int get_header(server *srv, chunkqueue *cq, vhd_state_t *state, off_t *curr_off)
{
int err;
vhd_context_t *vhd;
off_t off;
uint32_t vhd_blks;
vhd = &state->vhd;
off = vhd->footer.data_offset;
err = fill(srv, cq, &vhd->header, sizeof(vhd_header_t), off, curr_off);
if (err)
return err;
if (*curr_off < off + sizeof(vhd_header_t))
return 0;
DEBUGLOG("s", "Header all in");
vhd_header_in(&vhd->header);
err = vhd_validate_header(&vhd->header);
if (err) {
LOG("sd", "ERROR: VHD header invalid:", err);
return err;
}
vhd->spb = vhd->header.block_size >> VHD_SECTOR_SHIFT;
vhd->bm_secs = secs_round_up_no_zero(vhd->spb >> 3);
vhd_blks = vhd->footer.curr_size >> VHD_BLOCK_SHIFT;
vhd->bat.spb = vhd->header.block_size >> VHD_SECTOR_SHIFT;
vhd->bat.entries = vhd_blks;
LOG("sOsDsd", "VHD virt size:", vhd->footer.curr_size, "; blocks:",
vhd_blks, "; max BAT size:", vhd->header.max_bat_size);
if (vhd->header.max_bat_size < vhd_blks) {
LOG("s", "ERROR: BAT smaller than VHD size!");
return -EINVAL;
}
state->bat_buf_size = vhd_bytes_padded(vhd_blks * sizeof(uint32_t));
err = posix_memalign((void **)&vhd->bat.bat, VHD_SECTOR_SIZE,
state->bat_buf_size);
if (err) {
LOG("sd", "ERROR: failed to allocate BAT buffer:", err);
return err;
}
state->curr_bitmap = malloc(vhd->bm_secs << VHD_SECTOR_SHIFT);
if (!state->curr_bitmap) {
LOG("sd", "ERROR: failed to allocate bitmap buffer!");
return -ENOMEM;
}
return 0;
}
static int
vhd_journal_read_header(vhd_journal_t *j, vhd_header_t *header)
{
int err;
vhd_journal_entry_t entry;
err = vhd_journal_read_entry(j, &entry);
if (err)
return err;
if (entry.type != VHD_JOURNAL_ENTRY_TYPE_HEADER)
return -EINVAL;
if (entry.size != sizeof(vhd_header_t))
return -EINVAL;
err = vhd_journal_read(j, header, entry.size);
if (err)
return err;
vhd_header_in(header);
return vhd_validate_header(header);
}
