1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30/*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40#ifndef	_LIBSPL_SYS_UIO_H
41#define	_LIBSPL_SYS_UIO_H
42
43#include <sys/types.h>
44#include_next <sys/uio.h>
45
46#ifdef __APPLE__
47#include <sys/_types/_iovec_t.h>
48#endif
49
50#include <stdint.h>
51typedef struct iovec iovec_t;
52
53#if defined(__linux__) || defined(__APPLE__)
54typedef enum zfs_uio_rw {
55	UIO_READ =	0,
56	UIO_WRITE =	1,
57} zfs_uio_rw_t;
58
59typedef enum zfs_uio_seg {
60	UIO_USERSPACE =	0,
61	UIO_SYSSPACE =	1,
62} zfs_uio_seg_t;
63
64#elif defined(__FreeBSD__)
65typedef enum uio_seg  zfs_uio_seg_t;
66#endif
67
68typedef struct zfs_uio {
69	struct iovec	*uio_iov;	/* pointer to array of iovecs */
70	int		uio_iovcnt;	/* number of iovecs */
71	offset_t	uio_loffset;	/* file offset */
72	zfs_uio_seg_t	uio_segflg;	/* address space (kernel or user) */
73	uint16_t	uio_fmode;	/* file mode flags */
74	uint16_t	uio_extflg;	/* extended flags */
75	ssize_t		uio_resid;	/* residual count */
76} zfs_uio_t;
77
78#define	zfs_uio_segflg(uio)		(uio)->uio_segflg
79#define	zfs_uio_offset(uio)		(uio)->uio_loffset
80#define	zfs_uio_resid(uio)		(uio)->uio_resid
81#define	zfs_uio_iovcnt(uio)		(uio)->uio_iovcnt
82#define	zfs_uio_iovlen(uio, idx)	(uio)->uio_iov[(idx)].iov_len
83#define	zfs_uio_iovbase(uio, idx)	(uio)->uio_iov[(idx)].iov_base
84
85static inline void
86zfs_uio_iov_at_index(zfs_uio_t *uio, uint_t idx, void **base, uint64_t *len)
87{
88	*base = zfs_uio_iovbase(uio, idx);
89	*len = zfs_uio_iovlen(uio, idx);
90}
91
92static inline void
93zfs_uio_advance(zfs_uio_t *uio, ssize_t size)
94{
95	uio->uio_resid -= size;
96	uio->uio_loffset += size;
97}
98
99static inline offset_t
100zfs_uio_index_at_offset(zfs_uio_t *uio, offset_t off, uint_t *vec_idx)
101{
102	*vec_idx = 0;
103	while (*vec_idx < (uint_t)zfs_uio_iovcnt(uio) &&
104	    off >= (offset_t)zfs_uio_iovlen(uio, *vec_idx)) {
105		off -= zfs_uio_iovlen(uio, *vec_idx);
106		(*vec_idx)++;
107	}
108
109	return (off);
110}
111
112#endif	/* _SYS_UIO_H */
113