source: mainline/uspace/srv/bd/hr/metadata/foreign/geom/stripe.c@ 5cb1631

/*
 * Copyright (c) 2025 Miroslav Cimerman
 * 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 hr
 * @{
 */
/**
 * @file
 */

#include <adt/list.h>
#include <block.h>
#include <byteorder.h>
#include <errno.h>
#include <inttypes.h>
#include <io/log.h>
#include <loc.h>
#include <mem.h>
#include <uuid.h>
#include <stdlib.h>
#include <stdio.h>
#include <str.h>
#include <types/uuid.h>

#include "../../../util.h"
#include "../../../var.h"

#include "g_stripe.h"

static void             *meta_stripe_alloc_struct(void);
static errno_t           meta_stripe_init_vol2meta(const hr_volume_t *, void *);
static errno_t           meta_stripe_init_meta2vol(const list_t *,
    hr_volume_t *);
static void              meta_stripe_encode(void *, void *);
static errno_t           meta_stripe_decode(const void *, void *);
static errno_t           meta_stripe_get_block(service_id_t, void **);
static errno_t           meta_stripe_write_block(service_id_t, const void *);
static bool              meta_stripe_has_valid_magic(const void *);
static bool              meta_stripe_compare_uuids(const void *, const void *);
static void              meta_stripe_inc_counter(void *);
static errno_t           meta_stripe_save(hr_volume_t *, bool);
static const char       *meta_stripe_get_devname(const void *);
static hr_level_t        meta_stripe_get_level(const void *);
static uint64_t          meta_stripe_get_data_offset(void);
static size_t            meta_stripe_get_size(void);
static uint8_t           meta_stripe_get_flags(void);
static hr_metadata_type_t        meta_stripe_get_type(void);
static void              meta_stripe_dump(const void *);

hr_superblock_ops_t metadata_stripe_ops = {
        .alloc_struct           = meta_stripe_alloc_struct,
        .init_vol2meta          = meta_stripe_init_vol2meta,
        .init_meta2vol          = meta_stripe_init_meta2vol,
        .encode                 = meta_stripe_encode,
        .decode                 = meta_stripe_decode,
        .get_block              = meta_stripe_get_block,
        .write_block            = meta_stripe_write_block,
        .has_valid_magic        = meta_stripe_has_valid_magic,
        .compare_uuids          = meta_stripe_compare_uuids,
        .inc_counter            = meta_stripe_inc_counter,
        .save                   = meta_stripe_save,
        .get_devname            = meta_stripe_get_devname,
        .get_level              = meta_stripe_get_level,
        .get_data_offset        = meta_stripe_get_data_offset,
        .get_size               = meta_stripe_get_size,
        .get_flags              = meta_stripe_get_flags,
        .get_type               = meta_stripe_get_type,
        .dump                   = meta_stripe_dump
};

static void *meta_stripe_alloc_struct(void)
{
        return calloc(1, sizeof(struct g_stripe_metadata));
}

static errno_t meta_stripe_init_vol2meta(const hr_volume_t *vol, void *md_v)
{
        (void)vol;
        (void)md_v;
        return ENOTSUP;
}

static errno_t meta_stripe_init_meta2vol(const list_t *list, hr_volume_t *vol)
{
        HR_DEBUG("%s()", __func__);

        errno_t rc = EOK;

        /* get bsize */
        size_t bsize;
        struct dev_list_member *memb = list_get_instance(list_first(list),
            struct dev_list_member, link);
        rc = block_get_bsize(memb->svc_id, &bsize);
        if (rc != EOK)
                goto error;

        vol->bsize = bsize;

        uint64_t smallest_provider_size = ~0ULL;
        struct g_stripe_metadata *main_meta = NULL;

        list_foreach(*list, link, struct dev_list_member, iter) {
                struct g_stripe_metadata *iter_meta = iter->md;

                meta_stripe_dump(iter_meta);

                if (iter_meta->md_provsize < smallest_provider_size) {
                        smallest_provider_size = iter_meta->md_provsize;
                        main_meta = iter_meta;
                }
        }

        assert(main_meta != NULL);

        vol->truncated_blkno =
            main_meta->md_provsize / bsize;

        vol->extent_no = main_meta->md_all;

        vol->data_blkno = (vol->truncated_blkno - 1) * vol->extent_no;

        vol->data_offset = 0;

        if (main_meta->md_all > HR_MAX_EXTENTS) {
                HR_DEBUG("Assembled volume has %u extents (max = %u)",
                    (unsigned)main_meta->md_all, HR_MAX_EXTENTS);
                rc = EINVAL;
                goto error;
        }

        vol->strip_size = main_meta->md_stripesize;

        memcpy(vol->in_mem_md, main_meta, sizeof(struct g_stripe_metadata));

        list_foreach(*list, link, struct dev_list_member, iter) {
                struct g_stripe_metadata *iter_meta = iter->md;
                uint16_t index = iter_meta->md_no;

                vol->extents[index].svc_id = iter->svc_id;
                iter->fini = false;

                vol->extents[index].status = HR_EXT_ONLINE;
        }

        for (size_t i = 0; i < vol->extent_no; i++) {
                if (vol->extents[i].status == HR_EXT_NONE)
                        vol->extents[i].status = HR_EXT_MISSING;
        }

error:
        return rc;
}

static void meta_stripe_encode(void *md_v, void *block)
{
        HR_DEBUG("%s()", __func__);

        stripe_metadata_encode(md_v, block);
}

static errno_t meta_stripe_decode(const void *block, void *md_v)
{
        HR_DEBUG("%s()", __func__);

        stripe_metadata_decode(block, md_v);

        return EOK;
}

static errno_t meta_stripe_get_block(service_id_t dev, void **rblock)
{
        HR_DEBUG("%s()", __func__);

        errno_t rc;
        uint64_t blkno;
        size_t bsize;
        void *block;

        if (rblock == NULL)
                return EINVAL;

        rc = block_get_bsize(dev, &bsize);
        if (rc != EOK)
                return rc;

        if (bsize < sizeof(struct g_stripe_metadata))
                return EINVAL;

        rc = block_get_nblocks(dev, &blkno);
        if (rc != EOK)
                return rc;

        if (blkno < 1)
                return EINVAL;

        block = malloc(bsize);
        if (block == NULL)
                return ENOMEM;

        rc = block_read_direct(dev, blkno - 1, 1, block);
        /*
         * XXX: here maybe call vol status event or the state callback...
         *
         * but need to pass vol pointer
         */
        if (rc != EOK) {
                free(block);
                return rc;
        }

        *rblock = block;
        return EOK;
}

static errno_t meta_stripe_write_block(service_id_t dev, const void *block)
{
        HR_DEBUG("%s()", __func__);

        errno_t rc;
        uint64_t blkno;
        size_t bsize;

        rc = block_get_bsize(dev, &bsize);
        if (rc != EOK)
                return rc;

        if (bsize < sizeof(struct g_stripe_metadata))
                return EINVAL;

        rc = block_get_nblocks(dev, &blkno);
        if (rc != EOK)
                return rc;

        if (blkno < 1)
                return EINVAL;

        rc = block_write_direct(dev, blkno - 1, 1, block);

        return rc;
}

static bool meta_stripe_has_valid_magic(const void *md_v)
{
        HR_DEBUG("%s()", __func__);

        const struct g_stripe_metadata *md = md_v;

        if (str_lcmp(md->md_magic, G_STRIPE_MAGIC, 16) != 0)
                return false;

        return true;
}

static bool meta_stripe_compare_uuids(const void *md1_v, const void *md2_v)
{
        const struct g_stripe_metadata *md1 = md1_v;
        const struct g_stripe_metadata *md2 = md2_v;
        if (md1->md_id == md2->md_id)
                return true;

        return false;
}

static void meta_stripe_inc_counter(void *md_v)
{
        (void)md_v;
}

static errno_t meta_stripe_save(hr_volume_t *vol, bool with_state_callback)
{
        HR_DEBUG("%s()", __func__);

        return EOK;
}

static const char *meta_stripe_get_devname(const void *md_v)
{
        const struct g_stripe_metadata *md = md_v;

        return md->md_name;
}

static hr_level_t meta_stripe_get_level(const void *md_v)
{
        (void)md_v;

        return HR_LVL_0;
}

static uint64_t meta_stripe_get_data_offset(void)
{
        return 0;
}

static size_t meta_stripe_get_size(void)
{
        return 1;
}

static uint8_t meta_stripe_get_flags(void)
{
        uint8_t flags = 0;

        return flags;
}

static hr_metadata_type_t meta_stripe_get_type(void)
{
        return  HR_METADATA_GEOM_STRIPE;
}

static void meta_stripe_dump(const void *md_v)
{
        HR_DEBUG("%s()", __func__);

        const struct g_stripe_metadata *md = md_v;

        printf("     magic: %s\n", md->md_magic);
        printf("   version: %u\n", (u_int)md->md_version);
        printf("      name: %s\n", md->md_name);
        printf("        id: %u\n", (u_int)md->md_id);
        printf("        no: %u\n", (u_int)md->md_no);
        printf("       all: %u\n", (u_int)md->md_all);
        printf("stripesize: %u\n", (u_int)md->md_stripesize);
        printf(" mediasize: %jd\n", (intmax_t)md->md_provsize);
}

/** @}
 */