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Annotation of sys/arch/mvmeppc/mvmeppc/disksubr.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: disksubr.c,v 1.54 2007/06/20 18:15:46 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: }