avs/sdbc/sdbc_ioctl.c

/*
 * 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.
 */

/*
 * SDBC user level ioctl interface
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <strings.h>

#include <sys/nsctl/sd_cache.h>
#include <sys/nsctl/sd_conf.h>
#include <sys/nsctl/sdbc_ioctl.h>
#include <sys/unistat/spcs_s.h>
#include <sys/unistat/spcs_s_u.h>

#include <sys/nsctl/sv.h>
#include <sys/nsctl/sv_impl.h>


const char *__sdbc_dev = "/dev/sdbc";
static int __sdbc_fd;


static int
__sdbc_open(void)
{
    int fd;

    fd = open("/dev/nsctl", O_RDONLY);
    if (fd >= 0)
        (void) close(fd);

    fd = open(__sdbc_dev, O_RDONLY);
    if (fd < 0)
        return (-1);

    return (__sdbc_fd = fd);
}


static void
sv_list()
{
    sv_name_t svn[1];
    sv_name_t *svn_system;
    sv_list_t svl;
    static int fd = -1;

    if (fd < 0)
        fd = open(SV_DEVICE, O_RDONLY);
    if (fd < 0)
        return;

    bzero(&svl, sizeof (svl));
    bzero(&svn[0], sizeof (svn));

    svl.svl_names = &svn[0];
    svl.svl_error = spcs_s_ucreate();

    if (ioctl(fd, SVIOC_LIST, &svl) < 0)
        return;

    svn_system = calloc(svl.svl_maxdevs, sizeof (*svn));
    if (svn_system == NULL)
        return;

    /* Grab the system list from the driver */
    svl.svl_count = svl.svl_maxdevs;
    svl.svl_names = svn_system;

    (void) ioctl(fd, SVIOC_LIST, &svl);

    free(svn_system);
    spcs_s_ufree(&svl.svl_error);
}


int
sdbc_ioctl(long cmd, long a0, long a1, long a2, long a3, long a4,
    spcs_s_info_t *ustatus)
{
    _sdbc_ioctl_t args;
    int rc;

    *ustatus = NULL;

    if (!__sdbc_fd && __sdbc_open() < 0)
        return (-1);

    switch (cmd) {
    /*
     * These ioctls work on open cache descriptors. The sv_list() function
     * has the side-effect of re-opening all configured descriptors.
     * Without this call, devices seem to "disappear" from the system when
     * certain reconfiguration operations, for example II or SNDR disable,
     * are done.
     * It does rely on SV being configured, so in an STE-only environment
     * the disappearing will still seem to happen.
     */
    case SDBC_SET_CD_HINT:
    case SDBC_GET_CD_HINT:
    case SDBC_STATS:
    case SDBC_GET_CD_BLK:
    case SDBC_INJ_IOERR:
    case SDBC_CLR_IOERR:
        sv_list();
        break;

    default:
        break;
    }

    args.arg0 = a0;
    args.arg1 = a1;
    args.arg2 = a2;
    args.arg3 = a3;
    args.arg4 = a4;
    args.magic = _SD_MAGIC; /* for versioning */
    args.sdbc_ustatus = spcs_s_ucreate();

    if ((rc = ioctl(__sdbc_fd, cmd, &args)) < 0) {
        *ustatus = args.sdbc_ustatus;
    } else {
        spcs_s_ufree(&args.sdbc_ustatus);
        *ustatus = NULL;
    }

    return (rc);
}