->fs, dirent, &rec_len);
if (problem) {
if (fix_problem(ctx, problem, pctx)) {
if (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;
ext2fs_dirent_set_name_len(dirent, 2);
ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
dirent->name[0] = '.';
dirent->name[1] = '.';
dirent->name[2] = '\0';
return 1;
}
return 0;
}
if (e2fsck_dir_info_set_dotdot(ctx, ino, dirent->inode)) {
fix_problem(ctx, PR_2_NO_DIRINFO, pctx);
return -1;
}
return 0;
}
/*
* Check to make sure a directory entry doesn't contain any illegal
* characters.
*/
static int check_name(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
struct problem_context *pctx)
{
int i;
int fixup = -1;
int ret = 0;
for ( i = 0; i < ext2fs_dirent_name_len(dirent); i++) {
if (dirent->name[i] != '/' && dirent->name[i] != '\0')
continue;
if (fixup < 0)
fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
if (fixup == 0)
return 0;
dirent->name[i] = '.';
ret = 1;
}
return ret;
}
static int encrypted_check_name(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
struct problem_context *pctx)
{
if (ext2fs_dirent_name_len(dirent) < EXT4_CRYPTO_BLOCK_SIZE) {
if (fix_problem(ctx, PR_2_BAD_ENCRYPTED_NAME, pctx)) {
dirent->inode = 0;
return 1;
}
ext2fs_unmark_valid(ctx->fs);
}
return 0;
}
/*
* Check the directory filetype (if present)
*/
static _INLINE_ int check_filetype(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
struct problem_context *pctx)
{
int filetype = ext2fs_dirent_file_type(dirent);
int should_be = EXT2_FT_UNKNOWN;
struct ext2_inode inode;
if (!ext2fs_has_feature_filetype(ctx->fs->super)) {
if (filetype == 0 ||
!fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
return 0;
ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
return 1;
}
if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dirent->inode)) {
should_be = EXT2_FT_DIR;
} else if (ext2fs_test_inode_bitmap2(ctx->inode_reg_map,
dirent->inode)) {
should_be = EXT2_FT_REG_FILE;
} else if (ctx->inode_bad_map &&
ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
dirent->inode))
should_be = 0;
else {
e2fsck_read_inode(ctx, dirent->inode, &inode,
"check_filetype");
should_be = ext2_file_type(inode.i_mode);
}
if (filetype == should_be)
return 0;
pctx->num = should_be;
if (fix_problem(ctx, filetype ? PR_2_BAD_FILETYPE : PR_2_SET_FILETYPE,
pctx) == 0)
return 0;
ext2fs_dirent_set_file_type(dirent, should_be);
return 1;
}
static void parse_int_node(ext2_filsys fs,
struct ext2_db_entry2 *db,
struct check_dir_struct *cd,
struct dx_dir_info *dx_dir,
char *block_buf, int failed_csum)
{
struct ext2_dx_root_info *root;
struct ext2_dx_entry *ent;
struct ext2_dx_countlimit *limit;
struct dx_dirblock_info *dx_db;
int i, expect_limit, count;
blk_t blk;
ext2_dirhash_t min_hash = 0xffffffff;
ext2_dirhash_t max_hash = 0;
ext2_dirhash_t hash = 0, prev_hash;
int csum_size = 0;
if (db->blockcnt == 0) {
root = (struct ext2_dx_root_info *) (block_buf + 24);
#ifdef DX_DEBUG
printf("Root node dump:\n");
printf("\t Reserved zero: %u\n", root->reserved_zero);
printf("\t Hash Version: %d\n", root->hash_version);
printf("\t Info length: %d\n", root->info_length);
printf("\t Indirect levels: %d\n", root->indirect_levels);
printf("\t Flags: %d\n", root->unused_flags);
#endif
ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
if (failed_csum &&
(e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
fix_problem(cd->ctx, PR_2_HTREE_ROOT_CSUM_INVALID,
&cd->pctx)))
goto clear_and_exit;
} else {
ent = (struct ext2_dx_entry *) (block_buf+8);
if (failed_csum &&
(e2fsck_dir_will_be_rehashed(cd->ctx, cd->pctx.ino) ||
fix_problem(cd->ctx, PR_2_HTREE_NODE_CSUM_INVALID,
&cd->pctx)))
goto clear_and_exit;
}
limit = (struct ext2_dx_countlimit *) ent;
#ifdef DX_DEBUG
printf("Number of entries (count): %d\n",
ext2fs_le16_to_cpu(limit->count));
printf("Number of entries (limit): %d\n",
ext2fs_le16_to_cpu(limit->limit));
#endif
count = ext2fs_le16_to_cpu(limit->count);
if (ext2fs_has_feature_metadata_csum(fs->super))
csum_size = sizeof(struct ext2_dx_tail);
expect_limit = (fs->blocksize -
(csum_size + ((char *) ent - block_buf))) /
sizeof(struct ext2_dx_entry);
if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
goto clear_and_exit;
}
if (count > expect_limit) {
cd->pctx.num = count;
if (fix_problem(cd->ctx, PR_2_HTREE_BAD_COUNT, &cd->pctx))
goto clear_and_exit;
count = expect_limit;
}
for (i=0; i < count; i++) {
prev_hash = hash;
hash = i ? (ext2fs_le32_to_cpu(ent[i].hash) & ~1) : 0;
#ifdef DX_DEBUG
printf("Entry #%d: Hash 0x%08x, block %u\n", i,
hash, ext2fs_le32_to_cpu(ent[i].block));
#endif
blk = ext2fs_le32_to_cpu(ent[i].block) & EXT4_DX_BLOCK_MASK;
/* Check to make sure the block is valid */
if (blk >= (blk_t) dx_dir->numblocks) {
cd->pctx.blk = blk;
if (fix_problem(cd->ctx, PR_2_HTREE_BADBLK,
&cd->pctx))
goto clear_and_exit;
continue;
}
if (hash < prev_hash &&
fix_problem(cd->ctx, PR_2_HTREE_HASH_ORDER, &cd->pctx))
goto clear_and_exit;
dx_db = &dx_dir->dx_block[blk];
if (dx_db->flags & DX_FLAG_REFERENCED) {
dx_db->flags |= DX_FLAG_DUP_REF;
} else {
dx_db->flags |= DX_FLAG_REFERENCED;
dx_db->parent = db->blockcnt;
}
dx_db->previous =
i ? (ext2fs_le32_to_cpu(ent[i-1].block) &
EXT4_DX_BLOCK_MASK) : 0;
if (hash < min_hash)
min_hash = hash;
if (hash > max_hash)
max_hash = hash;
dx_db->node_min_hash = hash;
if ((i+1) < count)
dx_db->node_max_hash =
ext2fs_le32_to_cpu(ent[i+1].hash) & ~1;
else {
dx_db->node_max_hash = 0xfffffffe;
dx_db->flags |= DX_FLAG_LAST;
}
if (i == 0)
dx_db->flags |= DX_FLAG_FIRST;
}
#ifdef DX_DEBUG
printf("Blockcnt = %d, min hash 0x%08x, max hash 0x%08x\n",
db->blockcnt, min_hash, max_hash);
#endif
dx_db = &dx_dir->dx_block[db->blockcnt];
dx_db->min_hash = min_hash;
dx_db->max_hash = max_hash;
return;
clear_and_exit:
clear_htree(cd->ctx, cd->pctx.ino);
dx_dir->numblocks = 0;
e2fsck_rehash_dir_later(cd->ctx, cd->pctx.ino);
}
/*
* Given a busted directory, try to salvage it somehow.
*
*/
static void salvage_directory(ext2_filsys fs,
struct ext2_dir_entry *dirent,
struct ext2_dir_entry *prev,
unsigned int *offset,
unsigned int block_len)
{
char *cp = (char *) dirent;
int left;
unsigned int rec_len, prev_rec_len;
unsigned int name_len;
/*
* If the space left for the entry is too small to be an entry,
* we can't access dirent's fields, so plumb in the values needed
* so that the previous entry absorbs this one.
*/
if (block_len - *offset < EXT2_DIR_ENTRY_HEADER_LEN) {
name_len = 0;
rec_len = block_len - *offset;
} else {
name_len = ext2fs_dirent_name_len(dirent);
(void) ext2fs_get_rec_len(fs, dirent, &rec_len);
}
left = block_len - *offset - rec_len;
/*
* Special case of directory entry of size 8: copy what's left
* of the directory block up to cover up the invalid hole.
*/
if ((left >= 12) && (rec_len == EXT2_DIR_ENTRY_HEADER_LEN)) {
memmove(cp, cp+EXT2_DIR_ENTRY_HEADER_LEN, left);
memset(cp + left, 0, EXT2_DIR_ENTRY_HEADER_LEN);
return;
}
/*
* If the directory entry overruns the end of the directory
* block, and the name is small enough to fit, then adjust the
* record length.
*/
if ((left < 0) &&
((int) rec_len + left > EXT2_DIR_ENTRY_HEADER_LEN) &&
((int) name_len + EXT2_DIR_ENTRY_HEADER_LEN <= (int) rec_len + left) &&
dirent->inode <= fs->super->s_inodes_count &&
strnlen(dirent->name, name_len) == name_len) {
(void) ext2fs_set_rec_len(fs, (int) rec_len + left, dirent);
return;
}
/*
* If the record length of the directory entry is a multiple
* of four, and not too big, such that it is valid, let the
* previous directory entry absorb the invalid one.
*/
if (prev && rec_len && (rec_len % 4) == 0 &&
(*offset + rec_len <= block_len)) {
(void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
prev_rec_len += rec_len;
(void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
*offset += rec_len;
return;
}
/*
* Default salvage method --- kill all of the directory
* entries for the rest of the block. We will either try to
* absorb it into the previous directory entry, or create a
* new empty directory entry the rest of the directory block.
*/
if (prev) {
(void) ext2fs_get_rec_len(fs, prev, &prev_rec_len);
prev_rec_len += block_len - *offset;
(void) ext2fs_set_rec_len(fs, prev_rec_len, prev);
*offset = fs->blocksize;
} else {
rec_len = block_len - *offset;
(void) ext2fs_set_rec_len(fs, rec_len, dirent);
ext2fs_dirent_set_name_len(dirent, 0);
ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN);
dirent->inode = 0;
}
}
#define NEXT_DIRENT(d) ((void *)((char *)(d) + (d)->rec_len))
static errcode_t insert_dirent_tail(ext2_filsys fs, void *dirbuf)
{
struct ext2_dir_entry *d;
void *top;
struct ext2_dir_entry_tail *t;
d = dirbuf;
top = EXT2_DIRENT_TAIL(dirbuf, fs->blocksize);
while (d->rec_len && !(d->rec_len & 0x3) && NEXT_DIRENT(d) <= top)
d = NEXT_DIRENT(d);
if (d != top) {
unsigned int min_size = EXT2_DIR_REC_LEN(
ext2fs_dirent_name_len(dirbuf));
if (min_size > (char *)top - (char *)d)
return EXT2_ET_DIR_NO_SPACE_FOR_CSUM;
d->rec_len = (char *)top - (char *)d;
}
t = (struct ext2_dir_entry_tail *)top;
if (t->det_reserved_zero1 ||
t->det_rec_len != sizeof(struct ext2_dir_entry_tail) ||
t->det_reserved_name_len != EXT2_DIR_NAME_LEN_CSUM)
ext2fs_initialize_dirent_tail(fs, t);
return 0;
}
#undef NEXT_DIRENT
static errcode_t fix_inline_dir_size(e2fsck_t ctx, ext2_ino_t ino,
size_t *inline_data_size,
struct problem_context *pctx,
char *buf)
{
ext2_filsys fs = ctx->fs;
struct ext2_inode inode;
size_t new_size, old_size;
errcode_t retval;
old_size = *inline_data_size;
/*
* If there's not enough bytes to start the "second" dir block
* (in the EA space) then truncate everything to the first block.
*/
if (old_size > EXT4_MIN_INLINE_DATA_SIZE &&
old_size < EXT4_MIN_INLINE_DATA_SIZE +
EXT2_DIR_REC_LEN(1)) {
old_size = EXT4_MIN_INLINE_DATA_SIZE;
new_size = old_size;
} else
/* Increase to the next four-byte boundary for salvaging */
new_size = old_size + (4 - (old_size & 3));
memset(buf + old_size, 0, new_size - old_size);
retval = ext2fs_inline_data_set(fs, ino, 0, buf, new_size);
if (retval == EXT2_ET_INLINE_DATA_NO_SPACE) {
/* Or we can't, so truncate. */
new_size -= 4;
retval = ext2fs_inline_data_set(fs, ino, 0, buf, new_size);
if (retval) {
if (fix_problem(ctx, PR_2_FIX_INLINE_DIR_FAILED,
pctx)) {
new_size = 0;
goto write_inode;
}
goto err;
}
} else if (retval) {
if (fix_problem(ctx, PR_2_FIX_INLINE_DIR_FAILED,
pctx)) {
new_size = 0;
goto write_inode;
}
goto err;
}
write_inode:
retval = ext2fs_read_inode(fs, ino, &inode);
if (retval)
goto err;
retval = ext2fs_inode_size_set(fs, &inode, new_size);
if (retval)
goto err;
if (new_size == 0)
inode.i_flags &= ~EXT4_INLINE_DATA_FL;
retval = ext2fs_write_inode(fs, ino, &inode);
if (retval)
goto err;
*inline_data_size = new_size;
err:
return retval;
}
static int check_dir_block2(ext2_filsys fs,
struct ext2_db_entry2 *db,
void *priv_data)
{
int err;
struct check_dir_struct *cd = priv_data;
if (cd->ra_entries && cd->list_offset >= cd->next_ra_off) {
err = e2fsck_readahead_dblist(fs,
E2FSCK_RA_DBLIST_IGNORE_BLOCKCNT,
fs->dblist,
cd->list_offset + cd->ra_entries / 8,
cd->ra_entries);
if (err)
cd->ra_entries = 0;
cd->next_ra_off = cd->list_offset + (cd->ra_entries * 7 / 8);
}
err = check_dir_block(fs, db, priv_data);
cd->list_offset++;
return err;
}
static int check_dir_block(ext2_filsys fs,
struct ext2_db_entry2 *db,
void *priv_data)
{
struct dx_dir_info *dx_dir;
struct dx_dirblock_info *dx_db = 0;
struct ext2_dir_entry *dirent, *prev, dot, dotdot;
ext2_dirhash_t hash;
unsigned int offset = 0;
int dir_modified = 0;
int dot_state;
unsigned int rec_len;
blk64_t block_nr = db->blk;
ext2_ino_t ino = db->ino;
ext2_ino_t subdir_parent;
__u16 links;
struct check_dir_struct *cd;
char *buf, *ibuf;
e2fsck_t ctx;
problem_t problem;
struct ext2_dx_root_info *root;
struct ext2_dx_countlimit *limit;
static dict_t de_dict;
struct problem_context pctx;
int dups_found = 0;
int ret;
int dx_csum_size = 0, de_csum_size = 0;
int failed_csum = 0;
int is_leaf = 1;
size_t inline_data_size = 0;
int filetype = 0;
int encrypted = 0;
size_t max_block_size;
cd = (struct check_dir_struct *) priv_data;
ibuf = buf = cd->buf;
ctx = cd->ctx;
if (ctx->flags & E2F_FLAG_RUN_RETURN)
return DIRENT_ABORT;
if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
return DIRENT_ABORT;
if (ext2fs_has_feature_metadata_csum(fs->super)) {
dx_csum_size = sizeof(struct ext2_dx_tail);
de_csum_size = sizeof(struct ext2_dir_entry_tail);
}
if (ext2fs_has_feature_filetype(fs->super))
filetype = EXT2_FT_DIR << 8;
/*
* Make sure the inode is still in use (could have been
* deleted in the duplicate/bad blocks pass.
*/
if (!(ext2fs_test_inode_bitmap2(ctx->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 (ext2fs_has_feature_inline_data(fs->super)) {
errcode_t ec;
ec = ext2fs_inline_data_size(fs, ino, &inline_data_size);
if (ec && ec != EXT2_ET_NO_INLINE_DATA)
return DIRENT_ABORT;
}
/* This will allow (at some point in the future) to punch out empty
* directory blocks and reduce the space used by a directory that grows
* very large and then the files are deleted. For now, all that is
* needed is to avoid e2fsck filling in these holes as part of
* feature flag. */
if (db->blk == 0 && ext2fs_has_feature_largedir(fs->super))
return 0;
if (db->blk == 0 && !inline_data_size) {
if (allocate_dir_block(ctx, db, buf, &cd->pctx))
return 0;
block_nr = db->blk;
}
if (db->blockcnt)
dot_state = 2;
else
dot_state = 0;
if (ctx->dirs_to_hash &&
ext2fs_u32_list_test(ctx->dirs_to_hash, ino))
dups_found++;
#if 0
printf("In process_dir_block block %lu, #%d, inode %lu\n", block_nr,
db->blockcnt, ino);
#endif
ehandler_operation(_("reading directory block"));
if (inline_data_size) {
memset(buf, 0, fs->blocksize - inline_data_size);
cd->pctx.errcode = ext2fs_inline_data_get(fs, ino, 0, buf, 0);
if (cd->pctx.errcode)
goto inline_read_fail;
#ifdef WORDS_BIGENDIAN
if (db->blockcnt)
goto skip_first_read_swab;
*((__u32 *)buf) = ext2fs_le32_to_cpu(*((__u32 *)buf));
cd->pctx.errcode = ext2fs_dirent_swab_in2(fs,
buf + EXT4_INLINE_DATA_DOTDOT_SIZE,
EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE,
0);
if (cd->pctx.errcode)
goto inline_read_fail;
skip_first_read_swab:
if (inline_data_size <= EXT4_MIN_INLINE_DATA_SIZE ||
!db->blockcnt)
goto inline_read_fail;
cd->pctx.errcode = ext2fs_dirent_swab_in2(fs,
buf + EXT4_MIN_INLINE_DATA_SIZE,
inline_data_size - EXT4_MIN_INLINE_DATA_SIZE,
0);
#endif
} else
cd->pctx.errcode = ext2fs_read_dir_block4(fs, block_nr,
buf, 0, ino);
inline_read_fail:
pctx.ino = ino;
pctx.num = inline_data_size;
if (((inline_data_size & 3) ||
(inline_data_size > EXT4_MIN_INLINE_DATA_SIZE &&
inline_data_size < EXT4_MIN_INLINE_DATA_SIZE +
EXT2_DIR_REC_LEN(1))) &&
fix_problem(ctx, PR_2_BAD_INLINE_DIR_SIZE, &pctx)) {
errcode_t err = fix_inline_dir_size(ctx, ino,
&inline_data_size, &pctx,
buf);
if (err)
return DIRENT_ABORT;
}
ehandler_operation(0);
if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
cd->pctx.errcode = 0; /* We'll handle this ourselves */
else if (cd->pctx.errcode == EXT2_ET_DIR_CSUM_INVALID) {
cd->pctx.errcode = 0; /* We'll handle this ourselves */
failed_csum = 1;
}
if (cd->pctx.errcode) {
char *buf2;
if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
ctx->flags |= E2F_FLAG_ABORT;
return DIRENT_ABORT;
}
ext2fs_new_dir_block(fs, db->blockcnt == 0 ? ino : 0,
EXT2_ROOT_INO, &buf2);
memcpy(buf, buf2, fs->blocksize);
ext2fs_free_mem(&buf2);
}
dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
if (dx_dir && dx_dir->numblocks) {
if (db->blockcnt >= dx_dir->numblocks) {
pctx.dir = ino;
if (fix_problem(ctx, PR_2_UNEXPECTED_HTREE_BLOCK,
&pctx)) {
clear_htree(ctx, ino);
dx_dir->numblocks = 0;
dx_db = 0;
goto out_htree;
}
fatal_error(ctx, _("Can not continue."));
}
dx_db = &dx_dir->dx_block[db->blockcnt];
dx_db->type = DX_DIRBLOCK_LEAF;
dx_db->phys = block_nr;
dx_db->min_hash = ~0;
dx_db->max_hash = 0;
dirent = (struct ext2_dir_entry *) buf;
(void) ext2fs_get_rec_len(fs, dirent, &rec_len);
limit = (struct ext2_dx_countlimit *) (buf+8);
if (db->blockcnt == 0) {
root = (struct ext2_dx_root_info *) (buf + 24);
dx_db->type = DX_DIRBLOCK_ROOT;
dx_db->flags |= DX_FLAG_FIRST | DX_FLAG_LAST;
if ((root->reserved_zero ||
root->info_length < 8 ||
root->indirect_levels >=
ext2_dir_htree_level(fs)) &&
fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
clear_htree(ctx, ino);
dx_dir->numblocks = 0;
dx_db = NULL;
}
dx_dir->hashversion = root->hash_version;
if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
(fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
dx_dir->hashversion += 3;
dx_dir->depth = root->indirect_levels + 1;
} else if ((dirent->inode == 0) &&
(rec_len == fs->blocksize) &&
(ext2fs_dirent_name_len(dirent) == 0) &&
(ext2fs_le16_to_cpu(limit->limit) ==
((fs->blocksize - (8 + dx_csum_size)) /
sizeof(struct ext2_dx_entry)))) {
dx_db->type = DX_DIRBLOCK_NODE;
}
is_leaf = dx_db ? (dx_db->type == DX_DIRBLOCK_LEAF) : 0;
}
out_htree:
/* Leaf node with no space for csum? Rebuild dirs in pass 3A. */
if (is_leaf && !inline_data_size && failed_csum &&
!ext2fs_dirent_has_tail(fs, (struct ext2_dir_entry *)buf)) {
de_csum_size = 0;
if (e2fsck_dir_will_be_rehashed(ctx, ino)) {
failed_csum = 0;
goto skip_checksum;
}
if (!fix_problem(cd->ctx, PR_2_LEAF_NODE_MISSING_CSUM,
&cd->pctx))
goto skip_checksum;
e2fsck_rehash_dir_later(ctx, ino);
failed_csum = 0;
goto skip_checksum;
}
/* htree nodes don't use fake dirents to store checksums */
if (!is_leaf)
de_csum_size = 0;
skip_checksum:
if (inline_data_size) {
if (db->blockcnt) {
buf += EXT4_MIN_INLINE_DATA_SIZE;
max_block_size = inline_data_size - EXT4_MIN_INLINE_DATA_SIZE;
/* Zero-length second block, just exit */
if (max_block_size == 0)
return 0;
} else {
max_block_size = EXT4_MIN_INLINE_DATA_SIZE;
}
} else
max_block_size = fs->blocksize - de_csum_size;
if (ctx->encrypted_dirs)
encrypted = ext2fs_u32_list_test(ctx->encrypted_dirs, ino);
dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
prev = 0;
do {
dgrp_t group;
ext2_ino_t first_unused_inode;
unsigned int name_len;
problem = 0;
if (!inline_data_size || dot_state > 1) {
dirent = (struct ext2_dir_entry *) (buf + offset);
/*
* If there's not even space for the entry header,
* force salvaging this dir.
*/
if (max_block_size - offset < EXT2_DIR_ENTRY_HEADER_LEN)
rec_len = EXT2_DIR_REC_LEN(1);
else
(void) ext2fs_get_rec_len(fs, dirent, &rec_len);
cd->pctx.dirent = dirent;
cd->pctx.num = offset;
if ((offset + rec_len > max_block_size) ||
(rec_len < 12) ||
((rec_len % 4) != 0) ||
(((unsigned) ext2fs_dirent_name_len(dirent) + EXT2_DIR_ENTRY_HEADER_LEN) > rec_len)) {
if (fix_problem(ctx, PR_2_DIR_CORRUPTED,
&cd->pctx)) {
#ifdef WORDS_BIGENDIAN
/*
* On big-endian systems, if the dirent
* swap routine finds a rec_len that it
* doesn't like, it continues
* processing the block as if rec_len
* == EXT2_DIR_ENTRY_HEADER_LEN. This means that the name
* field gets byte swapped, which means
* that salvage will not detect the
* correct name length (unless the name
* has a length that's an exact
* multiple of four bytes), and it'll
* discard the entry (unnecessarily)
* and the rest of the dirent block.
* Therefore, swap the rest of the
* block back to disk order, run
* salvage, and re-swap anything after
* the salvaged dirent.
*/
int need_reswab = 0;
if (rec_len < EXT2_DIR_ENTRY_HEADER_LEN || rec_len % 4) {
need_reswab = 1;
ext2fs_dirent_swab_in2(fs,
((char *)dirent) + EXT2_DIR_ENTRY_HEADER_LEN,
max_block_size - offset - EXT2_DIR_ENTRY_HEADER_LEN,
0);
}
#endif
salvage_directory(fs, dirent, prev,
&offset,
max_block_size);
#ifdef WORDS_BIGENDIAN
if (need_reswab) {
(void) ext2fs_get_rec_len(fs,
dirent, &rec_len);
ext2fs_dirent_swab_in2(fs,
((char *)dirent) + offset + rec_len,
max_block_size - offset - rec_len,
0);
}
#endif
dir_modified++;
continue;
} else
goto abort_free_dict;
}
} else {
if (dot_state == 0) {
memset(&dot, 0, sizeof(dot));
dirent = &dot;
dirent->inode = ino;
dirent->rec_len = EXT2_DIR_REC_LEN(1);
dirent->name_len = 1 | filetype;
dirent->name[0] = '.';
} else if (dot_state == 1) {
memset(&dotdot, 0, sizeof(dotdot));
dirent = &dotdot;
dirent->inode =
((struct ext2_dir_entry *)buf)->inode;
dirent->rec_len = EXT2_DIR_REC_LEN(2);
dirent->name_len = 2 | filetype;
dirent->name[0] = '.';
dirent->name[1] = '.';
} else {
fatal_error(ctx, _("Can not continue."));
}
cd->pctx.dirent = dirent;
cd->pctx.num = offset;
}
if (dot_state == 0) {
if (check_dot(ctx, dirent, ino, &cd->pctx))
dir_modified++;
} else if (dot_state == 1) {
ret = check_dotdot(ctx, dirent, ino, &cd->pctx);
if (ret < 0)
goto abort_free_dict;
if (ret)
dir_modified++;
} else if (dirent->inode == ino) {
problem = PR_2_LINK_DOT;
if (fix_problem(ctx, PR_2_LINK_DOT, &cd->pctx)) {
dirent->inode = 0;
dir_modified++;
goto next;
}
}
if (!dirent->inode)
goto next;
/*
* Make sure the inode listed is a legal one.
*/
name_len = ext2fs_dirent_name_len(dirent);
if (((dirent->inode != EXT2_ROOT_INO) &&
(dirent->inode < EXT2_FIRST_INODE(fs->super))) ||
(dirent->inode > fs->super->s_inodes_count)) {
problem = PR_2_BAD_INO;
} else if (ctx->inode_bb_map &&
(ext2fs_test_inode_bitmap2(ctx->inode_bb_map,
dirent->inode))) {
/*
* If the inode is in a bad block, offer to
* clear it.
*/
problem = PR_2_BB_INODE;
} else if ((dot_state > 1) && (name_len == 1) &&
(dirent->name[0] == '.')) {
/*
* If there's a '.' entry in anything other
* than the first directory entry, it's a
* duplicate entry that should be removed.
*/
problem = PR_2_DUP_DOT;
} else if ((dot_state > 1) && (name_len == 2) &&
(dirent->name[0] == '.') &&
(dirent->name[1] == '.')) {
/*
* If there's a '..' entry in anything other
* than the second directory entry, it's a
* duplicate entry that should be removed.
*/
problem = PR_2_DUP_DOT_DOT;
} else if ((dot_state > 1) &&
(dirent->inode == EXT2_ROOT_INO)) {
/*
* 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.
*/
problem = PR_2_LINK_ROOT;
} else if ((dot_state > 1) && (name_len == 0)) {
/*
* Don't allow zero-length directory names.
*/
problem = PR_2_NULL_NAME;
}
if (problem) {
if (fix_problem(ctx, problem, &cd->pctx)) {
dirent->inode = 0;
dir_modified++;
goto next;
} else {
ext2fs_unmark_valid(fs);
if (problem == PR_2_BAD_INO)
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 (ctx->inode_bad_map &&
ext2fs_test_inode_bitmap2(ctx->inode_bad_map,
dirent->inode)) {
if (e2fsck_process_bad_inode(ctx, ino,
dirent->inode,
buf + fs->blocksize)) {
dirent->inode = 0;
dir_modified++;
goto next;
}
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return DIRENT_ABORT;
}
group = ext2fs_group_of_ino(fs, dirent->inode);
first_unused_inode = group * fs->super->s_inodes_per_group +
1 + fs->super->s_inodes_per_group -
ext2fs_bg_itable_unused(fs, group);
cd->pctx.group = group;
/*
* Check if the inode was missed out because
* _INODE_UNINIT flag was set or bg_itable_unused was
* incorrect. If so, clear the _INODE_UNINIT flag and
* restart e2fsck. In the future it would be nice if
* we could call a function in pass1.c that checks the
* newly visible inodes.
*/
if (ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT)) {
pctx.num = dirent->inode;
if (fix_problem(ctx, PR_2_INOREF_BG_INO_UNINIT,
&cd->pctx)){
ext2fs_bg_flags_clear(fs, group,
EXT2_BG_INODE_UNINIT);
ext2fs_mark_super_dirty(fs);
ctx->flags |= E2F_FLAG_RESTART_LATER;
} else {
ext2fs_unmark_valid(fs);
if (problem == PR_2_BAD_INO)
goto next;
}
} else if (dirent->inode >= first_unused_inode) {
pctx.num = dirent->inode;
if (fix_problem(ctx, PR_2_INOREF_IN_UNUSED, &cd->pctx)){
ext2fs_bg_itable_unused_set(fs, group, 0);
ext2fs_mark_super_dirty(fs);
ctx->flags |= E2F_FLAG_RESTART_LATER;
} else {
ext2fs_unmark_valid(fs);
if (problem == PR_2_BAD_INO)
goto next;
}
}
/*
* Offer to clear unused inodes; if we are going to be
* restarting the scan due to bg_itable_unused being
* wrong, then don't clear any inodes to avoid zapping
* inodes that were skipped during pass1 due to an
* incorrect bg_itable_unused; we'll get any real
* problems after we restart.
*/
if (!(ctx->flags & E2F_FLAG_RESTART_LATER) &&
!(ext2fs_test_inode_bitmap2(ctx->inode_used_map,
dirent->inode)))
problem = PR_2_UNUSED_INODE;
if (problem) {
if (fix_problem(ctx, problem, &cd->pctx)) {
dirent->inode = 0;
dir_modified++;
goto next;
} else {
ext2fs_unmark_valid(fs);
if (problem == PR_2_BAD_INO)
goto next;
}
}
if (!encrypted && check_name(ctx, dirent, &cd->pctx))
dir_modified++;
if (encrypted && (dot_state) > 1 &&
encrypted_check_name(ctx, dirent, &cd->pctx)) {
dir_modified++;
goto next;
}
if (check_filetype(ctx, dirent, ino, &cd->pctx))
dir_modified++;
if (dx_db) {
ext2fs_dirhash(dx_dir->hashversion, dirent->name,
ext2fs_dirent_name_len(dirent),
fs->super->s_hash_seed, &hash, 0);
if (hash < dx_db->min_hash)
dx_db->min_hash = hash;
if (hash > dx_db->max_hash)
dx_db->max_hash = hash;
}
/*
* 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 > 1) &&
(ext2fs_test_inode_bitmap2(ctx->inode_dir_map,
dirent->inode))) {
if (e2fsck_dir_info_get_parent(ctx, dirent->inode,
&subdir_parent)) {
cd->pctx.ino = dirent->inode;
fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
goto abort_free_dict;
}
if (subdir_parent) {
cd->pctx.ino2 = subdir_parent;
if (fix_problem(ctx, PR_2_LINK_DIR,
&cd->pctx)) {
dirent->inode = 0;
dir_modified++;
goto next;
}
cd->pctx.ino2 = 0;
} else {
(void) e2fsck_dir_info_set_parent(ctx,
dirent->inode, ino);
}
}
if (dups_found) {
;
} else if (dict_lookup(&de_dict, dirent)) {
clear_problem_context(&pctx);
pctx.ino = ino;
pctx.dirent = dirent;
fix_problem(ctx, PR_2_REPORT_DUP_DIRENT, &pctx);
e2fsck_rehash_dir_later(ctx, ino);
dups_found++;
} else
dict_alloc_insert(&de_dict, dirent, dirent);
ext2fs_icount_increment(ctx->inode_count, dirent->inode,
&links);
if (links > 1)
ctx->fs_links_count++;
ctx->fs_total_count++;
next:
prev = dirent;
if (dir_modified)
(void) ext2fs_get_rec_len(fs, dirent, &rec_len);
if (!inline_data_size || dot_state > 1) {
offset += rec_len;
} else {
if (dot_state == 1) {
offset = 4;
/*
* If we get here, we're checking an inline
* directory and we've just checked a (fake)
* dotdot entry that we created on the stack.
* Therefore set 'prev' to NULL so that if we
* call salvage_directory on the next entry,
* it won't try to absorb the next entry into
* the on-stack dotdot entry.
*/
prev = NULL;
}
}
dot_state++;
} while (offset < max_block_size);
#if 0
printf("\n");
#endif
if (dx_db) {
#ifdef DX_DEBUG
printf("db_block %d, type %d, min_hash 0x%0x, max_hash 0x%0x\n",
db->blockcnt, dx_db->type,
dx_db->min_hash, dx_db->max_hash);
#endif
cd->pctx.dir = cd->pctx.ino;
if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
(dx_db->type == DX_DIRBLOCK_NODE))
parse_int_node(fs, db, cd, dx_dir, buf, failed_csum);
}
if (offset != max_block_size) {
cd->pctx.num = rec_len + offset - max_block_size;
if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
dirent->rec_len = cd->pctx.num;
dir_modified++;
}
}
if (dir_modified) {
int flags, will_rehash;
/* leaf block with no tail? Rehash dirs later. */
if (ext2fs_has_feature_metadata_csum(fs->super) &&
is_leaf &&
!inline_data_size &&
!ext2fs_dirent_has_tail(fs, (struct ext2_dir_entry *)buf)) {
if (insert_dirent_tail(fs, buf) == 0)
goto write_and_fix;
e2fsck_rehash_dir_later(ctx, ino);
}
write_and_fix:
will_rehash = e2fsck_dir_will_be_rehashed(ctx, ino);
if (will_rehash) {
flags = ctx->fs->flags;
ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
}
if (inline_data_size) {
buf = ibuf;
#ifdef WORDS_BIGENDIAN
if (db->blockcnt)
goto skip_first_write_swab;
*((__u32 *)buf) = ext2fs_le32_to_cpu(*((__u32 *)buf));
cd->pctx.errcode = ext2fs_dirent_swab_out2(fs,
buf + EXT4_INLINE_DATA_DOTDOT_SIZE,
EXT4_MIN_INLINE_DATA_SIZE -
EXT4_INLINE_DATA_DOTDOT_SIZE,
0);
if (cd->pctx.errcode)
goto skip_second_write_swab;
skip_first_write_swab:
if (inline_data_size <= EXT4_MIN_INLINE_DATA_SIZE ||
!db->blockcnt)
goto skip_second_write_swab;
cd->pctx.errcode = ext2fs_dirent_swab_out2(fs,
buf + EXT4_MIN_INLINE_DATA_SIZE,
inline_data_size -
EXT4_MIN_INLINE_DATA_SIZE,
0);
skip_second_write_swab:
if (cd->pctx.errcode &&
!fix_problem(ctx, PR_2_WRITE_DIRBLOCK, &cd->pctx))
goto abort_free_dict;
#endif
cd->pctx.errcode =
ext2fs_inline_data_set(fs, ino, 0, buf,
inline_data_size);
} else
cd->pctx.errcode = ext2fs_write_dir_block4(fs, block_nr,
buf, 0, ino);
if (will_rehash)
ctx->fs->flags = (flags &
EXT2_FLAG_IGNORE_CSUM_ERRORS) |
(ctx->fs->flags &
~EXT2_FLAG_IGNORE_CSUM_ERRORS);
if (cd->pctx.errcode) {
if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
&cd->pctx))
goto abort_free_dict;
}
ext2fs_mark_changed(fs);
} else if (is_leaf && failed_csum && !dir_modified) {
/*
* If a leaf node that fails csum makes it this far without
* alteration, ask the user if the checksum should be fixed.
*/
if (fix_problem(ctx, PR_2_LEAF_NODE_ONLY_CSUM_INVALID,
&cd->pctx))
goto write_and_fix;
}
dict_free_nodes(&de_dict);
return 0;
abort_free_dict:
ctx->flags |= E2F_FLAG_ABORT;
dict_free_nodes(&de_dict);
return DIRENT_ABORT;
}
struct del_block {
e2fsck_t ctx;
e2_blkcnt_t num;
blk64_t last_cluster;
};
/*
* 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,
blk64_t *block_nr,
e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct del_block *p = priv_data;
blk64_t cluster = EXT2FS_B2C(fs, *block_nr);
if (*block_nr == 0)
return 0;
if (cluster == p->last_cluster)
return 0;
p->last_cluster = cluster;
if ((*block_nr < fs->super->s_first_data_block) ||
(*block_nr >= ext2fs_blocks_count(fs->super)))
return 0;
ext2fs_block_alloc_stats2(fs, *block_nr, -1);
p->num++;
return 0;
}
/*
* This function deallocates an inode
*/
static void deallocate_inode(e2fsck_t ctx, ext2_ino_t ino, char* block_buf)
{
ext2_filsys fs = ctx->fs;
struct ext2_inode inode;
struct problem_context pctx;
__u32 count;
struct del_block del_block;
e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
clear_problem_context(&pctx);
pctx.ino = ino;
/*
* Fix up the bitmaps...
*/
e2fsck_read_bitmaps(ctx);
ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
if (ext2fs_file_acl_block(fs, &inode) &&
ext2fs_has_feature_xattr(fs->super)) {
pctx.errcode = ext2fs_adjust_ea_refcount3(fs,
ext2fs_file_acl_block(fs, &inode),
block_buf, -1, &count, ino);
if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
pctx.errcode = 0;
count = 1;
}
if (pctx.errcode) {
pctx.blk = ext2fs_file_acl_block(fs, &inode);
fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if (count == 0) {
ext2fs_block_alloc_stats2(fs,
ext2fs_file_acl_block(fs, &inode), -1);
}
ext2fs_file_acl_block_set(fs, &inode, 0);
}
if (!ext2fs_inode_has_valid_blocks2(fs, &inode))
goto clear_inode;
/* Inline data inodes don't have blocks to iterate */
if (inode.i_flags & EXT4_INLINE_DATA_FL)
goto clear_inode;
if (LINUX_S_ISREG(inode.i_mode) &&
ext2fs_needs_large_file_feature(EXT2_I_SIZE(&inode)))
ctx->large_files--;
del_block.ctx = ctx;
del_block.num = 0;
del_block.last_cluster = 0;
pctx.errcode = ext2fs_block_iterate3(fs, ino, 0, block_buf,
deallocate_inode_block,
&del_block);
if (pctx.errcode) {
fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
clear_inode:
/* Inode may have changed by block_iterate, so reread it */
e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
e2fsck_clear_inode(ctx, ino, &inode, 0, "deallocate_inode");
}
/*
* This function clears the htree flag on an inode
*/
static void clear_htree(e2fsck_t ctx, ext2_ino_t ino)
{
struct ext2_inode inode;
e2fsck_read_inode(ctx, ino, &inode, "clear_htree");
inode.i_flags = inode.i_flags & ~EXT2_INDEX_FL;
e2fsck_write_inode(ctx, ino, &inode, "clear_htree");
if (ctx->dirs_to_hash)
ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
}
int e2fsck_process_bad_inode(e2fsck_t ctx, ext2_ino_t dir,
ext2_ino_t ino, char *buf)
{
ext2_filsys fs = ctx->fs;
struct ext2_inode inode;
int inode_modified = 0;
int not_fixed = 0;
unsigned char *frag, *fsize;
struct problem_context pctx;
problem_t problem = 0;
e2fsck_read_inode(ctx, ino, &inode, "process_bad_inode");
clear_problem_context(&pctx);
pctx.ino = ino;
pctx.dir = dir;
pctx.inode = &inode;
if (ext2fs_file_acl_block(fs, &inode) &&
!ext2fs_has_feature_xattr(fs->super)) {
if (fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
ext2fs_file_acl_block_set(fs, &inode, 0);
inode_modified++;
} else
not_fixed++;
}
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)))
problem = PR_2_BAD_MODE;
else if (LINUX_S_ISCHR(inode.i_mode)
&& !e2fsck_pass1_check_device_inode(fs, &inode))
problem = PR_2_BAD_CHAR_DEV;
else if (LINUX_S_ISBLK(inode.i_mode)
&& !e2fsck_pass1_check_device_inode(fs, &inode))
problem = PR_2_BAD_BLOCK_DEV;
else if (LINUX_S_ISFIFO(inode.i_mode)
&& !e2fsck_pass1_check_device_inode(fs, &inode))
problem = PR_2_BAD_FIFO;
else if (LINUX_S_ISSOCK(inode.i_mode)
&& !e2fsck_pass1_check_device_inode(fs, &inode))
problem = PR_2_BAD_SOCKET;
else if (LINUX_S_ISLNK(inode.i_mode)
&& !e2fsck_pass1_check_symlink(fs, ino, &inode, buf)) {
problem = PR_2_INVALID_SYMLINK;
}
if (problem) {
if (fix_problem(ctx, problem, &pctx)) {
deallocate_inode(ctx, ino, 0);
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return 0;
return 1;
} else
not_fixed++;
problem = 0;
}
if (inode.i_faddr) {
if (fix_problem(ctx, PR_2_FADDR_ZERO, &pctx)) {
inode.i_faddr = 0;
inode_modified++;
} else
not_fixed++;
}
switch (fs->super->s_creator_os) {
case EXT2_OS_HURD:
frag = &inode.osd2.hurd2.h_i_frag;
fsize = &inode.osd2.hurd2.h_i_fsize;
break;
default:
frag = fsize = 0;
}
if (frag && *frag) {
pctx.num = *frag;
if (fix_problem(ctx, PR_2_FRAG_ZERO, &pctx)) {
*frag = 0;
inode_modified++;
} else
not_fixed++;
pctx.num = 0;
}
if (fsize && *fsize) {
pctx.num = *fsize;
if (fix_problem(ctx, PR_2_FSIZE_ZERO, &pctx)) {
*fsize = 0;
inode_modified++;
} else
not_fixed++;
pctx.num = 0;
}
if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
!ext2fs_has_feature_huge_file(fs->super) &&
(inode.osd2.linux2.l_i_blocks_hi != 0)) {
pctx.num = inode.osd2.linux2.l_i_blocks_hi;
if (fix_problem(ctx, PR_2_BLOCKS_HI_ZERO, &pctx)) {
inode.osd2.linux2.l_i_blocks_hi = 0;
inode_modified++;
}
}
if ((fs->super->s_creator_os == EXT2_OS_LINUX) &&
!ext2fs_has_feature_64bit(fs->super) &&
inode.osd2.linux2.l_i_file_acl_high != 0) {
pctx.num = inode.osd2.linux2.l_i_file_acl_high;
if (fix_problem(ctx, PR_2_I_FILE_ACL_HI_ZERO, &pctx)) {
inode.osd2.linux2.l_i_file_acl_high = 0;
inode_modified++;
} else
not_fixed++;
}
if (ext2fs_file_acl_block(fs, &inode) &&
((ext2fs_file_acl_block(fs, &inode) < fs->super->s_first_data_block) ||
(ext2fs_file_acl_block(fs, &inode) >= ext2fs_blocks_count(fs->super)))) {
if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
ext2fs_file_acl_block_set(fs, &inode, 0);
inode_modified++;
} else
not_fixed++;
}
if (inode.i_size_high && !ext2fs_has_feature_largedir(fs->super) &&
LINUX_S_ISDIR(inode.i_mode)) {
if (fix_problem(ctx, PR_2_DIR_SIZE_HIGH_ZERO, &pctx)) {
inode.i_size_high = 0;
inode_modified++;
} else
not_fixed++;
}
if (inode_modified)
e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
if (!not_fixed && ctx->inode_bad_map)
ext2fs_unmark_inode_bitmap2(ctx->inode_bad_map, ino);
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(e2fsck_t ctx,
struct ext2_db_entry2 *db,
char *buf EXT2FS_ATTR((unused)),
struct problem_context *pctx)
{
ext2_filsys fs = ctx->fs;
blk64_t blk = 0;
char *block;
struct ext2_inode inode;
if (fix_problem(ctx, PR_2_DIRECTORY_HOLE, pctx) == 0)
return 1;
/*
* Read the inode and block bitmaps in; we'll be messing with
* them.
*/
e2fsck_read_bitmaps(ctx);
/*
* First, find a free block
*/
e2fsck_read_inode(ctx, db->ino, &inode, "allocate_dir_block");
pctx->errcode = ext2fs_map_cluster_block(fs, db->ino, &inode,
db->blockcnt, &blk);
if (pctx->errcode || blk == 0) {
blk = ext2fs_find_inode_goal(fs, db->ino, &inode, db->blockcnt);
pctx->errcode = ext2fs_new_block2(fs, blk,
ctx->block_found_map, &blk);
if (pctx->errcode) {
pctx->str = "ext2fs_new_block";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
}
ext2fs_mark_block_bitmap2(ctx->block_found_map, blk);
ext2fs_mark_block_bitmap2(fs->block_map, blk);
ext2fs_mark_bb_dirty(fs);
/*
* Now let's create the actual data block for the inode
*/
if (db->blockcnt)
pctx->errcode = ext2fs_new_dir_block(fs, 0, 0, &block);
else
pctx->errcode = ext2fs_new_dir_block(fs, db->ino,
EXT2_ROOT_INO, &block);
if (pctx->errcode) {
pctx->str = "ext2fs_new_dir_block";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
pctx->errcode = ext2fs_write_dir_block4(fs, blk, block, 0, db->ino);
ext2fs_free_mem(&block);
if (pctx->errcode) {
pctx->str = "ext2fs_write_dir_block";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
/*
* Update the inode block count
*/
ext2fs_iblk_add_blocks(fs, &inode, 1);
if (EXT2_I_SIZE(&inode) < ((__u64) db->blockcnt+1) * fs->blocksize) {
pctx->errcode = ext2fs_inode_size_set(fs, &inode,
(db->blockcnt+1) * fs->blocksize);
if (pctx->errcode) {
pctx->str = "ext2fs_inode_size_set";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
}
e2fsck_write_inode(ctx, db->ino, &inode, "allocate_dir_block");
/*
* Finally, update the block pointers for the inode
*/
db->blk = blk;
pctx->errcode = ext2fs_bmap2(fs, db->ino, &inode, 0, BMAP_SET,
db->blockcnt, 0, &blk);
if (pctx->errcode) {
pctx->str = "ext2fs_block_iterate";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
return 0;
}