libmeta/common/meta_devstamp.c

	meta_devstamp.c revision 342440ec94087b8c751c580ab9ed6c693d31d418
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * get timestamp from device
 */

#include <meta.h>

/*
 * get timestamp
 */
int
getdevstamp(
    mddrivename_t   *dnp,
    time_t      *stamp,     /* return timestamp here */
    md_error_t  *ep
)
{
    int     fd;
    int     partno;
    struct extvtoc  vtocbuf;
    mdname_t    *np;

    if ((np = metaslicename(dnp, MD_SLICE0, ep)) == NULL)
        return (-1);

    /* open given device */
    if ((fd = open(np->rname, O_RDONLY | O_NDELAY, 0)) < 0)
        return (mdsyserror(ep, errno, np->cname));

    /* re-read vtoc */
    if (meta_getvtoc(fd, np->cname, &vtocbuf, &partno, ep) == -1) {
        (void) close(fd);
        return (-1);
    }

    /* close device */
    (void) close(fd);   /* sd/ssd bug */

    /* return timestamp, success */
    *stamp = vtocbuf.timestamp[partno];
    return (0);
}

/*
 * returns
 *  0 on success,
 *  ENOTSUP if it's not a device with a vtoc
 *  -1 on failure
 */
int
setdevstamp(
    mddrivename_t   *dnp,
    time_t      *stamp,     /* returned timestamp */
    md_error_t  *ep
)
{
    int     fd;
    int     partno;
    struct extvtoc  vtocbuf;
    time_t      now = time(NULL);
    mdname_t    *np;

    if ((np = metaslicename(dnp, MD_SLICE0, ep)) == NULL)
        return (-1);

    /* open for vtoc */
    if ((fd = open(np->rname, O_RDWR | O_NDELAY, 0)) < 0)
        return (mdsyserror(ep, errno, np->cname));

    if (meta_getvtoc(fd, np->cname, &vtocbuf, &partno, ep) == -1) {
        (void) close(fd);
        if (partno == VT_ENOTSUP)
            return (ENOTSUP);
        else
            return (-1);
    }

    *stamp = vtocbuf.timestamp[partno] = now;

    if (meta_setvtoc(fd, np->cname, &vtocbuf, ep) == -1) {
        (void) close(fd);
        return (-1);
    }

    /* Clear the timestamp */
    vtocbuf.timestamp[partno] = 0;

    if (meta_getvtoc(fd, np->cname, &vtocbuf, &partno, ep) == -1) {
        (void) close(fd);
        return (-1);
    }

    (void) close(fd);   /* sd/ssd bug */

    if (*stamp != vtocbuf.timestamp[partno])
        return (mddeverror(ep, MDE_CANTVERIFY_VTOC, NODEV64,
            np->cname));

    return (0);
}