xref: /illumos-gate/usr/src/cmd/devfsadm/fssnap_link.c (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)
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 #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/fssnap_if.h>
34 
35 
36 static int fssnap(di_minor_t minor, di_node_t node);
37 
38 static devfsadm_create_t fssnap_cbt[] = {
39 	{ "pseudo", "ddi_pseudo", SNAP_NAME,
40 	    TYPE_EXACT | DRV_EXACT, ILEVEL_0, fssnap,
41 	},
42 };
43 
44 DEVFSADM_CREATE_INIT_V0(fssnap_cbt);
45 
46 /*
47  * For the master device:
48  *	/dev/fssnapctl -> /devices/pseudo/fssnap@0:ctl
49  * For each other device
50  *	/dev/fssnap/1 -> /devices/pseudo/fssnap@0:1
51  *	/dev/rfssnap/1 -> /devices/pseudo/fssnap@0:1,raw
52  */
53 static int
fssnap(di_minor_t minor,di_node_t node)54 fssnap(di_minor_t minor, di_node_t node)
55 {
56 	dev_t	dev;
57 	char mn[MAXNAMELEN + 1];
58 	char blkname[MAXNAMELEN + 1];
59 	char rawname[MAXNAMELEN + 1];
60 	char path[PATH_MAX + 1];
61 
62 	(void) strcpy(mn, di_minor_name(minor));
63 
64 	if (strcmp(mn, "ctl") == 0) {
65 		(void) devfsadm_mklink(SNAP_CTL_NAME, node, minor, 0);
66 	} else {
67 		dev = di_minor_devt(minor);
68 		(void) snprintf(blkname, sizeof (blkname), "%d",
69 		    (int)minor(dev));
70 		(void) snprintf(rawname, sizeof (rawname), "%d,raw",
71 		    (int)minor(dev));
72 
73 		if (strcmp(mn, blkname) == 0) {
74 			(void) snprintf(path, sizeof (path), "%s/%s",
75 			    SNAP_BLOCK_NAME, blkname);
76 		} else if (strcmp(mn, rawname) == 0) {
77 			(void) snprintf(path, sizeof (path), "%s/%s",
78 			    SNAP_CHAR_NAME, blkname);
79 		} else {
80 			return (DEVFSADM_CONTINUE);
81 		}
82 
83 		(void) devfsadm_mklink(path, node, minor, 0);
84 	}
85 	return (DEVFSADM_CONTINUE);
86 }
87