xref: /freebsd/sys/fs/tmpfs/tmpfs_fifoops.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*	$NetBSD: tmpfs_fifoops.c,v 1.5 2005/12/11 12:24:29 christos Exp $	*/
2 
3 /*
4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9  * 2005 program.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  *    must display the following acknowledgement:
21  *        This product includes software developed by the NetBSD
22  *        Foundation, Inc. and its contributors.
23  * 4. Neither the name of The NetBSD Foundation nor the names of its
24  *    contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGE.
38  */
39 
40 /*
41  * tmpfs vnode interface for named pipes.
42  */
43 #include <sys/cdefs.h>
44  __FBSDID("$FreeBSD$");
45 
46 #include <sys/param.h>
47 #include <sys/filedesc.h>
48 #include <sys/proc.h>
49 #include <sys/vnode.h>
50 
51 #include <vm/vm.h>
52 #include <vm/vm_object.h>
53 
54 #include <fs/tmpfs/tmpfs.h>
55 #include <fs/tmpfs/tmpfs_fifoops.h>
56 #include <fs/tmpfs/tmpfs_vnops.h>
57 
58 /* --------------------------------------------------------------------- */
59 
60 static int
61 tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
62 {
63 	struct vnode *vp;
64 	struct tmpfs_node *node;
65 
66 	vp = ap->a_vp;
67 	node = VP_TO_TMPFS_NODE(vp);
68 
69 	switch (ap->a_kn->kn_filter){
70 	case EVFILT_READ:
71 		node->tn_status |= TMPFS_NODE_ACCESSED;
72 		break;
73 	case EVFILT_WRITE:
74 		node->tn_status |= TMPFS_NODE_MODIFIED;
75 		break;
76 	}
77 
78 	return fifo_specops.vop_kqfilter(ap);
79 }
80 
81 /* --------------------------------------------------------------------- */
82 
83 static int
84 tmpfs_fifo_close(struct vop_close_args *v)
85 {
86 	struct tmpfs_node *node;
87 	node = VP_TO_TMPFS_NODE(v->a_vp);
88 	node->tn_status |= TMPFS_NODE_ACCESSED;
89 
90 	tmpfs_update(v->a_vp);
91 	return fifo_specops.vop_close(v);
92 }
93 
94 /*
95  * vnode operations vector used for fifos stored in a tmpfs file system.
96  */
97 struct vop_vector tmpfs_fifoop_entries = {
98 	.vop_default =			&fifo_specops,
99 	.vop_close =			tmpfs_fifo_close,
100 	.vop_reclaim =			tmpfs_reclaim,
101 	.vop_access =			tmpfs_access,
102 	.vop_getattr =			tmpfs_getattr,
103 	.vop_setattr =			tmpfs_setattr,
104 	.vop_kqfilter =			tmpfs_fifo_kqfilter,
105 };
106 
107