From 883a40fff427d200be41d3faabab1dca9a84b353 Mon Sep 17 00:00:00 2001 From: Jorgen Lundman Date: Mon, 15 Jun 2020 02:09:55 +0900 Subject: Add convenience wrappers for common uio usage The macOS uio struct is opaque and the API must be used, this makes the smallest changes to the code for all platforms. Reviewed-by: Matt Macy Reviewed-by: Brian Behlendorf Signed-off-by: Jorgen Lundman Closes #10412 --- lib/libspl/include/sys/Makefile.am | 1 + lib/libspl/include/sys/uio.h | 152 +++++++++++++++++++++++++++++++++++++ 2 files changed, 153 insertions(+) create mode 100644 lib/libspl/include/sys/uio.h (limited to 'lib/libspl/include/sys') diff --git a/lib/libspl/include/sys/Makefile.am b/lib/libspl/include/sys/Makefile.am index 8f9c2fa99..5125b8ac3 100644 --- a/lib/libspl/include/sys/Makefile.am +++ b/lib/libspl/include/sys/Makefile.am @@ -39,6 +39,7 @@ libspl_HEADERS = \ $(top_srcdir)/lib/libspl/include/sys/types32.h \ $(top_srcdir)/lib/libspl/include/sys/types.h \ $(top_srcdir)/lib/libspl/include/sys/tzfile.h \ + $(top_srcdir)/lib/libspl/include/sys/uio.h \ $(top_srcdir)/lib/libspl/include/sys/va_list.h \ $(top_srcdir)/lib/libspl/include/sys/varargs.h \ $(top_srcdir)/lib/libspl/include/sys/vnode.h \ diff --git a/lib/libspl/include/sys/uio.h b/lib/libspl/include/sys/uio.h new file mode 100644 index 000000000..6d892dd3e --- /dev/null +++ b/lib/libspl/include/sys/uio.h @@ -0,0 +1,152 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ +/* All Rights Reserved */ + +/* + * University Copyright- Copyright (c) 1982, 1986, 1988 + * The Regents of the University of California + * All Rights Reserved + * + * University Acknowledgment- Portions of this document are derived from + * software developed by the University of California, Berkeley, and its + * contributors. + */ + +#ifndef _LIBSPL_SYS_UIO_H +#define _LIBSPL_SYS_UIO_H + +#include +#include_next + +#ifdef __APPLE__ +#include +#endif + +#include +typedef struct iovec iovec_t; + +#if defined(__linux__) || defined(__APPLE__) +typedef enum uio_rw { + UIO_READ = 0, + UIO_WRITE = 1, +} uio_rw_t; + +typedef enum uio_seg { + UIO_USERSPACE = 0, + UIO_SYSSPACE = 1, + UIO_USERISPACE = 2, +} uio_seg_t; + +#elif defined(__FreeBSD__) +typedef enum uio_seg uio_seg_t; +#endif + +typedef struct uio { + struct iovec *uio_iov; /* pointer to array of iovecs */ + int uio_iovcnt; /* number of iovecs */ + offset_t uio_loffset; /* file offset */ + uio_seg_t uio_segflg; /* address space (kernel or user) */ + uint16_t uio_fmode; /* file mode flags */ + uint16_t uio_extflg; /* extended flags */ + offset_t uio_limit; /* u-limit (maximum byte offset) */ + ssize_t uio_resid; /* residual count */ +} uio_t; + +typedef enum xuio_type { + UIOTYPE_ASYNCIO, + UIOTYPE_ZEROCOPY, +} xuio_type_t; + +#define UIOA_IOV_MAX 16 + +typedef struct uioa_page_s { /* locked uio_iov state */ + int uioa_pfncnt; /* count of pfn_t(s) in *uioa_ppp */ + void **uioa_ppp; /* page_t or pfn_t array */ + caddr_t uioa_base; /* address base */ + size_t uioa_len; /* span length */ +} uioa_page_t; + +typedef struct xuio { + uio_t xu_uio; /* embedded UIO structure */ + + /* Extended uio fields */ + enum xuio_type xu_type; /* uio type */ + union { + struct { + uint32_t xu_a_state; /* state of async i/o */ + ssize_t xu_a_mbytes; /* bytes moved */ + uioa_page_t *xu_a_lcur; /* uioa_locked[] pointer */ + void **xu_a_lppp; /* lcur->uioa_pppp[] pointer */ + void *xu_a_hwst[4]; /* opaque hardware state */ + uioa_page_t xu_a_locked[UIOA_IOV_MAX]; + } xu_aio; + + struct { + int xu_zc_rw; /* read or write buffer */ + void *xu_zc_priv; /* fs specific */ + } xu_zc; + } xu_ext; +} xuio_t; + +#define XUIO_XUZC_PRIV(xuio) xuio->xu_ext.xu_zc.xu_zc_priv +#define XUIO_XUZC_RW(xuio) xuio->xu_ext.xu_zc.xu_zc_rw + +#define uio_segflg(uio) (uio)->uio_segflg +#define uio_offset(uio) (uio)->uio_loffset +#define uio_resid(uio) (uio)->uio_resid +#define uio_iovcnt(uio) (uio)->uio_iovcnt +#define uio_iovlen(uio, idx) (uio)->uio_iov[(idx)].iov_len +#define uio_iovbase(uio, idx) (uio)->uio_iov[(idx)].iov_base + +static inline void +uio_iov_at_index(uio_t *uio, uint_t idx, void **base, uint64_t *len) +{ + *base = uio_iovbase(uio, idx); + *len = uio_iovlen(uio, idx); +} + +static inline void +uio_advance(uio_t *uio, size_t size) +{ + uio->uio_resid -= size; + uio->uio_loffset += size; +} + +static inline offset_t +uio_index_at_offset(uio_t *uio, offset_t off, uint_t *vec_idx) +{ + *vec_idx = 0; + while (*vec_idx < uio_iovcnt(uio) && off >= uio_iovlen(uio, *vec_idx)) { + off -= uio_iovlen(uio, *vec_idx); + (*vec_idx)++; + } + + return (off); +} + +#endif /* _SYS_UIO_H */ -- cgit v1.2.3