/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * 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 AUTHORS 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 AUTHORS 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.
 */

#ifndef _G_CONCAT_H_
#define _G_CONCAT_H_

#include <sys/endian.h>

#define G_CONCAT_CLASS_NAME     "CONCAT"

#define G_CONCAT_MAGIC          "GEOM::CONCAT"
/*
 * Version history:
 * 1 - Initial version number.
 * 2 - Added 'stop' command to gconcat(8).
 * 3 - Added md_provider field to metadata and '-h' option to gconcat(8).
 * 4 - Added md_provsize field to metadata.
 */
#define G_CONCAT_VERSION        4

#ifdef _KERNEL
#define G_CONCAT_TYPE_MANUAL    0
#define G_CONCAT_TYPE_AUTOMATIC 1

#define G_CONCAT_DEBUG(lvl, ...) \
    _GEOM_DEBUG("GEOM_CONCAT", g_concat_debug, (lvl), NULL, __VA_ARGS__)
#define G_CONCAT_LOGREQ(bp, ...) \
    _GEOM_DEBUG("GEOM_CONCAT", g_concat_debug, 2, (bp), __VA_ARGS__)

struct g_concat_disk {
        TAILQ_ENTRY(g_concat_disk) d_next;
        struct g_consumer       *d_consumer;
        struct g_concat_softc   *d_softc;
        off_t                    d_start;
        off_t                    d_end;
        int                      d_candelete;
        int                      d_removed;
        bool                     d_hardcoded;
};

struct g_concat_softc {
        u_int            sc_type;       /* provider type */
        struct g_geom   *sc_geom;
        struct g_provider *sc_provider;
        uint32_t         sc_id;         /* concat unique ID */

        uint16_t         sc_ndisks;
        TAILQ_HEAD(g_concat_disks, g_concat_disk) sc_disks;

        struct mtx       sc_completion_lock; /* synchronizes cross-boundary IOs */
        struct sx        sc_disks_lock; /* synchronizes modification of sc_disks */
};
#define sc_name sc_geom->name
#endif  /* _KERNEL */

struct g_concat_metadata {
        char            md_magic[16];   /* Magic value. */
        uint32_t        md_version;     /* Version number. */
        char            md_name[16];    /* Concat name. */
        uint32_t        md_id;          /* Unique ID. */
        uint16_t        md_no;          /* Disk number. */
        uint16_t        md_all;         /* Number of all disks. */
        char            md_provider[16]; /* Hardcoded provider. */
        uint64_t        md_provsize;    /* Provider's size. */
};
static __inline void
concat_metadata_encode(const struct g_concat_metadata *md, u_char *data)
{

        bcopy(md->md_magic, data, sizeof(md->md_magic));
        le32enc(data + 16, md->md_version);
        bcopy(md->md_name, data + 20, sizeof(md->md_name));
        le32enc(data + 36, md->md_id);
        le16enc(data + 40, md->md_no);
        le16enc(data + 42, md->md_all);
        bcopy(md->md_provider, data + 44, sizeof(md->md_provider));
        le64enc(data + 60, md->md_provsize);
}
static __inline void
concat_metadata_decode(const u_char *data, struct g_concat_metadata *md)
{

        bcopy(data, md->md_magic, sizeof(md->md_magic));
        md->md_version = le32dec(data + 16);
        bcopy(data + 20, md->md_name, sizeof(md->md_name));
        md->md_id = le32dec(data + 36);
        md->md_no = le16dec(data + 40);
        md->md_all = le16dec(data + 42);
        bcopy(data + 44, md->md_provider, sizeof(md->md_provider));
        md->md_provsize = le64dec(data + 60);
}
#endif  /* _G_CONCAT_H_ */