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Annotation of sys/arch/aviion/aviion/disksubr.c, Revision 1.1.1.1

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: }