applets
arch
archival
console-tools
coreutils
debianutils
docs
e2fsprogs
old_e2fsprogs
blkid
e2p
ext2fs
Kbuild
alloc.c
alloc_sb.c
alloc_stats.c
alloc_tables.c
badblocks.c
bb_compat.c
bb_inode.c
bitmaps.c
bitops.c
bitops.h
block.c
bmap.c
bmove.c
brel.h
brel_ma.c
check_desc.c
closefs.c
cmp_bitmaps.c
dblist.c
dblist_dir.c
dir_iterate.c
dirblock.c
dirhash.c
dupfs.c
e2image.h
expanddir.c
ext2_err.h
ext2_ext_attr.h
ext2_fs.h
ext2_io.h
ext2_types.h
ext2fs.h
ext2fsP.h
ext2fs_inline.c
ext_attr.c
fileio.c
finddev.c
flushb.c
freefs.c
gen_bitmap.c
get_pathname.c
getsectsize.c
getsize.c
icount.c
imager.c
ind_block.c
initialize.c
inline.c
inode.c
inode_io.c
io_manager.c
irel.h
irel_ma.c
ismounted.c
jfs_dat.h
kernel-jbd.h
kernel-list.h
link.c
lookup.c
mkdir.c
mkjournal.c
namei.c
newdir.c
openfs.c
read_bb.c
read_bb_file.c
res_gdt.c
rs_bitmap.c
rw_bitmaps.c
sparse.c
swapfs.c
test_io.c
unix_io.c
unlink.c
valid_blk.c
version.c
write_bb_file.c
uuid
Config.in
Kbuild
README
chattr.c
e2fsbb.h
e2fsck.c
e2fsck.h
fsck.c
fsck.h
lsattr.c
mke2fs.c
tune2fs.c
util.c
util.h
Config.in
Kbuild
README
chattr.c
e2fs_defs.h
e2fs_lib.c
e2fs_lib.h
fsck.c
lsattr.c
editors
examples
findutils
include
init
libbb
libpwdgrp
loginutils
miscutils
modutils
networking
printutils
procps
runit
scripts
selinux
shell
sysklogd
testsuite
util-linux
.indent.pro
AUTHORS
Config.in
INSTALL
LICENSE
Makefile
Makefile.custom
Makefile.flags
Makefile.help
README
TODO
TODO_config_nommu
221 lines
5.2 KiB
C
221 lines
5.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* dir_iterate.c --- ext2fs directory iteration operations
|
|
*
|
|
* Copyright (C) 1993, 1994, 1994, 1995, 1996, 1997 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#if HAVE_ERRNO_H
|
|
#include <errno.h>
|
|
#endif
|
|
|
|
#include "ext2_fs.h"
|
|
#include "ext2fsP.h"
|
|
|
|
/*
|
|
* This function checks to see whether or not a potential deleted
|
|
* directory entry looks valid. What we do is check the deleted entry
|
|
* and each successive entry to make sure that they all look valid and
|
|
* that the last deleted entry ends at the beginning of the next
|
|
* undeleted entry. Returns 1 if the deleted entry looks valid, zero
|
|
* if not valid.
|
|
*/
|
|
static int ext2fs_validate_entry(char *buf, int offset, int final_offset)
|
|
{
|
|
struct ext2_dir_entry *dirent;
|
|
|
|
while (offset < final_offset) {
|
|
dirent = (struct ext2_dir_entry *)(buf + offset);
|
|
offset += dirent->rec_len;
|
|
if ((dirent->rec_len < 8) ||
|
|
((dirent->rec_len % 4) != 0) ||
|
|
(((dirent->name_len & 0xFF)+8) > dirent->rec_len))
|
|
return 0;
|
|
}
|
|
return (offset == final_offset);
|
|
}
|
|
|
|
errcode_t ext2fs_dir_iterate2(ext2_filsys fs,
|
|
ext2_ino_t dir,
|
|
int flags,
|
|
char *block_buf,
|
|
int (*func)(ext2_ino_t dir,
|
|
int entry,
|
|
struct ext2_dir_entry *dirent,
|
|
int offset,
|
|
int blocksize,
|
|
char *buf,
|
|
void *priv_data),
|
|
void *priv_data)
|
|
{
|
|
struct dir_context ctx;
|
|
errcode_t retval;
|
|
|
|
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
|
retval = ext2fs_check_directory(fs, dir);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ctx.dir = dir;
|
|
ctx.flags = flags;
|
|
if (block_buf)
|
|
ctx.buf = block_buf;
|
|
else {
|
|
retval = ext2fs_get_mem(fs->blocksize, &ctx.buf);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
ctx.func = func;
|
|
ctx.priv_data = priv_data;
|
|
ctx.errcode = 0;
|
|
retval = ext2fs_block_iterate2(fs, dir, 0, 0,
|
|
ext2fs_process_dir_block, &ctx);
|
|
if (!block_buf)
|
|
ext2fs_free_mem(&ctx.buf);
|
|
if (retval)
|
|
return retval;
|
|
return ctx.errcode;
|
|
}
|
|
|
|
struct xlate {
|
|
int (*func)(struct ext2_dir_entry *dirent,
|
|
int offset,
|
|
int blocksize,
|
|
char *buf,
|
|
void *priv_data);
|
|
void *real_private;
|
|
};
|
|
|
|
static int xlate_func(ext2_ino_t dir EXT2FS_ATTR((unused)),
|
|
int entry EXT2FS_ATTR((unused)),
|
|
struct ext2_dir_entry *dirent, int offset,
|
|
int blocksize, char *buf, void *priv_data)
|
|
{
|
|
struct xlate *xl = (struct xlate *) priv_data;
|
|
|
|
return (*xl->func)(dirent, offset, blocksize, buf, xl->real_private);
|
|
}
|
|
|
|
extern errcode_t ext2fs_dir_iterate(ext2_filsys fs,
|
|
ext2_ino_t dir,
|
|
int flags,
|
|
char *block_buf,
|
|
int (*func)(struct ext2_dir_entry *dirent,
|
|
int offset,
|
|
int blocksize,
|
|
char *buf,
|
|
void *priv_data),
|
|
void *priv_data)
|
|
{
|
|
struct xlate xl;
|
|
|
|
xl.real_private = priv_data;
|
|
xl.func = func;
|
|
|
|
return ext2fs_dir_iterate2(fs, dir, flags, block_buf,
|
|
xlate_func, &xl);
|
|
}
|
|
|
|
|
|
/*
|
|
* Helper function which is private to this module. Used by
|
|
* ext2fs_dir_iterate() and ext2fs_dblist_dir_iterate()
|
|
*/
|
|
int ext2fs_process_dir_block(ext2_filsys fs,
|
|
blk_t *blocknr,
|
|
e2_blkcnt_t blockcnt,
|
|
blk_t ref_block EXT2FS_ATTR((unused)),
|
|
int ref_offset EXT2FS_ATTR((unused)),
|
|
void *priv_data)
|
|
{
|
|
struct dir_context *ctx = (struct dir_context *) priv_data;
|
|
unsigned int offset = 0;
|
|
unsigned int next_real_entry = 0;
|
|
int ret = 0;
|
|
int changed = 0;
|
|
int do_abort = 0;
|
|
int entry, size;
|
|
struct ext2_dir_entry *dirent;
|
|
|
|
if (blockcnt < 0)
|
|
return 0;
|
|
|
|
entry = blockcnt ? DIRENT_OTHER_FILE : DIRENT_DOT_FILE;
|
|
|
|
ctx->errcode = ext2fs_read_dir_block(fs, *blocknr, ctx->buf);
|
|
if (ctx->errcode)
|
|
return BLOCK_ABORT;
|
|
|
|
while (offset < fs->blocksize) {
|
|
dirent = (struct ext2_dir_entry *) (ctx->buf + offset);
|
|
if (((offset + dirent->rec_len) > fs->blocksize) ||
|
|
(dirent->rec_len < 8) ||
|
|
((dirent->rec_len % 4) != 0) ||
|
|
(((dirent->name_len & 0xFF)+8) > dirent->rec_len)) {
|
|
ctx->errcode = EXT2_ET_DIR_CORRUPTED;
|
|
return BLOCK_ABORT;
|
|
}
|
|
if (!dirent->inode &&
|
|
!(ctx->flags & DIRENT_FLAG_INCLUDE_EMPTY))
|
|
goto next;
|
|
|
|
ret = (ctx->func)(ctx->dir,
|
|
(next_real_entry > offset) ?
|
|
DIRENT_DELETED_FILE : entry,
|
|
dirent, offset,
|
|
fs->blocksize, ctx->buf,
|
|
ctx->priv_data);
|
|
if (entry < DIRENT_OTHER_FILE)
|
|
entry++;
|
|
|
|
if (ret & DIRENT_CHANGED)
|
|
changed++;
|
|
if (ret & DIRENT_ABORT) {
|
|
do_abort++;
|
|
break;
|
|
}
|
|
next:
|
|
if (next_real_entry == offset)
|
|
next_real_entry += dirent->rec_len;
|
|
|
|
if (ctx->flags & DIRENT_FLAG_INCLUDE_REMOVED) {
|
|
size = ((dirent->name_len & 0xFF) + 11) & ~3;
|
|
|
|
if (dirent->rec_len != size) {
|
|
unsigned int final_offset;
|
|
|
|
final_offset = offset + dirent->rec_len;
|
|
offset += size;
|
|
while (offset < final_offset &&
|
|
!ext2fs_validate_entry(ctx->buf,
|
|
offset,
|
|
final_offset))
|
|
offset += 4;
|
|
continue;
|
|
}
|
|
}
|
|
offset += dirent->rec_len;
|
|
}
|
|
|
|
if (changed) {
|
|
ctx->errcode = ext2fs_write_dir_block(fs, *blocknr, ctx->buf);
|
|
if (ctx->errcode)
|
|
return BLOCK_ABORT;
|
|
}
|
|
if (do_abort)
|
|
return BLOCK_ABORT;
|
|
return 0;
|
|
}
|
|
|