projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| e14748e8 SF |
1 | /* |
| 2 | * Copyright (C) 2005-2016 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__ */ |