fs/aufs/hbl.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2017-2019 Junjiro R. Okajima
   4  *
   5  * This program, aufs is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /*
  20  * helpers for hlist_bl.h
  21  */
  22
  23 #ifndef __AUFS_HBL_H__
  24 #define __AUFS_HBL_H__
  25
  26 #ifdef __KERNEL__
  27
  28 #include <linux/list_bl.h>
  29
  30 static inline void au_hbl_add(struct hlist_bl_node *node,
  31                               struct hlist_bl_head *hbl)
  32 {
  33         hlist_bl_lock(hbl);
  34         hlist_bl_add_head(node, hbl);
  35         hlist_bl_unlock(hbl);
  36 }
  37
  38 static inline void au_hbl_del(struct hlist_bl_node *node,
  39                               struct hlist_bl_head *hbl)
  40 {
  41         hlist_bl_lock(hbl);
  42         hlist_bl_del(node);
  43         hlist_bl_unlock(hbl);
  44 }
  45
  46 #define au_hbl_for_each(pos, head)                                      \
  47         for (pos = hlist_bl_first(head);                                \
  48              pos;                                                       \
  49              pos = pos->next)
  50
  51 static inline unsigned long au_hbl_count(struct hlist_bl_head *hbl)
  52 {
  53         unsigned long cnt;
  54         struct hlist_bl_node *pos;
  55
  56         cnt = 0;
  57         hlist_bl_lock(hbl);
  58         au_hbl_for_each(pos, hbl)
  59                 cnt++;
  60         hlist_bl_unlock(hbl);
  61         return cnt;
  62 }
  63
  64 #endif /* __KERNEL__ */
  65 #endif /* __AUFS_HBL_H__ */