Commit | Line | Data |
---|---|---|
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> |
66717260 | 15 | #include <linux/refcount.h> |
bc8bcf3b | 16 | #include <uapi/linux/posix_acl.h> |
1da177e4 | 17 | |
47291baa CB |
18 | struct user_namespace; |
19 | ||
1da177e4 LT |
20 | struct posix_acl_entry { |
21 | short e_tag; | |
22 | unsigned short e_perm; | |
2f6f0654 EB |
23 | union { |
24 | kuid_t e_uid; | |
25 | kgid_t e_gid; | |
2f6f0654 | 26 | }; |
1da177e4 LT |
27 | }; |
28 | ||
29 | struct posix_acl { | |
66717260 | 30 | refcount_t a_refcount; |
6d4e56ce | 31 | struct rcu_head a_rcu; |
1da177e4 | 32 | unsigned int a_count; |
70f1451e | 33 | struct posix_acl_entry a_entries[]; |
1da177e4 LT |
34 | }; |
35 | ||
36 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ | |
37 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) | |
38 | ||
39 | ||
40 | /* | |
41 | * Duplicate an ACL handle. | |
42 | */ | |
43 | static inline struct posix_acl * | |
44 | posix_acl_dup(struct posix_acl *acl) | |
45 | { | |
46 | if (acl) | |
66717260 | 47 | refcount_inc(&acl->a_refcount); |
1da177e4 LT |
48 | return acl; |
49 | } | |
50 | ||
51 | /* | |
52 | * Free an ACL handle. | |
53 | */ | |
54 | static inline void | |
55 | posix_acl_release(struct posix_acl *acl) | |
56 | { | |
66717260 | 57 | if (acl && refcount_dec_and_test(&acl->a_refcount)) |
3567866b | 58 | kfree_rcu(acl, a_rcu); |
1da177e4 LT |
59 | } |
60 | ||
61 | ||
62 | /* posix_acl.c */ | |
63 | ||
f61f6da0 | 64 | extern void posix_acl_init(struct posix_acl *, int); |
dd0fc66f | 65 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
3a5fba19 | 66 | extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); |
d6952123 | 67 | extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *); |
37bc1539 | 68 | extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *); |
5bf3258f | 69 | extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); |
1da177e4 LT |
70 | |
71 | extern struct posix_acl *get_posix_acl(struct inode *, int); | |
e65ce2a5 CB |
72 | extern int set_posix_acl(struct user_namespace *, struct inode *, int, |
73 | struct posix_acl *); | |
1da177e4 | 74 | |
332f606b | 75 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); |
8043bffd | 76 | struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags); |
332f606b | 77 | |
641cf4a6 | 78 | #ifdef CONFIG_FS_POSIX_ACL |
e65ce2a5 | 79 | int posix_acl_chmod(struct user_namespace *, struct inode *, umode_t); |
37bc1539 CH |
80 | extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, |
81 | struct posix_acl **); | |
e65ce2a5 CB |
82 | int posix_acl_update_mode(struct user_namespace *, struct inode *, umode_t *, |
83 | struct posix_acl **); | |
5bf3258f | 84 | |
549c7297 CB |
85 | extern int simple_set_acl(struct user_namespace *, struct inode *, |
86 | struct posix_acl *, int); | |
feda821e CH |
87 | extern int simple_acl_create(struct inode *, struct inode *); |
88 | ||
0afaa120 | 89 | struct posix_acl *get_cached_acl(struct inode *inode, int type); |
0afaa120 AM |
90 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); |
91 | void forget_cached_acl(struct inode *inode, int type); | |
92 | void forget_all_cached_acls(struct inode *inode); | |
47291baa CB |
93 | int posix_acl_valid(struct user_namespace *, const struct posix_acl *); |
94 | int posix_acl_permission(struct user_namespace *, struct inode *, | |
95 | const struct posix_acl *, int); | |
72c04902 AV |
96 | |
97 | static inline void cache_no_acl(struct inode *inode) | |
98 | { | |
72c04902 AV |
99 | inode->i_acl = NULL; |
100 | inode->i_default_acl = NULL; | |
72c04902 | 101 | } |
5bf3258f | 102 | #else |
e65ce2a5 CB |
103 | static inline int posix_acl_chmod(struct user_namespace *mnt_userns, |
104 | struct inode *inode, umode_t mode) | |
5bf3258f CH |
105 | { |
106 | return 0; | |
107 | } | |
108 | ||
feda821e CH |
109 | #define simple_set_acl NULL |
110 | ||
111 | static inline int simple_acl_create(struct inode *dir, struct inode *inode) | |
112 | { | |
113 | return 0; | |
114 | } | |
5bf3258f CH |
115 | static inline void cache_no_acl(struct inode *inode) |
116 | { | |
117 | } | |
37bc1539 CH |
118 | |
119 | static inline int posix_acl_create(struct inode *inode, umode_t *mode, | |
120 | struct posix_acl **default_acl, struct posix_acl **acl) | |
121 | { | |
122 | *default_acl = *acl = NULL; | |
123 | return 0; | |
124 | } | |
013cdf10 CH |
125 | |
126 | static inline void forget_all_cached_acls(struct inode *inode) | |
127 | { | |
128 | } | |
5bf3258f | 129 | #endif /* CONFIG_FS_POSIX_ACL */ |
72c04902 | 130 | |
2982baa2 | 131 | struct posix_acl *get_acl(struct inode *inode, int type); |
72c04902 | 132 | |
1da177e4 | 133 | #endif /* __LINUX_POSIX_ACL_H */ |