fs/aufs/hbl.h

   1 /*
   2  * Copyright (C) 2017 Junjiro R. Okajima
   3  *
   4  * This program, aufs is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * helpers for hlist_bl.h
  20  */
  21
  22 #ifndef __AUFS_HBL_H__
  23 #define __AUFS_HBL_H__
  24
  25 #ifdef __KERNEL__
  26
  27 #include <linux/list_bl.h>
  28
  29 static inline void au_hbl_add(struct hlist_bl_node *node,
  30                               struct hlist_bl_head *hbl)
  31 {
  32         hlist_bl_lock(hbl);
  33         hlist_bl_add_head(node, hbl);
  34         hlist_bl_unlock(hbl);
  35 }
  36
  37 static inline void au_hbl_del(struct hlist_bl_node *node,
  38                               struct hlist_bl_head *hbl)
  39 {
  40         hlist_bl_lock(hbl);
  41         hlist_bl_del(node);
  42         hlist_bl_unlock(hbl);
  43 }
  44
  45 #define au_hbl_for_each(pos, head)                                      \
  46         for (pos = hlist_bl_first(head);                                \
  47              pos;                                                       \
  48              pos = pos->next)
  49
  50 static inline unsigned long au_hbl_count(struct hlist_bl_head *hbl)
  51 {
  52         unsigned long cnt;
  53         struct hlist_bl_node *pos;
  54
  55         cnt = 0;
  56         hlist_bl_lock(hbl);
  57         au_hbl_for_each(pos, hbl)
  58                 cnt++;
  59         hlist_bl_unlock(hbl);
  60         return cnt;
  61 }
  62
  63 #endif /* __KERNEL__ */
  64 #endif /* __AUFS_HBL_H__ */