2 * Copyright 2020 Toomas Soome <tsoome@me.com>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * Big Theory Statement.
29 * nvstore is abstraction layer to implement data read/write to different
30 * types of non-volatile storage.
33 * Provide mapping via environment: setenv/unsetenv/putenv. Access via
34 * environment functions/commands is available once nvstore has
35 * attached the backend and stored textual data is mapped to environment.
37 * nvstore_init(): attach new backend and create the environment mapping.
38 * nvstore_fini: detach backend and unmap the related environment.
40 * The disk based storage, such as UFS file or ZFS bootenv label area, is
41 * only accessible after root file system is set. Root file system change
42 * will switch the back end storage.
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
49 #include <sys/queue.h>
53 nvstore_list_t stores = STAILQ_HEAD_INITIALIZER(stores);
56 nvstore_get_store(const char *name)
62 STAILQ_FOREACH(st, &stores, nvs_next) {
63 if (strcmp(name, st->nvs_name) == 0)
71 nvstore_init(const char *name, nvs_callbacks_t *cb, void *data)
75 st = nvstore_get_store(name);
79 if ((st = malloc(sizeof (*st))) == NULL)
82 if ((st->nvs_name = strdup(name)) == NULL) {
90 STAILQ_INSERT_TAIL(&stores, st, nvs_next);
95 nvstore_fini(const char *name)
99 st = nvstore_get_store(name);
103 STAILQ_REMOVE(&stores, st, nvstore, nvs_next);
112 nvstore_print(void *ptr)
116 return (st->nvs_cb->nvs_iterate(st->nvs_data, st->nvs_cb->nvs_print));
120 nvstore_get_var(void *ptr, const char *name, void **data)
124 return (st->nvs_cb->nvs_getter(st->nvs_data, name, data));
128 nvstore_set_var(void *ptr, int type, const char *name,
129 void *data, size_t size)
133 return (st->nvs_cb->nvs_setter(st->nvs_data, type, name, data, size));
137 nvstore_set_var_from_string(void *ptr, const char *type, const char *name,
142 return (st->nvs_cb->nvs_setter_str(st->nvs_data, type, name, data));
146 nvstore_unset_var(void *ptr, const char *name)
150 return (st->nvs_cb->nvs_unset(st->nvs_data, name));