C++ zfs_prop_get函数代码示例

int
libzfs_dataset_cmp(const void *a, const void *b)
{
	zfs_handle_t **za = (zfs_handle_t **)a;
	zfs_handle_t **zb = (zfs_handle_t **)b;
	char mounta[MAXPATHLEN];
	char mountb[MAXPATHLEN];
	boolean_t gota, gotb;

	if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
		verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
		    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
	if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
		verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
		    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);

	if (gota && gotb)
		return (strcmp(mounta, mountb));

	if (gota)
		return (-1);
	if (gotb)
		return (1);

	return (strcmp(zfs_get_name(a), zfs_get_name(b)));
}

static char *
get_zfs_dataset(sa_handle_impl_t impl_handle, char *path,
    boolean_t search_mnttab)
{
	size_t i, count = 0;
	char *dataset = NULL;
	zfs_handle_t **zlist;
	char mountpoint[ZFS_MAXPROPLEN];
	char canmount[ZFS_MAXPROPLEN];

	get_all_filesystems(impl_handle, &zlist, &count);
	qsort(zlist, count, sizeof (void *), mountpoint_compare);
	for (i = 0; i < count; i++) {
		/* must have a mountpoint */
		if (zfs_prop_get(zlist[i], ZFS_PROP_MOUNTPOINT, mountpoint,
		    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) != 0) {
			/* no mountpoint */
			continue;
		}

		/* mountpoint must be a path */
		if (strcmp(mountpoint, ZFS_MOUNTPOINT_NONE) == 0 ||
		    strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
			/*
			 * Search mmttab for mountpoint and get dataset.
			 */

			if (search_mnttab == B_TRUE &&
			    get_legacy_mountpoint(path, mountpoint,
			    sizeof (mountpoint), NULL, 0) == 0) {
				dataset = mountpoint;
				break;
			}
			continue;
		}

		/* canmount must be set */
		canmount[0] = '\0';
		if (zfs_prop_get(zlist[i], ZFS_PROP_CANMOUNT, canmount,
		    sizeof (canmount), NULL, NULL, 0, B_FALSE) != 0 ||
		    strcmp(canmount, "off") == 0)
			continue;

		/*
		 * have a mountable handle but want to skip those marked none
		 * and legacy
		 */
		if (strcmp(mountpoint, path) == 0) {
			dataset = (char *)zfs_get_name(zlist[i]);
			break;
		}

	}

	if (dataset != NULL)
		dataset = strdup(dataset);

	return (dataset);
}

static int
update_zfs_shares_cb(zfs_handle_t *zhp, void *pcookie)
{
	update_cookie_t *udata = (update_cookie_t *)pcookie;
	char mountpoint[ZFS_MAXPROPLEN];
	char shareopts[ZFS_MAXPROPLEN];
	char *dataset;
	zfs_type_t type = zfs_get_type(zhp);

	if (type == ZFS_TYPE_FILESYSTEM &&
	    zfs_iter_filesystems(zhp, update_zfs_shares_cb, pcookie) != 0) {
		zfs_close(zhp);
		return (1);
	}

	if (type != ZFS_TYPE_FILESYSTEM) {
		zfs_close(zhp);
		return (0);
	}

	if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint,
	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) != 0) {
		zfs_close(zhp);
		return (0);
	}

	dataset = (char *)zfs_get_name(zhp);

	if (dataset == NULL) {
		zfs_close(zhp);
		return (0);
	}

	if (!zfs_is_mounted(zhp, NULL)) {
		zfs_close(zhp);
		return (0);
	}

	if ((udata->proto == NULL || strcmp(udata->proto, "nfs") == 0) &&
	    zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts,
	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0 &&
	    strcmp(shareopts, "off") != 0) {
		(void) process_share(udata->handle, NULL, mountpoint, NULL,
		    "nfs", shareopts, NULL, dataset, B_FALSE);
	}

	if ((udata->proto == NULL || strcmp(udata->proto, "smb") == 0) &&
	    zfs_prop_get(zhp, ZFS_PROP_SHARESMB, shareopts,
	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) == 0 &&
	    strcmp(shareopts, "off") != 0) {
		(void) process_share(udata->handle, NULL, mountpoint, NULL,
		    "smb", shareopts, NULL, dataset, B_FALSE);
	}

	zfs_close(zhp);

	return (0);
}

static int
mountpoint_compare(const void *a, const void *b)
{
	zfs_handle_t **za = (zfs_handle_t **)a;
	zfs_handle_t **zb = (zfs_handle_t **)b;
	char mounta[MAXPATHLEN];
	char mountb[MAXPATHLEN];

	verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
	    sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
	verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
	    sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);

	return (strcmp(mounta, mountb));
}

/*
 * Returns true if the given dataset is mountable, false otherwise.  Returns the
 * mountpoint in 'buf'.
 */
static boolean_t
zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
    zprop_source_t *source)
{
	char sourceloc[ZFS_MAXNAMELEN];
	zprop_source_t sourcetype;

	if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
		return (B_FALSE);

	verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
	    &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);

	if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 ||
	    strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0)
		return (B_FALSE);

	if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF)
		return (B_FALSE);

	if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
	    getzoneid() == GLOBAL_ZONEID)
		return (B_FALSE);

    if (zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) ==
        ZFS_CRYPT_KEY_UNAVAILABLE)
        return (B_FALSE);

	if (source)
		*source = sourcetype;

	return (B_TRUE);
}

/*
 * This method builds values for "sharesmb" property from values
 * already existing on the share. The properties set via sa_zfs_sprint_new_prop
 * method are passed in sharesmb_val. If a existing property is already
 * set via sa_zfs_sprint_new_prop method, then they are not appended
 * to the sharesmb_val string. The returned sharesmb_val string is a combination
 * of new and existing values for 'sharesmb' property.
 */
static int
sa_zfs_sprintf_existing_prop(zfs_handle_t *handle, char *sharesmb_val)
{
	char shareopts[ZFS_MAXPROPLEN], cur_val[MAXPATHLEN];
	char *token, *last, *value;

	if (zfs_prop_get(handle, ZFS_PROP_SHARESMB, shareopts,
	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) != 0)
		return (-1);

	if (strstr(shareopts, "=") == NULL)
		return (0);

	for (token = strtok_r(shareopts, ",", &last); token != NULL;
	    token = strtok_r(NULL, ",", &last)) {
		value = strchr(token, '=');
		if (value == NULL)
			return (-1);
		*value++ = '\0';

		(void) snprintf(cur_val, MAXPATHLEN, "%s=", token);
		if (strstr(sharesmb_val, cur_val) == NULL) {
			(void) strlcat(cur_val, value, MAXPATHLEN);
			(void) strlcat(cur_val, ",", MAXPATHLEN);
			(void) strlcat(sharesmb_val, cur_val, MAXPATHLEN);
		}
	}

	return (0);
}

static int
mount_cb(zfs_handle_t *zhp, void *data)
{
	get_all_cb_t *cbp = data;

	if (!(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM)) {
		zfs_close(zhp);
		return (0);
	}

	if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
		zfs_close(zhp);
		return (0);
	}

	/*
	 * If this filesystem is inconsistent and has a receive resume
	 * token, we can not mount it.
	 */
	if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) &&
	    zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
	    NULL, 0, NULL, NULL, 0, B_TRUE) == 0) {
		zfs_close(zhp);
		return (0);
	}

	libzfs_add_handle(cbp, zhp);
	if (zfs_iter_filesystems(zhp, mount_cb, cbp) != 0) {
		zfs_close(zhp);
		return (-1);
	}
	return (0);
}

int
zfs_crypto_get_encryption_root(zfs_handle_t *zhp, boolean_t *is_encroot,
    char *buf)
{
	int ret;
	char prop_encroot[MAXNAMELEN];

	/* if the dataset isn't encrypted, just return */
	if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) == ZIO_CRYPT_OFF) {
		*is_encroot = B_FALSE;
		if (buf != NULL)
			buf[0] = '\0';
		return (0);
	}

	ret = zfs_prop_get(zhp, ZFS_PROP_ENCRYPTION_ROOT, prop_encroot,
	    sizeof (prop_encroot), NULL, NULL, 0, B_TRUE);
	if (ret != 0) {
		*is_encroot = B_FALSE;
		if (buf != NULL)
			buf[0] = '\0';
		return (ret);
	}

	*is_encroot = strcmp(prop_encroot, zfs_get_name(zhp)) == 0;
	if (buf != NULL)
		strcpy(buf, prop_encroot);

	return (0);
}

int
sa_zfs_is_shared(sa_handle_t sahandle, char *path)
{
	int ret = 0;
	char *dataset;
	zfs_handle_t *handle = NULL;
	char shareopts[ZFS_MAXPROPLEN];
	libzfs_handle_t *libhandle;

	dataset = get_zfs_dataset((sa_handle_t)sahandle, path, B_FALSE);
	if (dataset != NULL) {
		libhandle = libzfs_init();
		if (libhandle != NULL) {
			handle = zfs_open(libhandle, dataset,
			    ZFS_TYPE_FILESYSTEM);
			if (handle != NULL) {
				if (zfs_prop_get(handle, ZFS_PROP_SHARENFS,
				    shareopts, sizeof (shareopts), NULL, NULL,
				    0, B_FALSE) == 0 &&
				    strcmp(shareopts, "off") != 0) {
					ret = 1; /* it is shared */
				}
				zfs_close(handle);
			}
			libzfs_fini(libhandle);
		}
		free(dataset);
	}
	return (ret);
}

int
zfs_share_iscsi(zfs_handle_t *zhp)
{
	char shareopts[ZFS_MAXPROPLEN];
	const char *dataset = zhp->zfs_name;
	libzfs_handle_t *hdl = zhp->zfs_hdl;

	/*
	 * Return success if there are no share options.
	 */
	if (zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
	    sizeof (shareopts), NULL, NULL, 0, B_FALSE) != 0 ||
	    strcmp(shareopts, "off") == 0)
		return (0);

	if (iscsitgt_zfs_share == NULL || iscsitgt_zfs_share(dataset) != 0) {
		int error = EZFS_SHAREISCSIFAILED;

		/*
		 * If service isn't availabele and EPERM was
		 * returned then use special error.
		 */
		if (iscsitgt_svc_online && errno == EPERM &&
		    (iscsitgt_svc_online() != 0))
			error = EZFS_ISCSISVCUNAVAIL;

		return (zfs_error_fmt(hdl, error,
		    dgettext(TEXT_DOMAIN, "cannot share '%s'"), dataset));
	}

	return (0);
}

static char *
verify_zfs_handle(zfs_handle_t *hdl, const char *path, boolean_t search_mnttab)
{
	char mountpoint[ZFS_MAXPROPLEN];
	char canmount[ZFS_MAXPROPLEN] = { 0 };
	/* must have a mountpoint */
	if (zfs_prop_get(hdl, ZFS_PROP_MOUNTPOINT, mountpoint,
	    sizeof (mountpoint), NULL, NULL, 0, B_FALSE) != 0) {
		/* no mountpoint */
		return (NULL);
	}

	/* mountpoint must be a path */
	if (strcmp(mountpoint, ZFS_MOUNTPOINT_NONE) == 0 ||
	    strcmp(mountpoint, ZFS_MOUNTPOINT_LEGACY) == 0) {
		/*
		 * Search mmttab for mountpoint and get dataset.
		 */

		if (search_mnttab == B_TRUE &&
		    get_legacy_mountpoint(path, mountpoint,
		    sizeof (mountpoint), NULL, 0) == 0) {
			return (strdup(mountpoint));
		}
		return (NULL);
	}

	/* canmount must be set */
	if (zfs_prop_get(hdl, ZFS_PROP_CANMOUNT, canmount,
	    sizeof (canmount), NULL, NULL, 0, B_FALSE) != 0 ||
	    strcmp(canmount, "off") == 0)
		return (NULL);

	/*
	 * have a mountable handle but want to skip those marked none
	 * and legacy
	 */
	if (strcmp(mountpoint, path) == 0) {
		return (strdup((char *)zfs_get_name(hdl)));
	}

	return (NULL);
}

/*
 * Insert the backup snapshot name into the path.
 *
 * Input:
 * 	name: Original path name.
 *
 * Output:
 * 	name: Original name modified to include a snapshot.
 *
 * Returns:
 * 	Original name modified to include a snapshot.
 */
char *
tlm_build_snapshot_name(char *name, char *sname, char *jname)
{
    zfs_handle_t *zhp;
    char *rest;
    char volname[ZFS_MAXNAMELEN];
    char mountpoint[PATH_MAX];

    if (get_zfsvolname(volname, ZFS_MAXNAMELEN, name) == -1)
        goto notzfs;

    (void) mutex_lock(&zlib_mtx);
    if ((zlibh == NULL) ||
            (zhp = zfs_open(zlibh, volname, ZFS_TYPE_DATASET)) == NULL) {
        (void) mutex_unlock(&zlib_mtx);
        goto notzfs;
    }

    if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mountpoint, PATH_MAX, NULL,
                     NULL, 0, B_FALSE) != 0) {
        zfs_close(zhp);
        (void) mutex_unlock(&zlib_mtx);
        goto notzfs;
    }

    zfs_close(zhp);
    (void) mutex_unlock(&zlib_mtx);

    rest = name + strlen(mountpoint);
    (void) snprintf(sname, TLM_MAX_PATH_NAME, "%s/%s/%s%s", mountpoint,
                    TLM_SNAPSHOT_DIR, jname, rest);

    return (sname);

notzfs:
    (void) strlcpy(sname, name, TLM_MAX_PATH_NAME);
    return (sname);
}

/*
 * A ZFS file system iterator call-back function which returns the
 * zfs_handle_t for a ZFS file system on the specified mount point.
 */
static int
match_mountpoint(zfs_handle_t *zhp, void *data)
{
	int			res;
	zfs_mount_data_t	*cbp;
	char			mp[ZFS_MAXPROPLEN];

	if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
		zfs_close(zhp);
		return (0);
	}

	cbp = (zfs_mount_data_t *)data;
	if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mp, sizeof (mp), NULL, NULL,
	    0, B_FALSE) == 0 && strcmp(mp, cbp->match_name) == 0) {
		cbp->match_handle = zhp;
		return (1);
	}

	res = zfs_iter_filesystems(zhp, match_mountpoint, data);
	zfs_close(zhp);
	return (res);
}

/*
 * This method computes ACL on share path from a share name.
 * Return 0 upon success, -1 upon failure.
 */
static int
srvsvc_shareacl_getpath(smb_share_t *si, char *shr_acl_path)
{
	char dataset[MAXPATHLEN];
	char mp[ZFS_MAXPROPLEN];
	libzfs_handle_t *libhd;
	zfs_handle_t *zfshd;
	int ret = 0;

	ret = smb_getdataset(si->shr_path, dataset, MAXPATHLEN);
	if (ret != 0)
		return (ret);

	if ((libhd = libzfs_init()) == NULL)
		return (-1);

	if ((zfshd = zfs_open(libhd, dataset, ZFS_TYPE_DATASET)) == NULL) {
		libzfs_fini(libhd);
		return (-1);
	}

	if (zfs_prop_get(zfshd, ZFS_PROP_MOUNTPOINT, mp, sizeof (mp), NULL,
	    NULL, 0, B_FALSE) != 0) {
		zfs_close(zfshd);
		libzfs_fini(libhd);
		return (-1);
	}

	zfs_close(zfshd);
	libzfs_fini(libhd);

	(void) snprintf(shr_acl_path, MAXPATHLEN, "%s/.zfs/shares/%s",
	    mp, si->shr_name);

	return (ret);
}

static char *
get_zfs_property(char *dataset, zfs_prop_t property)
{
	zfs_handle_t *handle = NULL;
	char shareopts[ZFS_MAXPROPLEN];
	libzfs_handle_t *libhandle;

	libhandle = libzfs_init();
	if (libhandle != NULL) {
		handle = zfs_open(libhandle, dataset, ZFS_TYPE_FILESYSTEM);
		if (handle != NULL) {
			if (zfs_prop_get(handle, property, shareopts,
			    sizeof (shareopts), NULL, NULL, 0,
			    B_FALSE) == 0) {
				zfs_close(handle);
				libzfs_fini(libhandle);
				return (strdup(shareopts));
			}
			zfs_close(handle);
		}
		libzfs_fini(libhandle);
	}
	return (NULL);
}