Function ztest_dmu_prealloc

freebsd/contrib/openzfs/cmd/ztest/ztest.c:5074–5114

}

void
ztest_dmu_prealloc(ztest_ds_t *zd, uint64_t id)
{
	ztest_od_t *od;
	uint64_t offset = (1ULL << (ztest_random(4) + SPA_MAXBLOCKSHIFT)) +
	    (ztest_random(ZTEST_RANGE_LOCKS) << SPA_MAXBLOCKSHIFT);
	uint64_t count = ztest_random(20) + 1;
	uint64_t blocksize = ztest_random_blocksize();
	void *data;

	od = umem_alloc(sizeof (ztest_od_t), UMEM_NOFAIL);

	ztest_od_init(od, id, FTAG, 0, DMU_OT_UINT64_OTHER, blocksize, 0, 0);

	if (ztest_object_init(zd, od, sizeof (ztest_od_t),
	    !ztest_random(2)) != 0) {
		umem_free(od, sizeof (ztest_od_t));
		return;
	}

	if (ztest_truncate(zd, od->od_object, offset, count * blocksize) != 0) {
		umem_free(od, sizeof (ztest_od_t));
		return;
	}

	ztest_prealloc(zd, od->od_object, offset, count * blocksize);

	data = umem_zalloc(blocksize, UMEM_NOFAIL);

	while (ztest_random(count) != 0) {
		uint64_t randoff = offset + (ztest_random(count) * blocksize);
		if (ztest_write(zd, od->od_object, randoff, blocksize,
		    data) != 0)
			break;
		while (ztest_random(4) != 0)
			ztest_io(zd, od->od_object, randoff);
	}

	umem_free(data, blocksize);
	umem_free(od, sizeof (ztest_od_t));
}

/*
 * Verify that zap_{create,destroy,add,remove,update} work as expected.