xref: /netbsd-src/sys/miscfs/genfs/genfs_vfsops.c (revision 4ad9c3956ab823b7bcf4015a1e088bb1c1e811c5)
1 /*	$NetBSD: genfs_vfsops.c,v 1.11 2022/07/08 07:42:06 hannken Exp $	*/
2 
3 /*-
4  * Copyright (c) 2008, 2009, 2019 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  * POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: genfs_vfsops.c,v 1.11 2022/07/08 07:42:06 hannken Exp $");
31 
32 #include <sys/types.h>
33 #include <sys/mount.h>
34 #include <sys/fstrans.h>
35 #include <sys/statvfs.h>
36 #include <sys/vnode.h>
37 
38 #include <miscfs/genfs/genfs.h>
39 #include <miscfs/genfs/genfs_node.h>
40 
41 int
genfs_statvfs(struct mount * mp,struct statvfs * sbp)42 genfs_statvfs(struct mount *mp, struct statvfs *sbp)
43 {
44 
45 	sbp->f_bsize = DEV_BSIZE;
46 	sbp->f_frsize = DEV_BSIZE;
47 	sbp->f_iosize = DEV_BSIZE;
48 	sbp->f_blocks = 2;		/* 1k to keep df happy */
49 	sbp->f_bfree = 0;
50 	sbp->f_bavail = 0;
51 	sbp->f_bresvd = 0;
52 	sbp->f_files = 0;
53 	sbp->f_ffree = 0;
54 	sbp->f_favail = 0;
55 	sbp->f_fresvd = 0;
56 	copy_statvfs_info(sbp, mp);
57 
58 	return 0;
59 }
60 
61 int
genfs_renamelock_enter(struct mount * mp)62 genfs_renamelock_enter(struct mount *mp)
63 {
64 	mutex_enter(mp->mnt_renamelock);
65 	/* Preserve possible error return in case we become interruptible. */
66 	return 0;
67 }
68 
69 void
genfs_renamelock_exit(struct mount * mp)70 genfs_renamelock_exit(struct mount *mp)
71 {
72 	mutex_exit(mp->mnt_renamelock);
73 }
74 
75 int
genfs_suspendctl(struct mount * mp,int cmd)76 genfs_suspendctl(struct mount *mp, int cmd)
77 {
78 	int error;
79 
80 	switch (cmd) {
81 	case SUSPEND_SUSPEND:
82 		error = fstrans_setstate(mp, FSTRANS_SUSPENDING);
83 		if (error)
84 			return error;
85 		error = fstrans_setstate(mp, FSTRANS_SUSPENDED);
86 		return error;
87 
88 	case SUSPEND_RESUME:
89 		error = fstrans_setstate(mp, FSTRANS_NORMAL);
90 		KASSERT(error == 0);
91 		return 0;
92 
93 	default:
94 		panic("%s: bogus command %d", __func__, cmd);
95 	}
96 }
97