/*      $NetBSD: disksubr.c,v 1.56 2019/12/15 12:50:39 martin Exp $     */

/*
 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)ufs_disksubr.c      7.16 (Berkeley) 5/4/91
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.56 2019/12/15 12:50:39 martin Exp $");

#include "opt_compat_ultrix.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/disk.h>
#include <sys/disklabel.h>

#include <dev/dec/dec_boot.h>
#include <ufs/ufs/dinode.h>             /* XXX for fs.h */
#include <ufs/ffs/fs.h>                 /* XXX for BBSIZE & SBSIZE */

const char *compat_label(dev_t dev, void (*strat)(struct buf *bp),
        struct disklabel *lp, struct cpu_disklabel *osdep);     /* XXX */

/*
 * Attempt to read a disk label from a device
 * using the indicated strategy routine.
 * The label must be partly set up before this:
 * secpercyl and anything required in the strategy routine
 * (e.g., sector size) must be filled in before calling us.
 * Returns null on success and an error string on failure.
 */
const char *
readdisklabel(dev_t dev, void (*strat)(struct buf *bp), struct disklabel *lp,
    struct cpu_disklabel *osdep)
{
        struct buf *bp;
        struct disklabel *dlp;
        const char *msg = NULL;

        if (lp->d_secperunit == 0)
                lp->d_secperunit = 0x1fffffff;
        lp->d_npartitions = 1;
        if (lp->d_partitions[0].p_size == 0)
                lp->d_partitions[0].p_size = 0x1fffffff;
        lp->d_partitions[0].p_offset = 0;

        bp = geteblk((int)lp->d_secsize);
        bp->b_dev = dev;
        bp->b_blkno = LABELSECTOR;
        bp->b_bcount = lp->d_secsize;
        bp->b_flags |= B_READ;
        bp->b_cylinder = LABELSECTOR / lp->d_secpercyl;
        (*strat)(bp);
        if (biowait(bp)) {
                msg = "I/O error";
        } else for (dlp = (struct disklabel *)bp->b_data;
            dlp <= (struct disklabel *)
            ((char *)bp->b_data + DEV_BSIZE - sizeof(*dlp));
            dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
                if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
                        if (msg == NULL)
                                msg = "no disk label";
                } else if (dlp->d_npartitions > MAXPARTITIONS ||
                           dkcksum(dlp) != 0)
                        msg = "disk label corrupted";
                else {
                        *lp = *dlp;
                        msg = NULL;
                        break;
                }
        }
        brelse(bp, 0);
        /*
         * If no NetBSD label was found, check for an Ultrix label and
         * construct tne incore label from the Ultrix partition information.
         */
        if (msg != NULL) {
                msg = compat_label(dev, strat, lp, osdep);
                if (msg == NULL) {
                        printf("WARNING: using Ultrix partition information\n");
                        /* set geometry? */
                }
        }
/* XXX If no NetBSD label or Ultrix label found, generate default label here */
        return msg;
}

/*
 * Given a buffer bp, try and interpret it as an Ultrix disk label,
 * putting the partition info into a native NetBSD label
 */
const char *
compat_label(dev_t dev, void (*strat)(struct buf *bp), struct disklabel *lp,
    struct cpu_disklabel *osdep)
{
        dec_disklabel *dlp;
        struct buf *bp = NULL;
        const char *msg = NULL;

        bp = geteblk((int)lp->d_secsize);
        bp->b_dev = dev;
        bp->b_blkno = DEC_LABEL_SECTOR;
        bp->b_bcount = lp->d_secsize;
        bp->b_flags |= B_READ;
        bp->b_cylinder = DEC_LABEL_SECTOR / lp->d_secpercyl;
        (*strat)(bp);

        if (biowait(bp)) {
                msg = "I/O error";
                goto done;
        }

        for (dlp = (dec_disklabel *)bp->b_data;
             dlp <= (dec_disklabel *)
             ((char *)bp->b_data + DEV_BSIZE - sizeof(*dlp));
             dlp = (dec_disklabel *)((char *)dlp + sizeof(long))) {

                int part;

                if (dlp->magic != DEC_LABEL_MAGIC) {
#if 0
                        printf("label: %x\n",dlp->magic);
#endif
                        msg = ((msg != NULL) ? msg: "no disk label");
                        goto done;
                }

#ifdef DIAGNOSTIC
/*XXX*/         printf("Interpreting Ultrix label\n");
#endif

                lp->d_magic = DEC_LABEL_MAGIC;
                lp->d_npartitions = 0;
                strncpy(lp->d_packname, "Ultrix label", 16);
                lp->d_rpm = 3600;
                lp->d_interleave = 1;
                lp->d_flags = 0;
                lp->d_bbsize = BBSIZE;
                lp->d_sbsize = SBLOCKSIZE;
                for (part = 0;
                     part <((MAXPARTITIONS<DEC_NUM_DISK_PARTS) ?
                            MAXPARTITIONS : DEC_NUM_DISK_PARTS);
                     part++) {
                        lp->d_partitions[part].p_size =
                            dlp->map[part].num_blocks;
                        lp->d_partitions[part].p_offset =
                            dlp->map[part].start_block;
                        lp->d_partitions[part].p_fsize = 1024;
                        lp->d_partitions[part].p_fstype =
                          (part==1) ? FS_SWAP : FS_BSDFFS;
                        lp->d_npartitions += 1;

#ifdef DIAGNOSTIC
                        printf(" Ultrix label rz%d%c: start %d len %d\n",
                               DISKUNIT(dev), "abcdefgh"[part],
                               lp->d_partitions[part].p_offset,
                               lp->d_partitions[part].p_size);
#endif
                }
                break;
        }

done:
        brelse(bp, 0);
        return msg;
}

/*
 * Write disk label back to device after modification.
 */
int
writedisklabel(dev_t dev, void (*strat)(struct buf *bp), struct disklabel *lp,
    struct cpu_disklabel *osdep)
{
        struct buf *bp;
        struct disklabel *dlp;
        int labelpart;
        int error = 0;

        labelpart = DISKPART(dev);
        if (lp->d_partitions[labelpart].p_offset != 0) {
                if (lp->d_partitions[0].p_offset != 0)
                        return EXDEV;                   /* not quite right */
                labelpart = 0;
        }
        bp = geteblk((int)lp->d_secsize);
        bp->b_dev = makedev(major(dev), DISKMINOR(DISKUNIT(dev), labelpart));
        bp->b_blkno = LABELSECTOR;
        bp->b_bcount = lp->d_secsize;
        bp->b_flags |= B_READ;
        (*strat)(bp);
        if ((error = biowait(bp)) != 0)
                goto done;
        for (dlp = (struct disklabel *)bp->b_data;
            dlp <= (struct disklabel *)
              ((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
            dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
                if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
                    dkcksum(dlp) == 0) {
                        *dlp = *lp;
                        bp->b_oflags &= ~(BO_DONE);
                        bp->b_flags &= ~(B_READ);
                        bp->b_flags |= B_WRITE;
                        (*strat)(bp);
                        error = biowait(bp);
                        goto done;
                }
        }
        error = ESRCH;
done:
        brelse(bp, 0);
        return error;
}