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e14748e8 SF |
1 | /* |
2 | * Copyright (C) 2010-2016 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 | * dynamically customizable operations (for regular files only) | |
20 | */ | |
21 | ||
22 | #ifndef __AUFS_DYNOP_H__ | |
23 | #define __AUFS_DYNOP_H__ | |
24 | ||
25 | #ifdef __KERNEL__ | |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/kref.h> | |
29 | ||
30 | enum {AuDy_AOP, AuDyLast}; | |
31 | ||
32 | struct au_dynop { | |
33 | int dy_type; | |
34 | union { | |
35 | const void *dy_hop; | |
36 | const struct address_space_operations *dy_haop; | |
37 | }; | |
38 | }; | |
39 | ||
40 | struct au_dykey { | |
41 | union { | |
42 | struct hlist_node dk_hnode; | |
43 | struct rcu_head dk_rcu; | |
44 | }; | |
45 | struct au_dynop dk_op; | |
46 | ||
47 | /* | |
48 | * during I am in the branch local array, kref is gotten. when the | |
49 | * branch is removed, kref is put. | |
50 | */ | |
51 | struct kref dk_kref; | |
52 | }; | |
53 | ||
54 | /* stop unioning since their sizes are very different from each other */ | |
55 | struct au_dyaop { | |
56 | struct au_dykey da_key; | |
57 | struct address_space_operations da_op; /* not const */ | |
58 | }; | |
59 | ||
60 | /* ---------------------------------------------------------------------- */ | |
61 | ||
62 | /* dynop.c */ | |
63 | struct au_branch; | |
64 | void au_dy_put(struct au_dykey *key); | |
65 | int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
66 | struct inode *h_inode); | |
67 | int au_dy_irefresh(struct inode *inode); | |
68 | void au_dy_arefresh(int do_dio); | |
69 | ||
70 | void __init au_dy_init(void); | |
71 | void au_dy_fin(void); | |
72 | ||
73 | #endif /* __KERNEL__ */ | |
74 | #endif /* __AUFS_DYNOP_H__ */ |