include/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  *  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 #ifdef HAVE_TOTALRAM_PAGES_FUNC
  37 #define zfs_totalram_pages      totalram_pages()
  38 #else
  39 #define zfs_totalram_pages      totalram_pages
  40 #endif
  41
  42 #define membar_producer()               smp_wmb()
  43 #define physmem                         zfs_totalram_pages
  44 #define freemem                 (nr_free_pages() + \
  45                                 global_page_state(NR_INACTIVE_FILE) + \
  46                                 global_page_state(NR_INACTIVE_ANON) + \
  47                                 global_page_state(NR_SLAB_RECLAIMABLE))
  48
  49 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
  50 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
  51
  52 static __inline__ int
  53 copyin(const void *from, void *to, size_t len)
  54 {
  55         /* On error copyin routine returns -1 */
  56         if (xcopyin(from, to, len))
  57                 return (-1);
  58
  59         return (0);
  60 }
  61
  62 static __inline__ int
  63 copyout(const void *from, void *to, size_t len)
  64 {
  65         /* On error copyout routine returns -1 */
  66         if (xcopyout(from, to, len))
  67                 return (-1);
  68
  69         return (0);
  70 }
  71
  72 static __inline__ int
  73 copyinstr(const void *from, void *to, size_t len, size_t *done)
  74 {
  75         size_t rc;
  76
  77         if (len == 0)
  78                 return (-ENAMETOOLONG);
  79
  80         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
  81
  82         memset(to, 0, len);
  83         rc = copyin(from, to, len - 1);
  84         if (done != NULL)
  85                 *done = rc;
  86
  87         return (0);
  88 }
  89
  90 #endif /* SPL_VMSYSTM_H */