include/sys/uio.h

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://github.com/behlendorf/spl/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23 \*****************************************************************************/
  24
  25 #ifndef _SPL_UIO_H
  26 #define _SPL_UIO_H
  27
  28 #include <linux/uio.h>
  29 #include <asm/uaccess.h>
  30 #include <sys/types.h>
  31
  32 typedef struct iovec iovec_t;
  33
  34 typedef enum uio_rw {
  35         UIO_READ =      0,
  36         UIO_WRITE =     1,
  37 } uio_rw_t;
  38
  39 typedef enum uio_seg {
  40         UIO_USERSPACE = 0,
  41         UIO_SYSSPACE =  1,
  42         UIO_USERISPACE= 2,
  43 } uio_seg_t;
  44
  45 typedef struct uio {
  46         struct iovec    *uio_iov;
  47         int             uio_iovcnt;
  48         offset_t        uio_loffset;
  49         uio_seg_t       uio_segflg;
  50         uint16_t        uio_fmode;
  51         uint16_t        uio_extflg;
  52         offset_t        uio_limit;
  53         ssize_t         uio_resid;
  54 } uio_t;
  55
  56 typedef struct aio_req {
  57         uio_t           *aio_uio;
  58         void            *aio_private;
  59 } aio_req_t;
  60
  61 typedef enum xuio_type {
  62         UIOTYPE_ASYNCIO,
  63         UIOTYPE_ZEROCOPY,
  64 } xuio_type_t;
  65
  66
  67 #define UIOA_IOV_MAX    16
  68
  69 typedef struct uioa_page_s {
  70         int     uioa_pfncnt;
  71         void    **uioa_ppp;
  72         caddr_t uioa_base;
  73         size_t  uioa_len;
  74 } uioa_page_t;
  75
  76 typedef struct xuio {
  77         uio_t xu_uio;
  78         enum xuio_type xu_type;
  79         union {
  80                 struct {
  81                         uint32_t xu_a_state;
  82                         ssize_t xu_a_mbytes;
  83                         uioa_page_t *xu_a_lcur;
  84                         void **xu_a_lppp;
  85                         void *xu_a_hwst[4];
  86                         uioa_page_t xu_a_locked[UIOA_IOV_MAX];
  87                 } xu_aio;
  88
  89                 struct {
  90                         int xu_zc_rw;
  91                         void *xu_zc_priv;
  92                 } xu_zc;
  93         } xu_ext;
  94 } xuio_t;
  95
  96 #define XUIO_XUZC_PRIV(xuio)    xuio->xu_ext.xu_zc.xu_zc_priv
  97 #define XUIO_XUZC_RW(xuio)      xuio->xu_ext.xu_zc.xu_zc_rw
  98
  99 #endif /* SPL_UIO_H */