Annotation of sys/arch/amd64/amd64/disksubr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: disksubr.c,v 1.53 2007/06/20 18:15:45 deraadt Exp $ */
! 2: /* $NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1996 Theo de Raadt
! 6: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. Neither the name of the University nor the names of its contributors
! 18: * may be used to endorse or promote products derived from this software
! 19: * without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 31: * SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/param.h>
! 35: #include <sys/systm.h>
! 36: #include <sys/buf.h>
! 37: #include <sys/disklabel.h>
! 38: #include <sys/disk.h>
! 39: #include <sys/reboot.h>
! 40: #include <sys/conf.h>
! 41:
! 42: #include <machine/biosvar.h>
! 43:
! 44: /*
! 45: * Attempt to read a disk label from a device
! 46: * using the indicated strategy routine.
! 47: * The label must be partly set up before this:
! 48: * secpercyl, secsize and anything required for a block i/o read
! 49: * operation in the driver's strategy/start routines
! 50: * must be filled in before calling us.
! 51: *
! 52: * If dos partition table requested, attempt to load it and
! 53: * find disklabel inside a DOS partition. Return buffer
! 54: * for use in signalling errors if requested.
! 55: *
! 56: * We would like to check if each MBR has a valid DOSMBR_SIGNATURE, but
! 57: * we cannot because it doesn't always exist. So.. we assume the
! 58: * MBR is valid.
! 59: *
! 60: * Returns null on success and an error string on failure.
! 61: */
! 62: bios_diskinfo_t *bios_getdiskinfo(dev_t dev);
! 63:
! 64: char *
! 65: readdisklabel(dev_t dev, void (*strat)(struct buf *),
! 66: struct disklabel *lp, int spoofonly)
! 67: {
! 68: bios_diskinfo_t *pdi;
! 69: struct buf *bp = NULL;
! 70: dev_t devno;
! 71: char *msg;
! 72:
! 73: if ((msg = initdisklabel(lp)))
! 74: goto done;
! 75:
! 76: /* Look for any BIOS geometry information we should honour. */
! 77: devno = chrtoblk(dev);
! 78: if (devno == NODEV)
! 79: devno = dev;
! 80: pdi = bios_getdiskinfo(MAKEBOOTDEV(major(devno), 0, 0, DISKUNIT(devno),
! 81: RAW_PART));
! 82: if (pdi != NULL && pdi->bios_heads > 0 && pdi->bios_sectors > 0) {
! 83: #ifdef DEBUG
! 84: printf("Disk GEOM %u/%u/%u -> BIOS GEOM %u/%u/%u\n",
! 85: lp->d_ntracks, lp->d_nsectors, lp->d_ncylinders,
! 86: pdi->bios_heads, pdi->bios_sectors,
! 87: DL_GETDSIZE(lp) / (pdi->bios_heads * pdi->bios_sectors));
! 88: #endif
! 89: lp->d_ntracks = pdi->bios_heads;
! 90: lp->d_nsectors = pdi->bios_sectors;
! 91: lp->d_secpercyl = pdi->bios_sectors * pdi->bios_heads;
! 92: lp->d_ncylinders = DL_GETDSIZE(lp) / lp->d_secpercyl;
! 93: }
! 94:
! 95: /* get a buffer and initialize it */
! 96: bp = geteblk((int)lp->d_secsize);
! 97: bp->b_dev = dev;
! 98:
! 99: msg = readdoslabel(bp, strat, lp, NULL, spoofonly);
! 100: if (msg == NULL)
! 101: goto done;
! 102:
! 103: #if defined(CD9660)
! 104: if (iso_disklabelspoof(dev, strat, lp) == 0) {
! 105: msg = NULL;
! 106: goto done;
! 107: }
! 108: #endif
! 109: #if defined(UDF)
! 110: if (udf_disklabelspoof(dev, strat, lp) == 0) {
! 111: msg = NULL;
! 112: goto done;
! 113: }
! 114: #endif
! 115:
! 116: done:
! 117: if (bp) {
! 118: bp->b_flags |= B_INVAL;
! 119: brelse(bp);
! 120: }
! 121: return (msg);
! 122: }
! 123:
! 124: /*
! 125: * Write disk label back to device after modification.
! 126: */
! 127: int
! 128: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
! 129: {
! 130: int error = EIO, partoff = -1;
! 131: struct disklabel *dlp;
! 132: struct buf *bp = NULL;
! 133:
! 134: /* get a buffer and initialize it */
! 135: bp = geteblk((int)lp->d_secsize);
! 136: bp->b_dev = dev;
! 137:
! 138: if (readdoslabel(bp, strat, lp, &partoff, 1) != NULL)
! 139: goto done;
! 140:
! 141: /* Read it in, slap the new label in, and write it back out */
! 142: bp->b_blkno = partoff + LABELSECTOR;
! 143: bp->b_bcount = lp->d_secsize;
! 144: bp->b_flags = B_BUSY | B_READ;
! 145: (*strat)(bp);
! 146: if ((error = biowait(bp)) != 0)
! 147: goto done;
! 148:
! 149: dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
! 150: *dlp = *lp;
! 151: bp->b_flags = B_BUSY | B_WRITE;
! 152: (*strat)(bp);
! 153: error = biowait(bp);
! 154:
! 155: done:
! 156: if (bp) {
! 157: bp->b_flags |= B_INVAL;
! 158: brelse(bp);
! 159: }
! 160: return (error);
! 161: }
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