int
vhd_io_allocate_blocks_fast(vhd_context_t *ctx, const uint32_t from_extent,
const uint32_t to_extent, const bool ignore_2tb_limit)
{
off64_t max;
int err, gap;
int i = 0;
int spp = getpagesize() >> VHD_SECTOR_SHIFT;
assert(ctx);
assert(from_extent <= to_extent);
err = vhd_end_of_data(ctx, &max);
if (err)
return err;
gap = 0;
max >>= VHD_SECTOR_SHIFT;
/* data region of segment should begin on page boundary */
if ((max + ctx->bm_secs) % spp) {
gap = (spp - ((max + ctx->bm_secs) % spp));
max += gap;
}
for (i = from_extent; i <= to_extent; i++) {
if (max > UINT_MAX && !ignore_2tb_limit) {
printf("sector offset for extent %u exceeds the 2 TB limit\n", i);
err = -EOVERFLOW;
goto out;
}
ctx->bat.bat[i] = max;
max += ctx->bm_secs + ctx->bat.spb;
if ((max + ctx->bm_secs) % spp) {
gap = (spp - ((max + ctx->bm_secs) % spp));
max += gap;
}
}
err = vhd_write_bat(ctx, &ctx->bat);
if (err)
goto out;
err = vhd_init_bitmaps(ctx, from_extent, to_extent);
if (err)
printf("failed to initialise bitmaps: %s\n", strerror(-err));
out:
return err;
}
static int
vhd_journal_restore_bat(vhd_journal_t *j, vhd_bat_t *bat)
{
return vhd_write_bat(&j->vhd, bat);
}
