mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-30 04:22:44 +00:00
149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*-
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Big Theory Statement.
|
|
*
|
|
* nvstore is abstraction layer to implement data read/write to different
|
|
* types of non-volatile storage.
|
|
*
|
|
* User interfaces:
|
|
* Provide mapping via environment: setenv/unsetenv/putenv. Access via
|
|
* environment functions/commands is available once nvstore has
|
|
* attached the backend and stored textual data is mapped to environment.
|
|
*
|
|
* nvstore_init(): attach new backend and create the environment mapping.
|
|
* nvstore_fini: detach backend and unmap the related environment.
|
|
*
|
|
* The disk based storage, such as UFS file or ZFS bootenv label area, is
|
|
* only accessible after root file system is set. Root file system change
|
|
* will switch the back end storage.
|
|
*/
|
|
|
|
#include <stdbool.h>
|
|
#include <sys/queue.h>
|
|
#include "stand.h"
|
|
#include "nvstore.h"
|
|
|
|
nvstore_list_t stores = STAILQ_HEAD_INITIALIZER(stores);
|
|
|
|
void *
|
|
nvstore_get_store(const char *name)
|
|
{
|
|
nvstore_t *st;
|
|
|
|
st = NULL;
|
|
|
|
STAILQ_FOREACH(st, &stores, nvs_next) {
|
|
if (strcmp(name, st->nvs_name) == 0)
|
|
break;
|
|
}
|
|
|
|
return (st);
|
|
}
|
|
|
|
int
|
|
nvstore_init(const char *name, nvs_callbacks_t *cb, void *data)
|
|
{
|
|
nvstore_t *st;
|
|
|
|
st = nvstore_get_store(name);
|
|
if (st != NULL)
|
|
return (EEXIST);
|
|
|
|
if ((st = malloc(sizeof (*st))) == NULL)
|
|
return (ENOMEM);
|
|
|
|
if ((st->nvs_name = strdup(name)) == NULL) {
|
|
free(st);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
st->nvs_data = data;
|
|
st->nvs_cb = cb;
|
|
|
|
STAILQ_INSERT_TAIL(&stores, st, nvs_next);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nvstore_fini(const char *name)
|
|
{
|
|
nvstore_t *st;
|
|
|
|
st = nvstore_get_store(name);
|
|
if (st == NULL)
|
|
return (ENOENT);
|
|
|
|
STAILQ_REMOVE(&stores, st, nvstore, nvs_next);
|
|
|
|
free(st->nvs_name);
|
|
free(st->nvs_data);
|
|
free(st);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
nvstore_print(void *ptr)
|
|
{
|
|
nvstore_t *st = ptr;
|
|
|
|
return (st->nvs_cb->nvs_iterate(st->nvs_data, st->nvs_cb->nvs_print));
|
|
}
|
|
|
|
int
|
|
nvstore_get_var(void *ptr, const char *name, void **data)
|
|
{
|
|
nvstore_t *st = ptr;
|
|
|
|
return (st->nvs_cb->nvs_getter(st->nvs_data, name, data));
|
|
}
|
|
|
|
int
|
|
nvstore_set_var(void *ptr, int type, const char *name,
|
|
void *data, size_t size)
|
|
{
|
|
nvstore_t *st = ptr;
|
|
|
|
return (st->nvs_cb->nvs_setter(st->nvs_data, type, name, data, size));
|
|
}
|
|
|
|
int
|
|
nvstore_set_var_from_string(void *ptr, const char *type, const char *name,
|
|
const char *data)
|
|
{
|
|
nvstore_t *st = ptr;
|
|
|
|
return (st->nvs_cb->nvs_setter_str(st->nvs_data, type, name, data));
|
|
}
|
|
|
|
int
|
|
nvstore_unset_var(void *ptr, const char *name)
|
|
{
|
|
nvstore_t *st = ptr;
|
|
|
|
return (st->nvs_cb->nvs_unset(st->nvs_data, name));
|
|
}
|