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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | File: linux/posix_acl.h | |
4 | ||
5 | (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org> | |
6 | */ | |
7 | ||
8 | ||
9 | #ifndef __LINUX_POSIX_ACL_H | |
10 | #define __LINUX_POSIX_ACL_H | |
11 | ||
187f1882 | 12 | #include <linux/bug.h> |
1da177e4 | 13 | #include <linux/slab.h> |
3567866b | 14 | #include <linux/rcupdate.h> |
bc8bcf3b | 15 | #include <uapi/linux/posix_acl.h> |
1da177e4 LT |
16 | |
17 | struct posix_acl_entry { | |
18 | short e_tag; | |
19 | unsigned short e_perm; | |
2f6f0654 EB |
20 | union { |
21 | kuid_t e_uid; | |
22 | kgid_t e_gid; | |
2f6f0654 | 23 | }; |
1da177e4 LT |
24 | }; |
25 | ||
26 | struct posix_acl { | |
6d4e56ce JL |
27 | atomic_t a_refcount; |
28 | struct rcu_head a_rcu; | |
1da177e4 LT |
29 | unsigned int a_count; |
30 | struct posix_acl_entry a_entries[0]; | |
31 | }; | |
32 | ||
33 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ | |
34 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) | |
35 | ||
36 | ||
37 | /* | |
38 | * Duplicate an ACL handle. | |
39 | */ | |
40 | static inline struct posix_acl * | |
41 | posix_acl_dup(struct posix_acl *acl) | |
42 | { | |
43 | if (acl) | |
44 | atomic_inc(&acl->a_refcount); | |
45 | return acl; | |
46 | } | |
47 | ||
48 | /* | |
49 | * Free an ACL handle. | |
50 | */ | |
51 | static inline void | |
52 | posix_acl_release(struct posix_acl *acl) | |
53 | { | |
54 | if (acl && atomic_dec_and_test(&acl->a_refcount)) | |
3567866b | 55 | kfree_rcu(acl, a_rcu); |
1da177e4 LT |
56 | } |
57 | ||
58 | ||
59 | /* posix_acl.c */ | |
60 | ||
f61f6da0 | 61 | extern void posix_acl_init(struct posix_acl *, int); |
dd0fc66f | 62 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
0d4d717f | 63 | extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *); |
1da177e4 | 64 | extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); |
3a5fba19 | 65 | extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); |
d6952123 | 66 | extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *); |
37bc1539 | 67 | extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *); |
5bf3258f | 68 | extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); |
1da177e4 LT |
69 | |
70 | extern struct posix_acl *get_posix_acl(struct inode *, int); | |
71 | extern int set_posix_acl(struct inode *, int, struct posix_acl *); | |
72 | ||
641cf4a6 | 73 | #ifdef CONFIG_FS_POSIX_ACL |
37bc1539 CH |
74 | extern int posix_acl_chmod(struct inode *, umode_t); |
75 | extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, | |
76 | struct posix_acl **); | |
07393101 | 77 | extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **); |
5bf3258f | 78 | |
feda821e CH |
79 | extern int simple_set_acl(struct inode *, struct posix_acl *, int); |
80 | extern int simple_acl_create(struct inode *, struct inode *); | |
81 | ||
0afaa120 AM |
82 | struct posix_acl *get_cached_acl(struct inode *inode, int type); |
83 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); | |
84 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); | |
85 | void forget_cached_acl(struct inode *inode, int type); | |
86 | void forget_all_cached_acls(struct inode *inode); | |
72c04902 AV |
87 | |
88 | static inline void cache_no_acl(struct inode *inode) | |
89 | { | |
72c04902 AV |
90 | inode->i_acl = NULL; |
91 | inode->i_default_acl = NULL; | |
72c04902 | 92 | } |
5bf3258f | 93 | #else |
37bc1539 | 94 | static inline int posix_acl_chmod(struct inode *inode, umode_t mode) |
5bf3258f CH |
95 | { |
96 | return 0; | |
97 | } | |
98 | ||
feda821e CH |
99 | #define simple_set_acl NULL |
100 | ||
101 | static inline int simple_acl_create(struct inode *dir, struct inode *inode) | |
102 | { | |
103 | return 0; | |
104 | } | |
5bf3258f CH |
105 | static inline void cache_no_acl(struct inode *inode) |
106 | { | |
107 | } | |
37bc1539 CH |
108 | |
109 | static inline int posix_acl_create(struct inode *inode, umode_t *mode, | |
110 | struct posix_acl **default_acl, struct posix_acl **acl) | |
111 | { | |
112 | *default_acl = *acl = NULL; | |
113 | return 0; | |
114 | } | |
013cdf10 CH |
115 | |
116 | static inline void forget_all_cached_acls(struct inode *inode) | |
117 | { | |
118 | } | |
5bf3258f | 119 | #endif /* CONFIG_FS_POSIX_ACL */ |
72c04902 | 120 | |
2982baa2 | 121 | struct posix_acl *get_acl(struct inode *inode, int type); |
72c04902 | 122 | |
1da177e4 | 123 | #endif /* __LINUX_POSIX_ACL_H */ |