libmeta/common/meta_raid_resync.c

/*
 * 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 1994-2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * raid operations
 */

#include <meta.h>
#include <sys/lvm/md_mirror.h>

/*
 * resync raid
 */
int
meta_raid_resync(
    mdsetname_t     *sp,
    mdname_t        *raidnp,
    daddr_t         size,
    md_error_t      *ep
)
{
    char            *miscname;
    md_resync_ioctl_t   ri;

    /* should have a set */
    assert(sp != NULL);
    assert(sp->setno == MD_MIN2SET(meta_getminor(raidnp->dev)));

    /* make sure we have a raid */
    if ((miscname = metagetmiscname(raidnp, ep)) == NULL)
        return (-1);
    if (strcmp(miscname, MD_RAID) != 0) {
        return (mdmderror(ep, MDE_NOT_RAID, meta_getminor(raidnp->dev),
            raidnp->cname));
    }

    /* start resync */
    (void) memset(&ri, 0, sizeof (ri));
    MD_SETDRIVERNAME(&ri, MD_RAID, sp->setno);
    ri.ri_mnum = meta_getminor(raidnp->dev);
    ri.ri_copysize = size;
    if (metaioctl(MD_IOCSETSYNC, &ri, &ri.mde, raidnp->cname) != 0)
        return (mdstealerror(ep, &ri.mde));

    /* return success */
    return (0);
}

/*
 * NAME:    meta_raid_resync_all
 * DESCRIPTION: loop through the RAID devices synch'ing all
 * PARAMETERS:  char        *sp - the set to synch
 *      daddr_t     size    - resync size
 *      md_error_t  *ep - return error info
 *
 */
int
meta_raid_resync_all(
    mdsetname_t *sp,
    daddr_t     size,
    md_error_t  *ep
)
{
    mdnamelist_t    *nlp = NULL;
    mdnamelist_t    *p;
    int     rval = 0, fval;

    /* should have a set */
    assert(sp != NULL);

    /* get raids */
    if (meta_get_raid_names(sp, &nlp, 0, ep) < 0)
        return (-1);

    /* fork a process */
    if ((fval = md_daemonize(sp, ep)) != 0) {
        /*
         * md_daemonize forks off a process to do the work.  This
         * is the parent or errror.
         */
        if (fval > 0) {
            if (nlp != NULL)
                metafreenamelist(nlp);
            return (0);
        }
        mdclrerror(ep);
    }

    assert((fval == 0) || (fval == -1));

    /* resync each raid */
    for (p = nlp; (p != NULL); p = p->next) {
        mdname_t    *raidnp = p->namep;

        if (meta_raid_resync(sp, raidnp, size, ep) != 0)
            rval = -1;
    }

    /* cleanup, return success */
    if (nlp != NULL)
        metafreenamelist(nlp);
    if (fval == 0)
        exit(0);
    return (rval);
}