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
minor_init(void)65 minor_init(void)
66 {
67 devfsadm_print(debug_mid, "ramdisk_link: minor_init\n");
68 return (DEVFSADM_SUCCESS);
69 }
70
71 int
minor_fini(void)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
ramdisk(di_minor_t di_minor,di_node_t node)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 }
128