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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27/* All Rights Reserved   */
28
29/*
30 * University Copyright- Copyright (c) 1982, 1986, 1988
31 * The Regents of the University of California
32 * All Rights Reserved
33 *
34 * University Acknowledgment- Portions of this document are derived from
35 * software developed by the University of California, Berkeley, and its
36 * contributors.
37 */
38
39/*
40 * $FreeBSD$
41 */
42
43#include <sys/param.h>
44#include <sys/uio_impl.h>
45#include <sys/vnode.h>
46#include <sys/zfs_znode.h>
47
48int
49zfs_uiomove(void *cp, size_t n, zfs_uio_rw_t dir, zfs_uio_t *uio)
50{
51	ASSERT3U(zfs_uio_rw(uio), ==, dir);
52	return (uiomove(cp, (int)n, GET_UIO_STRUCT(uio)));
53}
54
55/*
56 * same as zfs_uiomove() but doesn't modify uio structure.
57 * return in cbytes how many bytes were copied.
58 */
59int
60zfs_uiocopy(void *p, size_t n, zfs_uio_rw_t rw, zfs_uio_t *uio, size_t *cbytes)
61{
62	struct iovec small_iovec[1];
63	struct uio small_uio_clone;
64	struct uio *uio_clone;
65	int error;
66
67	ASSERT3U(zfs_uio_rw(uio), ==, rw);
68	if (zfs_uio_iovcnt(uio) == 1) {
69		small_uio_clone = *(GET_UIO_STRUCT(uio));
70		small_iovec[0] = *(GET_UIO_STRUCT(uio)->uio_iov);
71		small_uio_clone.uio_iov = small_iovec;
72		uio_clone = &small_uio_clone;
73	} else {
74		uio_clone = cloneuio(GET_UIO_STRUCT(uio));
75	}
76
77	error = vn_io_fault_uiomove(p, n, uio_clone);
78	*cbytes = zfs_uio_resid(uio) - uio_clone->uio_resid;
79	if (uio_clone != &small_uio_clone)
80		free(uio_clone, M_IOV);
81	return (error);
82}
83
84/*
85 * Drop the next n chars out of *uiop.
86 */
87void
88zfs_uioskip(zfs_uio_t *uio, size_t n)
89{
90	zfs_uio_seg_t segflg;
91
92	/* For the full compatibility with illumos. */
93	if (n > zfs_uio_resid(uio))
94		return;
95
96	segflg = zfs_uio_segflg(uio);
97	zfs_uio_segflg(uio) = UIO_NOCOPY;
98	zfs_uiomove(NULL, n, zfs_uio_rw(uio), uio);
99	zfs_uio_segflg(uio) = segflg;
100}
101
102int
103zfs_uio_fault_move(void *p, size_t n, zfs_uio_rw_t dir, zfs_uio_t *uio)
104{
105	ASSERT3U(zfs_uio_rw(uio), ==, dir);
106	return (vn_io_fault_uiomove(p, n, GET_UIO_STRUCT(uio)));
107}
108