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dosfstools/src/check.c
Alexander Korolkov f0a42d0634 dosfsck: don't complain about bad filenames when short filename 
contains 7 or more characters with codes 128-255, see Debian
bug #596327.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
2013-01-23 12:51:22 +01:00

966 lines
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/* check.c - Check and repair a PC/MS-DOS file system
Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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://www.gnu.org/licenses/>.
On Debian systems, 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 <Roman.Hodek@informatik.uni-erlangen.de> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <time.h>
#include "common.h"
#include "dosfsck.h"
#include "io.h"
#include "fat.h"
#include "file.h"
#include "lfn.h"
#include "check.h"
static DOS_FILE *root;
/* get start field of a dir entry */
#define FSTART(p,fs) \
((unsigned long)CF_LE_W(p->dir_ent.start) | \
(fs->fat_bits == 32 ? CF_LE_W(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 { \
unsigned long __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 = CT_LE_W(__v&0xffff); \
p->dir_ent.starthi = CT_LE_W(__v>>16); \
__v = CT_LE_L(__v); \
fs_write((loff_t)offsetof(struct boot_sector,root_cluster), \
sizeof(((struct boot_sector *)0)->root_cluster), \
&__v); \
} \
else { \
MODIFY(p,start,CT_LE_W((__v)&0xffff)); \
if (fs->fat_bits == 32) \
MODIFY(p,starthi,CT_LE_W((__v)>>16)); \
} \
} while(0)
loff_t alloc_rootdir_entry(DOS_FS *fs, DIR_ENT *de, const char *pattern)
{
static int curr_num = 0;
loff_t offset;
if (fs->root_cluster) {
DIR_ENT d2;
int i = 0, got = 0;
unsigned long clu_num, prev = 0;
loff_t offset2;
clu_num = fs->root_cluster;
offset = cluster_start(fs,clu_num);
while (clu_num > 0 && clu_num != -1) {
fs_read(offset,sizeof(DIR_ENT),&d2);
if (IS_FREE(d2.name) && d2.attr != VFAT_LN_ATTR) {
got = 1;
break;
}
i += sizeof(DIR_ENT);
offset += sizeof(DIR_ENT);
if ((i % fs->cluster_size) == 0) {
prev = clu_num;
if ((clu_num = next_cluster(fs,clu_num)) == 0 || clu_num == -1)
break;
offset = cluster_start(fs,clu_num);
}
}
if (!got) {
/* no free slot, need to extend root dir: alloc next free cluster
* after previous one */
if (!prev)
die("Root directory has no cluster allocated!");
for (clu_num = prev+1; clu_num != prev; clu_num++) {
FAT_ENTRY entry;
if (clu_num >= fs->clusters+2) clu_num = 2;
get_fat(&entry, fs->fat, clu_num, fs);
if (!entry.value)
break;
}
if (clu_num == prev)
die("Root directory full and no free cluster");
set_fat(fs,prev,clu_num);
set_fat(fs,clu_num,-1);
set_owner(fs, clu_num, get_owner(fs, fs->root_cluster));
/* clear new cluster */
memset( &d2, 0, sizeof(d2) );
offset = cluster_start(fs,clu_num);
for( i = 0; i < fs->cluster_size; i += sizeof(DIR_ENT) )
fs_write( offset+i, sizeof(d2), &d2 );
}
memset(de,0,sizeof(DIR_ENT));
while (1) {
char expanded[12];
sprintf(expanded, pattern, curr_num);
memcpy(de->name+4, expanded, 4);
memcpy(de->ext, expanded+4, 3);
clu_num = fs->root_cluster;
i = 0;
offset2 = cluster_start(fs,clu_num);
while (clu_num > 0 && clu_num != -1) {
fs_read(offset2,sizeof(DIR_ENT),&d2);
if (offset2 != offset &&
!strncmp(d2.name,de->name,MSDOS_NAME))
break;
i += sizeof(DIR_ENT);
offset2 += sizeof(DIR_ENT);
if ((i % fs->cluster_size) == 0) {
if ((clu_num = next_cluster(fs,clu_num)) == 0 ||
clu_num == -1)
break;
offset2 = cluster_start(fs,clu_num);
}
}
if (clu_num == 0 || clu_num == -1)
break;
if (++curr_num >= 10000) die("Unable to create unique name");
}
}
else {
DIR_ENT *root;
int next_free = 0, scan;
root = alloc(fs->root_entries*sizeof(DIR_ENT));
fs_read(fs->root_start,fs->root_entries*sizeof(DIR_ENT),root);
while (next_free < fs->root_entries)
if (IS_FREE(root[next_free].name) &&
root[next_free].attr != VFAT_LN_ATTR)
break;
else next_free++;
if (next_free == fs->root_entries)
die("Root directory is full.");
offset = fs->root_start+next_free*sizeof(DIR_ENT);
memset(de,0,sizeof(DIR_ENT));
while (1) {
sprintf(de->name,pattern,curr_num);
for (scan = 0; scan < fs->root_entries; scan++)
if (scan != next_free &&
!strncmp(root[scan].name,de->name,MSDOS_NAME))
break;
if (scan == fs->root_entries) break;
if (++curr_num >= 10000) die("Unable to create unique name");
}
free(root);
}
++n_files;
return offset;
}
/**
* 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_MAX*2];
if (!file) *path = 0; /* Reached the root directory */
else {
if (strlen(path_name(file->parent)) > PATH_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 int day_n[] = { 0,31,59,90,120,151,181,212,243,273,304,334,0,0,0,0 };
/* JanFebMarApr May Jun Jul Aug Sep Oct Nov Dec */
/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
time_t date_dos2unix(unsigned short time,unsigned short date)
{
int month,year;
time_t secs;
month = ((date >> 5) & 15)-1;
year = date >> 9;
secs = (time & 31)*2+60*((time >> 5) & 63)+(time >> 11)*3600+86400*
((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 &&
month < 2 ? 1 : 0)+3653);
/* days since 1.1.70 plus 80's leap day */
return secs;
}
static char *file_stat(DOS_FILE *file)
{
static char temp[100];
struct tm *tm;
char tmp[100];
time_t date;
date = date_dos2unix(CF_LE_W(file->dir_ent.time),CF_LE_W(file->
dir_ent.date));
tm = localtime(&date);
strftime(tmp,99,"%H:%M:%S %b %d %Y",tm);
sprintf(temp," Size %u bytes, date %s",CF_LE_L(file->dir_ent.size),tmp);
return temp;
}
static int bad_name(DOS_FILE *file)
{
int i, spc, suspicious = 0;
char *bad_chars = atari_format ? "*?\\/:" : "*?<>|\"\\/:";
unsigned char *name = file->dir_ent.name;
/* Do not complain about (and auto-correct) the extended attribute files
* of OS/2. */
if (strncmp(name,"EA DATA SF",11) == 0 ||
strncmp(name,"WP ROOT SF",11) == 0) return 0;
/* 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 < 8; i++) {
if (name[i] < ' ' || name[i] == 0x7f) return 1;
if (name[i] > 0x7f) ++suspicious;
if (strchr(bad_chars,name[i])) return 1;
}
for (i = 8; i < 11; i++) {
if (name[i] < ' ' || name[i] == 0x7f) return 1;
if (name[i] > 0x7f) ++suspicious;
if (strchr(bad_chars,name[i])) return 1;
}
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 = 8; i < 11; i++) {
if (name[i] == ' ')
spc = 1;
else if (spc)
/* non-space after a space not allowed, space terminates the name
* 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 drop_file(DOS_FS *fs,DOS_FILE *file)
{
unsigned long cluster;
MODIFY(file,name[0],DELETED_FLAG);
for (cluster = FSTART(file,fs); cluster > 0 && cluster <
fs->clusters+2; cluster = next_cluster(fs,cluster))
set_owner(fs,cluster,NULL);
--n_files;
}
static void truncate_file(DOS_FS *fs,DOS_FILE *file,unsigned long clusters)
{
int deleting;
unsigned long walk,next,prev;
walk = FSTART(file,fs);
prev = 0;
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);
prev = walk;
walk = next;
}
}
static void auto_rename(DOS_FILE *file)
{
DOS_FILE *first,*walk;
unsigned long int number;
if (!file->offset) return; /* cannot rename FAT32 root dir */
first = file->parent ? file->parent->first : root;
number = 0;
while (1) {
char num[8];
sprintf(num, "%07d", number);
memcpy(file->dir_ent.name, "FSCK", 4);
memcpy(file->dir_ent.name+4, num, 4);
memcpy(file->dir_ent.ext, num+4, 3);
for (walk = first; walk; walk = walk->next)
if (walk != file && !strncmp(walk->dir_ent.name,file->dir_ent.
name,MSDOS_NAME)) break;
if (!walk) {
fs_write(file->offset,MSDOS_NAME,file->dir_ent.name);
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) {
printf("New name: ");
fflush(stdout);
if (fgets(name,45,stdin)) {
if ((here = strchr(name,'\n'))) *here = 0;
for (walk = strrchr(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)) {
fs_write(file->offset,MSDOS_NAME,file->dir_ent.name);
return;
}
}
}
}
static int handle_dot(DOS_FS *fs,DOS_FILE *file,int dots)
{
char *name;
name = strncmp(file->dir_ent.name,MSDOS_DOT,MSDOS_NAME) ? ".." : ".";
if (!(file->dir_ent.attr & ATTR_DIR)) {
printf("%s\n Is a non-directory.\n",path_name(file));
if (interactive)
printf("1) Drop it\n2) Auto-rename\n3) Rename\n"
"4) Convert to directory\n");
else printf(" Auto-renaming it.\n");
switch (interactive ? get_key("1234","?") : '2') {
case '1':
drop_file(fs,file);
return 1;
case '2':
auto_rename(file);
printf(" Renamed to %s\n",file_name(file->dir_ent.name));
return 0;
case '3':
rename_file(file);
return 0;
case '4':
MODIFY(file,size,CT_LE_L(0));
MODIFY(file,attr,file->dir_ent.attr | ATTR_DIR);
break;
}
}
if (!dots) {
printf("Root contains directory \"%s\". Dropping it.\n",name);
drop_file(fs,file);
return 1;
}
return 0;
}
static int check_file(DOS_FS *fs,DOS_FILE *file)
{
DOS_FILE *owner;
int restart;
unsigned long expect,curr,this,clusters,prev,walk,clusters2;
if (file->dir_ent.attr & ATTR_DIR) {
if (CF_LE_L(file->dir_ent.size)) {
printf("%s\n Directory has non-zero size. Fixing it.\n",
path_name(file));
MODIFY(file,size,CT_LE_L(0));
}
if (file->parent && !strncmp(file->dir_ent.name,MSDOS_DOT,MSDOS_NAME)) {
expect = FSTART(file->parent,fs);
if (FSTART(file,fs) != expect) {
printf("%s\n Start (%ld) does not point to parent (%ld)\n",
path_name(file),FSTART(file,fs),expect);
MODIFY_START(file,expect,fs);
}
return 0;
}
if (file->parent && !strncmp(file->dir_ent.name,MSDOS_DOTDOT,
MSDOS_NAME)) {
expect = file->parent->parent ? FSTART(file->parent->parent,fs):0;
if (fs->root_cluster && expect == fs->root_cluster)
expect = 0;
if (FSTART(file,fs) != expect) {
printf("%s\n Start (%lu) does not point to .. (%lu)\n",
path_name(file),FSTART(file,fs),expect);
MODIFY_START(file,expect,fs);
}
return 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 (FSTART(file,fs) >= fs->clusters+2) {
printf("%s\n Start cluster beyond limit (%lu > %lu). Truncating file.\n",
path_name(file),FSTART(file,fs),fs->clusters+1);
if (!file->offset)
die( "Bad FAT32 root directory! (bad start cluster)\n" );
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",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) && CF_LE_L(file->dir_ent.size) <=
(unsigned long long)clusters*fs->cluster_size) {
printf("%s\n File size is %u bytes, cluster chain length is > %llu "
"bytes.\n Truncating file to %u bytes.\n",path_name(file),
CF_LE_L(file->dir_ent.size),(unsigned long long)clusters*fs->cluster_size,
CF_LE_L(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 clusters2++;
restart = file->dir_ent.attr & ATTR_DIR;
if (!owner->offset) {
printf( " Truncating second to %llu bytes because first "
"is FAT32 root dir.\n", (unsigned long long)clusters2*fs->cluster_size );
do_trunc = 2;
}
else if (!file->offset) {
printf( " Truncating first to %llu bytes because second "
"is FAT32 root dir.\n", (unsigned long long)clusters*fs->cluster_size );
do_trunc = 1;
}
else if (interactive)
printf("1) Truncate first to %llu bytes%s\n"
"2) Truncate second to %llu bytes\n",(unsigned long long)clusters*fs->cluster_size,
restart ? " and restart" : "",(unsigned long long)clusters2*fs->cluster_size);
else printf(" Truncating second to %llu bytes.\n",(unsigned long long)clusters2*
fs->cluster_size);
if (do_trunc != 2 &&
(do_trunc == 1 ||
(interactive && get_key("12","?") == '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,CT_LE_L((unsigned long long)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;
}
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);
clusters++;
prev = curr;
}
if (!(file->dir_ent.attr & ATTR_DIR) && CF_LE_L(file->dir_ent.size) >
(unsigned long long)clusters*fs->cluster_size) {
printf("%s\n File size is %u bytes, cluster chain length is %llu bytes."
"\n Truncating file to %lu bytes.\n",path_name(file),CF_LE_L(file->
dir_ent.size),(unsigned long long)clusters*fs->cluster_size,(unsigned long long)clusters*fs->cluster_size);
MODIFY(file,size,CT_LE_L((unsigned long long)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 dot,dotdot,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 (!interactive) printf(" Not dropping it in auto-mode.\n");
else if (get_key("yn","Drop directory ? (y/n)") == 'y') {
truncate_file(fs,parent,0);
MODIFY(parent,name[0],DELETED_FLAG);
/* buglet: deleted directory stays in the list. */
return 1;
}
}
dot = dotdot = redo = 0;
walk = root;
while (*walk) {
if (!strncmp((*walk)->dir_ent.name,MSDOS_DOT,MSDOS_NAME) ||
!strncmp((*walk)->dir_ent.name,MSDOS_DOTDOT,MSDOS_NAME)) {
if (handle_dot(fs,*walk,dots)) {
*walk = (*walk)->next;
continue;
}
if (!strncmp((*walk)->dir_ent.name,MSDOS_DOT,MSDOS_NAME)) dot++;
else dotdot++;
}
if (!((*walk)->dir_ent.attr & ATTR_VOLUME) &&
bad_name(*walk)) {
printf("%s\n Bad file name.\n",path_name(*walk));
if (interactive)
printf("1) Drop file\n2) Rename file\n3) Auto-rename\n"
"4) Keep it\n");
else printf(" Auto-renaming it.\n");
switch (interactive ? get_key("1234","?") : '3') {
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));
if (interactive)
printf("1) Drop first\n2) Drop second\n3) Rename first\n"
"4) Rename second\n5) Auto-rename first\n"
"6) Auto-rename second\n");
else printf(" Auto-renaming second.\n");
switch (interactive ? get_key("123456","?") : '6') {
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;
dot = dotdot = redo = 0;
}
}
if (dots && !dot)
printf("%s\n \".\" is missing. Can't fix this yet.\n",
path_name(parent));
if (dots && !dotdot)
printf("%s\n \"..\" is missing. Can't fix this yet.\n",
path_name(parent));
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;
unsigned long walk,prev,clusters,next_clu;
prev = clusters = 0;
for (walk = FSTART(file,fs); walk > 0 && walk < fs->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),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),clusters,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);
}
}
set_owner(fs,walk,file);
}
/* Revert ownership (for now) */
for (walk = FSTART(file,fs); walk > 0 && walk < fs->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)
{
unsigned long clusters,left,prev,walk;
clusters = left = (CF_LE_L(file->dir_ent.size)+fs->cluster_size-1)/
fs->cluster_size;
prev = 0;
walk = FSTART(file,fs);
while (left && (walk >= 2) && (walk < fs->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",clusters-left,
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,
loff_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 */
memcpy(de.name," ",MSDOS_NAME);
de.attr = ATTR_DIR;
de.size = de.time = de.date = 0;
de.start = CT_LE_W(fs->root_cluster & 0xffff);
de.starthi = CT_LE_W((fs->root_cluster >> 16) & 0xffff);
}
if ((type = file_type(cp,de.name)) != fdt_none) {
if (type == fdt_undelete && (de.attr & ATTR_DIR))
die("Can't undelete directories.");
file_modify(cp,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->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, '.', or '..' in the total file count */
if (offset &&
strncmp(de.name,MSDOS_DOT,MSDOS_NAME) != 0 &&
strncmp(de.name,MSDOS_DOTDOT,MSDOS_NAME) != 0)
++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;
unsigned long clu_num;
chain = &this->first;
i = 0;
clu_num = FSTART(this,fs);
new_dir();
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);
}
/**
* Recursively scan subdirectories of the specified parent directory.
*
* @param[inout] fs Information about the filesystem
* @param[in] parent Identifies the directory to scan
* @param[in] cp
*
* @return 0 Success
* @return 1 Error
*/
static int subdirs(DOS_FS *fs,DOS_FILE *parent,FDSC **cp)
{
DOS_FILE *walk;
for (walk = parent ? parent->first : root; walk; walk = walk->next)
if (walk->dir_ent.attr & ATTR_DIR)
if (strncmp(walk->dir_ent.name,MSDOS_DOT,MSDOS_NAME) &&
strncmp(walk->dir_ent.name,MSDOS_DOTDOT,MSDOS_NAME))
if (scan_dir(fs,walk,file_cd(cp,walk->dir_ent.name))) return 1;
return 0;
}
/**
* Scan all directory and file information for errors.
*
* @param[inout] fs Information about the filesystem
*
* @return 0 Success
* @return 1 Error
*/
int scan_root(DOS_FS *fs)
{
DOS_FILE **chain;
int i;
root = NULL;
chain = &root;
new_dir();
if (fs->root_cluster) {
add_file(fs,&chain,NULL,0,&fp_root);
}
else {
for (i = 0; i < fs->root_entries; i++)
add_file(fs,&chain,NULL,fs->root_start+i*sizeof(DIR_ENT),&fp_root);
}
lfn_check_orphaned();
(void) check_dir(fs,&root,0);
if (check_files(fs,root)) return 1;
return subdirs(fs,NULL,&fp_root);
}
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