165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/*
|
|
* This file and its contents are supplied under the terms of the
|
|
* Common Development and Distribution License ("CDDL"), version 1.0.
|
|
* You may only use this file in accordance with the terms of version
|
|
* 1.0 of the CDDL.
|
|
*
|
|
* A full copy of the text of the CDDL should have accompanied this
|
|
* source. A copy of the CDDL is also available via the Internet at
|
|
* http://www.illumos.org/license/CDDL.
|
|
*/
|
|
/*
|
|
* Copyright 2020 Toomas Soome <tsoome@me.com>
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
#include <libzfs.h>
|
|
#include <libzfsbootenv.h>
|
|
#include <sys/zfs_bootenv.h>
|
|
#include <sys/vdev_impl.h>
|
|
|
|
/*
|
|
* Store device name to zpool label bootenv area.
|
|
* This call will set bootenv version to VB_NVLIST, if bootenv currently
|
|
* does contain other version, then old data will be replaced.
|
|
*/
|
|
int
|
|
lzbe_set_boot_device(const char *pool, lzbe_flags_t flag, const char *device)
|
|
{
|
|
libzfs_handle_t *hdl;
|
|
zpool_handle_t *zphdl;
|
|
nvlist_t *nv;
|
|
char *descriptor;
|
|
uint64_t version;
|
|
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);
|
|
}
|
|
|
|
switch (flag) {
|
|
case lzbe_add:
|
|
rv = zpool_get_bootenv(zphdl, &nv);
|
|
if (rv == 0) {
|
|
/*
|
|
* We got the nvlist, check for version.
|
|
* if version is missing or is not VB_NVLIST,
|
|
* create new list.
|
|
*/
|
|
rv = nvlist_lookup_uint64(nv, BOOTENV_VERSION,
|
|
&version);
|
|
if (rv == 0 && version == VB_NVLIST)
|
|
break;
|
|
|
|
/* Drop this nvlist */
|
|
fnvlist_free(nv);
|
|
}
|
|
zfs_fallthrough;
|
|
case lzbe_replace:
|
|
nv = fnvlist_alloc();
|
|
break;
|
|
default:
|
|
return (rv);
|
|
}
|
|
|
|
/* version is mandatory */
|
|
fnvlist_add_uint64(nv, BOOTENV_VERSION, VB_NVLIST);
|
|
|
|
rv = 0;
|
|
/*
|
|
* If device name is empty, remove boot device configuration.
|
|
*/
|
|
if ((device == NULL || *device == '\0')) {
|
|
if (nvlist_exists(nv, OS_BOOTONCE))
|
|
fnvlist_remove(nv, OS_BOOTONCE);
|
|
} else {
|
|
/*
|
|
* Use device name directly if it does start with
|
|
* prefix "zfs:". Otherwise, add prefix and suffix.
|
|
*/
|
|
if (strncmp(device, "zfs:", 4) == 0) {
|
|
fnvlist_add_string(nv, OS_BOOTONCE, device);
|
|
} else {
|
|
if (asprintf(&descriptor, "zfs:%s:", device) > 0) {
|
|
fnvlist_add_string(nv, OS_BOOTONCE, descriptor);
|
|
free(descriptor);
|
|
} else
|
|
rv = ENOMEM;
|
|
}
|
|
}
|
|
if (rv == 0)
|
|
rv = zpool_set_bootenv(zphdl, nv);
|
|
if (rv != 0)
|
|
fprintf(stderr, "%s\n", libzfs_error_description(hdl));
|
|
|
|
fnvlist_free(nv);
|
|
zpool_close(zphdl);
|
|
libzfs_fini(hdl);
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* Return boot device name from bootenv, if set.
|
|
*/
|
|
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, OS_BOOTONCE, &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;
|
|
}
|
|
} else {
|
|
rv = EINVAL;
|
|
}
|
|
}
|
|
nvlist_free(nv);
|
|
}
|
|
|
|
zpool_close(zphdl);
|
|
libzfs_fini(hdl);
|
|
return (rv);
|
|
}
|