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 #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/stat.h>
34 #include <sys/mkdev.h>
35 #include <sys/ramdisk.h>
36
37 static int ramdisk(di_minor_t di_minor, di_node_t node);
38
39 /*
40 * devfs create callback register
41 */
42 static devfsadm_create_t ramdisk_create_cbt[] = {
43 { "pseudo", "ddi_pseudo", RD_DRIVER_NAME,
44 TYPE_EXACT | DRV_EXACT, ILEVEL_0, ramdisk,
45 },
46 };
47 DEVFSADM_CREATE_INIT_V0(ramdisk_create_cbt);
48
49 /*
50 * devfs cleanup register
51 */
52 #define RAMDISK_LINK_RE "^r?ramdisk/.+$"
53
54 static devfsadm_remove_t ramdisk_remove_cbt[] = {
55 { "pseudo", RAMDISK_LINK_RE, RM_ALWAYS | RM_PRE | RM_HOT,
56 ILEVEL_0, devfsadm_rm_all},
57 };
58 DEVFSADM_REMOVE_INIT_V0(ramdisk_remove_cbt);
59
60 static char *debug_mid = "ramdisk_mid";
61
62 int
minor_init(void)63 minor_init(void)
64 {
65 devfsadm_print(debug_mid, "ramdisk_link: minor_init\n");
66 return (DEVFSADM_SUCCESS);
67 }
68
69 int
minor_fini(void)70 minor_fini(void)
71 {
72 devfsadm_print(debug_mid, "ramdisk_link: minor_fini\n");
73 return (DEVFSADM_SUCCESS);
74 }
75
76 /*
77 * This function is called for every ramdisk minor node.
78 * Calls enumerate to assign a logical ramdisk id, and then
79 * devfsadm_mklink to make the link.
80 *
81 * For pseudo ramdisk devices:
82 *
83 * /dev/ramdiskctl -> /devices/pseudo/ramdisk@0:ctl
84 * /dev/ramdisk/<name> -> /devices/pseudo/ramdisk@0:<name>
85 * /dev/rramdisk/<name> -> /devices/pseudo/ramdisk@0:<name>,raw
86 *
87 * For OBP-created ramdisk devices:
88 *
89 * /dev/ramdisk/<name> -> /devices/ramdisk-<name>:a
90 * /dev/rramdisk/<name> -> /devices/ramdisk-<name>:a,raw
91 */
92 static int
ramdisk(di_minor_t di_minor,di_node_t node)93 ramdisk(di_minor_t di_minor, di_node_t node)
94 {
95 char *name;
96 char devnm[MAXNAMELEN + 1];
97 char path[PATH_MAX];
98
99 /*
100 * If this is an OBP-created ramdisk use the node name, having first
101 * stripped the "ramdisk-" prefix. For pseudo ramdisks use the minor
102 * name, having first stripped any ",raw" suffix.
103 */
104 if (di_nodeid(node) == DI_PROM_NODEID) {
105 RD_STRIP_PREFIX(name, di_node_name(node));
106 (void) strlcpy(devnm, name, sizeof (devnm));
107 } else {
108 (void) strlcpy(devnm, di_minor_name(di_minor), sizeof (devnm));
109 RD_STRIP_SUFFIX(devnm);
110 }
111
112 if (strcmp(devnm, RD_CTL_NODE) == 0) {
113 (void) devfsadm_mklink(RD_CTL_NAME, node, di_minor, 0);
114 } else {
115 /*
116 * Make the link in /dev/ramdisk or /dev/rramdisk.
117 */
118 (void) snprintf(path, sizeof (path), "%s/%s",
119 di_minor_spectype(di_minor) == S_IFBLK ?
120 RD_BLOCK_NAME : RD_CHAR_NAME, devnm);
121 (void) devfsadm_mklink(path, node, di_minor, 0);
122 }
123
124 return (DEVFSADM_CONTINUE);
125 }
126