/*      $NetBSD: read.c,v 1.4 2009/03/14 21:04:06 dsl Exp $     */

/*
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julian Coleman, Waldi Ravens and Leo Weppelman.
*
* 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 "privahdi.h"
#include <fcntl.h>
#ifdef DEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <sys/dkio.h>
#include <sys/ioctl.h>

/*
* Read AHDI partitions from disk.
*/
int
ahdi_readlabel (struct ahdi_ptable *ptable, char *diskname, int flags)
{
       int                      fd, rv;
       struct disklabel        *dl;

       if (!(fd = openraw (diskname, O_RDONLY)))
               return (-1);

       if ((dl = read_dl (fd)) == NULL) {
               close (fd);
               return (-1);
       }

       if (dl->d_secsize != AHDI_BSIZE) {
               close (fd);
               return (-2);
       }

       if ((rv = check_magic(fd, LABELSECTOR, flags)) < 0) {
               close (fd);
               return (rv);
       }

       bzero ((void *) ptable, sizeof (struct ahdi_ptable));

       if ((rv = read_rsec (fd, ptable, AHDI_BBLOCK, AHDI_BBLOCK, flags))
           < 0) {
               close (fd);
               return (rv);
       }

       if (dl->d_secperunit != ptable->secperunit) {
               if (flags & AHDI_IGN_SPU)
                       ptable->secperunit = dl->d_secperunit;
               else {
                       close (fd);
                       return (-6);
               }
       }

       ptable->nsectors = dl->d_nsectors;
       ptable->ntracks = dl->d_ntracks;
       ptable->ncylinders = dl->d_ncylinders;
       ptable->secpercyl = dl->d_secpercyl;

       assign_letters (ptable);

       close (fd);
       return (1);
}

/*
* Read AHDI partitions from root sector/auxillary root sector.
*/
int
read_rsec (int fd, struct ahdi_ptable *ptable, u_int rsec, u_int esec, int flags)
{
       struct ahdi_part        *part, *end;
       struct ahdi_root        *root;
       u_int16_t                cksum, newcksum;
       int                      rv;

       if ((root = disk_read (fd, rsec, 1)) == NULL) {
               return (-1);
       }

       if (rsec == AHDI_BBLOCK) {
               end = &root->ar_parts[AHDI_MAXRPD];
               if (root->ar_checksum) {
                       cksum = root->ar_checksum;
                       root->ar_checksum = 0;
                       newcksum = ahdi_cksum (root);
                       if ((cksum != newcksum) && !(flags & AHDI_IGN_CKSUM)) {
                               free (root);
                               return (-4);
                       }
               }
               ptable->secperunit=root->ar_hdsize;
       } else
               end = &root->ar_parts[AHDI_MAXARPD];
       for (part = root->ar_parts; part < end; ++part) {
#ifdef DEBUG
               printf ("Found partitions at sector %u:\n", rsec);
               printf ("  flags : %02x\n", part->ap_flg);
               printf ("  id    : %c%c%c\n", part->ap_id[0], part->ap_id[1],
                   part->ap_id[2]);
               printf ("  start : %u\n", part->ap_st);
               printf ("  size  : %u\n", part->ap_size);
#endif
               if (!(part->ap_flg & 0x01)) {
                       if ((part->ap_id[0] || part->ap_id[1] ||
                           part->ap_id[2]) && (flags & AHDI_IGN_EXISTS))
                               part->ap_flg &= 0x01;
                       else
                               continue;
               }

               if (AHDI_MKPID (part->ap_id[0], part->ap_id[1],
                   part->ap_id[2]) == AHDI_PID_XGM) {
                       u_int   offs = part->ap_st + esec;
                       if ((rv = read_rsec (fd, ptable, offs,
                           esec == AHDI_BBLOCK ? offs : esec, flags)) < 0) {
                               free (root);
                               return (rv);
                       }
               } else {
                       /* Attempt to check for junk values */
                       if (((part->ap_st + rsec) > ptable->secperunit ||
                           (part->ap_st + rsec + part->ap_size -1) >
                           ptable->secperunit)) {
                               if (flags & AHDI_IGN_EXT) {
                                       /* Fake previous partition */
                                       ptable->parts[ptable->nparts].id[0] =
                                           part->ap_id[0];
                                       ptable->parts[ptable->nparts].id[1] =
                                           part->ap_id[1];
                                       ptable->parts[ptable->nparts].id[2] =
                                           part->ap_id[2];
                               } else {
                                       free (root);
                                       return (-5);
                               }
                       }
                       ptable->parts[ptable->nparts].flag = part->ap_flg;
                       ptable->parts[ptable->nparts].id[0] = part->ap_id[0];
                       ptable->parts[ptable->nparts].id[1] = part->ap_id[1];
                       ptable->parts[ptable->nparts].id[2] = part->ap_id[2];
                       ptable->parts[ptable->nparts].root = rsec;
                       ptable->parts[ptable->nparts].start =
                           part->ap_st + rsec;
                       ptable->parts[ptable->nparts].size = part->ap_size;
                       ptable->nparts++;
               }
       }
       free (root);
       if (ptable->nparts || FORCE_AHDI)
               return (1);
       else
               return (-3);
}

/*
* Read a sector from the disk.
*/
void *
disk_read (fd, start, count)
       int      fd;
       u_int    start,
                count;
{
       void    *buffer;
       off_t   offset;
       size_t  size;


       size   = count * DEV_BSIZE;
       offset = start * DEV_BSIZE;

       if ((buffer = malloc (size)) == NULL)
               return (NULL);

       if (lseek (fd, offset, SEEK_SET) != offset) {
               free (buffer);
               return (NULL);
       }
       if (read (fd, buffer, size) != size) {
               free (buffer);
               return (NULL);
       }
       return (buffer);
}

/*
* Assign NetBSD drive letters to partitions
*/
void
assign_letters (struct ahdi_ptable *ptable)
{
       int             i, have_root, pno;
       u_int32_t       pid;

#define ROOT_PART 0

       have_root = 0;
       pno = 0;

       for (i = 0; i < ptable->nparts; i++) {
               while (pno == ROOT_PART || pno == SWAP_PART || pno == RAW_PART)
                       pno++;
               pid = AHDI_MKPID (ptable->parts[i].id[0],
                   ptable->parts[i].id[1], ptable->parts[i].id[2]);
               if (!have_root && pid == AHDI_PID_NBD) {
                       ptable->parts[i].letter = ROOT_PART;
                       have_root = 1;
               } else if (pid == AHDI_PID_SWP)
                       ptable->parts[i].letter = SWAP_PART;
               else {
                       ptable->parts[i].letter = pno;
                       pno++;
               }
       }
}

/*
* Read disklabel for disk.
*/
struct disklabel *
read_dl (int fd)
{
       struct disklabel        *dl;

       if ((dl = malloc (sizeof (struct disklabel))) == NULL) {
               return (NULL);
       }

       if (ioctl (fd, DIOCGDINFO, dl) < 0) {
               free (dl);
               return (NULL);
       }
       return (dl);
}

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