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 2008 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 * minor_fini - module cleanup routine
79 */
80 int
minor_fini(void)81 minor_fini(void)
82 {
83 metarpccloseall();
84 return (DEVFSADM_SUCCESS);
85 }
86
87 /*
88 * For the admin device:
89 * /dev/md/admin -> /devices/pseudo/md@0:admin
90 *
91 * For metadevice:
92 * /dev/md/dsk/foobar --> /devices/pseudo/md@0:0,100,blk
93 * /dev/md/rdsk/foobar --> /devices/pseudo/md@0:0,100,raw
94 *
95 * Where 'foobar' is user specified arbitrary name and '100'
96 * is the minor number returned by MD_IOCMAKE_DEV ioctl
97 *
98 */
99 static int
md_create(di_minor_t minor,di_node_t node)100 md_create(di_minor_t minor, di_node_t node)
101 {
102 char mn[MAXNAMELEN + 1];
103 char path[PATH_MAX + 1];
104 char set_path[PATH_MAX +1];
105 char sym_path[PATH_MAX + 1];
106 int set = -1, ret;
107 char *type, *dir;
108 char *device_name;
109 dev_t minor_devt = di_minor_devt(minor);
110 int key;
111 mdsetname_t *sp = NULL;
112 md_error_t ep;
113
114 /*
115 * Initialize sdssc entry points. Don't worry about the return
116 * value here since the interface functions will get initialized
117 * correctly regardless.
118 */
119 (void) sdssc_bind_library();
120
121 (void) strcpy(mn, di_minor_name(minor));
122
123 /*
124 * Check whether we are being requested to setup the admin
125 * device link or one of the metadevice links. They need
126 * to be treated differently.
127 */
128
129 if (strcmp(mn, "admin") == 0) {
130 /* there is only one admin link and always in /dev/md/admin */
131 (void) devfsadm_mklink("md/admin", node, minor, 0);
132 } else {
133 /*
134 * Extract out the minor components and create the
135 * appropriate links. The node looks like:
136 * md@<set>,<mdev>,<type>
137 * where the <set> number is the named diskset,
138 * <mdev> is the metadevice number, and <type>
139 * is the trailing "blk" or "raw" indication.
140 *
141 * NOTE: when <set> is non-zero, we need to create
142 * under the "shared" directory entry instead of linking
143 * into the top level dsk/rdsk directories.
144 */
145 ret = sscanf(mn, "%d,", &set);
146 if (ret == 1 && (type = strrchr(mn, ',')) != NULL) {
147 type++;
148 if (strcmp(type, "blk") == 0) {
149 dir = "dsk";
150 } else {
151 dir = "rdsk";
152 }
153
154 (void) memset(&ep, '\0', sizeof (ep));
155 if ((device_name = meta_getnmentbydev(set,
156 MD_SIDEWILD, minor_devt, NULL, NULL,
157 &key, &ep)) == NULL) {
158 (void) close_admin(&ep);
159 return (DEVFSADM_CONTINUE);
160 }
161
162 if (set == 0) {
163 /* this is a simple md */
164 (void) snprintf(path, sizeof (path),
165 "md/%s/%s", dir, basename(device_name));
166 } else {
167 /* this is a shared md */
168 (void) snprintf(path, sizeof (path),
169 "md/shared/%d/%s/%s", set, dir,
170 basename(device_name));
171
172 /*
173 * flush the caches so the next call to
174 * metasetnosetname will get us the
175 * updated cache.
176 */
177 metaflushnames(0);
178 if ((sp = metasetnosetname(set, &ep))
179 != NULL) {
180 (void) snprintf(set_path,
181 sizeof (set_path), "md/shared/%d",
182 sp->setno);
183 (void) snprintf(sym_path,
184 sizeof (sym_path), "md/%s",
185 sp->setname);
186 }
187 }
188 (void) devfsadm_mklink(path, node, minor, 0);
189 Free(device_name);
190
191 if (sp != NULL) {
192 (void) devfsadm_secondary_link(sym_path,
193 set_path, 0);
194 }
195 }
196 }
197
198 (void) close_admin(&ep);
199 return (DEVFSADM_CONTINUE);
200 }
201