proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / sys / file.h
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1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)file.h 8.3 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $
dadab5e9 35 * $DragonFly: src/sys/sys/file.h,v 1.3 2003/06/25 03:56:10 dillon Exp $
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36 */
37
38#ifndef _SYS_FILE_H_
39#define _SYS_FILE_H_
40
41#ifndef _KERNEL
42#include <sys/fcntl.h>
43#include <sys/unistd.h>
44#endif
45
46#ifdef _KERNEL
47#include <sys/queue.h>
48
49struct stat;
50struct proc;
dadab5e9 51struct thread;
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52struct uio;
53struct knote;
54
55/*
56 * Kernel descriptor table.
57 * One entry for each open kernel vnode and socket.
58 */
59struct file {
60 LIST_ENTRY(file) f_list;/* list of active files */
61 short f_FILLER3; /* (old f_flag) */
62#define DTYPE_VNODE 1 /* file */
63#define DTYPE_SOCKET 2 /* communications endpoint */
64#define DTYPE_PIPE 3 /* pipe */
65#define DTYPE_FIFO 4 /* fifo (named pipe) */
66#define DTYPE_KQUEUE 5 /* event queue */
67#define DTYPE_CRYPTO 6 /* crypto */
68 short f_type; /* descriptor type */
69 u_int f_flag; /* see fcntl.h */
70 struct ucred *f_cred; /* credentials associated with descriptor */
71 struct fileops {
72 int (*fo_read) __P((struct file *fp, struct uio *uio,
73 struct ucred *cred, int flags,
dadab5e9 74 struct thread *td));
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75 int (*fo_write) __P((struct file *fp, struct uio *uio,
76 struct ucred *cred, int flags,
dadab5e9 77 struct thread *td));
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78#define FOF_OFFSET 1
79 int (*fo_ioctl) __P((struct file *fp, u_long com,
dadab5e9 80 caddr_t data, struct thread *td));
984263bc 81 int (*fo_poll) __P((struct file *fp, int events,
dadab5e9 82 struct ucred *cred, struct thread *td));
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83 int (*fo_kqfilter) __P((struct file *fp,
84 struct knote *kn));
85 int (*fo_stat) __P((struct file *fp, struct stat *sb,
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86 struct thread *td));
87 int (*fo_close) __P((struct file *fp, struct thread *td));
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88 } *f_ops;
89 int f_seqcount; /*
90 * count of sequential accesses -- cleared
91 * by most seek operations.
92 */
93 off_t f_nextoff; /*
94 * offset of next expected read or write
95 */
96 off_t f_offset;
97 caddr_t f_data; /* vnode or socket */
98 int f_count; /* reference count */
99 int f_msgcount; /* reference count from message queue */
100};
101
102#ifdef MALLOC_DECLARE
103MALLOC_DECLARE(M_FILE);
104#endif
105
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106extern int fdrop __P((struct file *fp, struct thread *td));
107
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108LIST_HEAD(filelist, file);
109extern struct filelist filehead; /* head of list of open files */
110extern struct fileops vnops;
111extern struct fileops badfileops;
112extern int maxfiles; /* kernel limit on number of open files */
113extern int maxfilesperproc; /* per process limit on number of open files */
114extern int nfiles; /* actual number of open files */
115
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116#endif /* _KERNEL */
117
118#endif /* !SYS_FILE_H */