Function vdev_raidz_impl_set

freebsd/contrib/openzfs/module/zfs/vdev_raidz_math.c:582–629

* Function sets desired raidz implementation. * * If we are called before init(), user preference will be saved in * user_sel_impl, and applied in later init() call. This occurs when module * parameter is specified on module load. Otherwise, directly update * zfs_vdev_raidz_impl. * * @val Name of raidz implementation to use * @param Unused. */

 * @param	Unused.
 */
int
vdev_raidz_impl_set(const char *val)
{
	int err = -EINVAL;
	char req_name[RAIDZ_IMPL_NAME_MAX];
	uint32_t impl = RAIDZ_IMPL_READ(user_sel_impl);
	size_t i;

	/* sanitize input */
	i = strnlen(val, RAIDZ_IMPL_NAME_MAX);
	if (i == 0 || i == RAIDZ_IMPL_NAME_MAX)
		return (err);

	strlcpy(req_name, val, RAIDZ_IMPL_NAME_MAX);
	while (i > 0 && !!isspace(req_name[i-1]))
		i--;
	req_name[i] = '\0';

	/* Check mandatory options */
	for (i = 0; i < ARRAY_SIZE(math_impl_opts); i++) {
		if (strcmp(req_name, math_impl_opts[i].name) == 0) {
			impl = math_impl_opts[i].sel;
			err = 0;
			break;
		}
	}

	/* check all supported impl if init() was already called */
	if (err != 0 && raidz_math_initialized) {
		/* check all supported implementations */
		for (i = 0; i < raidz_supp_impl_cnt; i++) {
			if (strcmp(req_name, raidz_supp_impl[i]->name) == 0) {
				impl = i;
				err = 0;
				break;
			}
		}
	}

	if (err == 0) {
		if (raidz_math_initialized)
			atomic_swap_32(&zfs_vdev_raidz_impl, impl);
		else
			atomic_swap_32(&user_sel_impl, impl);
	}

	return (err);
}

#if defined(_KERNEL) && defined(__linux__)