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  *  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 #ifdef HAVE_TOTALHIGH_PAGES
  43 #define zfs_totalhigh_pages     totalhigh_pages()
  44 #else
  45 #define zfs_totalhigh_pages     totalhigh_pages
  46 #endif
  47
  48 #define membar_producer()               smp_wmb()
  49 #define physmem                         zfs_totalram_pages
  50 #ifdef ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B
  51 #define freemem                 (nr_free_pages() + \
  52                                 global_page_state(NR_INACTIVE_FILE) + \
  53                                 global_page_state(NR_INACTIVE_ANON) + \
  54                                 global_page_state(NR_SLAB_RECLAIMABLE_B))
  55 #else
  56 #define freemem                 (nr_free_pages() + \
  57                                 global_page_state(NR_INACTIVE_FILE) + \
  58                                 global_page_state(NR_INACTIVE_ANON) + \
  59                                 global_page_state(NR_SLAB_RECLAIMABLE))
  60 #endif /* ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B */
  61
  62 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
  63 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
  64
  65 static __inline__ int
  66 copyin(const void *from, void *to, size_t len)
  67 {
  68         /* On error copyin routine returns -1 */
  69         if (xcopyin(from, to, len))
  70                 return (-1);
  71
  72         return (0);
  73 }
  74
  75 static __inline__ int
  76 copyout(const void *from, void *to, size_t len)
  77 {
  78         /* On error copyout routine returns -1 */
  79         if (xcopyout(from, to, len))
  80                 return (-1);
  81
  82         return (0);
  83 }
  84
  85 static __inline__ int
  86 copyinstr(const void *from, void *to, size_t len, size_t *done)
  87 {
  88         size_t rc;
  89
  90         if (len == 0)
  91                 return (-ENAMETOOLONG);
  92
  93         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
  94
  95         memset(to, 0, len);
  96         rc = copyin(from, to, len - 1);
  97         if (done != NULL)
  98                 *done = rc;
  99
 100         return (0);
 101 }
 102
 103 #endif /* SPL_VMSYSTM_H */