Differential D25512 Diff 74499 lib/libzfsbootenv/lzbe_device.c

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lib/libzfsbootenv/lzbe_device.c

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				/*-
				* Copyright 2020 Toomas Soome <tsoome@me.com>
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/types.h>
				#include <string.h>
				#include <libzfs.h>
				#include <libzfsbootenv.h>

				/*
				* Store device name to zpool label bootenv area.
				*/
				int
				lzbe_set_boot_device(const char pool, const char device)
				{
				libzfs_handle_t *hdl;
				zpool_handle_t *zphdl;
				nvlist_t *nv;
				char *descriptor;
				int rv = -1;

				if (pool == NULL \|\| *pool == '\0')
				return (rv);

				if ((hdl = libzfs_init()) == NULL) {
				return (rv);
				}

				zphdl = zpool_open(hdl, pool);
				if (zphdl == NULL) {
				libzfs_fini(hdl);
				return (rv);
				}

				rv = zpool_get_bootenv(zphdl, &nv);
				if (rv != 0)
				nv = fnvlist_alloc();

				/*
				* If device name is empty, remove boot device configuration.
				*/
				if ((device == NULL \|\| *device == '\0') &&
				nvlist_exists(nv, "command")) {
				fnvlist_remove(nv, "command");
				} else {
				/*
				* Use device name directly if it does start with
				* prefix "zfs:". Otherwise, add prefix and sufix.
				*/
				if (strncmp(device, "zfs:", 4) == 0) {
				fnvlist_add_string(nv, "command", device);
				} else {
				descriptor = NULL;
				if (asprintf(&descriptor, "zfs:%s:", device) > 0)
				fnvlist_add_string(nv, "command", descriptor);
				else
				rv = ENOMEM;
				free(descriptor);
				}
				}

				rv = zpool_set_bootenv(zphdl, nv);
				fnvlist_free(nv);
				zpool_close(zphdl);
				libzfs_fini(hdl);
				return (rv);
				}

				/*
				* Return boot device name from bootenv, if set.
				*/
				glebiusUnsubmitted Done Inline Actions Typo: fro. glebius: Typo: fro.
				int
				lzbe_get_boot_device(const char pool, char *device)
				{
				libzfs_handle_t *hdl;
				zpool_handle_t *zphdl;
				nvlist_t *nv;
				char *val;
				int rv = -1;

				if (pool == NULL \|\| *pool == '\0' \|\| device == NULL)
				return (rv);

				if ((hdl = libzfs_init()) == NULL) {
				return (rv);
				}

				zphdl = zpool_open(hdl, pool);
				if (zphdl == NULL) {
				libzfs_fini(hdl);
				return (rv);
				}

				rv = zpool_get_bootenv(zphdl, &nv);
				if (rv == 0) {
				rv = nvlist_lookup_string(nv, "command", &val);
				if (rv == 0) {
				/*
				* zfs device descriptor is in form of "zfs:dataset:",
				* we only do need dataset name.
				*/
				if (strncmp(val, "zfs:", 4) == 0)
				val += 4;
				val = strdup(val);
				if (val != NULL) {
				size_t len = strlen(val);

				if (val[len - 1] == ':')
				val[len - 1] = '\0';
				*device = val;
				} else {
				rv = ENOMEM;
				}
				}
				}

				nvlist_free(nv);
				zpool_close(zphdl);
				libzfs_fini(hdl);
				return (rv);
				}