include/os/linux/spl/sys/vmsystm.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  *
  10  *  The SPL is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License as published by the
  12  *  Free Software Foundation; either version 2 of the License, or (at your
  13  *  option) any later version.
  14  *
  15  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18  *  for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #ifndef _SPL_VMSYSTM_H
  25 #define _SPL_VMSYSTM_H
  26
  27 #include <linux/mmzone.h>
  28 #include <linux/mm.h>
  29 #include <linux/swap.h>
  30 #include <linux/highmem.h>
  31 #include <linux/vmalloc.h>
  32 #include <sys/types.h>
  33 #include <asm/uaccess.h>
  34
  35 #ifdef HAVE_TOTALRAM_PAGES_FUNC
  36 #define zfs_totalram_pages      totalram_pages()
  37 #else
  38 #define zfs_totalram_pages      totalram_pages
  39 #endif
  40
  41 #ifdef HAVE_TOTALHIGH_PAGES
  42 #define zfs_totalhigh_pages     totalhigh_pages()
  43 #else
  44 #define zfs_totalhigh_pages     totalhigh_pages
  45 #endif
  46
  47 #define membar_consumer()               smp_rmb()
  48 #define membar_producer()               smp_wmb()
  49 #define membar_sync()                   smp_mb()
  50
  51 #define physmem                         zfs_totalram_pages
  52
  53 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
  54 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
  55
  56 static __inline__ int
  57 copyin(const void *from, void *to, size_t len)
  58 {
  59         /* On error copyin routine returns -1 */
  60         if (xcopyin(from, to, len))
  61                 return (-1);
  62
  63         return (0);
  64 }
  65
  66 static __inline__ int
  67 copyout(const void *from, void *to, size_t len)
  68 {
  69         /* On error copyout routine returns -1 */
  70         if (xcopyout(from, to, len))
  71                 return (-1);
  72
  73         return (0);
  74 }
  75
  76 static __inline__ int
  77 copyinstr(const void *from, void *to, size_t len, size_t *done)
  78 {
  79         size_t rc;
  80
  81         if (len == 0)
  82                 return (-ENAMETOOLONG);
  83
  84         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
  85
  86         memset(to, 0, len);
  87         rc = copyin(from, to, len - 1);
  88         if (done != NULL)
  89                 *done = rc;
  90
  91         return (0);
  92 }
  93
  94 #endif /* SPL_VMSYSTM_H */