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Linux/include/linux/posix_acl.h

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  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 posix_acl_entry {
 19         short                   e_tag;
 20         unsigned short          e_perm;
 21         union {
 22                 kuid_t          e_uid;
 23                 kgid_t          e_gid;
 24         };
 25 };
 26 
 27 struct posix_acl {
 28         refcount_t              a_refcount;
 29         struct rcu_head         a_rcu;
 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  */
 41 static inline struct posix_acl *
 42 posix_acl_dup(struct posix_acl *acl)
 43 {
 44         if (acl)
 45                 refcount_inc(&acl->a_refcount);
 46         return acl;
 47 }
 48 
 49 /*
 50  * Free an ACL handle.
 51  */
 52 static inline void
 53 posix_acl_release(struct posix_acl *acl)
 54 {
 55         if (acl && refcount_dec_and_test(&acl->a_refcount))
 56                 kfree_rcu(acl, a_rcu);
 57 }
 58 
 59 
 60 /* posix_acl.c */
 61 
 62 extern void posix_acl_init(struct posix_acl *, int);
 63 extern struct posix_acl *posix_acl_alloc(int, gfp_t);
 64 extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
 65 extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
 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 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
 73 
 74 #ifdef CONFIG_FS_POSIX_ACL
 75 extern int posix_acl_chmod(struct inode *, umode_t);
 76 extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
 77                 struct posix_acl **);
 78 extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
 79 
 80 extern int simple_set_acl(struct inode *, struct posix_acl *, int);
 81 extern int simple_acl_create(struct inode *, struct inode *);
 82 
 83 struct posix_acl *get_cached_acl(struct inode *inode, int type);
 84 struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
 85 void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
 86 void forget_cached_acl(struct inode *inode, int type);
 87 void forget_all_cached_acls(struct inode *inode);
 88 
 89 static inline void cache_no_acl(struct inode *inode)
 90 {
 91         inode->i_acl = NULL;
 92         inode->i_default_acl = NULL;
 93 }
 94 #else
 95 static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
 96 {
 97         return 0;
 98 }
 99 
100 #define simple_set_acl          NULL
101 
102 static inline int simple_acl_create(struct inode *dir, struct inode *inode)
103 {
104         return 0;
105 }
106 static inline void cache_no_acl(struct inode *inode)
107 {
108 }
109 
110 static 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 }
116 
117 static inline void forget_all_cached_acls(struct inode *inode)
118 {
119 }
120 #endif /* CONFIG_FS_POSIX_ACL */
121 
122 struct posix_acl *get_acl(struct inode *inode, int type);
123 
124 #endif  /* __LINUX_POSIX_ACL_H */
125 

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