/*      $NetBSD: partutil.c,v 1.19 2025/04/13 14:00:59 jakllsch Exp $   */

/*-
 * Copyright (c) 2006 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: partutil.c,v 1.19 2025/04/13 14:00:59 jakllsch Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/stat.h>


#include <disktab.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <util.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#include <prop/proplib.h>

#include "partutil.h"

/*
 * Convert disklabel geometry info to disk_geom.
 */
static void
label2geom(struct disk_geom *geo, const struct disklabel *lp)
{
        geo->dg_secperunit = lp->d_secperunit;
        geo->dg_secsize = lp->d_secsize;
        geo->dg_nsectors = lp->d_nsectors;
        geo->dg_ntracks = lp->d_ntracks;
        geo->dg_ncylinders = lp->d_ncylinders;
        geo->dg_secpercyl = lp->d_secpercyl;
        geo->dg_pcylinders = lp->d_ncylinders;
        geo->dg_sparespertrack = lp->d_sparespertrack;
        geo->dg_sparespercyl = lp->d_sparespercyl;
        geo->dg_acylinders = lp->d_acylinders;
}

/*
 * Set what we need to know about disk geometry.
 */
static void
dict2geom(struct disk_geom *geo, prop_dictionary_t dict)
{
        (void)memset(geo, 0, sizeof(struct disk_geom));
        prop_dictionary_get_int64(dict, "sectors-per-unit",
            &geo->dg_secperunit);
        prop_dictionary_get_uint32(dict, "sector-size", &geo->dg_secsize);
        prop_dictionary_get_uint32(dict, "sectors-per-track",
            &geo->dg_nsectors);
        prop_dictionary_get_uint32(dict, "tracks-per-cylinder",
            &geo->dg_ntracks);
        prop_dictionary_get_uint32(dict, "cylinders-per-unit",
            &geo->dg_ncylinders);
        geo->dg_physsecsize = geo->dg_secsize;
        prop_dictionary_get_uint32(dict, "physical-sector-size",
            &geo->dg_physsecsize);
        prop_dictionary_get_uint32(dict, "aligned-sector",
            &geo->dg_alignedsec);
}


int
getdiskinfo(const char *s, int fd, const char *dt, struct disk_geom *geo,
    struct dkwedge_info *dkw)
{
        struct disklabel lab;
        struct disklabel *lp = &lab;
        prop_dictionary_t disk_dict, geom_dict;
        struct stat sb;
        const struct partition *pp;
        int ptn, error;

        if (dt) {
                lp = getdiskbyname(dt);
                if (lp == NULL)
                        errx(1, "unknown disk type `%s'", dt);
        }

        /* Get disk description dictionary */
        disk_dict = NULL;
        error = prop_dictionary_recv_ioctl(fd, DIOCGDISKINFO, &disk_dict);

        /* fail quickly if the device does not exist at all */
        if (error == ENXIO)
                return -1;

        if (error) {
                /*
                 * Ask for disklabel if DIOCGDISKINFO failed. This is
                 * compatibility call and can be removed when all devices
                 * will support DIOCGDISKINFO.
                 * cgd, ccd pseudo disk drives doesn't support DIOCGDDISKINFO
                 */
                if (ioctl(fd, DIOCGDINFO, lp) == -1) {
                        if (errno != ENXIO)
                                warn("DIOCGDINFO on %s failed", s);
                        return -1;
                }
                label2geom(geo, lp);
        } else {
                geom_dict = prop_dictionary_get(disk_dict, "geometry");
                dict2geom(geo, geom_dict);
        }
        if (disk_dict != NULL)
                prop_object_release(disk_dict);

        if (dkw == NULL)
                return 0;

        /* Get info about partition/wedge */
        if (ioctl(fd, DIOCGWEDGEINFO, dkw) != -1) {
                /* DIOCGWEDGEINFO didn't fail, we're done */
                return 0;
        }

        if (ioctl(fd, DIOCGDINFO, lp) == -1) {
                err(1, "Please implement DIOCGWEDGEINFO or "
                    "DIOCGDINFO for disk device %s", s);
        }

        /* DIOCGDINFO didn't fail */
        (void)memset(dkw, 0, sizeof(*dkw));

        if (stat(s, &sb) == -1)
                return 0;

        ptn = DISKPART(sb.st_rdev);
        if (ptn < 0 || ptn >= lp->d_npartitions)
                return 0;

        pp = &lp->d_partitions[ptn];
        if (ptn != getrawpartition()) {
                dkw->dkw_offset = pp->p_offset;
                dkw->dkw_size = pp->p_size;
        } else {
                dkw->dkw_offset = 0;
                dkw->dkw_size = geo->dg_secperunit;
        }
        dkw->dkw_parent[0] = '*';
        strlcpy(dkw->dkw_ptype, getfstypename(pp->p_fstype),
            sizeof(dkw->dkw_ptype));

        return 0;
}

int
getdisksize(const char *name, u_int *secsize, off_t *mediasize)
{
        char buf[MAXPATHLEN];
        struct disk_geom geo;
        int fd, error;

        if ((fd = opendisk(name, O_RDONLY, buf, sizeof(buf), 0)) == -1)
                return -1;

        error = getdiskinfo(name, fd, NULL, &geo, NULL);
        close(fd);
        if (error)
                return error;

        *secsize = geo.dg_secsize;
        *mediasize = geo.dg_secsize * geo.dg_secperunit;
        return 0;
}