libadm/common/rdwr_vtoc.c

	rdwr_vtoc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1991-1997,2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*LINTLIBRARY*/


#include <stdio.h>
#include <errno.h>
#include <memory.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/dkio.h>
#include <sys/vtoc.h>

/*
 * Read VTOC - return partition number.
 */
int
read_vtoc(int fd, struct vtoc *vtoc)
{
    struct dk_cinfo     dki_info;

    /*
     * Read the vtoc.
     */
    if (ioctl(fd, DKIOCGVTOC, (caddr_t)vtoc) == -1) {
        switch (errno) {
        case EIO:
            return (VT_EIO);
        case EINVAL:
            return (VT_EINVAL);
        /* for disks > 1TB */
        case ENOTSUP:
            return (VT_ENOTSUP);
        default:
            return (VT_ERROR);
        }
    }

    /*
     * Sanity-check the vtoc.
     */
    if (vtoc->v_sanity != VTOC_SANE) {
        return (VT_EINVAL);
    }

    /*
     * Convert older-style vtoc's.
     */
    switch (vtoc->v_version) {
    case 0:
        /*
         * No vtoc information.  Install default
         * nparts/sectorsz and version.  We are
         * assuming that the driver returns the
         * current partition information correctly.
         */

        vtoc->v_version = V_VERSION;
        if (vtoc->v_nparts == 0)
            vtoc->v_nparts = V_NUMPAR;
        if (vtoc->v_sectorsz == 0)
            vtoc->v_sectorsz = DEV_BSIZE;

        break;

    case V_VERSION:
        break;

    default:
        return (VT_EINVAL);
    }

    /*
     * Return partition number for this file descriptor.
     */
    if (ioctl(fd, DKIOCINFO, (caddr_t)&dki_info) == -1) {
        switch (errno) {
        case EIO:
            return (VT_EIO);
        case EINVAL:
            return (VT_EINVAL);
        default:
            return (VT_ERROR);
        }
    }
    if (dki_info.dki_partition > V_NUMPAR) {
        return (VT_EINVAL);
    }
    return ((int)dki_info.dki_partition);
}

/*
 * Write VTOC
 */
int
write_vtoc(int fd, struct vtoc *vtoc)
{
    int i;
    /*
     * Sanity-check the vtoc
     */
    if (vtoc->v_sanity != VTOC_SANE || vtoc->v_nparts > V_NUMPAR) {
        return (-1);
    }

    /*
     * since many drivers won't allow opening a device make sure
     * all partitions aren't being set to zero. If all are zero then
     * we have no way to set them to something else
     */

    for (i = 0; i < (int)vtoc->v_nparts; i++)
        if (vtoc->v_part[i].p_size > 0)
            break;
    if (i == (int)vtoc->v_nparts)
        return (-1);

    /*
     * Write the vtoc
     */
    if (ioctl(fd, DKIOCSVTOC, (caddr_t)vtoc) == -1) {
        switch (errno) {
        case EIO:
            return (VT_EIO);
        case EINVAL:
            return (VT_EINVAL);
        /* for disks > 1TB */
        case ENOTSUP:
            return (VT_ENOTSUP);
        default:
            return (VT_ERROR);
        }
    }
    return (0);
}