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 (c) 2000-2001 by Sun Microsystems, Inc.
24  * All rights reserved.
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/fssnap_if.h>
36 
37 
38 static int fssnap(di_minor_t minor, di_node_t node);
39 
40 static devfsadm_create_t fssnap_cbt[] = {
41 	{ "pseudo", "ddi_pseudo", SNAP_NAME,
42 	    TYPE_EXACT | DRV_EXACT, ILEVEL_0, fssnap,
43 	},
44 };
45 
46 DEVFSADM_CREATE_INIT_V0(fssnap_cbt);
47 
48 /*
49  * For the master device:
50  *	/dev/fssnapctl -> /devices/pseudo/fssnap@0:ctl
51  * For each other device
52  *	/dev/fssnap/1 -> /devices/pseudo/fssnap@0:1
53  *	/dev/rfssnap/1 -> /devices/pseudo/fssnap@0:1,raw
54  */
55 static int
fssnap(di_minor_t minor,di_node_t node)56 fssnap(di_minor_t minor, di_node_t node)
57 {
58 	dev_t	dev;
59 	char mn[MAXNAMELEN + 1];
60 	char blkname[MAXNAMELEN + 1];
61 	char rawname[MAXNAMELEN + 1];
62 	char path[PATH_MAX + 1];
63 
64 	(void) strcpy(mn, di_minor_name(minor));
65 
66 	if (strcmp(mn, "ctl") == 0) {
67 		(void) devfsadm_mklink(SNAP_CTL_NAME, node, minor, 0);
68 	} else {
69 		dev = di_minor_devt(minor);
70 		(void) snprintf(blkname, sizeof (blkname), "%d",
71 		    (int)minor(dev));
72 		(void) snprintf(rawname, sizeof (rawname), "%d,raw",
73 		    (int)minor(dev));
74 
75 		if (strcmp(mn, blkname) == 0) {
76 			(void) snprintf(path, sizeof (path), "%s/%s",
77 			    SNAP_BLOCK_NAME, blkname);
78 		} else if (strcmp(mn, rawname) == 0) {
79 			(void) snprintf(path, sizeof (path), "%s/%s",
80 			    SNAP_CHAR_NAME, blkname);
81 		} else {
82 			return (DEVFSADM_CONTINUE);
83 		}
84 
85 		(void) devfsadm_mklink(path, node, minor, 0);
86 	}
87 	return (DEVFSADM_CONTINUE);
88 }
89