Line data Source code
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 :
15 : #define ACL_UNDEFINED_ID (-1)
16 :
17 : /* a_type field in acl_user_posix_entry_t */
18 : #define ACL_TYPE_ACCESS (0x8000)
19 : #define ACL_TYPE_DEFAULT (0x4000)
20 :
21 : /* e_tag entry in struct posix_acl_entry */
22 : #define ACL_USER_OBJ (0x01)
23 : #define ACL_USER (0x02)
24 : #define ACL_GROUP_OBJ (0x04)
25 : #define ACL_GROUP (0x08)
26 : #define ACL_MASK (0x10)
27 : #define ACL_OTHER (0x20)
28 :
29 : /* permissions in the e_perm field */
30 : #define ACL_READ (0x04)
31 : #define ACL_WRITE (0x02)
32 : #define ACL_EXECUTE (0x01)
33 : //#define ACL_ADD (0x08)
34 : //#define ACL_DELETE (0x10)
35 :
36 : struct posix_acl_entry {
37 : short e_tag;
38 : unsigned short e_perm;
39 : union {
40 : kuid_t e_uid;
41 : kgid_t e_gid;
42 : };
43 : };
44 :
45 : struct posix_acl {
46 : union {
47 : atomic_t a_refcount;
48 : struct rcu_head a_rcu;
49 : };
50 : unsigned int a_count;
51 : struct posix_acl_entry a_entries[0];
52 : };
53 :
54 : #define FOREACH_ACL_ENTRY(pa, acl, pe) \
55 : for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
56 :
57 :
58 : /*
59 : * Duplicate an ACL handle.
60 : */
61 : static inline struct posix_acl *
62 : posix_acl_dup(struct posix_acl *acl)
63 : {
64 : if (acl)
65 : atomic_inc(&acl->a_refcount);
66 : return acl;
67 : }
68 :
69 : /*
70 : * Free an ACL handle.
71 : */
72 : static inline void
73 0 : posix_acl_release(struct posix_acl *acl)
74 : {
75 0 : if (acl && atomic_dec_and_test(&acl->a_refcount))
76 0 : kfree_rcu(acl, a_rcu);
77 0 : }
78 :
79 :
80 : /* posix_acl.c */
81 :
82 : extern void posix_acl_init(struct posix_acl *, int);
83 : extern struct posix_acl *posix_acl_alloc(int, gfp_t);
84 : extern int posix_acl_valid(const struct posix_acl *);
85 : extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
86 : extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
87 : extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
88 : extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
89 : extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
90 :
91 : extern struct posix_acl *get_posix_acl(struct inode *, int);
92 : extern int set_posix_acl(struct inode *, int, struct posix_acl *);
93 :
94 : #ifdef CONFIG_FS_POSIX_ACL
95 : extern int posix_acl_chmod(struct inode *, umode_t);
96 : extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
97 : struct posix_acl **);
98 :
99 : extern int simple_set_acl(struct inode *, struct posix_acl *, int);
100 : extern int simple_acl_create(struct inode *, struct inode *);
101 :
102 : struct posix_acl **acl_by_type(struct inode *inode, int type);
103 : struct posix_acl *get_cached_acl(struct inode *inode, int type);
104 : struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
105 : void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
106 : void forget_cached_acl(struct inode *inode, int type);
107 : void forget_all_cached_acls(struct inode *inode);
108 :
109 : static inline void cache_no_acl(struct inode *inode)
110 : {
111 24922 : inode->i_acl = NULL;
112 24922 : inode->i_default_acl = NULL;
113 : }
114 : #else
115 : static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
116 : {
117 : return 0;
118 : }
119 :
120 : #define simple_set_acl NULL
121 :
122 : static inline int simple_acl_create(struct inode *dir, struct inode *inode)
123 : {
124 : return 0;
125 : }
126 : static inline void cache_no_acl(struct inode *inode)
127 : {
128 : }
129 :
130 : static inline int posix_acl_create(struct inode *inode, umode_t *mode,
131 : struct posix_acl **default_acl, struct posix_acl **acl)
132 : {
133 : *default_acl = *acl = NULL;
134 : return 0;
135 : }
136 :
137 : static inline void forget_all_cached_acls(struct inode *inode)
138 : {
139 : }
140 : #endif /* CONFIG_FS_POSIX_ACL */
141 :
142 : struct posix_acl *get_acl(struct inode *inode, int type);
143 :
144 : #endif /* __LINUX_POSIX_ACL_H */
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