Function ztest_io

freebsd/contrib/openzfs/cmd/ztest/ztest.c:2605–2688

}

static void
ztest_io(ztest_ds_t *zd, uint64_t object, uint64_t offset)
{
	int err;
	ztest_block_tag_t wbt;
	dmu_object_info_t doi;
	enum ztest_io_type io_type;
	uint64_t blocksize;
	void *data;

	VERIFY(dmu_object_info(zd->zd_os, object, &doi) == 0);
	blocksize = doi.doi_data_block_size;
	data = umem_alloc(blocksize, UMEM_NOFAIL);

	/*
	 * Pick an i/o type at random, biased toward writing block tags.
	 */
	io_type = ztest_random(ZTEST_IO_TYPES);
	if (ztest_random(2) == 0)
		io_type = ZTEST_IO_WRITE_TAG;

	(void) pthread_rwlock_rdlock(&zd->zd_zilog_lock);

	switch (io_type) {

	case ZTEST_IO_WRITE_TAG:
		ztest_bt_generate(&wbt, zd->zd_os, object, doi.doi_dnodesize,
		    offset, 0, 0, 0);
		(void) ztest_write(zd, object, offset, sizeof (wbt), &wbt);
		break;

	case ZTEST_IO_WRITE_PATTERN:
		(void) memset(data, 'a' + (object + offset) % 5, blocksize);
		if (ztest_random(2) == 0) {
			/*
			 * Induce fletcher2 collisions to ensure that
			 * zio_ddt_collision() detects and resolves them
			 * when using fletcher2-verify for deduplication.
			 */
			((uint64_t *)data)[0] ^= 1ULL << 63;
			((uint64_t *)data)[4] ^= 1ULL << 63;
		}
		(void) ztest_write(zd, object, offset, blocksize, data);
		break;

	case ZTEST_IO_WRITE_ZEROES:
		bzero(data, blocksize);
		(void) ztest_write(zd, object, offset, blocksize, data);
		break;

	case ZTEST_IO_TRUNCATE:
		(void) ztest_truncate(zd, object, offset, blocksize);
		break;

	case ZTEST_IO_SETATTR:
		(void) ztest_setattr(zd, object);
		break;
	default: