C++ (Cpp) get_zfs_ioctl_version Examples

Example #1

File: libzfs_compat.c Project: 0xbda2d2f8/freebsd

/*
 * This is FreeBSD version of ioctl, because Solaris' ioctl() updates
 * zc_nvlist_dst_size even if an error is returned, on FreeBSD if an
 * error is returned zc_nvlist_dst_size won't be updated.
 */
int
zcmd_ioctl(int fd, int request, zfs_cmd_t *zc)
{
	size_t oldsize;
	int ret, cflag = ZFS_CMD_COMPAT_NONE;

	if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
		zfs_ioctl_version = get_zfs_ioctl_version();

	if (zfs_ioctl_version >= ZFS_IOCVER_DEADMAN) {
		switch (zfs_ioctl_version) {
		case ZFS_IOCVER_ZCMD:
			cflag = ZFS_CMD_COMPAT_ZCMD;
			break;
		case ZFS_IOCVER_LZC:
			cflag = ZFS_CMD_COMPAT_LZC;
			break;
		case ZFS_IOCVER_DEADMAN:
			cflag = ZFS_CMD_COMPAT_DEADMAN;
			break;
		}
	} else {
		/*
		 * If vfs.zfs.version.ioctl is not defined, assume we have v28
		 * compatible binaries and use vfs.zfs.version.spa to test for v15
		 */
		cflag = ZFS_CMD_COMPAT_V28;

		if (zfs_spa_version < 0)
			zfs_spa_version = get_zfs_spa_version();

		if (zfs_spa_version == SPA_VERSION_15 ||
		    zfs_spa_version == SPA_VERSION_14 ||
		    zfs_spa_version == SPA_VERSION_13)
			cflag = ZFS_CMD_COMPAT_V15;
	}

	oldsize = zc->zc_nvlist_dst_size;
	ret = zcmd_ioctl_compat(fd, request, zc, cflag);

	if (ret == 0 && oldsize < zc->zc_nvlist_dst_size) {
		ret = -1;
		errno = ENOMEM;
	}

	return (ret);
}

Example #2

File: libzfs_core.c Project: freebsd-riscv/freebsd

static int
lzc_ioctl(zfs_ioc_t ioc, const char *name,
    nvlist_t *source, nvlist_t **resultp)
{
	zfs_cmd_t zc = { 0 };
	int error = 0;
	char *packed;
#ifdef __FreeBSD__
	nvlist_t *oldsource;
#endif
	size_t size;

	ASSERT3S(g_refcount, >, 0);

	(void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));

#ifdef __FreeBSD__
	if (zfs_ioctl_version == ZFS_IOCVER_UNDEF)
		zfs_ioctl_version = get_zfs_ioctl_version();

	if (zfs_ioctl_version < ZFS_IOCVER_LZC) {
		oldsource = source;
		error = lzc_compat_pre(&zc, &ioc, &source);
		if (error)
			return (error);
	}
#endif

	packed = fnvlist_pack(source, &size);
	zc.zc_nvlist_src = (uint64_t)(uintptr_t)packed;
	zc.zc_nvlist_src_size = size;

	if (resultp != NULL) {
		*resultp = NULL;
		zc.zc_nvlist_dst_size = MAX(size * 2, 128 * 1024);
		zc.zc_nvlist_dst = (uint64_t)(uintptr_t)
		    malloc(zc.zc_nvlist_dst_size);
#ifdef illumos
		if (zc.zc_nvlist_dst == NULL) {
#else
		if (zc.zc_nvlist_dst == 0) {
#endif
			error = ENOMEM;
			goto out;
		}
	}

	while (ioctl(g_fd, ioc, &zc) != 0) {
		if (errno == ENOMEM && resultp != NULL) {
			free((void *)(uintptr_t)zc.zc_nvlist_dst);
			zc.zc_nvlist_dst_size *= 2;
			zc.zc_nvlist_dst = (uint64_t)(uintptr_t)
			    malloc(zc.zc_nvlist_dst_size);
#ifdef illumos
			if (zc.zc_nvlist_dst == NULL) {
#else
			if (zc.zc_nvlist_dst == 0) {
#endif
				error = ENOMEM;
				goto out;
			}
		} else {
			error = errno;
			break;
		}
	}

#ifdef __FreeBSD__
	if (zfs_ioctl_version < ZFS_IOCVER_LZC)
		lzc_compat_post(&zc, ioc);
#endif
	if (zc.zc_nvlist_dst_filled) {
		*resultp = fnvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst,
		    zc.zc_nvlist_dst_size);
	}
#ifdef __FreeBSD__
	if (zfs_ioctl_version < ZFS_IOCVER_LZC)
		lzc_compat_outnvl(&zc, ioc, resultp);
#endif
out:
#ifdef __FreeBSD__
	if (zfs_ioctl_version < ZFS_IOCVER_LZC) {
		if (source != oldsource)
			nvlist_free(source);
		source = oldsource;
	}
#endif
	fnvlist_pack_free(packed, size);
	free((void *)(uintptr_t)zc.zc_nvlist_dst);
	return (error);
}

int
lzc_create(const char *fsname, enum lzc_dataset_type type, nvlist_t *props)
{
	int error;
	nvlist_t *args = fnvlist_alloc();
	fnvlist_add_int32(args, "type", (dmu_objset_type_t)type);
	if (props != NULL)
		fnvlist_add_nvlist(args, "props", props);
	error = lzc_ioctl(ZFS_IOC_CREATE, fsname, args, NULL);
	nvlist_free(args);
	return (error);
}