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check.c
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check.c
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/* check.c - Check and repair a PC/MS-DOS filesystem
Copyright (C) 1993 Werner Almesberger <[email protected]>
Copyright (C) 1998 Roman Hodek <[email protected]>
Copyright (C) 2008-2014 Daniel Baumann <[email protected]>
Copyright (C) 2015 Andreas Bombe <[email protected]>
Copyright (C) 2017-2021 Pali Rohár <[email protected]>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http:https://www.gnu.org/licenses/>.
The complete text of the GNU General Public License
can be found in /usr/share/common-licenses/GPL-3 file.
*/
/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
* by Roman Hodek <[email protected]> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <ctype.h>
#include <wctype.h>
#include "common.h"
#include "fsck.fat.h"
#include "io.h"
#include "fat.h"
#include "file.h"
#include "lfn.h"
#include "check.h"
#include "boot.h"
#include "charconv.h"
/* the longest path on the filesystem that can be handled by path_name() */
#define PATH_NAME_MAX 1023
static DOS_FILE *root;
/* get start field of a dir entry */
#define FSTART(p,fs) \
((uint32_t)le16toh(p->dir_ent.start) | \
(fs->fat_bits == 32 ? (uint32_t)le16toh(p->dir_ent.starthi) << 16 : 0))
#define MODIFY(p,i,v) \
do { \
if (p->offset) { \
p->dir_ent.i = v; \
fs_write(p->offset+offsetof(DIR_ENT,i), \
sizeof(p->dir_ent.i),&p->dir_ent.i); \
} \
} while(0)
#define MODIFY_START(p,v,fs) \
do { \
uint32_t __v = (v); \
if (!p->offset) { \
/* writing to fake entry for FAT32 root dir */ \
if (!__v) die("Oops, deleting FAT32 root dir!"); \
fs->root_cluster = __v; \
p->dir_ent.start = htole16(__v&0xffff); \
p->dir_ent.starthi = htole16(__v>>16); \
__v = htole32(__v); \
fs_write(offsetof(struct boot_sector,root_cluster), \
sizeof(((struct boot_sector *)0)->root_cluster), \
&__v); \
} \
else { \
MODIFY(p,start,htole16((__v)&0xffff)); \
if (fs->fat_bits == 32) \
MODIFY(p,starthi,htole16((__v)>>16)); \
} \
} while(0)
/**
* Construct a full path (starting with '/') for the specified dentry,
* relative to the partition. All components are "long" names where possible.
*
* @param[in] file Information about dentry (file or directory) of interest
*
* return Pointer to static string containing file's full path
*/
static char *path_name(DOS_FILE * file)
{
static char path[PATH_NAME_MAX * 2];
if (!file)
*path = 0; /* Reached the root directory */
else {
if (strlen(path_name(file->parent)) > PATH_NAME_MAX)
die("Path name too long.");
if (strcmp(path, "/") != 0)
strcat(path, "/");
/* Append the long name to the path,
* or the short name if there isn't a long one
*/
strcpy(strrchr(path, 0),
file->lfn ? file->lfn : file_name(file->dir_ent.name));
}
return path;
}
static const char *month_str[] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
static char *file_stat(DOS_FILE * file)
{
static char temp[100];
unsigned int hours, minutes, secs, day, month, year;
unsigned short time, date;
time = le16toh(file->dir_ent.time);
date = le16toh(file->dir_ent.date);
year = 1980 + (date >> 9);
month = ((date >> 5) & 15);
if (month < 1) month = 1;
else if (month > 12) month = 12;
day = (date & 31);
if (day < 1) day = 1;
hours = (time >> 11);
if (hours > 23) hours = 23;
minutes = ((time >> 5) & 63);
if (minutes > 59) minutes = 59;
secs = (time & 31) * 2;
if (secs > 59) secs = 59;
sprintf(temp, " Size %u bytes, date %02u:%02u:%02u %s %02u %4u",
le32toh(file->dir_ent.size), hours, minutes, secs, month_str[month-1], day, year);
return temp;
}
static int bad_name(DOS_FILE * file)
{
int i, spc, suspicious = 0;
const char *bad_chars = atari_format ? "*?\\/:" : "*?<>|\"\\/:.";
const unsigned char *name = file->dir_ent.name;
const unsigned char *ext = name + 8;
/* do not check synthetic FAT32 root entry */
if (!file->offset)
return 0;
/* check if we have neither a long filename nor a short name */
if ((file->lfn == NULL) && (file->dir_ent.lcase & FAT_NO_83NAME)) {
return 1;
}
/* don't complain about the dummy 11 bytes used by patched Linux
kernels */
if (file->dir_ent.lcase & FAT_NO_83NAME)
return 0;
for (i = 0; i < MSDOS_NAME; i++) {
if ((name[i] < ' ' && !(i == 0 && name[0] == 0x05)) || name[i] == 0x7f)
return 1;
if (name[i] > 0x7f)
++suspicious;
if (strchr(bad_chars, name[i]))
return 1;
}
if (name[0] == ' ')
return 1;
if (no_spaces_in_sfns) {
spc = 0;
for (i = 0; i < 8; i++) {
if (name[i] == ' ')
spc = 1;
else if (spc)
/* non-space after a space not allowed, space terminates the name
* part */
return 1;
}
spc = 0;
for (i = 0; i < 3; i++) {
if (ext[i] == ' ')
spc = 1;
else if (spc)
/* non-space after a space not allowed, space terminates the ext
* part */
return 1;
}
}
/* Under GEMDOS, chars >= 128 are never allowed. */
if (atari_format && suspicious)
return 1;
/* Under MS-DOS and Windows, chars >= 128 in short names are valid
* (but these characters can be visualised differently depending on
* local codepage: CP437, CP866, etc). The chars are all basically ok,
* so we shouldn't auto-correct such names. */
return 0;
}
static void lfn_remove(off_t from, off_t to)
{
DIR_ENT empty;
/* New dir entry is zeroed except first byte, which is set to 0xe5.
* This is to avoid that some FAT-reading OSes (not Linux! ;) stop reading
* a directory at the first zero entry...
*/
memset(&empty, 0, sizeof(empty));
empty.name[0] = DELETED_FLAG;
for (; from < to; from += sizeof(empty)) {
fs_write(from, sizeof(DIR_ENT), &empty);
}
}
static void drop_file(DOS_FS * fs, DOS_FILE * file)
{
(void) fs;
MODIFY(file, name[0], DELETED_FLAG);
if (file->lfn)
lfn_remove(file->lfn_offset, file->offset);
--n_files;
}
static void truncate_file(DOS_FS * fs, DOS_FILE * file, uint32_t clusters)
{
int deleting;
uint32_t walk, next;
walk = FSTART(file, fs);
if ((deleting = !clusters))
MODIFY_START(file, 0, fs);
while (walk > 0 && walk != -1) {
next = next_cluster(fs, walk);
if (deleting)
set_fat(fs, walk, 0);
else if ((deleting = !--clusters))
set_fat(fs, walk, -1);
walk = next;
}
}
static void auto_rename(DOS_FILE * file)
{
DOS_FILE *first, *walk;
uint32_t number;
if (!file->offset) {
printf("Cannot rename FAT32 root dir\n");
return; /* cannot rename FAT32 root dir */
}
first = file->parent ? file->parent->first : root;
number = 0;
while (1) {
char num[8];
sprintf(num, "%07lu", (unsigned long)number);
memcpy(file->dir_ent.name, "FSCK", 4);
memcpy(file->dir_ent.name + 4, num, 7);
for (walk = first; walk; walk = walk->next)
if (walk != file
&& !strncmp((const char *)walk->dir_ent.name,
(const char *)file->dir_ent.name, MSDOS_NAME))
break;
if (!walk) {
if (file->dir_ent.lcase & FAT_NO_83NAME) {
/* as we only assign a new 8.3 filename, reset flag that 8.3 name is not
present */
file->dir_ent.lcase &= ~FAT_NO_83NAME;
/* reset the attributes, only keep DIR and VOLUME */
file->dir_ent.attr &= ~(ATTR_DIR | ATTR_VOLUME);
fs_write(file->offset, MSDOS_NAME + 2, &file->dir_ent);
} else {
fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
}
if (file->lfn) {
lfn_remove(file->lfn_offset, file->offset);
file->lfn = NULL;
}
return;
}
number++;
if (number > 9999999) {
die("Too many files need repair.");
}
}
die("Can't generate a unique name.");
}
static void rename_file(DOS_FILE * file)
{
unsigned char name[46];
unsigned char *walk, *here;
if (!file->offset) {
printf("Cannot rename FAT32 root dir\n");
return; /* cannot rename FAT32 root dir */
}
while (1) {
if (get_line("New name", (char *)name, 45)) {
if ((here = (unsigned char *)strchr((const char *)name, '\n')))
*here = 0;
for (walk = (unsigned char *)strrchr((const char *)name, 0);
walk >= name && (*walk == ' ' || *walk == '\t'); walk--) ;
walk[1] = 0;
for (walk = name; *walk == ' ' || *walk == '\t'; walk++) ;
if (file_cvt(walk, file->dir_ent.name)) {
if (file->dir_ent.lcase & FAT_NO_83NAME) {
/* as we only assign a new 8.3 filename, reset flag that 8.3 name is not
present */
file->dir_ent.lcase &= ~FAT_NO_83NAME;
/* reset the attributes, only keep DIR and VOLUME */
file->dir_ent.attr &= ~(ATTR_DIR | ATTR_VOLUME);
fs_write(file->offset, MSDOS_NAME + 2, &file->dir_ent);
} else {
fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
}
if (file->lfn) {
lfn_remove(file->lfn_offset, file->offset);
file->lfn = NULL;
}
return;
}
}
}
}
static uint32_t scan_free_entry(DOS_FS * fs, DOS_FILE * this)
{
uint32_t clu_num, offset;
int i;
DIR_ENT de;
i = 2 * sizeof(DIR_ENT); /* Skip '.' and '..' slots */
clu_num = FSTART(this, fs);
while (clu_num > 0 && clu_num != -1) {
offset = cluster_start(fs, clu_num) + (i % fs->cluster_size);
fs_read(offset, sizeof(DIR_ENT), &de);
if (IS_FREE(de.name))
return offset;
i += sizeof(DIR_ENT);
if (!(i % fs->cluster_size))
if ((clu_num = next_cluster(fs, clu_num)) == 0 || clu_num == -1)
break;
}
return 0;
}
static int handle_dot(DOS_FS * fs, DOS_FILE * file, int dotdot)
{
const char *name, *ent;
uint32_t new_offset, start;
if (dotdot) {
name = "..";
ent = MSDOS_DOTDOT;
if (!file->parent->parent) {
start = 0;
} else {
start = FSTART(file->parent->parent, fs);
if (start == fs->root_cluster)
start = 0;
}
} else {
name = ".";
ent = MSDOS_DOT;
start = FSTART(file->parent, fs);
}
if (!(file->dir_ent.attr & ATTR_DIR) || (FSTART(file, fs) != start) ||
strncmp((const char *)(file->dir_ent.name), ent, MSDOS_NAME)) {
if (IS_FREE(file->dir_ent.name)) {
printf("%s\n Expected a valid '%s' entry in the %s slot, found free entry.\n",
path_name(file->parent), name, dotdot ? "second" : "first");
switch (get_choice(1, " Creating.",
2,
1, "Create entry",
2, "Drop parent")) {
case 1:
goto conjure;
case 2:
drop_file(fs, file->parent);
return 1;
}
}
if (!strncmp((const char *)(file->dir_ent.name), ent, MSDOS_NAME)) {
printf("%s\n Invalid '%s' entry in the %s slot. Fixing.\n",
path_name(file->parent), name, dotdot ? "second" : "first");
MODIFY_START(file, start, fs);
MODIFY(file, attr, ATTR_DIR);
} else {
printf("%s\n Expected a valid '%s' entry in this slot.\n",
path_name(file), name);
switch (get_choice(3, " Moving entry down.",
3,
1, "Drop entry",
2, "Drop parent",
3, "Move entry down")) {
case 1:
drop_file(fs, file);
goto conjure;
case 2:
drop_file(fs, file->parent);
return 1;
case 3:
new_offset = scan_free_entry(fs, file->parent);
if (!new_offset) {
printf("No free entry found.\n");
return 0;
}
fs_write(new_offset, sizeof(file->dir_ent), &file->dir_ent);
goto conjure;
}
}
}
if (file->dir_ent.lcase & FAT_NO_83NAME) {
/* Some versions of mtools write these directory entries with random data in
this field. */
printf("%s\n Is a dot with no 8.3 name flag set, clearing.\n", path_name(file));
file->dir_ent.lcase &= ~FAT_NO_83NAME;
MODIFY(file, lcase, file->dir_ent.lcase);
}
return 0;
conjure:
memset(&file->dir_ent, 0, sizeof(DIR_ENT));
memcpy(file->dir_ent.name, ent, MSDOS_NAME);
fs_write(file->offset, sizeof(file->dir_ent), &file->dir_ent);
MODIFY_START(file, start, fs);
MODIFY(file, attr, ATTR_DIR);
return 0;
}
static int check_file(DOS_FS * fs, DOS_FILE * file)
{
DOS_FILE *owner;
int restart;
uint32_t parent, grandp, curr, this, clusters, prev, walk, clusters2;
if (IS_FREE(file->dir_ent.name))
return 0;
if (file->dir_ent.attr & ATTR_DIR) {
if (le32toh(file->dir_ent.size)) {
printf("%s\n Directory has non-zero size. Fixing it.\n",
path_name(file));
MODIFY(file, size, htole32(0));
}
if (FSTART(file, fs) == 0) {
printf("%s\n Start does point to root directory. Deleting dir. \n",
path_name(file));
MODIFY(file, name[0], DELETED_FLAG);
return 0;
}
if (file->parent) {
parent = FSTART(file->parent, fs);
grandp = file->parent->parent ? FSTART(file->parent->parent, fs) : 0;
if (fs->root_cluster && grandp == fs->root_cluster)
grandp = 0;
if (FSTART(file, fs) == parent) {
printf("%s\n Start does point to containing directory. Deleting entry.\n",
path_name(file));
MODIFY(file, name[0], DELETED_FLAG);
MODIFY_START(file, 0, fs);
return 0;
}
if (FSTART(file, fs) == grandp) {
printf("%s\n Start does point to containing directory's parent. Deleting entry.\n",
path_name(file));
MODIFY(file, name[0], DELETED_FLAG);
MODIFY_START(file, 0, fs);
return 0;
}
}
}
if (FSTART(file, fs) == 1) {
printf("%s\n Bad start cluster 1. Truncating file.\n",
path_name(file));
if (!file->offset)
die("Bad FAT32 root directory! (bad start cluster 1)\n");
MODIFY_START(file, 0, fs);
}
if (FSTART(file, fs) >= fs->data_clusters + 2) {
printf
("%s\n Start cluster beyond limit (%lu > %lu). Truncating file.\n",
path_name(file), (unsigned long)FSTART(file, fs),
(unsigned long)(fs->data_clusters + 1));
if (!file->offset)
die("Bad FAT32 root directory! (start cluster beyond limit: %lu > %lu)\n",
(unsigned long)FSTART(file, fs),
(unsigned long)(fs->data_clusters + 1));
MODIFY_START(file, 0, fs);
}
clusters = prev = 0;
for (curr = FSTART(file, fs) ? FSTART(file, fs) :
-1; curr != -1; curr = next_cluster(fs, curr)) {
FAT_ENTRY curEntry;
get_fat(&curEntry, fs->fat, curr, fs);
if (!curEntry.value || bad_cluster(fs, curr)) {
printf("%s\n Contains a %s cluster (%lu). Assuming EOF.\n",
path_name(file), curEntry.value ? "bad" : "free", (unsigned long)curr);
if (prev)
set_fat(fs, prev, -1);
else if (!file->offset)
die("FAT32 root dir starts with a bad cluster!");
else
MODIFY_START(file, 0, fs);
break;
}
if (!(file->dir_ent.attr & ATTR_DIR) && le32toh(file->dir_ent.size) <=
clusters * fs->cluster_size) {
printf
("%s\n File size is %u bytes, cluster chain length is > %u "
"bytes.\n Truncating file to %u bytes.\n", path_name(file),
le32toh(file->dir_ent.size),
(unsigned)clusters * fs->cluster_size,
le32toh(file->dir_ent.size));
truncate_file(fs, file, clusters);
break;
}
if ((owner = get_owner(fs, curr))) {
int do_trunc = 0;
printf("%s and\n", path_name(owner));
printf("%s\n share clusters.\n", path_name(file));
clusters2 = 0;
for (walk = FSTART(owner, fs); walk > 0 && walk != -1; walk =
next_cluster(fs, walk))
if (walk == curr)
break;
else {
if ((unsigned long long)clusters2 * fs->cluster_size >= UINT32_MAX)
die("Internal error: File size is larger than 2^32-1");
clusters2++;
}
restart = file->dir_ent.attr & ATTR_DIR;
if (!owner->offset) {
printf(" Truncating second to %u bytes because first "
"is FAT32 root dir.\n",
(unsigned)clusters * fs->cluster_size);
do_trunc = 2;
} else if (!file->offset) {
printf(" Truncating first to %u bytes because second "
"is FAT32 root dir.\n",
(unsigned)clusters2 * fs->cluster_size);
do_trunc = 1;
} else {
char *trunc_first_string;
char *trunc_second_string;
char *noninteractive_string;
xasprintf(&trunc_first_string,
"Truncate first to %u bytes%s",
(unsigned)clusters2 * fs->cluster_size,
restart ? " and restart" : "");
xasprintf(&trunc_second_string,
"Truncate second to %u bytes",
(unsigned)clusters * fs->cluster_size);
xasprintf(&noninteractive_string,
" Truncating second to %u bytes.",
(unsigned)clusters * fs->cluster_size);
do_trunc = get_choice(2, noninteractive_string,
2,
1, trunc_first_string,
2, trunc_second_string);
free(trunc_first_string);
free(trunc_second_string);
free(noninteractive_string);
}
if (do_trunc == 1) {
prev = 0;
clusters = 0;
for (this = FSTART(owner, fs); this > 0 && this != -1; this =
next_cluster(fs, this)) {
if (this == curr) {
if (prev)
set_fat(fs, prev, -1);
else
MODIFY_START(owner, 0, fs);
MODIFY(owner, size, htole32(clusters * fs->cluster_size));
if (restart)
return 1;
while (this > 0 && this != -1) {
set_owner(fs, this, NULL);
this = next_cluster(fs, this);
}
this = curr;
break;
}
if ((unsigned long long)clusters * fs->cluster_size >= UINT32_MAX)
die("Internal error: File size is larger than 2^32-1");
clusters++;
prev = this;
}
if (this != curr)
die("Internal error: didn't find cluster %d in chain"
" starting at %d", curr, FSTART(owner, fs));
} else {
if (prev)
set_fat(fs, prev, -1);
else
MODIFY_START(file, 0, fs);
break;
}
}
set_owner(fs, curr, file);
if ((unsigned long long)clusters * fs->cluster_size >= UINT32_MAX)
die("Internal error: File size is larger than 2^32-1");
clusters++;
prev = curr;
}
if (!(file->dir_ent.attr & ATTR_DIR) && le32toh(file->dir_ent.size) >
clusters * fs->cluster_size) {
printf
("%s\n File size is %u bytes, cluster chain length is %u bytes."
"\n Truncating file to %u bytes.\n", path_name(file),
le32toh(file->dir_ent.size),
(unsigned)clusters * fs->cluster_size,
(unsigned)clusters * fs->cluster_size);
MODIFY(file, size,
htole32(clusters * fs->cluster_size));
}
return 0;
}
static int check_files(DOS_FS * fs, DOS_FILE * start)
{
while (start) {
if (check_file(fs, start))
return 1;
start = start->next;
}
return 0;
}
static int check_dir(DOS_FS * fs, DOS_FILE ** root, int dots)
{
DOS_FILE *parent, **walk, **scan;
int skip, redo;
int good, bad;
if (!*root)
return 0;
parent = (*root)->parent;
good = bad = 0;
for (walk = root; *walk; walk = &(*walk)->next)
if (bad_name(*walk))
bad++;
else
good++;
if (*root && parent && good + bad > 4 && bad > good / 2) {
printf("%s\n Has a large number of bad entries. (%d/%d)\n",
path_name(parent), bad, good + bad);
if (!dots)
printf(" Not dropping root directory.\n");
else if (get_choice(2, " Not dropping it in auto-mode.",
2,
1, "Drop directory",
2, "Keep directory") == 1) {
truncate_file(fs, parent, 0);
MODIFY(parent, name[0], DELETED_FLAG);
/* buglet: deleted directory stays in the list. */
return 1;
}
}
redo = 0;
walk = root;
while (*walk) {
if (!((*walk)->dir_ent.attr & ATTR_VOLUME) && bad_name(*walk)) {
puts(path_name(*walk));
printf(" Bad short file name (%s).\n",
file_name((*walk)->dir_ent.name));
switch (get_choice(3, " Auto-renaming it.",
4,
1, "Drop file",
2, "Rename file",
3, "Auto-rename",
4, "Keep it")) {
case 1:
drop_file(fs, *walk);
walk = &(*walk)->next;
continue;
case 2:
rename_file(*walk);
redo = 1;
break;
case 3:
auto_rename(*walk);
printf(" Renamed to %s\n", file_name((*walk)->dir_ent.name));
break;
case 4:
break;
}
}
/* don't check for duplicates of the volume label */
if (!((*walk)->dir_ent.attr & ATTR_VOLUME)) {
scan = &(*walk)->next;
skip = 0;
while (*scan && !skip) {
if (!((*scan)->dir_ent.attr & ATTR_VOLUME) &&
!memcmp((*walk)->dir_ent.name, (*scan)->dir_ent.name,
MSDOS_NAME)) {
printf("%s\n Duplicate directory entry.\n First %s\n",
path_name(*walk), file_stat(*walk));
printf(" Second %s\n", file_stat(*scan));
switch (get_choice(6, " Auto-renaming second.",
6,
1, "Drop first",
2, "Drop second",
3, "Rename first",
4, "Rename second",
5, "Auto-rename first",
6, "Auto-rename second")) {
case 1:
drop_file(fs, *walk);
*walk = (*walk)->next;
skip = 1;
break;
case 2:
drop_file(fs, *scan);
*scan = (*scan)->next;
continue;
case 3:
rename_file(*walk);
printf(" Renamed to %s\n", path_name(*walk));
redo = 1;
break;
case 4:
rename_file(*scan);
printf(" Renamed to %s\n", path_name(*walk));
redo = 1;
break;
case 5:
auto_rename(*walk);
printf(" Renamed to %s\n",
file_name((*walk)->dir_ent.name));
break;
case 6:
auto_rename(*scan);
printf(" Renamed to %s\n",
file_name((*scan)->dir_ent.name));
break;
}
}
scan = &(*scan)->next;
}
if (skip)
continue;
}
if (!redo)
walk = &(*walk)->next;
else {
walk = root;
redo = 0;
}
}
return 0;
}
/**
* Check a dentry's cluster chain for bad clusters.
* If requested, we verify readability and mark unreadable clusters as bad.
*
* @param[inout] fs Information about the filesystem
* @param[in] file dentry to check
* @param[in] read_test Nonzero == verify that dentry's clusters can
* be read
*/
static void test_file(DOS_FS * fs, DOS_FILE * file, int read_test)
{
DOS_FILE *owner;
uint32_t walk, prev, clusters, next_clu;
prev = clusters = 0;
for (walk = FSTART(file, fs); walk > 1 && walk < fs->data_clusters + 2;
walk = next_clu) {
next_clu = next_cluster(fs, walk);
/* In this stage we are checking only for a loop within our own
* cluster chain.
* Cross-linking of clusters is handled in check_file()
*/
if ((owner = get_owner(fs, walk))) {
if (owner == file) {
printf("%s\n Circular cluster chain. Truncating to %lu "
"cluster%s.\n", path_name(file), (unsigned long)clusters,
clusters == 1 ? "" : "s");
if (prev)
set_fat(fs, prev, -1);
else if (!file->offset)
die("Bad FAT32 root directory! (bad start cluster)\n");
else
MODIFY_START(file, 0, fs);
}
break;
}
if (bad_cluster(fs, walk))
break;
if (read_test) {
if (fs_test(cluster_start(fs, walk), fs->cluster_size)) {
prev = walk;
clusters++;
} else {
printf("%s\n Cluster %lu (%lu) is unreadable. Skipping it.\n",
path_name(file), (unsigned long)clusters, (unsigned long)walk);
if (prev)
set_fat(fs, prev, next_cluster(fs, walk));
else
MODIFY_START(file, next_cluster(fs, walk), fs);
set_fat(fs, walk, -2);
}
} else {
prev = walk;
clusters++;
}
set_owner(fs, walk, file);
}
/* Revert ownership (for now) */
for (walk = FSTART(file, fs); walk > 1 && walk < fs->data_clusters + 2;
walk = next_cluster(fs, walk))
if (bad_cluster(fs, walk))
break;
else if (get_owner(fs, walk) == file)
set_owner(fs, walk, NULL);
else
break;
}
static void undelete(DOS_FS * fs, DOS_FILE * file)
{
uint32_t clusters, left, prev, walk;
clusters = left = (le32toh(file->dir_ent.size) + fs->cluster_size - 1) /
fs->cluster_size;
prev = 0;
walk = FSTART(file, fs);
while (left && (walk >= 2) && (walk < fs->data_clusters + 2)) {
FAT_ENTRY curEntry;
get_fat(&curEntry, fs->fat, walk, fs);
if (!curEntry.value)
break;
left--;
if (prev)
set_fat(fs, prev, walk);
prev = walk;
walk++;
}
if (prev)
set_fat(fs, prev, -1);
else
MODIFY_START(file, 0, fs);
if (left)
printf("Warning: Did only undelete %lu of %lu cluster%s.\n",
(unsigned long)clusters - left, (unsigned long)clusters, clusters == 1 ? "" : "s");
}
static void new_dir(void)
{
lfn_reset();
}
/**
* Create a description for a referenced dentry and insert it in our dentry
* tree. Then, go check the dentry's cluster chain for bad clusters and
* cluster loops.
*
* @param[inout] fs Information about the filesystem
* @param[out] chain
* @param[in] parent Information about parent directory of this file
* NULL == no parent ('file' is root directory)
* @param[in] offset Partition-relative byte offset of directory entry of interest
* 0 == Root directory
* @param cp
*/
static void add_file(DOS_FS * fs, DOS_FILE *** chain, DOS_FILE * parent,
off_t offset, FDSC ** cp)
{
DOS_FILE *new;
DIR_ENT de;
FD_TYPE type;
if (offset)
fs_read(offset, sizeof(DIR_ENT), &de);
else {
/* Construct a DIR_ENT for the root directory */
memset(&de, 0, sizeof de);
memcpy(de.name, " ", MSDOS_NAME);
de.attr = ATTR_DIR;
de.start = htole16(fs->root_cluster & 0xffff);
de.starthi = htole16((fs->root_cluster >> 16) & 0xffff);
}
if ((type = file_type(cp, (char *)de.name)) != fdt_none) {
if (type == fdt_undelete && (de.attr & ATTR_DIR))
die("Can't undelete directories.");
file_modify(cp, (char *)de.name);
fs_write(offset, 1, &de);
}
if (IS_FREE(de.name)) {
lfn_check_orphaned();
return;
}
if (de.attr == VFAT_LN_ATTR) {
lfn_add_slot(&de, offset);
return;
}
new = qalloc(&mem_queue, sizeof(DOS_FILE));
new->lfn = lfn_get(&de, &new->lfn_offset);
new->offset = offset;
memcpy(&new->dir_ent, &de, sizeof(de));
new->next = new->first = NULL;
new->parent = parent;
if (type == fdt_undelete)
undelete(fs, new);
**chain = new;
*chain = &new->next;
if (list) {
printf("Checking file %s", path_name(new));
if (new->lfn)
printf(" (%s)", file_name(new->dir_ent.name)); /* (8.3) */
printf("\n");
}
/* Don't include root directory in the total file count */
if (offset)
++n_files;
test_file(fs, new, test); /* Bad cluster check */
}
static int subdirs(DOS_FS * fs, DOS_FILE * parent, FDSC ** cp);
static int scan_dir(DOS_FS * fs, DOS_FILE * this, FDSC ** cp)
{
DOS_FILE **chain;
int i;
uint32_t clu_num;
chain = &this->first;
i = 0;
clu_num = FSTART(this, fs);
new_dir();
if (clu_num != 0 && clu_num != -1 && this->offset) {
DOS_FILE file;
file.lfn = NULL;
file.lfn_offset = 0;
file.next = NULL;
file.parent = this;
file.first = NULL;
file.offset = cluster_start(fs, clu_num) + (i % fs->cluster_size);
fs_read(file.offset, sizeof(DIR_ENT), &file.dir_ent);
if (handle_dot(fs, &file, 0))
return 1;
i += sizeof(DIR_ENT);
file.offset = cluster_start(fs, clu_num) + (i % fs->cluster_size);
fs_read(file.offset, sizeof(DIR_ENT), &file.dir_ent);
if (handle_dot(fs, &file, 1))
return 1;
i += sizeof(DIR_ENT);
}
while (clu_num > 0 && clu_num != -1) {
add_file(fs, &chain, this,
cluster_start(fs, clu_num) + (i % fs->cluster_size), cp);
i += sizeof(DIR_ENT);
if (!(i % fs->cluster_size))
if ((clu_num = next_cluster(fs, clu_num)) == 0 || clu_num == -1)
break;
}
lfn_check_orphaned();
if (check_dir(fs, &this->first, this->offset))
return 0;
if (check_files(fs, this->first))
return 1;
return subdirs(fs, this, cp);