source: mainline/uspace/lib/label/src/dummy.c@ 241ab7e

/*
 * Copyright (c) 2015 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup liblabel
 * @{
 */
/**
 * @file Dummy label (for disks that have no recognized label)
 */

#include <errno.h>
#include <mem.h>
#include <stdlib.h>

#include "dummy.h"

static errno_t dummy_open(label_bd_t *, label_t **);
static errno_t dummy_create(label_bd_t *, label_t **);
static void dummy_close(label_t *);
static errno_t dummy_destroy(label_t *);
static errno_t dummy_get_info(label_t *, label_info_t *);
static label_part_t *dummy_part_first(label_t *);
static label_part_t *dummy_part_next(label_part_t *);
static void dummy_part_get_info(label_part_t *, label_part_info_t *);
static errno_t dummy_part_create(label_t *, label_part_spec_t *, label_part_t **);
static errno_t dummy_part_destroy(label_part_t *);
static errno_t dummy_suggest_ptype(label_t *, label_pcnt_t, label_ptype_t *);

label_ops_t dummy_label_ops = {
        .open = dummy_open,
        .create = dummy_create,
        .close = dummy_close,
        .destroy = dummy_destroy,
        .get_info = dummy_get_info,
        .part_first = dummy_part_first,
        .part_next = dummy_part_next,
        .part_get_info = dummy_part_get_info,
        .part_create = dummy_part_create,
        .part_destroy = dummy_part_destroy,
        .suggest_ptype = dummy_suggest_ptype
};

static errno_t dummy_open(label_bd_t *bd, label_t **rlabel)
{
        label_t *label = NULL;
        label_part_t *part = NULL;
        size_t bsize;
        aoff64_t nblocks;
        uint64_t ba_min, ba_max;
        errno_t rc;

        rc = bd->ops->get_bsize(bd->arg, &bsize);
        if (rc != EOK) {
                rc = EIO;
                goto error;
        }

        rc = bd->ops->get_nblocks(bd->arg, &nblocks);
        if (rc != EOK) {
                rc = EIO;
                goto error;
        }

        label = calloc(1, sizeof(label_t));
        if (label == NULL)
                return ENOMEM;

        list_initialize(&label->parts);
        list_initialize(&label->pri_parts);
        list_initialize(&label->log_parts);

        ba_min = 0;
        ba_max = nblocks;

        label->ops = &dummy_label_ops;
        label->ltype = lt_none;
        label->bd = *bd;
        label->ablock0 = ba_min;
        label->anblocks = ba_max - ba_min + 1;
        label->pri_entries = 0;
        label->block_size = bsize;

        part = calloc(1, sizeof(label_part_t));
        if (part == NULL)
                return ENOMEM;

        part->index = 0;
        part->block0 = ba_min;
        part->nblocks = ba_max - ba_min;
        part->ptype.fmt = lptf_num;

        part->label = label;
        list_append(&part->lparts, &label->parts);
        list_append(&part->lpri, &label->pri_parts);

        *rlabel = label;
        return EOK;
error:
        free(part);
        free(label);
        return rc;
}

static errno_t dummy_create(label_bd_t *bd, label_t **rlabel)
{
        return ENOTSUP;
}

static void dummy_close(label_t *label)
{
        label_part_t *part;

        part = dummy_part_first(label);
        while (part != NULL) {
                list_remove(&part->lparts);
                list_remove(&part->lpri);
                free(part);
                part = dummy_part_first(label);
        }

        free(label);
}

static errno_t dummy_destroy(label_t *label)
{
        return ENOTSUP;
}

static errno_t dummy_get_info(label_t *label, label_info_t *linfo)
{
        memset(linfo, 0, sizeof(label_info_t));
        linfo->ltype = lt_none;
        linfo->flags = 0;
        linfo->ablock0 = label->ablock0;
        linfo->anblocks = label->anblocks;
        return EOK;
}

static label_part_t *dummy_part_first(label_t *label)
{
        link_t *link;

        link = list_first(&label->parts);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, label_part_t, lparts);
}

static label_part_t *dummy_part_next(label_part_t *part)
{
        link_t *link;

        link = list_next(&part->lparts, &part->label->parts);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, label_part_t, lparts);
}

static void dummy_part_get_info(label_part_t *part, label_part_info_t *pinfo)
{
        pinfo->index = part->index;
        pinfo->pkind = lpk_primary;
        pinfo->block0 = part->block0;
        pinfo->nblocks = part->nblocks;
}

static errno_t dummy_part_create(label_t *label, label_part_spec_t *pspec,
    label_part_t **rpart)
{
        return ENOTSUP;
}

static errno_t dummy_part_destroy(label_part_t *part)
{
        return ENOTSUP;
}

static errno_t dummy_suggest_ptype(label_t *label, label_pcnt_t pcnt,
    label_ptype_t *ptype)
{
        return ENOTSUP;
}

/** @}
 */