1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance 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 2010 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 _SYS_UIO_IMPL_H
41 #define _SYS_UIO_IMPL_H
42
43 #include <sys/uio.h>
44 #include <sys/sysmacros.h>
45
46 extern int zfs_uiomove(void *, size_t, zfs_uio_rw_t, zfs_uio_t *);
47 extern int zfs_uiocopy(void *, size_t, zfs_uio_rw_t, zfs_uio_t *, size_t *);
48 extern void zfs_uioskip(zfs_uio_t *, size_t);
49 extern void zfs_uio_free_dio_pages(zfs_uio_t *, zfs_uio_rw_t);
50 extern int zfs_uio_get_dio_pages_alloc(zfs_uio_t *, zfs_uio_rw_t);
51 extern boolean_t zfs_uio_page_aligned(zfs_uio_t *);
52
53 static inline boolean_t
zfs_dio_page_aligned(void * buf)54 zfs_dio_page_aligned(void *buf)
55 {
56 return ((((uintptr_t)(buf) & (PAGESIZE - 1)) == 0) ?
57 B_TRUE : B_FALSE);
58 }
59
60 static inline boolean_t
zfs_dio_offset_aligned(uint64_t offset,uint64_t blksz)61 zfs_dio_offset_aligned(uint64_t offset, uint64_t blksz)
62 {
63 return (IS_P2ALIGNED(offset, blksz));
64 }
65
66 static inline boolean_t
zfs_dio_size_aligned(uint64_t size,uint64_t blksz)67 zfs_dio_size_aligned(uint64_t size, uint64_t blksz)
68 {
69 return ((size % blksz) == 0);
70 }
71
72 static inline boolean_t
zfs_dio_aligned(uint64_t offset,uint64_t size,uint64_t blksz)73 zfs_dio_aligned(uint64_t offset, uint64_t size, uint64_t blksz)
74 {
75 return (zfs_dio_offset_aligned(offset, blksz) &&
76 zfs_dio_size_aligned(size, blksz));
77 }
78
79 static inline boolean_t
zfs_uio_aligned(zfs_uio_t * uio,uint64_t blksz)80 zfs_uio_aligned(zfs_uio_t *uio, uint64_t blksz)
81 {
82 return (zfs_dio_aligned(zfs_uio_offset(uio), zfs_uio_resid(uio),
83 blksz));
84 }
85
86 static inline void
zfs_uio_iov_at_index(zfs_uio_t * uio,uint_t idx,void ** base,uint64_t * len)87 zfs_uio_iov_at_index(zfs_uio_t *uio, uint_t idx, void **base, uint64_t *len)
88 {
89 *base = zfs_uio_iovbase(uio, idx);
90 *len = zfs_uio_iovlen(uio, idx);
91 }
92
93 static inline offset_t
zfs_uio_index_at_offset(zfs_uio_t * uio,offset_t off,uint_t * vec_idx)94 zfs_uio_index_at_offset(zfs_uio_t *uio, offset_t off, uint_t *vec_idx)
95 {
96 *vec_idx = 0;
97 while (*vec_idx < zfs_uio_iovcnt(uio) &&
98 off >= zfs_uio_iovlen(uio, *vec_idx)) {
99 off -= zfs_uio_iovlen(uio, *vec_idx);
100 (*vec_idx)++;
101 }
102
103 return (off);
104 }
105
106 #endif /* _SYS_UIO_IMPL_H */
107