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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__ */ |