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
18struct 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
27struct 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[0];
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 */
41static inline struct posix_acl *
42posix_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 */
52static inline void
53posix_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
62extern void posix_acl_init(struct posix_acl *, int);
63extern struct posix_acl *posix_acl_alloc(int, gfp_t);
64extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
65extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
66extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
67extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
68extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
69extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
70
71extern struct posix_acl *get_posix_acl(struct inode *, int);
72extern int set_posix_acl(struct inode *, int, struct posix_acl *);
73
74#ifdef CONFIG_FS_POSIX_ACL
75extern int posix_acl_chmod(struct inode *, umode_t);
76extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
77 struct posix_acl **);
78extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
79
80extern int simple_set_acl(struct inode *, struct posix_acl *, int);
81extern int simple_acl_create(struct inode *, struct inode *);
82
83struct posix_acl *get_cached_acl(struct inode *inode, int type);
84struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
85void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
86void forget_cached_acl(struct inode *inode, int type);
87void forget_all_cached_acls(struct inode *inode);
88
89static inline void cache_no_acl(struct inode *inode)
90{
91 inode->i_acl = NULL;
92 inode->i_default_acl = NULL;
93}
94#else
95static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
96{
97 return 0;
98}
99
100#define simple_set_acl NULL
101
102static inline int simple_acl_create(struct inode *dir, struct inode *inode)
103{
104 return 0;
105}
106static inline void cache_no_acl(struct inode *inode)
107{
108}
109
110static 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
117static inline void forget_all_cached_acls(struct inode *inode)
118{
119}
120#endif /* CONFIG_FS_POSIX_ACL */
121
122struct posix_acl *get_acl(struct inode *inode, int type);
123
124#endif /* __LINUX_POSIX_ACL_H */
125