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gerrit.nordix.org / codeaurora / busybox / 51a43b47fefaea46b00a74180a7d0b39022e6d11 / . / e2fsprogs / e2fsck / pass2.c
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/*
* 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 <string.h>
#include "e2fsck.h"
#include "problem.h"
#include "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_block(ext2_filsys fs,
struct ext2_db_entry *dir_blocks_info,
void *priv_data);
static int allocate_dir_block(e2fsck_t ctx,
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,
e2_blkcnt_t blockcnt,
blk_t ref_block,
int ref_offset,
void *priv_data);
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;
};
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;
#ifdef RESOURCE_TRACK
struct resource_track rtrack;
#endif
struct dir_info *dir;
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;
#ifdef RESOURCE_TRACK
init_resource_track(&rtrack);
#endif
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 = ext2fs_create_icount2(fs, EXT2_ICOUNT_OPT_INCREMENT,
0, 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;
return;
}
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.)
*/
dir = e2fsck_get_dir_info(ctx, EXT2_ROOT_INO);
if (dir)
dir->parent = EXT2_ROOT_INO;
cd.buf = buf;
cd.ctx = ctx;
cd.count = 1;
cd.max = ext2fs_dblist_count(fs->dblist);
if (ctx->progress)
(void) (ctx->progress)(ctx, 2, 0, cd.max);
if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX)
ext2fs_dblist_sort(fs->dblist, special_dir_block_cmp);
cd.pctx.errcode = ext2fs_dblist_iterate(fs->dblist, check_dir_block,
&cd);
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return;
if (cd.pctx.errcode) {
fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
#ifdef ENABLE_HTREE
for (i=0; (dx_dir = e2fsck_dx_dir_info_iter(ctx, &i)) != 0;) {
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return;
if (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
*/
for (b=0, dx_db = dx_dir->dx_block;
b < dx_dir->numblocks;
b++, dx_db++) {
if ((dx_db->type != DX_DIRBLOCK_LEAF) ||
!(dx_db->flags & (DX_FLAG_FIRST | DX_FLAG_LAST)))
continue;
dx_parent = &dx_dir->dx_block[dx_db->parent];
/*
* 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;
/*
* 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;
}
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) {
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 (code == 0)
continue;
}
if (bad_dir && fix_problem(ctx, PR_2_HTREE_CLEAR, &pctx)) {
clear_htree(ctx, dx_dir->ino);
dx_dir->numblocks = 0;
}
}
#endif
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;
}
clear_problem_context(&pctx);
if (ctx->large_files) {
if (!(sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_LARGE_FILE) &&
fix_problem(ctx, PR_2_FEATURE_LARGE_FILES, &pctx)) {
sb->s_feature_ro_compat |=
EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
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);
}
} else if (!ctx->large_files &&
(sb->s_feature_ro_compat &
EXT2_FEATURE_RO_COMPAT_LARGE_FILE)) {
if (fs->flags & EXT2_FLAG_RW) {
sb->s_feature_ro_compat &=
~EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
ext2fs_mark_super_dirty(fs);
}
}
#ifdef RESOURCE_TRACK
if (ctx->options & E2F_OPT_TIME2) {
e2fsck_clear_progbar(ctx);
print_resource_track(_("Pass 2"), &rtrack);
}
#endif
}
#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 = de_a->name_len & 0xFF;
de_b = (const struct ext2_dir_entry *) b;
b_len = de_b->name_len & 0xFF;
if (a_len != b_len)
return (a_len - b_len);
return strncmp(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_entry *db_a =
(const struct ext2_db_entry *) a;
const struct ext2_db_entry *db_b =
(const struct ext2_db_entry *) 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;
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 & 0xFF) != 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(ctx, 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(ctx, 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) {
if (created ||
fix_problem(ctx, PR_2_SPLIT_DOT, pctx)) {
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(e2fsck_t ctx,
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 & 0xFF) != 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(ctx, 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(e2fsck_t ctx,
struct ext2_dir_entry *dirent,
ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
struct problem_context *pctx)
{
int i;
int fixup = -1;
int ret = 0;
for ( i = 0; i < (dirent->name_len & 0xFF); i++) {
if (dirent->name[i] == '/' || dirent->name[i] == '\0') {
if (fixup < 0) {
fixup = fix_problem(ctx, PR_2_BAD_NAME, pctx);
}
if (fixup) {
dirent->name[i] = '.';
ret = 1;
}
}
}
return ret;
}
/*
* 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 = dirent->name_len >> 8;
int should_be = EXT2_FT_UNKNOWN;
struct ext2_inode inode;
if (!(ctx->fs->super->s_feature_incompat &
EXT2_FEATURE_INCOMPAT_FILETYPE)) {
if (filetype == 0 ||
!fix_problem(ctx, PR_2_CLEAR_FILETYPE, pctx))
return 0;
dirent->name_len = dirent->name_len & 0xFF;
return 1;
}
if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dirent->inode)) {
should_be = EXT2_FT_DIR;
} else if (ext2fs_test_inode_bitmap(ctx->inode_reg_map,
dirent->inode)) {
should_be = EXT2_FT_REG_FILE;
} else if (ctx->inode_bad_map &&
ext2fs_test_inode_bitmap(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;
dirent->name_len = (dirent->name_len & 0xFF) | should_be << 8;
return 1;
}
#ifdef ENABLE_HTREE
static void parse_int_node(ext2_filsys fs,
struct ext2_db_entry *db,
struct check_dir_struct *cd,
struct dx_dir_info *dx_dir,
char *block_buf)
{
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;
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: %d\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);
} else {
ent = (struct ext2_dx_entry *) (block_buf+8);
}
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);
expect_limit = (fs->blocksize - ((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 %d\n", i,
hash, ext2fs_le32_to_cpu(ent[i].block));
#endif
blk = ext2fs_le32_to_cpu(ent[i].block) & 0x0ffffff;
/* 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;
}
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;
}
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;
}
#endif /* ENABLE_HTREE */
/*
* 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)
{
char *cp = (char *) dirent;
int left = fs->blocksize - *offset - dirent->rec_len;
int name_len = dirent->name_len & 0xFF;
/*
* 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) && (dirent->rec_len == 8)) {
memmove(cp, cp+8, left);
memset(cp + left, 0, 8);
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) &&
(name_len + 8 <= dirent->rec_len + left) &&
dirent->inode <= fs->super->s_inodes_count &&
strnlen(dirent->name, name_len) == name_len) {
dirent->rec_len += left;
return;
}
/*
* If the directory entry is a multiple of four, so it is
* valid, let the previous directory entry absorb the invalid
* one.
*/
if (prev && dirent->rec_len && (dirent->rec_len % 4) == 0) {
prev->rec_len += dirent->rec_len;
*offset += dirent->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) {
prev->rec_len += fs->blocksize - *offset;
*offset = fs->blocksize;
} else {
dirent->rec_len = fs->blocksize - *offset;
dirent->name_len = 0;
dirent->inode = 0;
}
}
static int check_dir_block(ext2_filsys fs,
struct ext2_db_entry *db,
void *priv_data)
{
struct dir_info *subdir, *dir;
struct dx_dir_info *dx_dir;
#ifdef ENABLE_HTREE
struct dx_dirblock_info *dx_db = 0;
#endif /* ENABLE_HTREE */
struct ext2_dir_entry *dirent, *prev;
ext2_dirhash_t hash;
unsigned int offset = 0;
int dir_modified = 0;
int dot_state;
blk_t block_nr = db->blk;
ext2_ino_t ino = db->ino;
__u16 links;
struct check_dir_struct *cd;
char *buf;
e2fsck_t ctx;
int 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;
cd = (struct check_dir_struct *) priv_data;
buf = cd->buf;
ctx = cd->ctx;
if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
return DIRENT_ABORT;
if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
return DIRENT_ABORT;
/*
* Make sure the inode is still in use (could have been
* deleted in the duplicate/bad blocks pass.
*/
if (!(ext2fs_test_inode_bitmap(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 (db->blk == 0) {
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
cd->pctx.errcode = ext2fs_read_dir_block(fs, block_nr, buf);
if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
cd->pctx.errcode = 0; /* We'll handle this ourselves */
if (cd->pctx.errcode) {
if (!fix_problem(ctx, PR_2_READ_DIRBLOCK, &cd->pctx)) {
ctx->flags |= E2F_FLAG_ABORT;
return DIRENT_ABORT;
}
memset(buf, 0, fs->blocksize);
}
#ifdef ENABLE_HTREE
dx_dir = e2fsck_get_dx_dir_info(ctx, ino);
if (dx_dir && dx_dir->numblocks) {
if (db->blockcnt >= dx_dir->numblocks) {
printf("XXX should never happen!!!\n");
abort();
}
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;
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 > 1) &&
fix_problem(ctx, PR_2_HTREE_BAD_ROOT, &cd->pctx)) {
clear_htree(ctx, ino);
dx_dir->numblocks = 0;
dx_db = 0;
}
dx_dir->hashversion = root->hash_version;
dx_dir->depth = root->indirect_levels + 1;
} else if ((dirent->inode == 0) &&
(dirent->rec_len == fs->blocksize) &&
(dirent->name_len == 0) &&
(ext2fs_le16_to_cpu(limit->limit) ==
((fs->blocksize-8) /
sizeof(struct ext2_dx_entry))))
dx_db->type = DX_DIRBLOCK_NODE;
}
#endif /* ENABLE_HTREE */
dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
prev = 0;
do {
problem = 0;
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 < 12) ||
((dirent->rec_len % 4) != 0) ||
(((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
if (fix_problem(ctx, PR_2_DIR_CORRUPTED, &cd->pctx)) {
salvage_directory(fs, dirent, prev, &offset);
dir_modified++;
continue;
} else
goto abort_free_dict;
}
if ((dirent->name_len & 0xFF) > EXT2_NAME_LEN) {
if (fix_problem(ctx, PR_2_FILENAME_LONG, &cd->pctx)) {
dirent->name_len = EXT2_NAME_LEN;
dir_modified++;
}
}
if (dot_state == 0) {
if (check_dot(ctx, dirent, ino, &cd->pctx))
dir_modified++;
} else if (dot_state == 1) {
dir = e2fsck_get_dir_info(ctx, ino);
if (!dir) {
fix_problem(ctx, PR_2_NO_DIRINFO, &cd->pctx);
goto abort_free_dict;
}
if (check_dotdot(ctx, dirent, dir, &cd->pctx))
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.
*/
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 (!(ext2fs_test_inode_bitmap(ctx->inode_used_map,
dirent->inode))) {
/*
* If the inode is unused, offer to clear it.
*/
problem = PR_2_UNUSED_INODE;
} else if (ctx->inode_bb_map &&
(ext2fs_test_inode_bitmap(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) &&
((dirent->name_len & 0xFF) == 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) &&
((dirent->name_len & 0xFF) == 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) &&
(dirent->name_len & 0xFF) == 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_bitmap(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;
}
if (check_name(ctx, dirent, ino, &cd->pctx))
dir_modified++;
if (check_filetype(ctx, dirent, ino, &cd->pctx))
dir_modified++;
#ifdef ENABLE_HTREE
if (dx_db) {
ext2fs_dirhash(dx_dir->hashversion, dirent->name,
(dirent->name_len & 0xFF),
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;
}
#endif
/*
* 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_bitmap(ctx->inode_dir_map,
dirent->inode))) {
subdir = e2fsck_get_dir_info(ctx, dirent->inode);
if (!subdir) {
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
subdir->parent = 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);
if (!ctx->dirs_to_hash)
ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
if (ctx->dirs_to_hash)
ext2fs_u32_list_add(ctx->dirs_to_hash, 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;
offset += dirent->rec_len;
dot_state++;
} while (offset < fs->blocksize);
#if 0
printf("\n");
#endif
#ifdef ENABLE_HTREE
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);
}
#endif /* ENABLE_HTREE */
if (offset != fs->blocksize) {
cd->pctx.num = dirent->rec_len - fs->blocksize + offset;
if (fix_problem(ctx, PR_2_FINAL_RECLEN, &cd->pctx)) {
dirent->rec_len = cd->pctx.num;
dir_modified++;
}
}
if (dir_modified) {
cd->pctx.errcode = ext2fs_write_dir_block(fs, block_nr, buf);
if (cd->pctx.errcode) {
if (!fix_problem(ctx, PR_2_WRITE_DIRBLOCK,
&cd->pctx))
goto abort_free_dict;
}
ext2fs_mark_changed(fs);
}
dict_free_nodes(&de_dict);
return 0;
abort_free_dict:
dict_free_nodes(&de_dict);
ctx->flags |= E2F_FLAG_ABORT;
return DIRENT_ABORT;
}
/*
* 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,
e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
blk_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
e2fsck_t ctx = (e2fsck_t) priv_data;
if (HOLE_BLKADDR(*block_nr))
return 0;
if ((*block_nr < fs->super->s_first_data_block) ||
(*block_nr >= fs->super->s_blocks_count))
return 0;
ext2fs_unmark_block_bitmap(ctx->block_found_map, *block_nr);
ext2fs_block_alloc_stats(fs, *block_nr, -1);
return 0;
}
/*
* This fuction 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;
ext2fs_icount_store(ctx->inode_link_info, ino, 0);
e2fsck_read_inode(ctx, ino, &inode, "deallocate_inode");
inode.i_links_count = 0;
inode.i_dtime = time(0);
e2fsck_write_inode(ctx, ino, &inode, "deallocate_inode");
clear_problem_context(&pctx);
pctx.ino = ino;
/*
* Fix up the bitmaps...
*/
e2fsck_read_bitmaps(ctx);
ext2fs_unmark_inode_bitmap(ctx->inode_used_map, ino);
ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, ino);
if (ctx->inode_bad_map)
ext2fs_unmark_inode_bitmap(ctx->inode_bad_map, ino);
ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode));
if (inode.i_file_acl &&
(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR)) {
pctx.errcode = ext2fs_adjust_ea_refcount(fs, inode.i_file_acl,
block_buf, -1, &count);
if (pctx.errcode == EXT2_ET_BAD_EA_BLOCK_NUM) {
pctx.errcode = 0;
count = 1;
}
if (pctx.errcode) {
pctx.blk = inode.i_file_acl;
fix_problem(ctx, PR_2_ADJ_EA_REFCOUNT, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if (count == 0) {
ext2fs_unmark_block_bitmap(ctx->block_found_map,
inode.i_file_acl);
ext2fs_block_alloc_stats(fs, inode.i_file_acl, -1);
}
inode.i_file_acl = 0;
}
if (!ext2fs_inode_has_valid_blocks(&inode))
return;
if (LINUX_S_ISREG(inode.i_mode) &&
(inode.i_size_high || inode.i_size & 0x80000000UL))
ctx->large_files--;
pctx.errcode = ext2fs_block_iterate2(fs, ino, 0, block_buf,
deallocate_inode_block, ctx);
if (pctx.errcode) {
fix_problem(ctx, PR_2_DEALLOC_INODE, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
}
/*
* This fuction 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);
}
extern 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;
int 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 (inode.i_file_acl &&
!(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_EXT_ATTR) &&
fix_problem(ctx, PR_2_FILE_ACL_ZERO, &pctx)) {
inode.i_file_acl = 0;
#ifdef EXT2FS_ENABLE_SWAPFS
/*
* This is a special kludge to deal with long symlinks
* on big endian systems. i_blocks had already been
* decremented earlier in pass 1, but since i_file_acl
* hadn't yet been cleared, ext2fs_read_inode()
* assumed that the file was short symlink and would
* not have byte swapped i_block[0]. Hence, we have
* to byte-swap it here.
*/
if (LINUX_S_ISLNK(inode.i_mode) &&
(fs->flags & EXT2_FLAG_SWAP_BYTES) &&
(inode.i_blocks == fs->blocksize >> 9))
inode.i_block[0] = ext2fs_swab32(inode.i_block[0]);
#endif
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, &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_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(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 (inode.i_file_acl &&
((inode.i_file_acl < fs->super->s_first_data_block) ||
(inode.i_file_acl >= fs->super->s_blocks_count))) {
if (fix_problem(ctx, PR_2_FILE_ACL_BAD, &pctx)) {
inode.i_file_acl = 0;
inode_modified++;
} else
not_fixed++;
}
if (inode.i_dir_acl &&
LINUX_S_ISDIR(inode.i_mode)) {
if (fix_problem(ctx, PR_2_DIR_ACL_ZERO, &pctx)) {
inode.i_dir_acl = 0;
inode_modified++;
} else
not_fixed++;
}
if (inode_modified)
e2fsck_write_inode(ctx, ino, &inode, "process_bad_inode");
if (!not_fixed)
ext2fs_unmark_inode_bitmap(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_entry *db,
char *buf EXT2FS_ATTR((unused)),
struct problem_context *pctx)
{
ext2_filsys fs = ctx->fs;
blk_t blk;
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
*/
pctx->errcode = ext2fs_new_block(fs, 0, 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_bitmap(ctx->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)
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_block(fs, blk, block);
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
*/
e2fsck_read_inode(ctx, 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(ctx, db->ino, &inode, "allocate_dir_block");
/*
* Finally, update the block pointers for the inode
*/
db->blk = blk;
pctx->errcode = ext2fs_block_iterate2(fs, db->ino, BLOCK_FLAG_HOLE,
0, update_dir_block, db);
if (pctx->errcode) {
pctx->str = "ext2fs_block_iterate";
fix_problem(ctx, PR_2_ALLOC_DIRBOCK, pctx);
return 1;
}
return 0;
}
/*
* This is a helper function for allocate_dir_block().
*/
static int update_dir_block(ext2_filsys fs EXT2FS_ATTR((unused)),
blk_t *block_nr,
e2_blkcnt_t blockcnt,
blk_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct ext2_db_entry *db;
db = (struct ext2_db_entry *) priv_data;
if (db->blockcnt == (int) blockcnt) {
*block_nr = db->blk;
return BLOCK_CHANGED;
}
return 0;
}