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