include/os/linux/spl/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  *
  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 <sys/debug.h>
  29 #include <linux/uio.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/blkdev_compat.h>
  32 #include <linux/mm.h>
  33 #include <linux/bio.h>
  34 #include <asm/uaccess.h>
  35 #include <sys/types.h>
  36
  37 typedef struct iovec iovec_t;
  38
  39 typedef enum zfs_uio_rw {
  40         UIO_READ =              0,
  41         UIO_WRITE =             1,
  42 } zfs_uio_rw_t;
  43
  44 typedef enum zfs_uio_seg {
  45         UIO_USERSPACE =         0,
  46         UIO_SYSSPACE =          1,
  47         UIO_BVEC =              2,
  48 #if defined(HAVE_VFS_IOV_ITER)
  49         UIO_ITER =              3,
  50 #endif
  51 } zfs_uio_seg_t;
  52
  53 typedef struct zfs_uio {
  54         union {
  55                 const struct iovec      *uio_iov;
  56                 const struct bio_vec    *uio_bvec;
  57 #if defined(HAVE_VFS_IOV_ITER)
  58                 struct iov_iter         *uio_iter;
  59 #endif
  60         };
  61         int             uio_iovcnt;
  62         offset_t        uio_loffset;
  63         zfs_uio_seg_t   uio_segflg;
  64         boolean_t       uio_fault_disable;
  65         uint16_t        uio_fmode;
  66         uint16_t        uio_extflg;
  67         ssize_t         uio_resid;
  68         size_t          uio_skip;
  69 } zfs_uio_t;
  70
  71 #define zfs_uio_segflg(u)               (u)->uio_segflg
  72 #define zfs_uio_offset(u)               (u)->uio_loffset
  73 #define zfs_uio_resid(u)                (u)->uio_resid
  74 #define zfs_uio_iovcnt(u)               (u)->uio_iovcnt
  75 #define zfs_uio_iovlen(u, idx)          (u)->uio_iov[(idx)].iov_len
  76 #define zfs_uio_iovbase(u, idx)         (u)->uio_iov[(idx)].iov_base
  77 #define zfs_uio_fault_disable(u, set)   (u)->uio_fault_disable = set
  78 #define zfs_uio_rlimit_fsize(z, u)      (0)
  79 #define zfs_uio_fault_move(p, n, rw, u) zfs_uiomove((p), (n), (rw), (u))
  80
  81 extern int zfs_uio_prefaultpages(ssize_t, zfs_uio_t *);
  82
  83 static inline void
  84 zfs_uio_setoffset(zfs_uio_t *uio, offset_t off)
  85 {
  86         uio->uio_loffset = off;
  87 }
  88
  89 static inline void
  90 zfs_uio_advance(zfs_uio_t *uio, size_t size)
  91 {
  92         uio->uio_resid -= size;
  93         uio->uio_loffset += size;
  94 }
  95
  96 static inline void
  97 zfs_uio_iovec_init(zfs_uio_t *uio, const struct iovec *iov,
  98     unsigned long nr_segs, offset_t offset, zfs_uio_seg_t seg, ssize_t resid,
  99     size_t skip)
 100 {
 101         ASSERT(seg == UIO_USERSPACE || seg == UIO_SYSSPACE);
 102
 103         uio->uio_iov = iov;
 104         uio->uio_iovcnt = nr_segs;
 105         uio->uio_loffset = offset;
 106         uio->uio_segflg = seg;
 107         uio->uio_fault_disable = B_FALSE;
 108         uio->uio_fmode = 0;
 109         uio->uio_extflg = 0;
 110         uio->uio_resid = resid;
 111         uio->uio_skip = skip;
 112 }
 113
 114 static inline void
 115 zfs_uio_bvec_init(zfs_uio_t *uio, struct bio *bio)
 116 {
 117         uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
 118         uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
 119         uio->uio_loffset = BIO_BI_SECTOR(bio) << 9;
 120         uio->uio_segflg = UIO_BVEC;
 121         uio->uio_fault_disable = B_FALSE;
 122         uio->uio_fmode = 0;
 123         uio->uio_extflg = 0;
 124         uio->uio_resid = BIO_BI_SIZE(bio);
 125         uio->uio_skip = BIO_BI_SKIP(bio);
 126 }
 127
 128 #if defined(HAVE_VFS_IOV_ITER)
 129 static inline void
 130 zfs_uio_iov_iter_init(zfs_uio_t *uio, struct iov_iter *iter, offset_t offset,
 131     ssize_t resid, size_t skip)
 132 {
 133         uio->uio_iter = iter;
 134         uio->uio_iovcnt = iter->nr_segs;
 135         uio->uio_loffset = offset;
 136         uio->uio_segflg = UIO_ITER;
 137         uio->uio_fault_disable = B_FALSE;
 138         uio->uio_fmode = 0;
 139         uio->uio_extflg = 0;
 140         uio->uio_resid = resid;
 141         uio->uio_skip = skip;
 142 }
 143 #endif
 144
 145 #endif /* SPL_UIO_H */