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gerrit-public.fairphone.software / kernel / msm-4.19 / 648b949b787095aa7e34e5f9c209c9f85a5f194c / . / include / linux / posix_acl.h
blob: 540595a321a762d305bea8bb1ffa6586a6df0585 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
Paul Gortmaker187f1882011-11-23 20:12:59 -0500[diff] [blame]12#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]13#include <linux/slab.h>
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]14#include <linux/rcupdate.h>
Elena Reshetova66717262017-11-29 13:19:31 +0200[diff] [blame]15#include <linux/refcount.h>
Andreas Gruenbacherbc8bcf32016-09-27 13:03:23 +0200[diff] [blame]16#include <uapi/linux/posix_acl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]17
18struct posix_acl_entry {
19 short e_tag;
20 unsigned short e_perm;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]21 union {
22 kuid_t e_uid;
23 kgid_t e_gid;
Eric W. Biederman2f6f0652012-02-07 18:52:57 -0800[diff] [blame]24 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]25};
26
27struct posix_acl {
Elena Reshetova66717262017-11-29 13:19:31 +0200[diff] [blame]28 refcount_t a_refcount;
Jeff Layton6d4e56c2016-07-11 09:10:06 -0400[diff] [blame]29 struct rcu_head a_rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]30 unsigned int a_count;
31 struct posix_acl_entry a_entries[0];
32};
33
34#define FOREACH_ACL_ENTRY(pa, acl, pe) \
35 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
36
37
38/*
39 * Duplicate an ACL handle.
40 */
41static inline struct posix_acl *
42posix_acl_dup(struct posix_acl *acl)
43{
44 if (acl)
Elena Reshetova66717262017-11-29 13:19:31 +0200[diff] [blame]45 refcount_inc(&acl->a_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]46 return acl;
47}
48
49/*
50 * Free an ACL handle.
51 */
52static inline void
53posix_acl_release(struct posix_acl *acl)
54{
Elena Reshetova66717262017-11-29 13:19:31 +0200[diff] [blame]55 if (acl && refcount_dec_and_test(&acl->a_refcount))
Al Viro35678662011-08-02 21:32:13 -0400[diff] [blame]56 kfree_rcu(acl, a_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]57}
58
59
60/* posix_acl.c */
61
Chuck Leverf61f6da2011-01-21 03:05:38 +0000[diff] [blame]62extern void posix_acl_init(struct posix_acl *, int);
Al Virodd0fc662005-10-07 07:46:04 +0100[diff] [blame]63extern struct posix_acl *posix_acl_alloc(int, gfp_t);
Eric W. Biederman0d4d7172016-06-27 16:04:06 -0500[diff] [blame]64extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]65extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
Al Viro3a5fba12011-07-23 19:01:48 -0400[diff] [blame]66extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
Al Virod6952122011-07-23 18:56:36 -0400[diff] [blame]67extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]68extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]69extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]70
71extern struct posix_acl *get_posix_acl(struct inode *, int);
72extern int set_posix_acl(struct inode *, int, struct posix_acl *);
73
Markus Trippelsdorf641cf4a2009-06-24 22:28:52 +0200[diff] [blame]74#ifdef CONFIG_FS_POSIX_ACL
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]75extern int posix_acl_chmod(struct inode *, umode_t);
76extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
77 struct posix_acl **);
Jan Kara07393102016-09-19 17:39:09 +0200[diff] [blame]78extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]79
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]80extern int simple_set_acl(struct inode *, struct posix_acl *, int);
81extern int simple_acl_create(struct inode *, struct inode *);
82
Andrew Morton0afaa122014-01-21 15:48:42 -0800[diff] [blame]83struct posix_acl *get_cached_acl(struct inode *inode, int type);
84struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
85void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
86void forget_cached_acl(struct inode *inode, int type);
87void forget_all_cached_acls(struct inode *inode);
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]88
89static inline void cache_no_acl(struct inode *inode)
90{
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]91 inode->i_acl = NULL;
92 inode->i_default_acl = NULL;
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]93}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]94#else
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]95static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]96{
97 return 0;
98}
99
Christoph Hellwigfeda8212013-12-20 05:16:54 -0800[diff] [blame]100#define simple_set_acl NULL
101
102static inline int simple_acl_create(struct inode *dir, struct inode *inode)
103{
104 return 0;
105}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]106static inline void cache_no_acl(struct inode *inode)
107{
108}
Christoph Hellwig37bc1532013-12-20 05:16:42 -0800[diff] [blame]109
110static inline int posix_acl_create(struct inode *inode, umode_t *mode,
111 struct posix_acl **default_acl, struct posix_acl **acl)
112{
113 *default_acl = *acl = NULL;
114 return 0;
115}
Christoph Hellwig013cdf12013-12-20 05:16:53 -0800[diff] [blame]116
117static inline void forget_all_cached_acls(struct inode *inode)
118{
119}
Christoph Hellwig5bf32582013-12-20 05:16:41 -0800[diff] [blame]120#endif /* CONFIG_FS_POSIX_ACL */
Al Viro72c04902009-06-24 16:58:48 -0400[diff] [blame]121
Christoph Hellwig2982baa2013-12-20 05:16:38 -0800[diff] [blame]122struct posix_acl *get_acl(struct inode *inode, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]123
124#endif /* __LINUX_POSIX_ACL_H */