usr/src/cmd/devfsadm/lofi_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 2016 Toomas Soome <tsoome@me.com>
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <regex.h>
  28 #include <devfsadm.h>
  29 #include <stdio.h>
  30 #include <strings.h>
  31 #include <stdlib.h>
  32 #include <limits.h>
  33 #include <sys/mkdev.h>
  34 #include <sys/lofi.h>
  35
  36
  37 static int lofi(di_minor_t minor, di_node_t node);
  38 static int lofi_rm_all(char *link);
  39
  40 /*
  41  * devfs create callback register
  42  */
  43 static devfsadm_create_t lofi_create_cbt[] = {
  44         { "pseudo", "ddi_pseudo", LOFI_DRIVER_NAME,
  45             TYPE_EXACT | DRV_EXACT, ILEVEL_0, lofi,
  46         },
  47 };
  48 DEVFSADM_CREATE_INIT_V0(lofi_create_cbt);
  49
  50 /*
  51  * devfs cleanup register
  52  */
  53 static devfsadm_remove_V1_t lofi_remove_cbt[] = {
  54         {"pseudo", "^r?lofi/[0-9]+$", RM_ALWAYS | RM_PRE | RM_HOT,
  55             ILEVEL_0, lofi_rm_all},
  56 };
  57 DEVFSADM_REMOVE_INIT_V1(lofi_remove_cbt);
  58
  59 /*
  60  * Wrapper around devfsadm_rm_all() that allows termination of remove
  61  * process
  62  */
  63 static int
  64 lofi_rm_all(char *link)
  65 {
  66         devfsadm_rm_all(link);
  67         return (DEVFSADM_TERMINATE);
  68 }
  69
  70
  71 /*
  72  * For the master device:
  73  *      /dev/lofictl -> /devices/pseudo/lofi@0:ctl
  74  * For each other device
  75  *      /dev/lofi/1 -> /devices/pseudo/lofi@1:disk
  76  *      /dev/rlofi/1 -> /devices/pseudo/lofi@1:disk,raw
  77  */
  78 static int
  79 lofi(di_minor_t minor, di_node_t node)
  80 {
  81         int instance;
  82         char mn[MAXNAMELEN + 1];
  83         char path[PATH_MAX + 1];
  84
  85         (void) strcpy(mn, di_minor_name(minor));
  86
  87         if (strcmp(mn, "ctl") == 0) {
  88                 (void) devfsadm_mklink(LOFI_CTL_NAME, node, minor, 0);
  89         } else {
  90                 instance = di_instance(node);
  91
  92                 if (strcmp(mn, LOFI_BLOCK_NODE) == 0) {
  93                         (void) snprintf(path, sizeof (path), "%s/%d",
  94                             LOFI_BLOCK_NAME, instance);
  95                 } else if (strcmp(mn, LOFI_CHAR_NODE) == 0) {
  96                         (void) snprintf(path, sizeof (path), "%s/%d",
  97                             LOFI_CHAR_NAME, instance);
  98                 } else {
  99                         return (DEVFSADM_CONTINUE);
 100                 }
 101
 102                 (void) devfsadm_mklink(path, node, minor, 0);
 103         }
 104         return (DEVFSADM_CONTINUE);
 105 }