xref: /netbsd-src/sys/rump/fs/lib/libzfs/zfs_component.c (revision 8c4b1be312f54cf46d18ea6037aa8362cc5576cc)
1 /*	$NetBSD: zfs_component.c,v 1.3 2019/05/07 08:51:09 hannken Exp $	*/
2 
3 /*
4  * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: zfs_component.c,v 1.3 2019/05/07 08:51:09 hannken Exp $");
30 
31 #include <sys/param.h>
32 #include <sys/conf.h>
33 #include <sys/device.h>
34 #include <sys/stat.h>
35 
36 #include <rump-sys/kern.h>
37 #include <rump-sys/vfs.h>
38 
RUMP_COMPONENT(RUMP_COMPONENT_VFS)39 RUMP_COMPONENT(RUMP_COMPONENT_VFS)
40 {
41 	extern const struct bdevsw zfs_bdevsw;
42 	extern const struct cdevsw zfs_cdevsw;
43 	devmajor_t bmaj, cmaj;
44 	int error, exist;
45 
46 	/* go, mydevfs */
47 	bmaj = cmaj = -1;
48 
49 	if ((error = devsw_attach("zfs", &zfs_bdevsw, &bmaj,
50 	    &zfs_cdevsw, &cmaj)) != 0 && error != EEXIST)
51 		panic("cannot attach zfs: %d", error);
52 	exist = (error == EEXIST);
53 
54 	if ((error = rump_vfs_makeonedevnode(S_IFCHR,
55 	    "/dev/zfs", cmaj, 0)) != 0)
56 		panic("cannot create zfs dev nodes: %d", error);
57 
58 	if (!exist)
59 		devsw_detach(&zfs_bdevsw, &zfs_cdevsw);
60 }
61