usr/src/cmd/devfsadm/ramdisk_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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <regex.h>
  30 #include <devfsadm.h>
  31 #include <stdio.h>
  32 #include <strings.h>
  33 #include <stdlib.h>
  34 #include <limits.h>
  35 #include <sys/stat.h>
  36 #include <sys/mkdev.h>
  37 #include <sys/ramdisk.h>
  38
  39 static int ramdisk(di_minor_t di_minor, di_node_t node);
  40
  41 /*
  42  * devfs create callback register
  43  */
  44 static devfsadm_create_t ramdisk_create_cbt[] = {
  45         { "pseudo", "ddi_pseudo", RD_DRIVER_NAME,
  46             TYPE_EXACT | DRV_EXACT, ILEVEL_0, ramdisk,
  47         },
  48 };
  49 DEVFSADM_CREATE_INIT_V0(ramdisk_create_cbt);
  50
  51 /*
  52  * devfs cleanup register
  53  */
  54 #define RAMDISK_LINK_RE "^r?ramdisk/.+$"
  55
  56 static devfsadm_remove_t ramdisk_remove_cbt[] = {
  57         { "pseudo", RAMDISK_LINK_RE, RM_ALWAYS | RM_PRE | RM_HOT,
  58             ILEVEL_0, devfsadm_rm_all},
  59 };
  60 DEVFSADM_REMOVE_INIT_V0(ramdisk_remove_cbt);
  61
  62 static char *debug_mid = "ramdisk_mid";
  63
  64 int
  65 minor_init(void)
  66 {
  67         devfsadm_print(debug_mid, "ramdisk_link: minor_init\n");
  68         return (DEVFSADM_SUCCESS);
  69 }
  70
  71 int
  72 minor_fini(void)
  73 {
  74         devfsadm_print(debug_mid, "ramdisk_link: minor_fini\n");
  75         return (DEVFSADM_SUCCESS);
  76 }
  77
  78 /*
  79  * This function is called for every ramdisk minor node.
  80  * Calls enumerate to assign a logical ramdisk id, and then
  81  * devfsadm_mklink to make the link.
  82  *
  83  * For pseudo ramdisk devices:
  84  *
  85  *      /dev/ramdiskctl      -> /devices/pseudo/ramdisk@0:ctl
  86  *      /dev/ramdisk/<name>  -> /devices/pseudo/ramdisk@0:<name>
  87  *      /dev/rramdisk/<name> -> /devices/pseudo/ramdisk@0:<name>,raw
  88  *
  89  * For OBP-created ramdisk devices:
  90  *
  91  *      /dev/ramdisk/<name>  -> /devices/ramdisk-<name>:a
  92  *      /dev/rramdisk/<name> -> /devices/ramdisk-<name>:a,raw
  93  */
  94 static int
  95 ramdisk(di_minor_t di_minor, di_node_t node)
  96 {
  97         char    *name;
  98         char    devnm[MAXNAMELEN + 1];
  99         char    path[PATH_MAX];
 100
 101         /*
 102          * If this is an OBP-created ramdisk use the node name, having first
 103          * stripped the "ramdisk-" prefix.  For pseudo ramdisks use the minor
 104          * name, having first stripped any ",raw" suffix.
 105          */
 106         if (di_nodeid(node) == DI_PROM_NODEID) {
 107                 RD_STRIP_PREFIX(name, di_node_name(node));
 108                 (void) strlcpy(devnm, name, sizeof (devnm));
 109         } else {
 110                 (void) strlcpy(devnm, di_minor_name(di_minor), sizeof (devnm));
 111                 RD_STRIP_SUFFIX(devnm);
 112         }
 113
 114         if (strcmp(devnm, RD_CTL_NODE) == 0) {
 115                 (void) devfsadm_mklink(RD_CTL_NAME, node, di_minor, 0);
 116         } else {
 117                 /*
 118                  * Make the link in /dev/ramdisk or /dev/rramdisk.
 119                  */
 120                 (void) snprintf(path, sizeof (path), "%s/%s",
 121                     di_minor_spectype(di_minor) == S_IFBLK ?
 122                     RD_BLOCK_NAME : RD_CHAR_NAME, devnm);
 123                 (void) devfsadm_mklink(path, node, di_minor, 0);
 124         }
 125
 126         return (DEVFSADM_CONTINUE);
 127 }