cmd/devfsadm/lofi_link.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 2016 Toomas Soome <tsoome@me.com>
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <regex.h>
#include <devfsadm.h>
#include <stdio.h>
#include <strings.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/mkdev.h>
#include <sys/lofi.h>


static int lofi(di_minor_t minor, di_node_t node);
static int lofi_rm_all(char *link);

/*
 * devfs create callback register
 */
static devfsadm_create_t lofi_create_cbt[] = {
    { "pseudo", "ddi_pseudo", LOFI_DRIVER_NAME,
        TYPE_EXACT | DRV_EXACT, ILEVEL_0, lofi,
    },
};
DEVFSADM_CREATE_INIT_V0(lofi_create_cbt);

/*
 * devfs cleanup register
 */
static devfsadm_remove_V1_t lofi_remove_cbt[] = {
    {"pseudo", "^r?lofi/[0-9]+$", RM_ALWAYS | RM_PRE | RM_HOT,
        ILEVEL_0, lofi_rm_all},
};
DEVFSADM_REMOVE_INIT_V1(lofi_remove_cbt);

/*
 * Wrapper around devfsadm_rm_all() that allows termination of remove
 * process
 */
static int
lofi_rm_all(char *link)
{
    devfsadm_rm_all(link);
    return (DEVFSADM_TERMINATE);
}


/*
 * For the master device:
 *  /dev/lofictl -> /devices/pseudo/lofi@0:ctl
 * For each other device
 *  /dev/lofi/1 -> /devices/pseudo/lofi@1:disk
 *  /dev/rlofi/1 -> /devices/pseudo/lofi@1:disk,raw
 */
static int
lofi(di_minor_t minor, di_node_t node)
{
    int instance;
    char mn[MAXNAMELEN + 1];
    char path[PATH_MAX + 1];

    (void) strcpy(mn, di_minor_name(minor));

    if (strcmp(mn, "ctl") == 0) {
        (void) devfsadm_mklink(LOFI_CTL_NAME, node, minor, 0);
    } else {
        instance = di_instance(node);

        if (strcmp(mn, LOFI_BLOCK_NODE) == 0) {
            (void) snprintf(path, sizeof (path), "%s/%d",
                LOFI_BLOCK_NAME, instance);
        } else if (strcmp(mn, LOFI_CHAR_NODE) == 0) {
            (void) snprintf(path, sizeof (path), "%s/%d",
                LOFI_CHAR_NAME, instance);
        } else {
            return (DEVFSADM_CONTINUE);
        }

        (void) devfsadm_mklink(path, node, minor, 0);
    }
    return (DEVFSADM_CONTINUE);
}