include/linux/list_compat.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_LIST_COMPAT_H
  26 #define _SPL_LIST_COMPAT_H
  27
  28 #include <linux/list.h>
  29
  30 #ifndef list_for_each_entry_safe_reverse
  31
  32 /**
  33  * list_for_each_entry_safe_reverse
  34  * @pos:        the type * to use as a loop cursor.
  35  * @n:          another type * to use as temporary storage
  36  * @head:       the head for your list.
  37  * @member:     the name of the list_struct within the struct.
  38  *
  39  * Iterate backwards over list of given type, safe against removal
  40  * of list entry.
  41  */
  42 #define list_for_each_entry_safe_reverse(pos, n, head, member)          \
  43         for (pos = list_entry((head)->prev, typeof(*pos), member),      \
  44                 n = list_entry(pos->member.prev, typeof(*pos), member); \
  45              &pos->member != (head);                                    \
  46              pos = n, n = list_entry(n->member.prev, typeof(*n), member))
  47
  48 #endif /* list_for_each_entry_safe_reverse */
  49
  50 #endif /* SPL_LIST_COMPAT_H */
  51