tmpfs_fifoops.c revision 170808 
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: head/sys/fs/tmpfs/tmpfs_fifoops.c 170808 2007-06-16 01:56:05Z delphij $");
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/*
61 * vnode operations vector used for fifos stored in a tmpfs file system.
62 */
63struct vop_vector tmpfs_fifoop_entries = {
64	.vop_default =			&fifo_specops,
65	.vop_close =			tmpfs_fifo_close,
66	.vop_reclaim =			tmpfs_reclaim,
67	.vop_access =			tmpfs_access,
68	.vop_getattr = 			tmpfs_getattr,
69	.vop_setattr = 			tmpfs_setattr,
70	.vop_kqfilter =			tmpfs_fifo_kqfilter,
71};
72
73
74int
75tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
76{
77	struct vnode *vp;
78	struct tmpfs_node *node;
79
80	vp = ap->a_vp;
81	node = VP_TO_TMPFS_NODE(vp);
82
83	switch (ap->a_kn->kn_filter){
84	case EVFILT_READ:
85		node->tn_status |= TMPFS_NODE_ACCESSED;
86		break;
87	case EVFILT_WRITE:
88		node->tn_status |= TMPFS_NODE_MODIFIED;
89		break;
90	}
91
92	return fifo_specops.vop_kqfilter(ap);
93}
94
95/* --------------------------------------------------------------------- */
96
97int
98tmpfs_fifo_close(struct vop_close_args *v)
99{
100	struct tmpfs_node *node;
101	node = VP_TO_TMPFS_NODE(v->a_vp);
102	node->tn_status |= TMPFS_NODE_ACCESSED;
103
104	tmpfs_update(v->a_vp);
105	return fifo_specops.vop_close(v);
106}
107