LXR linux/include/linux/posix

   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
  11#include <linux/bug.h>
  12#include <linux/slab.h>
  13#include <linux/rcupdate.h>
  14#include <uapi/linux/posix_acl.h>
  15
  16struct posix_acl_entry {
  17        short                   e_tag;
  18        unsigned short          e_perm;
  19        union {
  20                kuid_t          e_uid;
  21                kgid_t          e_gid;
  22        };
  23};
  24
  25struct posix_acl {
  26        atomic_t                a_refcount;
  27        struct rcu_head         a_rcu;
  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))
  54                kfree_rcu(acl, a_rcu);
  55}
  56
  57
  58/* posix_acl.c */
  59
  60extern void posix_acl_init(struct posix_acl *, int);
  61extern struct posix_acl *posix_acl_alloc(int, gfp_t);
  62extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
  63extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
  64extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
  65extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
  66extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
  67extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
  68
  69extern struct posix_acl *get_posix_acl(struct inode *, int);
  70extern int set_posix_acl(struct inode *, int, struct posix_acl *);
  71
  72#ifdef CONFIG_FS_POSIX_ACL
  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 **);
  76extern int posix_acl_update_mode(struct inode *, umode_t *, struct posix_acl **);
  77
  78extern int simple_set_acl(struct inode *, struct posix_acl *, int);
  79extern int simple_acl_create(struct inode *, struct inode *);
  80
  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);
  86
  87static inline void cache_no_acl(struct inode *inode)
  88{
  89        inode->i_acl = NULL;
  90        inode->i_default_acl = NULL;
  91}
  92#else
  93static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
  94{
  95        return 0;
  96}
  97
  98#define simple_set_acl          NULL
  99
 100static inline int simple_acl_create(struct inode *dir, struct inode *inode)
 101{
 102        return 0;
 103}
 104static inline void cache_no_acl(struct inode *inode)
 105{
 106}
 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}
 114
 115static inline void forget_all_cached_acls(struct inode *inode)
 116{
 117}
 118#endif /* CONFIG_FS_POSIX_ACL */
 119
 120struct posix_acl *get_acl(struct inode *inode, int type);
 121
 122#endif  /* __LINUX_POSIX_ACL_H */
 123