int msdos_partition(struct parsed_partitions *state)
{
sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
Sector sect;
unsigned char *data;
struct partition *p;
struct fat_boot_sector *fb;
int slot;
data = read_part_sector(state, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
if (aix_magic_present(state, data)) {
put_dev_sector(sect);
printk( " [AIX]");
return 0;
}
/*
* Now that the 55aa signature is present, this is probably
* either the boot sector of a FAT filesystem or a DOS-type
* partition table. Reject this in case the boot indicator
* is not 0 or 0x80.
*/
p = (struct partition *) (data + 0x1be);
for (slot = 1; slot <= 4; slot++, p++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
/*
* Even without a valid boot inidicator value
* its still possible this is valid FAT filesystem
* without a partition table.
*/
fb = (struct fat_boot_sector *) data;
if (slot == 1 && fb->reserved && fb->fats
&& fat_valid_media(fb->media)) {
printk("\n");
put_dev_sector(sect);
return 1;
} else {
put_dev_sector(sect);
return 0;
}
}
}
#ifdef CONFIG_EFI_PARTITION
p = (struct partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
put_dev_sector(sect);
return 0;
}
}
#endif
p = (struct partition *) (data + 0x1be);
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
state->next = 5;
for (slot = 1 ; slot <= 4 ; slot++, p++) {
sector_t start = start_sect(p)*sector_size;
sector_t size = nr_sects(p)*sector_size;
if (!size)
continue;
if (is_extended_partition(p)) {
/*
* prevent someone doing mkfs or mkswap on an
* extended partition, but leave room for LILO
* FIXME: this uses one logical sector for > 512b
* sector, although it may not be enough/proper.
*/
sector_t n = 2;
n = min(size, max(sector_size, n));
put_partition(state, slot, start, n);
printk(" <");
parse_extended(state, start, size);
printk(" >");
continue;
}
put_partition(state, slot, start, size);
if (SYS_IND(p) == LINUX_RAID_PARTITION)
state->parts[slot].flags = ADDPART_FLAG_RAID;
if (SYS_IND(p) == DM6_PARTITION)
printk("[DM]");
if (SYS_IND(p) == EZD_PARTITION)
printk("[EZD]");
}
printk("\n");
/* second pass - output for each on a separate line */
p = (struct partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
unsigned char id = SYS_IND(p);
int n;
if (!nr_sects(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (!subtypes[n].parse)
continue;
subtypes[n].parse(state, start_sect(p) * sector_size,
nr_sects(p) * sector_size, slot);
}
put_dev_sector(sect);
return 1;
}
int blkdev_refresh(blkdev_t *blk)
{
int fd = 0;
char *devpath = NULL;
unsigned char *block = NULL;
int i, rc;
if (!(block = malloc(512)))
goto out;
/*
* Get the device size
*/
devpath = blkdev_get_devpath(blk);
if ((fd = open(devpath, O_RDONLY)) < 0) {
LOGE("Unable to open device '%s' (%s)", devpath, strerror(errno));
return -errno;
}
if (ioctl(fd, BLKGETSIZE, &blk->nr_sec)) {
LOGE("Unable to get device size (%m)");
return -errno;
}
close(fd);
free(devpath);
/*
* Open the disk partition table
*/
devpath = blkdev_get_devpath(blk->disk);
if ((fd = open(devpath, O_RDONLY)) < 0) {
LOGE("Unable to open device '%s' (%s)", devpath,
strerror(errno));
free(devpath);
return -errno;
}
free(devpath);
if ((rc = read(fd, block, 512)) != 512) {
LOGE("Unable to read device partition table (%d, %s)",
rc, strerror(errno));
goto out;
}
/*
* If we're a disk, then process the partition table. Otherwise we're
* a partition so get the partition type
*/
if (blk->type == blkdev_disk) {
blk->nr_parts = 0;
if ((block[0x1fe] != 0x55) || (block[0x1ff] != 0xAA)) {
LOGI("Disk %d:%d does not contain a partition table",
blk->major, blk->minor);
goto out;
}
for (i = 0; i < 4; i++) {
struct dos_partition part;
dos_partition_dec(block + DOSPARTOFF + i * sizeof(struct dos_partition), &part);
if (part.dp_flag != 0 && part.dp_flag != 0x80) {
struct fat_boot_sector *fb = (struct fat_boot_sector *) &block[0];
if (!i && fb->reserved && fb->fats && fat_valid_media(fb->media)) {
LOGI("Detected FAT filesystem in partition table");
break;
} else {
LOGI("Partition table looks corrupt");
break;
}
}
if (part.dp_size != 0 && part.dp_typ != 0)
blk->nr_parts++;
}
} else if (blk->type == blkdev_partition) {
struct dos_partition part;
int part_no = blk->minor -1;
if (part_no < 4) {
dos_partition_dec(block + DOSPARTOFF + part_no * sizeof(struct dos_partition), &part);
blk->part_type = part.dp_typ;
} else {
LOGW("Skipping partition %d", part_no);
}
}
out:
if (block)
free(block);
char tmp[255];
char tmp2[32];
sprintf(tmp, "%s (blkdev %d:%d), %u secs (%u MB)",
(blk->type == blkdev_disk ? "Disk" : "Partition"),
blk->major, blk->minor,
blk->nr_sec,
(uint32_t) (((uint64_t) blk->nr_sec * 512) / 1024) / 1024);
if (blk->type == blkdev_disk)
sprintf(tmp2, " %d partitions", blk->nr_parts);
else
sprintf(tmp2, " type 0x%x", blk->part_type);
strcat(tmp, tmp2);
LOGI(tmp);
close(fd);
return 0;
}
