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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: }