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 | posix_acl_dup(struct posix_acl *acl) |
45 | { |
46 | if (acl) |
47 | refcount_inc(r: &acl->a_refcount); |
48 | return acl; |
49 | } |
50 | |
51 | /* |
52 | * Free an ACL handle. |
53 | */ |
54 | static inline void |
55 | posix_acl_release(struct posix_acl *acl) |
56 | { |
57 | if (acl && refcount_dec_and_test(r: &acl->a_refcount)) |
58 | kfree_rcu(acl, a_rcu); |
59 | } |
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 | inode->i_acl = NULL; |
100 | inode->i_default_acl = NULL; |
101 | } |
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 */ |
168 | |