Annotation of sys/arch/aviion/aviion/disksubr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: disksubr.c,v 1.39 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:
! 40: /*
! 41: * Attempt to read a disk label from a device
! 42: * using the indicated strategy routine.
! 43: * The label must be partly set up before this:
! 44: * secpercyl, secsize and anything required for a block i/o read
! 45: * operation in the driver's strategy/start routines
! 46: * must be filled in before calling us.
! 47: *
! 48: * If dos partition table requested, attempt to load it and
! 49: * find disklabel inside a DOS partition. Return buffer
! 50: * for use in signalling errors if requested.
! 51: *
! 52: * We would like to check if each MBR has a valid DOSMBR_SIGNATURE, but
! 53: * we cannot because it doesn't always exist. So.. we assume the
! 54: * MBR is valid.
! 55: *
! 56: * Returns null on success and an error string on failure.
! 57: */
! 58: char *
! 59: readdisklabel(dev_t dev, void (*strat)(struct buf *),
! 60: struct disklabel *lp, int spoofonly)
! 61: {
! 62: struct buf *bp = NULL;
! 63: char *msg;
! 64:
! 65: if ((msg = initdisklabel(lp)))
! 66: goto done;
! 67:
! 68: /* get a buffer and initialize it */
! 69: bp = geteblk((int)lp->d_secsize);
! 70: bp->b_dev = dev;
! 71:
! 72: msg = readdoslabel(bp, strat, lp, NULL, spoofonly);
! 73: if (msg == NULL)
! 74: goto done;
! 75:
! 76: #if defined(CD9660)
! 77: if (iso_disklabelspoof(dev, strat, lp) == 0) {
! 78: msg = NULL;
! 79: goto done;
! 80: }
! 81: #endif
! 82: #if defined(UDF)
! 83: if (udf_disklabelspoof(dev, strat, lp) == 0) {
! 84: msg = NULL;
! 85: goto done;
! 86: }
! 87: #endif
! 88:
! 89: done:
! 90: if (bp) {
! 91: bp->b_flags |= B_INVAL;
! 92: brelse(bp);
! 93: }
! 94: return (msg);
! 95: }
! 96:
! 97: /*
! 98: * Write disk label back to device after modification.
! 99: */
! 100: int
! 101: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
! 102: {
! 103: int error = EIO, partoff = -1, cyl = 0;
! 104: struct disklabel *dlp;
! 105: struct buf *bp = NULL;
! 106:
! 107: /* get a buffer and initialize it */
! 108: bp = geteblk((int)lp->d_secsize);
! 109: bp->b_dev = dev;
! 110:
! 111: if (readdoslabel(bp, strat, lp, &partoff, 1) != NULL)
! 112: goto done;
! 113:
! 114: /* Read it in, slap the new label in, and write it back out */
! 115: bp->b_blkno = partoff + LABELSECTOR;
! 116: bp->b_bcount = lp->d_secsize;
! 117: bp->b_flags = B_BUSY | B_READ;
! 118: (*strat)(bp);
! 119: if ((error = biowait(bp)) != 0)
! 120: goto done;
! 121:
! 122: dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
! 123: *dlp = *lp;
! 124: bp->b_flags = B_BUSY | B_WRITE;
! 125: (*strat)(bp);
! 126: error = biowait(bp);
! 127:
! 128: done:
! 129: if (bp) {
! 130: bp->b_flags |= B_INVAL;
! 131: brelse(bp);
! 132: }
! 133: return (error);
! 134: }
CVSweb