usr/src/cmd/devfsadm/zfs_link.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <regex.h>
  27 #include <devfsadm.h>
  28 #include <stdio.h>
  29 #include <strings.h>
  30 #include <stdlib.h>
  31 #include <limits.h>
  32 #include <sys/mkdev.h>
  33 #include <sys/fs/zfs.h>
  34
  35 /* zfs name info */
  36
  37 static int zfs(di_minor_t minor, di_node_t node);
  38
  39 /*
  40  * devfs create callback register
  41  */
  42 static devfsadm_create_t zfs_create_cbt[] = {
  43         { "pseudo", "ddi_pseudo", ZFS_DRIVER,
  44             TYPE_EXACT | DRV_EXACT, ILEVEL_0, zfs,
  45         },
  46 };
  47 DEVFSADM_CREATE_INIT_V0(zfs_create_cbt);
  48
  49 /*
  50  * The zfs control node looks like this:
  51  *      /dev/zfs -> /devices/pseudo/zfs@0:zfs
  52  */
  53 static int
  54 zfs(di_minor_t minor, di_node_t node)
  55 {
  56         char mn[MAXNAMELEN + 1];
  57
  58         (void) strcpy(mn, di_minor_name(minor));
  59
  60         if (strcmp(mn, ZFS_DRIVER) == 0) {
  61                 (void) devfsadm_mklink(ZFS_DRIVER, node, minor, 0);
  62         }
  63         return (DEVFSADM_CONTINUE);
  64 }