Annotation of sys/arch/alpha/alpha/disksubr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: disksubr.c,v 1.89 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) 1997 Niklas Hallqvist
! 6: * Copyright (c) 1996 Theo de Raadt
! 7: * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
! 8: * All rights reserved.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. Neither the name of the University nor the names of its contributors
! 19: * may be used to endorse or promote products derived from this software
! 20: * without specific prior written permission.
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 32: * SUCH DAMAGE.
! 33: */
! 34:
! 35: #include <sys/param.h>
! 36: #include <sys/systm.h>
! 37: #include <sys/buf.h>
! 38: #include <sys/disklabel.h>
! 39: #include <sys/disk.h>
! 40:
! 41: /*
! 42: * Attempt to read a disk label from a device
! 43: * using the indicated strategy routine.
! 44: * The label must be partly set up before this:
! 45: * secpercyl, secsize and anything required for a block i/o read
! 46: * operation in the driver's strategy/start routines
! 47: * must be filled in before calling us.
! 48: *
! 49: * Returns null on success and an error string on failure.
! 50: */
! 51: char *
! 52: readdisklabel(dev_t dev, void (*strat)(struct buf *),
! 53: struct disklabel *lp, int spoofonly)
! 54: {
! 55: struct buf *bp = NULL;
! 56: char *msg;
! 57:
! 58: if ((msg = initdisklabel(lp)))
! 59: goto done;
! 60:
! 61: /* get a buffer and initialize it */
! 62: bp = geteblk((int)lp->d_secsize);
! 63: bp->b_dev = dev;
! 64:
! 65: if (spoofonly)
! 66: goto doslabel;
! 67:
! 68: bp->b_blkno = LABELSECTOR;
! 69: bp->b_bcount = lp->d_secsize;
! 70: bp->b_flags = B_BUSY | B_READ;
! 71: (*strat)(bp);
! 72: if (biowait(bp)) {
! 73: msg = "disk label read error";
! 74: goto done;
! 75: }
! 76:
! 77: msg = checkdisklabel(bp->b_data + LABELOFFSET, lp);
! 78: if (msg == NULL)
! 79: goto done;
! 80:
! 81: doslabel:
! 82: msg = readdoslabel(bp, strat, lp, NULL, spoofonly);
! 83: if (msg == NULL)
! 84: goto done;
! 85:
! 86: #if defined(CD9660)
! 87: if (iso_disklabelspoof(dev, strat, lp) == 0) {
! 88: msg = NULL;
! 89: goto done;
! 90: }
! 91: #endif
! 92: #if defined(UDF)
! 93: if (udf_disklabelspoof(dev, strat, lp) == 0) {
! 94: msg = NULL;
! 95: goto done;
! 96: }
! 97: #endif
! 98:
! 99: done:
! 100: if (bp) {
! 101: bp->b_flags |= B_INVAL;
! 102: brelse(bp);
! 103: }
! 104: return (msg);
! 105: }
! 106:
! 107: /*
! 108: * Write disk label back to device after modification.
! 109: */
! 110: int
! 111: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
! 112: {
! 113: u_int64_t csum = 0, *p;
! 114: struct disklabel *dlp;
! 115: struct buf *bp = NULL;
! 116: int error, i;
! 117:
! 118: /* get a buffer and initialize it */
! 119: bp = geteblk((int)lp->d_secsize);
! 120: bp->b_dev = dev;
! 121:
! 122: bp->b_blkno = LABELSECTOR;
! 123: bp->b_bcount = lp->d_secsize;
! 124: bp->b_flags = B_BUSY | B_READ;
! 125: (*strat)(bp);
! 126: if ((error = biowait(bp)) != 0)
! 127: goto done;
! 128:
! 129: /* Write it in the regular place. */
! 130: dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
! 131: *dlp = *lp;
! 132:
! 133: /* Alpha bootblocks require a checksum over the sector */
! 134: for (i = 0, p = (u_int64_t *)bp->b_data; i < 63; i++)
! 135: csum += *p++;
! 136: *p = csum;
! 137:
! 138: bp->b_flags = B_BUSY | B_WRITE;
! 139: (*strat)(bp);
! 140: error = biowait(bp);
! 141:
! 142: done:
! 143: if (bp) {
! 144: bp->b_flags |= B_INVAL;
! 145: brelse(bp);
! 146: }
! 147: return (error);
! 148: }
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