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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 user_namespace;
19
20struct posix_acl_entry {
21 short e_tag;
22 unsigned short e_perm;
23 union {
24 kuid_t e_uid;
25 kgid_t e_gid;
26 };
27};
28
29struct posix_acl {
30 refcount_t a_refcount;
31 struct rcu_head a_rcu;
32 unsigned int a_count;
33 struct posix_acl_entry a_entries[];
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 */
43static inline struct posix_acl *
44posix_acl_dup(struct posix_acl *acl)
45{
46 if (acl)
47 refcount_inc(&acl->a_refcount);
48 return acl;
49}
50
51/*
52 * Free an ACL handle.
53 */
54static inline void
55posix_acl_release(struct posix_acl *acl)
56{
57 if (acl && refcount_dec_and_test(&acl->a_refcount))
58 kfree_rcu(acl, a_rcu);
59}
60
61
62/* posix_acl.c */
63
64extern void posix_acl_init(struct posix_acl *, int);
65extern struct posix_acl *posix_acl_alloc(int, gfp_t);
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);
72int set_posix_acl(struct user_namespace *, struct dentry *, int,
73 struct posix_acl *);
74
75struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
76struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags);
77
78#ifdef CONFIG_FS_POSIX_ACL
79int posix_acl_chmod(struct user_namespace *, struct dentry *, umode_t);
80extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
81 struct posix_acl **);
82int posix_acl_update_mode(struct user_namespace *, struct inode *, umode_t *,
83 struct posix_acl **);
84
85int simple_set_acl(struct user_namespace *, struct dentry *,
86 struct posix_acl *, int);
87extern int simple_acl_create(struct inode *, struct inode *);
88
89struct posix_acl *get_cached_acl(struct inode *inode, int type);
90void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
91void forget_cached_acl(struct inode *inode, int type);
92void forget_all_cached_acls(struct inode *inode);
93int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
94int posix_acl_permission(struct user_namespace *, struct inode *,
95 const struct posix_acl *, int);
96
97static inline void cache_no_acl(struct inode *inode)
98{
99 inode->i_acl = NULL;
100 inode->i_default_acl = NULL;
101}
102
103int vfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
104 const char *acl_name, struct posix_acl *kacl);
105struct posix_acl *vfs_get_acl(struct user_namespace *mnt_userns,
106 struct dentry *dentry, const char *acl_name);
107int vfs_remove_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
108 const char *acl_name);
109#else
110static inline int posix_acl_chmod(struct user_namespace *mnt_userns,
111 struct dentry *dentry, umode_t mode)
112{
113 return 0;
114}
115
116#define simple_set_acl NULL
117
118static inline int simple_acl_create(struct inode *dir, struct inode *inode)
119{
120 return 0;
121}
122static inline void cache_no_acl(struct inode *inode)
123{
124}
125
126static inline int posix_acl_create(struct inode *inode, umode_t *mode,
127 struct posix_acl **default_acl, struct posix_acl **acl)
128{
129 *default_acl = *acl = NULL;
130 return 0;
131}
132
133static inline void forget_all_cached_acls(struct inode *inode)
134{
135}
136
137static inline int vfs_set_acl(struct user_namespace *mnt_userns,
138 struct dentry *dentry, const char *name,
139 struct posix_acl *acl)
140{
141 return -EOPNOTSUPP;
142}
143
144static inline struct posix_acl *vfs_get_acl(struct user_namespace *mnt_userns,
145 struct dentry *dentry,
146 const char *acl_name)
147{
148 return ERR_PTR(-EOPNOTSUPP);
149}
150
151static inline int vfs_remove_acl(struct user_namespace *mnt_userns,
152 struct dentry *dentry, const char *acl_name)
153{
154 return -EOPNOTSUPP;
155}
156#endif /* CONFIG_FS_POSIX_ACL */
157
158struct posix_acl *get_inode_acl(struct inode *inode, int type);
159
160#endif /* __LINUX_POSIX_ACL_H */