1 /* SPDX-License-Identifier: GPL-2.0 */
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
12 #include <linux/bug.h>
13 #include <linux/slab.h>
14 #include <linux/rcupdate.h>
15 #include <linux/refcount.h>
16 #include <uapi/linux/posix_acl.h>
17
18 struct posix_acl_entry {
19 short e_tag;
20 unsigned short e_perm;
21 union {
22 kuid_t e_uid;
23 kgid_t e_gid;
24 };
25 };
26
27 struct posix_acl {
28 refcount_t a_refcount;
29 struct rcu_head a_rcu;
30 unsigned int a_count;
31 struct posix_acl_entry a_entries[];
32 };
33
34 #define FOREACH_ACL_ENTRY(pa, acl, pe) \
35 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
36
37
38 /*
39 * Duplicate an ACL handle.
40 */
41 static inline struct posix_acl *
posix_acl_dup(struct posix_acl * acl)42 posix_acl_dup(struct posix_acl *acl)
43 {
44 if (acl)
45 refcount_inc(&acl->a_refcount);
46 return acl;
47 }
48
49 /*
50 * Free an ACL handle.
51 */
52 static inline void
posix_acl_release(struct posix_acl * acl)53 posix_acl_release(struct posix_acl *acl)
54 {
55 if (acl && refcount_dec_and_test(&acl->a_refcount))
56 kfree_rcu(acl, a_rcu);
57 }
58
59
60 /* posix_acl.c */
61
62 extern void posix_acl_init(struct posix_acl *, int);
63 extern struct posix_acl *posix_acl_alloc(int, gfp_t);
64 extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
65 extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
66 extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
67 extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
68 extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
69 extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
70
71 extern struct posix_acl *get_posix_acl(struct inode *, int);
72 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
73
74 #ifdef CONFIG_FS_POSIX_ACL
75 extern int posix_acl_chmod(struct inode *, umode_t);
76 extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
77 struct posix_acl **);
78 extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
79
80 extern int simple_set_acl(struct inode *, struct posix_acl *, int);
81 extern int simple_acl_create(struct inode *, struct inode *);
82
83 struct posix_acl *get_cached_acl(struct inode *inode, int type);
84 struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
85 void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
86 void forget_cached_acl(struct inode *inode, int type);
87 void forget_all_cached_acls(struct inode *inode);
88
cache_no_acl(struct inode * inode)89 static inline void cache_no_acl(struct inode *inode)
90 {
91 inode->i_acl = NULL;
92 inode->i_default_acl = NULL;
93 }
94 #else
posix_acl_chmod(struct inode * inode,umode_t mode)95 static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
96 {
97 return 0;
98 }
99
100 #define simple_set_acl NULL
101
simple_acl_create(struct inode * dir,struct inode * inode)102 static inline int simple_acl_create(struct inode *dir, struct inode *inode)
103 {
104 return 0;
105 }
cache_no_acl(struct inode * inode)106 static inline void cache_no_acl(struct inode *inode)
107 {
108 }
109
posix_acl_create(struct inode * inode,umode_t * mode,struct posix_acl ** default_acl,struct posix_acl ** acl)110 static inline int posix_acl_create(struct inode *inode, umode_t *mode,
111 struct posix_acl **default_acl, struct posix_acl **acl)
112 {
113 *default_acl = *acl = NULL;
114 return 0;
115 }
116
forget_all_cached_acls(struct inode * inode)117 static inline void forget_all_cached_acls(struct inode *inode)
118 {
119 }
120 #endif /* CONFIG_FS_POSIX_ACL */
121
122 struct posix_acl *get_acl(struct inode *inode, int type);
123
124 #endif /* __LINUX_POSIX_ACL_H */
125