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gerrit-public.fairphone.software / kernel / msm-4.9 / b05538fc21a4c427a89c16f1aaa4f1011f7148d7 / . / include / linux / posix_acl.h
blob: 5a9a739acdd596fa139d04974140737d9f37ee4f [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>
Andreas Gruenbacherbc8bcf32016-09-27 13:03:23 +0200[diff] [blame]14#include <uapi/linux/posix_acl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]15
16struct posix_acl_entry {
17 short e_tag;
18 unsigned short e_perm;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]19 union {
20 kuid_t e_uid;
21 kgid_t e_gid;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]22 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]23};
24
25struct posix_acl {
Jeff Layton6d4e56c2016-07-11 09:10:06 -0400[diff] [blame]26 atomic_t a_refcount;
27 struct rcu_head a_rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]28 unsigned int a_count;
29 struct posix_acl_entry a_entries[0];
30};
31
32#define FOREACH_ACL_ENTRY(pa, acl, pe) \
33 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
34
35
36/*
37 * Duplicate an ACL handle.
38 */
39static inline struct posix_acl *
40posix_acl_dup(struct posix_acl *acl)
41{
42 if (acl)
43 atomic_inc(&acl->a_refcount);
44 return acl;
45}
46
47/*
48 * Free an ACL handle.
49 */
50static inline void
51posix_acl_release(struct posix_acl *acl)
52{
53 if (acl && atomic_dec_and_test(&acl->a_refcount))
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]54 kfree_rcu(acl, a_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]55}
56
57
58/* posix_acl.c */
59
Chuck Leverf61f6da2011-01-21 03:05:38 +0000[diff] [blame]60extern void posix_acl_init(struct posix_acl *, int);
Al Virodd0fc662005-10-07 07:46:04 +0100[diff] [blame]61extern struct posix_acl *posix_acl_alloc(int, gfp_t);
Eric W. Biederman0d4d7172016-06-27 16:04:06 -0500[diff] [blame]62extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]63extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
Al Viro3a5fba12011-07-23 19:01:48 -0400[diff] [blame]64extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
Al Virod6952122011-07-23 18:56:36 -0400[diff] [blame]65extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]66extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]67extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]68
69extern struct posix_acl *get_posix_acl(struct inode *, int);
70extern int set_posix_acl(struct inode *, int, struct posix_acl *);
71
Markus Trippelsdorf641cf4a2009-06-24 22:28:52 +0200[diff] [blame]72#ifdef CONFIG_FS_POSIX_ACL
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]73extern int posix_acl_chmod(struct inode *, umode_t);
74extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
75 struct posix_acl **);
Jan Kara07393102016-09-19 17:39:09 +0200[diff] [blame]76extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]77
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]78extern int simple_set_acl(struct inode *, struct posix_acl *, int);
79extern int simple_acl_create(struct inode *, struct inode *);
80
Andrew Morton0afaa122014-01-21 15:48:42 -0800[diff] [blame]81struct posix_acl *get_cached_acl(struct inode *inode, int type);
82struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
83void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
84void forget_cached_acl(struct inode *inode, int type);
85void forget_all_cached_acls(struct inode *inode);
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]86
87static inline void cache_no_acl(struct inode *inode)
88{
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]89 inode->i_acl = NULL;
90 inode->i_default_acl = NULL;
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]91}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]92#else
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]93static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]94{
95 return 0;
96}
97
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]98#define simple_set_acl NULL
99
100static inline int simple_acl_create(struct inode *dir, struct inode *inode)
101{
102 return 0;
103}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]104static inline void cache_no_acl(struct inode *inode)
105{
106}
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]107
108static inline int posix_acl_create(struct inode *inode, umode_t *mode,
109 struct posix_acl **default_acl, struct posix_acl **acl)
110{
111 *default_acl = *acl = NULL;
112 return 0;
113}
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800[diff] [blame]114
115static inline void forget_all_cached_acls(struct inode *inode)
116{
117}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]118#endif /* CONFIG_FS_POSIX_ACL */
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]119
Christoph Hellwig2982baa2013-12-20 05:16:38 -0800[diff] [blame]120struct posix_acl *get_acl(struct inode *inode, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]121
122#endif /* __LINUX_POSIX_ACL_H */