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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>
+ Copyright (C) 2008-2013 Daniel Baumann <mail@daniel-baumann.ch>
+
+ 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, expanded, 8);
+ memcpy(de->ext, expanded + 8, 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((const char *)d2.name, (const char *)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) {
+ char expanded[12];
+ sprintf(expanded, pattern, curr_num);
+ memcpy(de->name, expanded, 8);
+ memcpy(de->ext, expanded + 8, 3);
+ for (scan = 0; scan < fs->root_entries; scan++)
+ if (scan != next_free &&
+ !strncmp((const char *)root[scan].name,
+ (const char *)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((const char *)name, "EA DATA SF", 11) == 0 ||
+ strncmp((const char *)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 lfn_remove(loff_t from, loff_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)
+{
+ unsigned long cluster;
+
+ MODIFY(file, name[0], DELETED_FLAG);
+ if (file->lfn)
+ lfn_remove(file->lfn_offset, file->offset);
+ 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, "%07lu", 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((const char *)walk->dir_ent.name,
+ (const char *)file->dir_ent.name, MSDOS_NAME))
+ break;
+ if (!walk) {
+ fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
+ if (file->lfn)
+ lfn_fix_checksum(file->lfn_offset, file->offset,
+ (const char *)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((char *)name, 45, stdin)) {
+ 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)) {
+ fs_write(file->offset, MSDOS_NAME, file->dir_ent.name);
+ if (file->lfn)
+ lfn_fix_checksum(file->lfn_offset, file->offset,
+ (const char *)file->dir_ent.name);
+ return;
+ }
+ }
+ }
+}
+
+static int handle_dot(DOS_FS * fs, DOS_FILE * file, int dots)
+{
+ char *name;
+
+ name =
+ strncmp((const char *)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((const char *)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((const char *)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 %llu 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
+ ((const char *)((*walk)->dir_ent.name), MSDOS_DOT, MSDOS_NAME)
+ || !strncmp((const char *)((*walk)->dir_ent.name), MSDOS_DOTDOT,
+ MSDOS_NAME)) {
+ if (handle_dot(fs, *walk, dots)) {
+ *walk = (*walk)->next;
+ continue;
+ }
+ if (!strncmp
+ ((const char *)((*walk)->dir_ent.name), MSDOS_DOT, MSDOS_NAME))
+ dot++;
+ else
+ dotdot++;
+ }
+ 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));
+ 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, (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, '.', or '..' in the total file count */
+ if (offset &&
+ strncmp((const char *)de.name, MSDOS_DOT, MSDOS_NAME) != 0 &&
+ strncmp((const char *)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((const char *)walk->dir_ent.name, MSDOS_DOT, MSDOS_NAME)
+ && strncmp((const char *)walk->dir_ent.name, MSDOS_DOTDOT,
+ MSDOS_NAME))
+ if (scan_dir(fs, walk, file_cd(cp, (char *)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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 10:27:39 +0000