d1ea501714
zfs lives in libsa. However, it depends on nvstore (and other things) that are in common. Fix part of this layering violation by splitting nvstore into a libsa piece (which is the base implementation) and keeping a much smaller common piece (to implement the nvstore command). This just leaves zfs' knowledge of device names that's specific to common and its calling platform specific init code to resolve. Add a nvstore.h file for these two parts to communicate private things and move the public nvstore api from bootstrap.h to stand.h. Sponsored by: Netflix Reviewed by: tsoome, kevans Differential Revision: https://reviews.freebsd.org/D38043
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*-
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* Copyright 2020 Toomas Soome <tsoome@me.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Big Theory Statement.
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*
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* nvstore is abstraction layer to implement data read/write to different
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* types of non-volatile storage.
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*
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* User interfaces:
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* Provide mapping via environment: setenv/unsetenv/putenv. Access via
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* environment functions/commands is available once nvstore has
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* attached the backend and stored textual data is mapped to environment.
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*
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* nvstore_init(): attach new backend and create the environment mapping.
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* nvstore_fini: detach backend and unmap the related environment.
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*
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* The disk based storage, such as UFS file or ZFS bootenv label area, is
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* only accessible after root file system is set. Root file system change
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* will switch the back end storage.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdbool.h>
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#include <sys/queue.h>
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#include "stand.h"
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#include "nvstore.h"
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nvstore_list_t stores = STAILQ_HEAD_INITIALIZER(stores);
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void *
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nvstore_get_store(const char *name)
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{
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nvstore_t *st;
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st = NULL;
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STAILQ_FOREACH(st, &stores, nvs_next) {
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if (strcmp(name, st->nvs_name) == 0)
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break;
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}
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return (st);
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}
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int
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nvstore_init(const char *name, nvs_callbacks_t *cb, void *data)
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{
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nvstore_t *st;
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st = nvstore_get_store(name);
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if (st != NULL)
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return (EEXIST);
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if ((st = malloc(sizeof (*st))) == NULL)
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return (ENOMEM);
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if ((st->nvs_name = strdup(name)) == NULL) {
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free(st);
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return (ENOMEM);
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}
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st->nvs_data = data;
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st->nvs_cb = cb;
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STAILQ_INSERT_TAIL(&stores, st, nvs_next);
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return (0);
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}
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int
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nvstore_fini(const char *name)
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{
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nvstore_t *st;
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st = nvstore_get_store(name);
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if (st == NULL)
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return (ENOENT);
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STAILQ_REMOVE(&stores, st, nvstore, nvs_next);
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free(st->nvs_name);
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free(st->nvs_data);
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free(st);
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return (0);
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}
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int
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nvstore_print(void *ptr)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_iterate(st->nvs_data, st->nvs_cb->nvs_print));
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}
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int
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nvstore_get_var(void *ptr, const char *name, void **data)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_getter(st->nvs_data, name, data));
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}
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int
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nvstore_set_var(void *ptr, int type, const char *name,
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void *data, size_t size)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_setter(st->nvs_data, type, name, data, size));
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}
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int
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nvstore_set_var_from_string(void *ptr, const char *type, const char *name,
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const char *data)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_setter_str(st->nvs_data, type, name, data));
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}
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int
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nvstore_unset_var(void *ptr, const char *name)
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{
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nvstore_t *st = ptr;
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return (st->nvs_cb->nvs_unset(st->nvs_data, name));
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}
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