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> 51 typedef struct iovec iovec_t; 52 53 #if defined(__linux__) || defined(__APPLE__) 54 typedef enum zfs_uio_rw { 55 UIO_READ = 0, 56 UIO_WRITE = 1, 57 } zfs_uio_rw_t; 58 59 typedef enum zfs_uio_seg { 60 UIO_USERSPACE = 0, 61 UIO_SYSSPACE = 1, 62 } zfs_uio_seg_t; 63 64 #elif defined(__FreeBSD__) 65 typedef enum uio_seg zfs_uio_seg_t; 66 #endif 67 68 typedef 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 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 void 93 zfs_uio_advance(zfs_uio_t *uio, size_t size) 94 { 95 uio->uio_resid -= size; 96 uio->uio_loffset += size; 97 } 98 99 static inline offset_t 100 zfs_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