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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <meta.h> 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/mkdev.h> 36 #include <sdssc.h> 37 38 #define MD_LINK_RE_DEVICES "^md/r?dsk/.+$" 39 #define MD_LINK_RE_SHARED "^md/shared/[0-9]+/r?dsk/.+$" 40 #define MD_LINK_RE_ADMIN "^md/admin" 41 42 /* 43 * The devfsadm link module require the next section to 44 * be defined in order to know what and when to call functions 45 * in the module on device creation and removal. 46 */ 47 48 /* setup for device creation */ 49 50 static int md_create(di_minor_t minor, di_node_t node); 51 52 static devfsadm_create_t md_cbt[] = { 53 { "pseudo", "ddi_pseudo", "md", 54 TYPE_EXACT | DRV_EXACT, ILEVEL_0, md_create, 55 }, 56 }; 57 58 DEVFSADM_CREATE_INIT_V0(md_cbt); 59 60 /* 61 * remove devices - always allow disks to be dynamically removed. Only allow 62 * admin device to be removed at reboot. 63 */ 64 65 static devfsadm_remove_t md_remove_cbt[] = { 66 {"pseudo", MD_LINK_RE_DEVICES, RM_ALWAYS | RM_PRE | RM_HOT, 67 ILEVEL_0, devfsadm_rm_all}, 68 {"pseudo", MD_LINK_RE_SHARED, RM_ALWAYS | RM_PRE | RM_HOT, 69 ILEVEL_0, devfsadm_rm_all}, 70 {"pseudo", MD_LINK_RE_ADMIN, RM_ALWAYS | RM_PRE, 71 ILEVEL_0, devfsadm_rm_all}, 72 }; 73 74 DEVFSADM_REMOVE_INIT_V0(md_remove_cbt); 75 76 77 /* 78 * For the admin device: 79 * /dev/md/admin -> /devices/pseudo/md@0:admin 80 * 81 * For metadevice: 82 * /dev/md/dsk/foobar --> /devices/pseudo/md@0:0,100,blk 83 * /dev/md/rdsk/foobar --> /devices/pseudo/md@0:0,100,raw 84 * 85 * Where 'foobar' is user specified arbitrary name and '100' 86 * is the minor number returned by MD_IOCMAKE_DEV ioctl 87 * 88 */ 89 static int 90 md_create(di_minor_t minor, di_node_t node) 91 { 92 char mn[MAXNAMELEN + 1]; 93 char path[PATH_MAX + 1]; 94 char set_path[PATH_MAX +1]; 95 char sym_path[PATH_MAX + 1]; 96 int set = -1, ret; 97 char *type, *dir; 98 char *device_name; 99 dev_t minor_devt = di_minor_devt(minor); 100 int key; 101 mdsetname_t *sp = NULL; 102 md_error_t ep; 103 104 /* 105 * Initialize sdssc entry points. Don't worry about the return 106 * value here since the interface functions will get initialized 107 * correctly regardless. 108 */ 109 (void) sdssc_bind_library(); 110 111 (void) strcpy(mn, di_minor_name(minor)); 112 113 /* 114 * Check whether we are being requested to setup the admin 115 * device link or one of the metadevice links. They need 116 * to be treated differently. 117 */ 118 119 if (strcmp(mn, "admin") == 0) { 120 /* there is only one admin link and always in /dev/md/admin */ 121 (void) devfsadm_mklink("md/admin", node, minor, 0); 122 } else { 123 /* 124 * Extract out the minor components and create the 125 * appropriate links. The node looks like: 126 * md@<set>,<mdev>,<type> 127 * where the <set> number is the named diskset, 128 * <mdev> is the metadevice number, and <type> 129 * is the trailing "blk" or "raw" indication. 130 * 131 * NOTE: when <set> is non-zero, we need to create 132 * under the "shared" directory entry instead of linking 133 * into the top level dsk/rdsk directories. 134 */ 135 ret = sscanf(mn, "%d,", &set); 136 if (ret == 1 && (type = strrchr(mn, ',')) != NULL) { 137 type++; 138 if (strcmp(type, "blk") == 0) { 139 dir = "dsk"; 140 } else { 141 dir = "rdsk"; 142 } 143 144 (void) memset(&ep, '\0', sizeof (ep)); 145 if ((device_name = meta_getnmentbydev(set, 146 MD_SIDEWILD, minor_devt, NULL, NULL, 147 &key, &ep)) == NULL) { 148 (void) close_admin(&ep); 149 return (DEVFSADM_CONTINUE); 150 } 151 152 if (set == 0) { 153 /* this is a simple md */ 154 (void) snprintf(path, sizeof (path), 155 "md/%s/%s", dir, basename(device_name)); 156 } else { 157 /* this is a shared md */ 158 (void) snprintf(path, sizeof (path), 159 "md/shared/%d/%s/%s", set, dir, 160 basename(device_name)); 161 162 /* 163 * flush the caches so the next call to 164 * metasetnosetname will get us the 165 * updated cache. 166 */ 167 metaflushnames(0); 168 if ((sp = metasetnosetname(set, &ep)) 169 != NULL) { 170 (void) snprintf(set_path, 171 sizeof (set_path), "md/shared/%d", 172 sp->setno); 173 (void) snprintf(sym_path, 174 sizeof (sym_path), "md/%s", 175 sp->setname); 176 } 177 } 178 (void) devfsadm_mklink(path, node, minor, 0); 179 Free(device_name); 180 181 if (sp != NULL) { 182 (void) devfsadm_secondary_link(sym_path, 183 set_path, 0); 184 } 185 } 186 } 187 188 (void) close_admin(&ep); 189 return (DEVFSADM_CONTINUE); 190 } 191