109 lines
3 KiB
C
109 lines
3 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/*
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* University Copyright- Copyright (c) 1982, 1986, 1988
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* The Regents of the University of California
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* All Rights Reserved
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*
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* University Acknowledgment- Portions of this document are derived from
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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#ifndef _LIBSPL_SYS_UIO_H
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#define _LIBSPL_SYS_UIO_H
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#include_next <sys/uio.h>
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typedef struct iovec iovec_t;
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typedef enum uio_rw {
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UIO_READ = 0,
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UIO_WRITE = 1,
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} uio_rw_t;
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typedef enum uio_seg {
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UIO_USERSPACE = 0,
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UIO_SYSSPACE = 1,
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UIO_USERISPACE = 2,
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} uio_seg_t;
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typedef struct uio {
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struct iovec *uio_iov; /* pointer to array of iovecs */
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int uio_iovcnt; /* number of iovecs */
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offset_t uio_loffset; /* file offset */
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uio_seg_t uio_segflg; /* address space (kernel or user) */
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uint16_t uio_fmode; /* file mode flags */
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uint16_t uio_extflg; /* extended flags */
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offset_t uio_limit; /* u-limit (maximum byte offset) */
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ssize_t uio_resid; /* residual count */
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} uio_t;
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typedef enum xuio_type {
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UIOTYPE_ASYNCIO,
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UIOTYPE_ZEROCOPY,
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} xuio_type_t;
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#define UIOA_IOV_MAX 16
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typedef struct uioa_page_s { /* locked uio_iov state */
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int uioa_pfncnt; /* count of pfn_t(s) in *uioa_ppp */
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void **uioa_ppp; /* page_t or pfn_t arrary */
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caddr_t uioa_base; /* address base */
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size_t uioa_len; /* span length */
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} uioa_page_t;
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typedef struct xuio {
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uio_t xu_uio; /* embedded UIO structure */
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/* Extended uio fields */
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enum xuio_type xu_type; /* uio type */
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union {
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struct {
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uint32_t xu_a_state; /* state of async i/o */
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ssize_t xu_a_mbytes; /* bytes moved */
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uioa_page_t *xu_a_lcur; /* uioa_locked[] pointer */
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void **xu_a_lppp; /* lcur->uioa_pppp[] pointer */
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void *xu_a_hwst[4]; /* opaque hardware state */
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uioa_page_t xu_a_locked[UIOA_IOV_MAX];
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} xu_aio;
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struct {
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int xu_zc_rw; /* read or write buffer */
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void *xu_zc_priv; /* fs specific */
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} xu_zc;
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} xu_ext;
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} xuio_t;
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#define XUIO_XUZC_PRIV(xuio) xuio->xu_ext.xu_zc.xu_zc_priv
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#define XUIO_XUZC_RW(xuio) xuio->xu_ext.xu_zc.xu_zc_rw
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#endif /* _SYS_UIO_H */
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