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  *  Copyright (c) 2015 by Chunwei Chen. All rights reserved.
   5  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   6  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   7  *  UCRL-CODE-235197
   8  *
   9  *  This file is part of the SPL, Solaris Porting Layer.
  10  *  For details, see <http://zfsonlinux.org/>.
  11  *
  12  *  The SPL is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by the
  14  *  Free Software Foundation; either version 2 of the License, or (at your
  15  *  option) any later version.
  16  *
  17  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #ifndef _SPL_UIO_H
  27 #define _SPL_UIO_H
  28
  29 #include <linux/uio.h>
  30 #include <linux/blkdev.h>
  31 #include <asm/uaccess.h>
  32 #include <sys/types.h>
  33
  34 typedef struct iovec iovec_t;
  35
  36 typedef enum uio_rw {
  37         UIO_READ =      0,
  38         UIO_WRITE =     1,
  39 } uio_rw_t;
  40
  41 typedef enum uio_seg {
  42         UIO_USERSPACE = 0,
  43         UIO_SYSSPACE =  1,
  44         UIO_USERISPACE= 2,
  45         UIO_BVEC =      3,
  46 } uio_seg_t;
  47
  48 typedef struct uio {
  49         union {
  50                 const struct iovec      *uio_iov;
  51                 const struct bio_vec    *uio_bvec;
  52         };
  53         int             uio_iovcnt;
  54         offset_t        uio_loffset;
  55         uio_seg_t       uio_segflg;
  56         uint16_t        uio_fmode;
  57         uint16_t        uio_extflg;
  58         offset_t        uio_limit;
  59         ssize_t         uio_resid;
  60         size_t          uio_skip;
  61 } uio_t;
  62
  63 typedef struct aio_req {
  64         uio_t           *aio_uio;
  65         void            *aio_private;
  66 } aio_req_t;
  67
  68 typedef enum xuio_type {
  69         UIOTYPE_ASYNCIO,
  70         UIOTYPE_ZEROCOPY,
  71 } xuio_type_t;
  72
  73
  74 #define UIOA_IOV_MAX    16
  75
  76 typedef struct uioa_page_s {
  77         int     uioa_pfncnt;
  78         void    **uioa_ppp;
  79         caddr_t uioa_base;
  80         size_t  uioa_len;
  81 } uioa_page_t;
  82
  83 typedef struct xuio {
  84         uio_t xu_uio;
  85         enum xuio_type xu_type;
  86         union {
  87                 struct {
  88                         uint32_t xu_a_state;
  89                         ssize_t xu_a_mbytes;
  90                         uioa_page_t *xu_a_lcur;
  91                         void **xu_a_lppp;
  92                         void *xu_a_hwst[4];
  93                         uioa_page_t xu_a_locked[UIOA_IOV_MAX];
  94                 } xu_aio;
  95
  96                 struct {
  97                         int xu_zc_rw;
  98                         void *xu_zc_priv;
  99                 } xu_zc;
 100         } xu_ext;
 101 } xuio_t;
 102
 103 #define XUIO_XUZC_PRIV(xuio)    xuio->xu_ext.xu_zc.xu_zc_priv
 104 #define XUIO_XUZC_RW(xuio)      xuio->xu_ext.xu_zc.xu_zc_rw
 105
 106 #endif /* SPL_UIO_H */