358 lines
9.0 KiB
C
358 lines
9.0 KiB
C
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/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 1998 Doug Rabson <dfr@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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/*
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* ARC disk device handling.
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*
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* Ideas and algorithms from:
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*
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* - NetBSD libi386/biosdisk.c
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* - FreeBSD biosboot/disk.c
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*
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* XXX Todo: add bad144 support.
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*/
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#include <stand.h>
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#include <sys/disklabel.h>
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#include <sys/diskslice.h>
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#include <machine/stdarg.h>
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#include "bootstrap.h"
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#include "libarc.h"
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#include "arctypes.h"
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#include "arcfuncs.h"
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#define ARCDISK_SECSIZE 512
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#define BUFSIZE (1 * ARCDISK_SECSIZE)
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#define MAXBDDEV MAXDEV
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#ifdef DISK_DEBUG
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# define D(x) x
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#else
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# define D(x)
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#endif
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static int bd_init(void);
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static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize);
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static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize);
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static int bd_open(struct open_file *f, void *vdev);
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static int bd_close(struct open_file *f);
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static void bd_print(int verbose);
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struct open_disk {
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int od_fd;
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int od_unit; /* our unit number */
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int od_boff; /* block offset from beginning of ARC disk */
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int od_flags;
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#define BD_FLOPPY (1<<2)
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u_char od_buf[BUFSIZE]; /* transfer buffer (do we want/need this?) */
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};
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struct devsw arcdisk = {
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"disk",
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DEVT_DISK,
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bd_init,
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bd_strategy,
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bd_open,
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bd_close,
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noioctl,
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bd_print
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};
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/*
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* List of ARC devices, translation from disk unit number to
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* ARC unit number.
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*/
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static struct
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{
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char bd_name[64];
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int bd_unit; /* ARC unit number */
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int bd_namelen;
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int bd_flags;
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} bdinfo [MAXBDDEV];
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static int nbdinfo = 0;
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/*
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* Quiz ARC for disk devices, save a little info about them.
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*/
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static int
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bd_init(void)
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{
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nbdinfo++;
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return (0);
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}
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/*
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* Print information about disks
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*/
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static void
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bd_print(int verbose)
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{
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int i;
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char line[80];
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for (i = 0; i < nbdinfo; i++) {
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sprintf(line, " disk%d: ARC drive %s", i, bdinfo[i].bd_name);
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pager_output(line);
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/* XXX more detail? */
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pager_output("\n");
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}
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}
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/*
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* Attempt to open the disk described by (dev) for use by (f).
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*
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* Note that the philosophy here is "give them exactly what
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* they ask for". This is necessary because being too "smart"
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* about what the user might want leads to complications.
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* (eg. given no slice or partition value, with a disk that is
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* sliced - are they after the first BSD slice, or the DOS
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* slice before it?)
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*/
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static int
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bd_open(struct open_file *f, void *vdev)
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{
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struct arc_devdesc *dev = vdev;
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struct dos_partition *dptr;
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struct open_disk *od;
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struct disklabel *lp;
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int sector, slice, i;
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int error;
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int unit;
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u_int32_t fd;
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unit = dev->d_kind.arcdisk.unit;
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if (unit >= nbdinfo) {
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D(printf("attempt to open nonexistent disk\n"));
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return(ENXIO);
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}
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if (Open("scsi(0)disk(0)rdisk(0)partition(0)",
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OpenReadOnly, &fd) != ESUCCESS)
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if (Open("scsi(0)disk(1)rdisk(0)partition(0)",
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OpenReadOnly, &fd) != ESUCCESS)
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if (Open("multi(0)disk(0)fdisk(0)partition(0)",
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OpenReadOnly, &fd) != ESUCCESS)
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return(ENXIO);
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od = (struct open_disk *) malloc(sizeof(struct open_disk));
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if (!od) {
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D(printf("arcdiskopen: no memory\n"));
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return (ENOMEM);
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}
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/* Look up ARC unit number, intialise open_disk structure */
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od->od_fd = fd;
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od->od_unit = dev->d_kind.arcdisk.unit;
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od->od_flags = bdinfo[od->od_unit].bd_flags;
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od->od_boff = 0;
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error = 0;
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#if 0
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/* Get geometry for this open (removable device may have changed) */
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if (set_geometry(&od->od_ll)) {
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D(printf("bd_open: can't get geometry\n"));
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error = ENXIO;
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goto out;
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}
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#endif
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/*
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* Following calculations attempt to determine the correct value
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* for d->od_boff by looking for the slice and partition specified,
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* or searching for reasonable defaults.
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*/
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#if 0
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/*
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* Find the slice in the DOS slice table.
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*/
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if (readsects(&od->od_ll, 0, 1, od->od_buf, 0)) {
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D(printf("bd_open: error reading MBR\n"));
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error = EIO;
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goto out;
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}
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/*
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* Check the slice table magic.
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*/
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if ((od->od_buf[0x1fe] != 0xff) || (od->od_buf[0x1ff] != 0xaa)) {
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/* If a slice number was explicitly supplied, this is an error */
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if (dev->d_kind.arcdisk.slice > 0) {
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D(printf("bd_open: no slice table/MBR (no magic)\n"));
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error = ENOENT;
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goto out;
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}
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sector = 0;
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goto unsliced; /* may be a floppy */
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}
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dptr = (struct dos_partition *) & od->od_buf[DOSPARTOFF];
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/*
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* XXX No support here for 'extended' slices
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*/
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if (dev->d_kind.arcdisk.slice <= 0) {
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/*
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* Search for the first FreeBSD slice; this also works on "unsliced"
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* disks, as they contain a "historically bogus" MBR.
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*/
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for (i = 0; i < NDOSPART; i++, dptr++)
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if (dptr->dp_typ == DOSPTYP_386BSD) {
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sector = dptr->dp_start;
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break;
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}
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/* Did we find something? */
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if (sector == -1) {
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error = ENOENT;
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goto out;
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}
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} else {
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/*
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* Accept the supplied slice number unequivocally (we may be looking
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* for a DOS partition) if we can handle it.
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*/
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if ((dev->d_kind.arcdisk.slice > NDOSPART) || (dev->d_kind.arcdisk.slice < 1)) {
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error = ENOENT;
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goto out;
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}
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dptr += (dev->d_kind.arcdisk.slice - 1);
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sector = dptr->dp_start;
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}
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unsliced:
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#else
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sector = 0;
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#endif
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/*
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* Now we have the slice, look for the partition in the disklabel if we have
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* a partition to start with.
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*/
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if (dev->d_kind.arcdisk.partition < 0) {
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od->od_boff = sector; /* no partition, must be after the slice */
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} else {
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if (bd_strategy(od, F_READ, sector + LABELSECTOR, 512, od->od_buf, 0)) {
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D(printf("bd_open: error reading disklabel\n"));
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error = EIO;
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goto out;
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}
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lp = (struct disklabel *) (od->od_buf + LABELOFFSET);
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if (lp->d_magic != DISKMAGIC) {
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D(printf("bd_open: no disklabel\n"));
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error = ENOENT;
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goto out;
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} else if (dev->d_kind.arcdisk.partition >= lp->d_npartitions) {
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/*
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* The partition supplied is out of bounds; this is fatal.
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*/
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D(printf("partition '%c' exceeds partitions in table (a-'%c')\n",
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'a' + dev->d_kind.arcdisk.partition, 'a' + lp->d_npartitions));
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error = EPART;
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goto out;
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} else {
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/*
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* Complain if the partition type is wrong and it shouldn't be, but
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* regardless accept this partition.
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*/
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D(if ((lp->d_partitions[dev->d_kind.arcdisk.partition].p_fstype == FS_UNUSED) &&
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!(od->od_flags & BD_FLOPPY)) /* Floppies often have bogus fstype */
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printf("bd_open: warning, partition marked as unused\n"););
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od->od_boff = lp->d_partitions[dev->d_kind.arcdisk.partition].p_offset;
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}
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}
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/*
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* Save our context
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*/
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f->f_devdata = od;
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out:
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if (error)
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free(od);
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return(error);
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}
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static int
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bd_close(struct open_file *f)
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{
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struct open_disk *od = f->f_devdata;
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Close(od->od_fd);
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free(od);
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f->f_devdata = NULL;
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return(0);
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}
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static int
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bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, void *buf, size_t *rsize)
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{
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struct bcache_devdata bcd;
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bcd.dv_strategy = bd_realstrategy;
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bcd.dv_devdata = devdata;
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return(bcache_strategy(&bcd, rw, dblk, size, buf, rsize));
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}
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static int
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bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
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{
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struct open_disk *od = (struct open_disk *)devdata;
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fpos_t seek;
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u_int32_t count;
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if (size % ARCDISK_SECSIZE)
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panic("bd_strategy: I/O not block multiple");
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if (flag != F_READ)
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return(EROFS);
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if (rsize)
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*rsize = 0;
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seek = 512 * (dblk + od->od_boff);
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Seek(od->od_fd, &seek, SeekAbsolute);
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if (Read(od->od_fd, buf, size, &count) != ESUCCESS) {
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D(printf("read error\n"));
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return (EIO);
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}
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if (rsize)
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*rsize = count;
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return (0);
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}
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