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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * tmpfs vnode interface for named pipes.
35 */
36
37 #include <sys/kernel.h>
38 #include <sys/param.h>
39 #include <sys/filedesc.h>
40 #include <sys/proc.h>
41 #include <sys/vnode.h>
42
43 #include <vm/vm.h>
44 #include <vm/vm_object.h>
45
46 #include <vfs/fifofs/fifo.h>
47 #include <vfs/tmpfs/tmpfs.h>
48 #include <vfs/tmpfs/tmpfs_vnops.h>
49
50 /* --------------------------------------------------------------------- */
51
52 static int
tmpfs_fifo_kqfilter(struct vop_kqfilter_args * ap)53 tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
54 {
55 struct vnode *vp;
56 struct tmpfs_node *node;
57
58 vp = ap->a_vp;
59 node = VP_TO_TMPFS_NODE(vp);
60
61 switch (ap->a_kn->kn_filter){
62 case EVFILT_READ:
63 node->tn_status |= TMPFS_NODE_ACCESSED;
64 break;
65 case EVFILT_WRITE:
66 node->tn_status |= TMPFS_NODE_MODIFIED;
67 break;
68 }
69
70 return fifo_vnode_vops.vop_kqfilter(ap);
71 }
72
73 /* --------------------------------------------------------------------- */
74
75 static int
tmpfs_fifo_close(struct vop_close_args * ap)76 tmpfs_fifo_close(struct vop_close_args *ap)
77 {
78 struct tmpfs_node *node;
79 node = VP_TO_TMPFS_NODE(ap->a_vp);
80 node->tn_status |= TMPFS_NODE_ACCESSED;
81
82 tmpfs_update(ap->a_vp);
83 return fifo_vnode_vops.vop_close(ap);
84 }
85
86 /*
87 * vnode operations vector used for fifos stored in a tmpfs file system.
88 */
89 struct vop_ops tmpfs_fifo_vops = {
90 .vop_default = fifo_vnoperate,
91 .vop_close = tmpfs_fifo_close,
92 .vop_reclaim = tmpfs_reclaim,
93 .vop_access = tmpfs_access,
94 .vop_getattr = tmpfs_getattr,
95 .vop_setattr = tmpfs_setattr,
96 .vop_kqfilter = tmpfs_fifo_kqfilter,
97 };
98