include/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  *  For details, see <http://zfsonlinux.org/>.
  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_VMSYSTM_H
  26 #define _SPL_VMSYSTM_H
  27
  28 #include <linux/mmzone.h>
  29 #include <linux/mm.h>
  30 #include <linux/swap.h>
  31 #include <linux/highmem.h>
  32 #include <linux/vmalloc.h>
  33 #include <sys/types.h>
  34 #include <asm/uaccess.h>
  35
  36 #define membar_producer()               smp_wmb()
  37 #define physmem                         totalram_pages
  38 #define freemem                         nr_free_pages()
  39
  40 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
  41 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
  42
  43 static __inline__ int
  44 copyin(const void *from, void *to, size_t len)
  45 {
  46         /* On error copyin routine returns -1 */
  47         if (xcopyin(from, to, len))
  48                 return -1;
  49
  50         return 0;
  51 }
  52
  53 static __inline__ int
  54 copyout(const void *from, void *to, size_t len)
  55 {
  56         /* On error copyout routine returns -1 */
  57         if (xcopyout(from, to, len))
  58                 return -1;
  59
  60         return 0;
  61 }
  62
  63 static __inline__ int
  64 copyinstr(const void *from, void *to, size_t len, size_t *done)
  65 {
  66         size_t rc;
  67
  68         if (len == 0)
  69                 return -ENAMETOOLONG;
  70
  71         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
  72
  73         memset(to, 0, len);
  74         rc = copyin(from, to, len - 1);
  75         if (done != NULL)
  76                 *done = rc;
  77
  78         return 0;
  79 }
  80
  81 #endif /* SPL_VMSYSTM_H */