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gerrit-public.fairphone.software / kernel / msm-4.9 / 24aa6b41d4611b14ad0fb89fa0b899ae9ab7005c / . / include / linux / posix_acl.h
blob: 3e96a6a7610338ff8ddd825a21ddc9bc5fe52e8b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 File: linux/posix_acl.h
3
4 (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
5*/
6
7
8#ifndef __LINUX_POSIX_ACL_H
9#define __LINUX_POSIX_ACL_H
10
Paul Gortmaker187f1882011-11-23 20:12:59 -0500[diff] [blame]11#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]12#include <linux/slab.h>
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]13#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]14
15#define ACL_UNDEFINED_ID (-1)
16
17/* a_type field in acl_user_posix_entry_t */
18#define ACL_TYPE_ACCESS (0x8000)
19#define ACL_TYPE_DEFAULT (0x4000)
20
21/* e_tag entry in struct posix_acl_entry */
22#define ACL_USER_OBJ (0x01)
23#define ACL_USER (0x02)
24#define ACL_GROUP_OBJ (0x04)
25#define ACL_GROUP (0x08)
26#define ACL_MASK (0x10)
27#define ACL_OTHER (0x20)
28
29/* permissions in the e_perm field */
30#define ACL_READ (0x04)
31#define ACL_WRITE (0x02)
32#define ACL_EXECUTE (0x01)
33//#define ACL_ADD (0x08)
34//#define ACL_DELETE (0x10)
35
36struct posix_acl_entry {
37 short e_tag;
38 unsigned short e_perm;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]39 union {
40 kuid_t e_uid;
41 kgid_t e_gid;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]42 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]43};
44
45struct posix_acl {
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]46 union {
47 atomic_t a_refcount;
48 struct rcu_head a_rcu;
49 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]50 unsigned int a_count;
51 struct posix_acl_entry a_entries[0];
52};
53
54#define FOREACH_ACL_ENTRY(pa, acl, pe) \
55 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
56
57
58/*
59 * Duplicate an ACL handle.
60 */
61static inline struct posix_acl *
62posix_acl_dup(struct posix_acl *acl)
63{
64 if (acl)
65 atomic_inc(&acl->a_refcount);
66 return acl;
67}
68
69/*
70 * Free an ACL handle.
71 */
72static inline void
73posix_acl_release(struct posix_acl *acl)
74{
75 if (acl && atomic_dec_and_test(&acl->a_refcount))
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]76 kfree_rcu(acl, a_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]77}
78
79
80/* posix_acl.c */
81
Chuck Leverf61f6da2011-01-21 03:05:38 +0000[diff] [blame]82extern void posix_acl_init(struct posix_acl *, int);
Al Virodd0fc662005-10-07 07:46:04 +0100[diff] [blame]83extern struct posix_acl *posix_acl_alloc(int, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]84extern int posix_acl_valid(const struct posix_acl *);
85extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
Al Viro3a5fba12011-07-23 19:01:48 -0400[diff] [blame]86extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
Al Virod6952122011-07-23 18:56:36 -0400[diff] [blame]87extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]88extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]89extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]90
91extern struct posix_acl *get_posix_acl(struct inode *, int);
92extern int set_posix_acl(struct inode *, int, struct posix_acl *);
93
Markus Trippelsdorf641cf4a2009-06-24 22:28:52 +0200[diff] [blame]94#ifdef CONFIG_FS_POSIX_ACL
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]95extern int posix_acl_chmod(struct inode *, umode_t);
96extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
97 struct posix_acl **);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]98
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]99extern int simple_set_acl(struct inode *, struct posix_acl *, int);
100extern int simple_acl_create(struct inode *, struct inode *);
101
Andrew Morton0afaa122014-01-21 15:48:42 -0800[diff] [blame]102struct posix_acl **acl_by_type(struct inode *inode, int type);
103struct posix_acl *get_cached_acl(struct inode *inode, int type);
104struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
105void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
106void forget_cached_acl(struct inode *inode, int type);
107void forget_all_cached_acls(struct inode *inode);
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]108
109static inline void cache_no_acl(struct inode *inode)
110{
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]111 inode->i_acl = NULL;
112 inode->i_default_acl = NULL;
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]113}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]114#else
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]115static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]116{
117 return 0;
118}
119
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]120#define simple_set_acl NULL
121
122static inline int simple_acl_create(struct inode *dir, struct inode *inode)
123{
124 return 0;
125}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]126static inline void cache_no_acl(struct inode *inode)
127{
128}
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]129
130static inline int posix_acl_create(struct inode *inode, umode_t *mode,
131 struct posix_acl **default_acl, struct posix_acl **acl)
132{
133 *default_acl = *acl = NULL;
134 return 0;
135}
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800[diff] [blame]136
137static inline void forget_all_cached_acls(struct inode *inode)
138{
139}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]140#endif /* CONFIG_FS_POSIX_ACL */
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]141
Christoph Hellwig2982baa2013-12-20 05:16:38 -0800[diff] [blame]142struct posix_acl *get_acl(struct inode *inode, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]143
144#endif /* __LINUX_POSIX_ACL_H */