fs/aufs/spl.h

   1 /*
   2  * Copyright (C) 2005-2017 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  * simple list protected by a spinlock
  20  */
  21
  22 #ifndef __AUFS_SPL_H__
  23 #define __AUFS_SPL_H__
  24
  25 #ifdef __KERNEL__
  26
  27 #if 0
  28 struct au_splhead {
  29         spinlock_t              spin;
  30         struct list_head        head;
  31 };
  32
  33 static inline void au_spl_init(struct au_splhead *spl)
  34 {
  35         spin_lock_init(&spl->spin);
  36         INIT_LIST_HEAD(&spl->head);
  37 }
  38
  39 static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
  40 {
  41         spin_lock(&spl->spin);
  42         list_add(list, &spl->head);
  43         spin_unlock(&spl->spin);
  44 }
  45
  46 static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
  47 {
  48         spin_lock(&spl->spin);
  49         list_del(list);
  50         spin_unlock(&spl->spin);
  51 }
  52
  53 static inline void au_spl_del_rcu(struct list_head *list,
  54                                   struct au_splhead *spl)
  55 {
  56         spin_lock(&spl->spin);
  57         list_del_rcu(list);
  58         spin_unlock(&spl->spin);
  59 }
  60 #endif
  61
  62 /* ---------------------------------------------------------------------- */
  63
  64 struct au_sphlhead {
  65         spinlock_t              spin;
  66         struct hlist_head       head;
  67 };
  68
  69 static inline void au_sphl_init(struct au_sphlhead *sphl)
  70 {
  71         spin_lock_init(&sphl->spin);
  72         INIT_HLIST_HEAD(&sphl->head);
  73 }
  74
  75 static inline void au_sphl_add(struct hlist_node *hlist,
  76                                struct au_sphlhead *sphl)
  77 {
  78         spin_lock(&sphl->spin);
  79         hlist_add_head(hlist, &sphl->head);
  80         spin_unlock(&sphl->spin);
  81 }
  82
  83 static inline void au_sphl_del(struct hlist_node *hlist,
  84                                struct au_sphlhead *sphl)
  85 {
  86         spin_lock(&sphl->spin);
  87         hlist_del(hlist);
  88         spin_unlock(&sphl->spin);
  89 }
  90
  91 static inline void au_sphl_del_rcu(struct hlist_node *hlist,
  92                                    struct au_sphlhead *sphl)
  93 {
  94         spin_lock(&sphl->spin);
  95         hlist_del_rcu(hlist);
  96         spin_unlock(&sphl->spin);
  97 }
  98
  99 static inline unsigned long au_sphl_count(struct au_sphlhead *sphl)
 100 {
 101         unsigned long cnt;
 102         struct hlist_node *pos;
 103
 104         cnt = 0;
 105         spin_lock(&sphl->spin);
 106         hlist_for_each(pos, &sphl->head)
 107                 cnt++;
 108         spin_unlock(&sphl->spin);
 109         return cnt;
 110 }
 111
 112 #endif /* __KERNEL__ */
 113 #endif /* __AUFS_SPL_H__ */