static int64_t allocate_cluster(BlockDriverState *bs, int64_t sector_num) { BDRVParallelsState *s = bs->opaque; uint32_t idx, offset, tmp; int64_t pos; int ret; idx = sector_num / s->tracks; offset = sector_num % s->tracks; if (idx >= s->catalog_size) { return -EINVAL; } if (s->catalog_bitmap[idx] != 0) { return (uint64_t)s->catalog_bitmap[idx] * s->off_multiplier + offset; } pos = bdrv_getlength(bs->file) >> BDRV_SECTOR_BITS; if (s->has_truncate) { ret = bdrv_truncate(bs->file, (pos + s->tracks) << BDRV_SECTOR_BITS); } else { ret = bdrv_write_zeroes(bs->file, pos, s->tracks, 0); } if (ret < 0) { return ret; } s->catalog_bitmap[idx] = pos / s->off_multiplier; tmp = cpu_to_le32(s->catalog_bitmap[idx]); ret = bdrv_pwrite(bs->file, sizeof(ParallelsHeader) + idx * sizeof(tmp), &tmp, sizeof(tmp)); if (ret < 0) { s->catalog_bitmap[idx] = 0; return ret; } return (uint64_t)s->catalog_bitmap[idx] * s->off_multiplier + offset; }