1 /* SPDX-License-Identifier: GPL-2.0 */
3 File: linux/posix_acl.h
5 (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
9 #ifndef __LINUX_POSIX_ACL_H
10 #define __LINUX_POSIX_ACL_H
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>
18 struct user_namespace
;
20 struct posix_acl_entry
{
22 unsigned short e_perm
;
30 refcount_t a_refcount
;
31 struct rcu_head a_rcu
;
33 struct posix_acl_entry a_entries
[];
36 #define FOREACH_ACL_ENTRY(pa, acl, pe) \
37 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
41 * Duplicate an ACL handle.
43 static inline struct posix_acl
*
44 posix_acl_dup(struct posix_acl
*acl
)
47 refcount_inc(&acl
->a_refcount
);
55 posix_acl_release(struct posix_acl
*acl
)
57 if (acl
&& refcount_dec_and_test(&acl
->a_refcount
))
58 kfree_rcu(acl
, a_rcu
);
64 extern void posix_acl_init(struct posix_acl
*, int);
65 extern struct posix_acl
*posix_acl_alloc(int, gfp_t
);
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
);
71 extern struct posix_acl
*get_posix_acl(struct inode
*, int);
72 extern int set_posix_acl(struct user_namespace
*, struct inode
*, int,
75 struct posix_acl
*get_cached_acl_rcu(struct inode
*inode
, int type
);
76 struct posix_acl
*posix_acl_clone(const struct posix_acl
*acl
, gfp_t flags
);
78 #ifdef CONFIG_FS_POSIX_ACL
79 int posix_acl_chmod(struct user_namespace
*, struct inode
*, umode_t
);
80 extern int posix_acl_create(struct inode
*, umode_t
*, struct posix_acl
**,
82 int posix_acl_update_mode(struct user_namespace
*, struct inode
*, umode_t
*,
85 extern int simple_set_acl(struct user_namespace
*, struct inode
*,
86 struct posix_acl
*, int);
87 extern int simple_acl_create(struct inode
*, struct inode
*);
89 struct posix_acl
*get_cached_acl(struct inode
*inode
, int type
);
90 void set_cached_acl(struct inode
*inode
, int type
, struct posix_acl
*acl
);
91 void forget_cached_acl(struct inode
*inode
, int type
);
92 void forget_all_cached_acls(struct inode
*inode
);
93 int posix_acl_valid(struct user_namespace
*, const struct posix_acl
*);
94 int posix_acl_permission(struct user_namespace
*, struct inode
*,
95 const struct posix_acl
*, int);
97 static inline void cache_no_acl(struct inode
*inode
)
100 inode
->i_default_acl
= NULL
;
103 static inline int posix_acl_chmod(struct user_namespace
*mnt_userns
,
104 struct inode
*inode
, umode_t mode
)
109 #define simple_set_acl NULL
111 static inline int simple_acl_create(struct inode
*dir
, struct inode
*inode
)
115 static inline void cache_no_acl(struct inode
*inode
)
119 static inline int posix_acl_create(struct inode
*inode
, umode_t
*mode
,
120 struct posix_acl
**default_acl
, struct posix_acl
**acl
)
122 *default_acl
= *acl
= NULL
;
126 static inline void forget_all_cached_acls(struct inode
*inode
)
129 #endif /* CONFIG_FS_POSIX_ACL */
131 struct posix_acl
*get_acl(struct inode
*inode
, int type
);
133 #endif /* __LINUX_POSIX_ACL_H */