Get rid of the weird FSMID update path in the vnode and namecache code.
[dragonfly.git] / sys / sys / uio.h
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1/*
2 * Copyright (c) 1982, 1986, 1993, 1994
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 * @(#)uio.h 8.5 (Berkeley) 2/22/94
34 * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $
eb687d4f 35 * $DragonFly: src/sys/sys/uio.h,v 1.9 2004/07/27 13:11:22 hmp Exp $
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36 */
37
38#ifndef _SYS_UIO_H_
39#define _SYS_UIO_H_
40
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41#include <sys/malloc.h> /* Needed to inline iovec_free(). */
42
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43/*
44 * XXX
45 * iov_base should be a void *.
46 */
47struct iovec {
48 char *iov_base; /* Base address. */
49 size_t iov_len; /* Length. */
50};
51
52enum uio_rw { UIO_READ, UIO_WRITE };
53
54/* Segment flag values. */
55enum uio_seg {
56 UIO_USERSPACE, /* from user data space */
57 UIO_SYSSPACE, /* from system space */
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58 UIO_NOCOPY /* don't copy, already in object */
59};
60
aa447efa 61#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
984263bc 62
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63/*
64 * uio_td is primarily used for USERSPACE transfers, but some devices
65 * like ttys may also use it to get at the process.
66 */
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67struct uio {
68 struct iovec *uio_iov;
69 int uio_iovcnt;
70 off_t uio_offset;
71 int uio_resid;
72 enum uio_seg uio_segflg;
73 enum uio_rw uio_rw;
dadab5e9 74 struct thread *uio_td;
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75};
76
77/*
78 * Limits
79 */
80#define UIO_MAXIOV 1024 /* max 1K of iov's */
81#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
82
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83#endif
84
85#if defined(_KERNEL)
86
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87struct vm_object;
88
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89void uio_yield (void);
90int uiomove (caddr_t, int, struct uio *);
25e80b06 91int uiomove_frombuf (void *buf, int buflen, struct uio *uio);
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92int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
93 struct uio *uio);
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94int uiomoveco (caddr_t, int, struct uio *, struct vm_object *);
95int uioread (int, struct uio *, struct vm_object *, int *);
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96int iovec_copyin(struct iovec *, struct iovec **, struct iovec *,
97 size_t, size_t *);
98
99static __inline void
100iovec_free(struct iovec **kiov, struct iovec *siov)
101{
102 if (*kiov != siov) {
103 FREE(*kiov, M_IOV);
104 *kiov = NULL;
105 }
106}
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107
108#else /* !_KERNEL */
109
110#include <sys/cdefs.h>
111
112__BEGIN_DECLS
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113ssize_t readv (int, const struct iovec *, int);
114ssize_t writev (int, const struct iovec *, int);
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115__END_DECLS
116
117#endif /* _KERNEL */
118
119#endif /* !_SYS_UIO_H_ */