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Annotation of sys/arch/hp300/hp300/disksubr.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: disksubr.c,v 1.41 2007/06/20 18:15:45 deraadt Exp $   */
        !             2: /*     $NetBSD: disksubr.c,v 1.9 1997/04/01 03:12:13 scottr Exp $      */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1982, 1986, 1988, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  * (c) UNIX System Laboratories, Inc.
        !             8:  * All or some portions of this file are derived from material licensed
        !             9:  * to the University of California by American Telephone and Telegraph
        !            10:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            11:  * the permission of UNIX System Laboratories, Inc.
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  */
        !            37:
        !            38: #include <sys/param.h>
        !            39: #include <sys/systm.h>
        !            40: #include <sys/buf.h>
        !            41: #include <sys/disk.h>
        !            42: #include <sys/disklabel.h>
        !            43: #include <sys/syslog.h>
        !            44:
        !            45: /*
        !            46:  * Attempt to read a disk label from a device using the indicated strategy
        !            47:  * routine.  The label must be partly set up before this: secpercyl and
        !            48:  * anything required in the strategy routine (e.g., sector size) must be
        !            49:  * filled in before calling us.  Returns null on success and an error
        !            50:  * string on failure.
        !            51:  */
        !            52: char *
        !            53: readdisklabel(dev_t dev, void (*strat)(struct buf *),
        !            54:     struct disklabel *lp, int spoofonly)
        !            55: {
        !            56:        struct buf *bp = NULL;
        !            57:        char *msg;
        !            58:
        !            59:        if ((msg = initdisklabel(lp)))
        !            60:                goto done;
        !            61:
        !            62:        bp = geteblk((int)lp->d_secsize);
        !            63:        bp->b_dev = dev;
        !            64:
        !            65:        /* don't read the on-disk label if we are in spoofed-only mode */
        !            66:        if (spoofonly)
        !            67:                goto done;
        !            68:
        !            69:        bp->b_blkno = LABELSECTOR;
        !            70:        bp->b_bcount = lp->d_secsize;
        !            71:        bp->b_flags = B_BUSY | B_READ;
        !            72:        (*strat)(bp);
        !            73:        if (biowait(bp)) {
        !            74:                msg = "disk label I/O error";
        !            75:                goto done;
        !            76:        }
        !            77:
        !            78:        msg = checkdisklabel(bp->b_data + LABELOFFSET, lp);
        !            79:        if (msg == NULL)
        !            80:                goto done;
        !            81:
        !            82: #if defined(CD9660)
        !            83:        if (iso_disklabelspoof(dev, strat, lp) == 0) {
        !            84:                msg = NULL;
        !            85:                goto done;
        !            86:        }
        !            87: #endif
        !            88: #if defined(UDF)
        !            89:        if (udf_disklabelspoof(dev, strat, lp) == 0) {
        !            90:                msg = NULL;
        !            91:                goto done;
        !            92:        }
        !            93: #endif
        !            94:
        !            95: done:
        !            96:        if (bp) {
        !            97:                bp->b_flags |= B_INVAL;
        !            98:                brelse(bp);
        !            99:        }
        !           100:        return (msg);
        !           101: }
        !           102:
        !           103: /*
        !           104:  * Write disk label back to device after modification.
        !           105:  */
        !           106: int
        !           107: writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
        !           108: {
        !           109:        struct buf *bp = NULL;
        !           110:        struct disklabel *dlp;
        !           111:        int error = 0;
        !           112:
        !           113:        /* get a buffer and initialize it */
        !           114:        bp = geteblk((int)lp->d_secsize);
        !           115:        bp->b_dev = dev;
        !           116:        bp->b_blkno = LABELSECTOR;
        !           117:        bp->b_bcount = lp->d_secsize;
        !           118:        bp->b_flags = B_BUSY | B_READ;
        !           119:        (*strat)(bp);
        !           120:        if ((error = biowait(bp)) != 0)
        !           121:                goto done;
        !           122:
        !           123:        /* Write it in the regular place. */
        !           124:        dlp = (struct disklabel *)(bp->b_data + LABELOFFSET);
        !           125:        *dlp = *lp;
        !           126:        bp->b_flags = B_BUSY | B_WRITE;
        !           127:        (*strat)(bp);
        !           128:        error = biowait(bp);
        !           129:
        !           130: done:
        !           131:        if (bp) {
        !           132:                bp->b_flags |= B_INVAL;
        !           133:                brelse(bp);
        !           134:        }
        !           135:        return (error);
        !           136: }