int ext4_mbr_scan(struct ext4_blockdev *parent, struct ext4_mbr_bdevs *bdevs)
{
int r;
size_t i;
ext4_dbg(DEBUG_MBR, DBG_INFO "ext4_mbr_scan\n");
memset(bdevs, 0, sizeof(struct ext4_mbr_bdevs));
r = ext4_block_init(parent);
if (r != EOK)
return r;
r = ext4_block_readbytes(parent, 0, parent->bdif->ph_bbuf, 512);
if (r != EOK) {
goto blockdev_fini;
}
const struct ext4_mbr *mbr = (void *)parent->bdif->ph_bbuf;
if (to_le16(mbr->signature) != MBR_SIGNATURE) {
ext4_dbg(DEBUG_MBR, DBG_ERROR "ext4_mbr_scan: unknown "
"signature: 0x%x\n", to_le16(mbr->signature));
r = ENOENT;
goto blockdev_fini;
}
/*Show bootstrap code*/
ext4_dbg(DEBUG_MBR, "mbr_part: bootstrap:");
for (i = 0; i < sizeof(mbr->bootstrap); ++i) {
if (!(i & 0xF))
ext4_dbg(DEBUG_MBR | DEBUG_NOPREFIX, "\n");
ext4_dbg(DEBUG_MBR | DEBUG_NOPREFIX, "%02x, ", mbr->bootstrap[i]);
}
ext4_dbg(DEBUG_MBR | DEBUG_NOPREFIX, "\n\n");
for (i = 0; i < 4; ++i) {
const struct ext4_part_entry *pe = &mbr->part_entry[i];
ext4_dbg(DEBUG_MBR, "mbr_part: %d\n", (int)i);
ext4_dbg(DEBUG_MBR, "\tstatus: 0x%x\n", pe->status);
ext4_dbg(DEBUG_MBR, "\ttype 0x%x:\n", pe->type);
ext4_dbg(DEBUG_MBR, "\tfirst_lba: 0x%"PRIx32"\n", pe->first_lba);
ext4_dbg(DEBUG_MBR, "\tsectors: 0x%"PRIx32"\n", pe->sectors);
if (!pe->sectors)
continue; /*Empty entry*/
if (pe->type != 0x83)
continue; /*Unsupported entry. 0x83 - linux native*/
bdevs->partitions[i].bdif = parent->bdif;
bdevs->partitions[i].part_offset =
(uint64_t)pe->first_lba * parent->bdif->ph_bsize;
bdevs->partitions[i].part_size =
(uint64_t)pe->sectors * parent->bdif->ph_bsize;
}
blockdev_fini:
ext4_block_fini(parent);
return r;
}
int ext4_sb_read(struct ext4_blockdev *bdev, struct ext4_sblock *s)
{
return ext4_block_readbytes(bdev, EXT4_SUPERBLOCK_OFFSET, s,
EXT4_SUPERBLOCK_SIZE);
}
