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 2010 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 #ifndef _SYS_UIO_IMPL_H 40 #define _SYS_UIO_IMPL_H 41 42 #include <sys/uio.h> 43 #include <sys/sysmacros.h> 44 45 extern int zfs_uiomove(void *, size_t, zfs_uio_rw_t, zfs_uio_t *); 46 extern int zfs_uiocopy(void *, size_t, zfs_uio_rw_t, zfs_uio_t *, size_t *); 47 extern void zfs_uioskip(zfs_uio_t *, size_t); 48 extern void zfs_uio_free_dio_pages(zfs_uio_t *, zfs_uio_rw_t); 49 extern int zfs_uio_get_dio_pages_alloc(zfs_uio_t *, zfs_uio_rw_t); 50 extern boolean_t zfs_uio_page_aligned(zfs_uio_t *); 51 52 static inline boolean_t 53 zfs_dio_page_aligned(void *buf) 54 { 55 return ((((uintptr_t)(buf) & (PAGESIZE - 1)) == 0) ? 56 B_TRUE : B_FALSE); 57 } 58 59 static inline boolean_t 60 zfs_dio_offset_aligned(uint64_t offset, uint64_t blksz) 61 { 62 return (IS_P2ALIGNED(offset, blksz)); 63 } 64 65 static inline boolean_t 66 zfs_dio_size_aligned(uint64_t size, uint64_t blksz) 67 { 68 return ((size % blksz) == 0); 69 } 70 71 static inline boolean_t 72 zfs_dio_aligned(uint64_t offset, uint64_t size, uint64_t blksz) 73 { 74 return (zfs_dio_offset_aligned(offset, blksz) && 75 zfs_dio_size_aligned(size, blksz)); 76 } 77 78 static inline boolean_t 79 zfs_uio_aligned(zfs_uio_t *uio, uint64_t blksz) 80 { 81 return (zfs_dio_aligned(zfs_uio_offset(uio), zfs_uio_resid(uio), 82 blksz)); 83 } 84 85 static inline void 86 zfs_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 92 static inline offset_t 93 zfs_uio_index_at_offset(zfs_uio_t *uio, offset_t off, uint_t *vec_idx) 94 { 95 *vec_idx = 0; 96 while (*vec_idx < zfs_uio_iovcnt(uio) && 97 off >= zfs_uio_iovlen(uio, *vec_idx)) { 98 off -= zfs_uio_iovlen(uio, *vec_idx); 99 (*vec_idx)++; 100 } 101 102 return (off); 103 } 104 105 #endif /* _SYS_UIO_IMPL_H */ 106