Line data Source code
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 user_namespace;
19 :
20 : struct 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 :
29 : struct 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 : */
43 : static inline struct posix_acl *
44 12478049 : posix_acl_dup(struct posix_acl *acl)
45 : {
46 15258271 : if (acl)
47 3570 : refcount_inc(&acl->a_refcount);
48 2780222 : return acl;
49 : }
50 :
51 : /*
52 : * Free an ACL handle.
53 : */
54 : static inline void
55 61115351 : posix_acl_release(struct posix_acl *acl)
56 : {
57 61115351 : if (acl && refcount_dec_and_test(&acl->a_refcount))
58 1861047 : kfree_rcu(acl, a_rcu);
59 61115206 : }
60 :
61 :
62 : /* posix_acl.c */
63 :
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);
70 :
71 : extern struct posix_acl *get_posix_acl(struct inode *, int);
72 : int set_posix_acl(struct mnt_idmap *, struct dentry *, int,
73 : struct posix_acl *);
74 :
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);
77 :
78 : #ifdef CONFIG_FS_POSIX_ACL
79 : int posix_acl_chmod(struct mnt_idmap *, struct dentry *, umode_t);
80 : extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
81 : struct posix_acl **);
82 : int posix_acl_update_mode(struct mnt_idmap *, struct inode *, umode_t *,
83 : struct posix_acl **);
84 :
85 : int simple_set_acl(struct mnt_idmap *, struct dentry *,
86 : struct posix_acl *, int);
87 : extern int simple_acl_create(struct inode *, struct inode *);
88 :
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 mnt_idmap *, struct inode *,
95 : const struct posix_acl *, int);
96 :
97 : static inline void cache_no_acl(struct inode *inode)
98 : {
99 8274470 : inode->i_acl = NULL;
100 8274470 : inode->i_default_acl = NULL;
101 8274470 : }
102 :
103 : int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
104 : const char *acl_name, struct posix_acl *kacl);
105 : struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
106 : struct dentry *dentry, const char *acl_name);
107 : int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
108 : const char *acl_name);
109 : int posix_acl_listxattr(struct inode *inode, char **buffer,
110 : ssize_t *remaining_size);
111 : #else
112 : static inline int posix_acl_chmod(struct mnt_idmap *idmap,
113 : struct dentry *dentry, umode_t mode)
114 : {
115 : return 0;
116 : }
117 :
118 : #define simple_set_acl NULL
119 :
120 : static inline int simple_acl_create(struct inode *dir, struct inode *inode)
121 : {
122 : return 0;
123 : }
124 : static inline void cache_no_acl(struct inode *inode)
125 : {
126 : }
127 :
128 : static inline int posix_acl_create(struct inode *inode, umode_t *mode,
129 : struct posix_acl **default_acl, struct posix_acl **acl)
130 : {
131 : *default_acl = *acl = NULL;
132 : return 0;
133 : }
134 :
135 : static inline void forget_all_cached_acls(struct inode *inode)
136 : {
137 : }
138 :
139 : static inline int vfs_set_acl(struct mnt_idmap *idmap,
140 : struct dentry *dentry, const char *name,
141 : struct posix_acl *acl)
142 : {
143 : return -EOPNOTSUPP;
144 : }
145 :
146 : static inline struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
147 : struct dentry *dentry,
148 : const char *acl_name)
149 : {
150 : return ERR_PTR(-EOPNOTSUPP);
151 : }
152 :
153 : static inline int vfs_remove_acl(struct mnt_idmap *idmap,
154 : struct dentry *dentry, const char *acl_name)
155 : {
156 : return -EOPNOTSUPP;
157 : }
158 : static inline int posix_acl_listxattr(struct inode *inode, char **buffer,
159 : ssize_t *remaining_size)
160 : {
161 : return 0;
162 : }
163 : #endif /* CONFIG_FS_POSIX_ACL */
164 :
165 : struct posix_acl *get_inode_acl(struct inode *inode, int type);
166 :
167 : #endif /* __LINUX_POSIX_ACL_H */
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