static int probe_superblocks(blkid_probe pr)
{
struct stat st;
int rc;
if (fstat(blkid_probe_get_fd(pr), &st))
return -1;
blkid_probe_enable_partitions(pr, 1);
if (!S_ISCHR(st.st_mode) &&
blkid_probe_get_size(pr) <= 1024 * 1440 &&
blkid_probe_is_wholedisk(pr)) {
/*
* check if the small disk is partitioned, if yes then
* don't probe for filesystems.
*/
blkid_probe_enable_superblocks(pr, 0);
rc = blkid_do_fullprobe(pr);
if (rc < 0)
return rc; /* -1 = error, 1 = nothing, 0 = success */
if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
return 0; /* partition table detected */
}
blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
blkid_probe_enable_superblocks(pr, 1);
return blkid_do_safeprobe(pr);
}
static int probe_viaraid(blkid_probe pr, const struct blkid_idmag *mag)
{
uint64_t off;
struct via_metadata *v;
if (pr->size < 0x10000)
return -1;
if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
return -1;
off = ((pr->size / 0x200)-1) * 0x200;
v = (struct via_metadata *)
blkid_probe_get_buffer(pr,
off,
sizeof(struct via_metadata));
if (!v)
return -1;
if (le16_to_cpu(v->signature) != VIA_SIGNATURE)
return -1;
if (v->version_number > 2)
return -1;
if (!via_checksum(v))
return -1;
if (blkid_probe_sprintf_version(pr, "%u", v->version_number) != 0)
return -1;
if (blkid_probe_set_magic(pr, off,
sizeof(v->signature),
(unsigned char *) &v->signature))
return -1;
return 0;
}
static void blkid_fill_info(struct device_info *info, blkid_probe pr)
{
blkid_partlist plist;
if (device_info_verbose >= 3)
printf("blkid_fill_info()\n");
if (blkid_probe_is_wholedisk(pr))
info->partition = 0;
else
info->partition = 1;
plist = blkid_probe_get_partitions(pr);
if (plist && blkid_partlist_numof_partitions(plist))
info->has_children = 1;
}
static int fat_valid_superblock(blkid_probe pr,
const struct blkid_idmag *mag,
struct msdos_super_block *ms,
struct vfat_super_block *vs,
uint32_t *cluster_count, uint32_t *fat_size)
{
uint16_t sector_size, dir_entries, reserved;
uint32_t sect_count, __fat_size, dir_size, __cluster_count, fat_length;
uint32_t max_count;
/* extra check for FATs without magic strings */
if (mag->len <= 2) {
/* Old floppies have a valid MBR signature */
if (ms->ms_pmagic[0] != 0x55 || ms->ms_pmagic[1] != 0xAA)
return 0;
/*
* OS/2 and apparently DFSee will place a FAT12/16-like
* pseudo-superblock in the first 512 bytes of non-FAT
* filesystems --- at least JFS and HPFS, and possibly others.
* So we explicitly check for those filesystems at the
* FAT12/16 filesystem magic field identifier, and if they are
* present, we rule this out as a FAT filesystem, despite the
* FAT-like pseudo-header.
*/
if ((memcmp(ms->ms_magic, "JFS ", 8) == 0) ||
(memcmp(ms->ms_magic, "HPFS ", 8) == 0))
return 0;
}
/* fat counts(Linux kernel expects at least 1 FAT table) */
if (!ms->ms_fats)
return 0;
if (!ms->ms_reserved)
return 0;
if (!(0xf8 <= ms->ms_media || ms->ms_media == 0xf0))
return 0;
if (!is_power_of_2(ms->ms_cluster_size))
return 0;
sector_size = unaligned_le16(&ms->ms_sector_size);
if (!is_power_of_2(sector_size) ||
sector_size < 512 || sector_size > 4096)
return 0;
dir_entries = unaligned_le16(&ms->ms_dir_entries);
reserved = le16_to_cpu(ms->ms_reserved);
sect_count = unaligned_le16(&ms->ms_sectors);
if (sect_count == 0)
sect_count = le32_to_cpu(ms->ms_total_sect);
fat_length = le16_to_cpu(ms->ms_fat_length);
if (fat_length == 0)
fat_length = le32_to_cpu(vs->vs_fat32_length);
__fat_size = fat_length * ms->ms_fats;
dir_size = ((dir_entries * sizeof(struct vfat_dir_entry)) +
(sector_size-1)) / sector_size;
__cluster_count = (sect_count - (reserved + __fat_size + dir_size)) /
ms->ms_cluster_size;
if (!ms->ms_fat_length && vs->vs_fat32_length)
max_count = FAT32_MAX;
else
max_count = __cluster_count > FAT12_MAX ? FAT16_MAX : FAT12_MAX;
if (__cluster_count > max_count)
return 0;
if (fat_size)
*fat_size = __fat_size;
if (cluster_count)
*cluster_count = __cluster_count;
#if 0
if (blkid_probe_is_wholedisk(pr)) {
/* OK, seems like FAT, but it's possible that we found boot
* sector with crazy FAT-like stuff (magic strings, media,
* etc..) before MBR. Let's make sure that there is no MBR with
* usable partition. */
unsigned char *buf = (unsigned char *) ms;
if (mbr_is_valid_magic(buf)) {
struct dos_partition *p0 = mbr_get_partition(buf, 0);
if (dos_partition_get_size(p0) != 0 &&
(p0->boot_ind == 0 || p0->boot_ind == 0x80))
return 0;
}
}
#endif
return 1; /* valid */
}
static struct wipe_desc *
do_wipe(struct wipe_desc *wp, const char *devname, int flags)
{
int mode = O_RDWR, reread = 0, need_force = 0;
blkid_probe pr;
struct wipe_desc *w, *wp0;
int zap = (flags & WP_FL_ALL) ? 1 : wp->zap;
char *backup = NULL;
if (!(flags & WP_FL_FORCE))
mode |= O_EXCL;
pr = new_probe(devname, mode);
if (!pr)
return NULL;
if (zap && (flags & WP_FL_BACKUP)) {
const char *home = getenv ("HOME");
char *tmp = xstrdup(devname);
if (!home)
errx(EXIT_FAILURE, _("failed to create a signature backup, $HOME undefined"));
xasprintf (&backup, "%s/wipefs-%s-", home, basename(tmp));
free(tmp);
}
wp0 = clone_offset(wp);
while (blkid_do_probe(pr) == 0) {
wp = get_desc_for_probe(wp, pr);
if (!wp)
break;
/* Check if offset is in provided list */
w = wp0;
while(w && w->offset != wp->offset)
w = w->next;
if (wp0 && !w)
continue;
/* Mark done if found in provided list */
if (w)
w->on_disk = wp->on_disk;
if (!wp->on_disk)
continue;
if (!(flags & WP_FL_FORCE)
&& wp->is_parttable
&& !blkid_probe_is_wholedisk(pr)) {
warnx(_("%s: ignoring nested \"%s\" partition table "
"on non-whole disk device"), devname, wp->type);
need_force = 1;
continue;
}
if (zap) {
if (backup)
do_backup(wp, backup);
do_wipe_real(pr, devname, wp, flags);
if (wp->is_parttable)
reread = 1;
}
}
for (w = wp0; w != NULL; w = w->next) {
if (!w->on_disk && !(flags & WP_FL_QUIET))
warnx(_("%s: offset 0x%jx not found"), devname, (uintmax_t)w->offset);
}
if (need_force)
warnx(_("Use the --force option to force erase."));
fsync(blkid_probe_get_fd(pr));
#ifdef BLKRRPART
if (reread && (mode & O_EXCL))
rereadpt(blkid_probe_get_fd(pr), devname);
#endif
close(blkid_probe_get_fd(pr));
blkid_free_probe(pr);
free_wipe(wp0);
free(backup);
return wp;
}
