libdiskmgt/common/alias.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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <fcntl.h>
#include <libdevinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/dkio.h>
#include <sys/sunddi.h>
#include <sys/types.h>
#include <unistd.h>

#include "libdiskmgt.h"
#include "disks_private.h"

static int      get_status(disk_t *diskp, int fd, nvlist_t *attrs);

descriptor_t **
alias_get_assoc_descriptors(descriptor_t *desc, dm_desc_type_t type,
    int *errp)
{
    switch (type) {
    case DM_DRIVE:
        return (drive_get_assocs(desc, errp));
    }

    *errp = EINVAL;
    return (NULL);
}

nvlist_t *
alias_get_attributes(descriptor_t *dp, int *errp)
{
    alias_t     *ap;
    nvlist_t    *attrs = NULL;

    /* Find the alias for this descriptor */

    *errp = ENODEV;
    for (ap = dp->p.disk->aliases; ap != NULL; ap = ap->next) {
        if (libdiskmgt_str_eq(dp->name, ap->alias)) {
        /* we found the alias for this descriptor */

        if (nvlist_alloc(&attrs, NVATTRS, 0) != 0) {
            *errp = ENOMEM;
            return (NULL);
        }

        if (ap->target >= 0) {
            if (nvlist_add_uint32(attrs, DM_LUN, ap->lun) != 0) {
            nvlist_free(attrs);
            *errp = ENOMEM;
            return (NULL);
            }

            if (nvlist_add_uint32(attrs, DM_TARGET, ap->target) != 0) {
            nvlist_free(attrs);
            *errp = ENOMEM;
            return (NULL);
            }
        }

        if (ap->wwn != NULL) {
            if (nvlist_add_string(attrs, DM_WWN, ap->wwn) != 0) {
            nvlist_free(attrs);
            *errp = ENOMEM;
            return (NULL);
            }
        }

        if (ap->devpaths != NULL) {
            /* get the status for this alias */
            int     fd;

            fd = open(ap->devpaths->devpath, O_RDONLY|O_NDELAY);

            if ((*errp = get_status(dp->p.disk, fd, attrs)) != 0) {
            nvlist_free(attrs);
            attrs = NULL;
            }

            if (fd >= 0) {
            (void) close(fd);
            }
        }

        *errp = 0;
        break;
        }
    }

    return (attrs);
}

descriptor_t *
alias_get_descriptor_by_name(char *name, int *errp)
{
    descriptor_t    **aliases;
    int     i;
    descriptor_t    *alias = NULL;

    aliases = cache_get_descriptors(DM_ALIAS, errp);
    if (*errp != 0) {
        return (NULL);
    }

    for (i = 0; aliases[i]; i++) {
        if (libdiskmgt_str_eq(name, aliases[i]->name)) {
        alias = aliases[i];
        } else {
        /* clean up the unused descriptors */
        cache_free_descriptor(aliases[i]);
        }
    }
    free(aliases);

    if (alias == NULL) {
        *errp = ENODEV;
    }

    return (alias);
}

/* ARGSUSED */
descriptor_t **
alias_get_descriptors(int filter[], int *errp)
{
    return (cache_get_descriptors(DM_ALIAS, errp));
}

char *
alias_get_name(descriptor_t *desc)
{
    return (desc->name);
}

/* ARGSUSED */
nvlist_t *
alias_get_stats(descriptor_t *dp, int stat_type, int *errp)
{
    /* There are no stat types defined for aliases */
    *errp = EINVAL;
    return (NULL);
}

int
alias_make_descriptors()
{
    int     error;
    disk_t      *dp;

    dp = cache_get_disklist();
    while (dp != NULL) {
        alias_t *ap;

        ap = dp->aliases;
        while (ap != NULL) {
        if (ap->alias != NULL) {
            cache_load_desc(DM_ALIAS, dp, ap->alias, NULL, &error);
            if (error != 0) {
            return (error);
            }
        }
        ap = ap->next;
        }
        dp = dp->next;
    }

    return (0);
}

static int
get_status(disk_t *diskp, int fd, nvlist_t *attrs)
{
    struct dk_minfo minfo;

    /* Make sure media is inserted and spun up. */
    if (fd >= 0 && media_read_info(fd, &minfo)) {

        if (nvlist_add_uint32(attrs, DM_STATUS, DM_DISK_UP) != 0) {
        return (ENOMEM);
        }

    } else {
        /* Not ready, so either no media or dead. */

        if (diskp->removable) {
        /* This is a removable drive with no media. */
        if (nvlist_add_uint32(attrs, DM_STATUS, DM_DISK_UP) != 0) {
            return (ENOMEM);
        }
        } else {
        /* not removable, so must be dead */
        if (nvlist_add_uint32(attrs, DM_STATUS, DM_DISK_DOWN) != 0) {
            return (ENOMEM);
        }
        }
    }

    return (0);
}