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      1 /*
      2   File: linux/posix_acl.h
      3 
      4   (C) 2002 Andreas Gruenbacher, <a.gruenbacher (at) computer.org>
      5 */
      6 
      7 
      8 #ifndef __LINUX_POSIX_ACL_H
      9 #define __LINUX_POSIX_ACL_H
     10 
     11 #include <linux/slab.h>
     12 
     13 #define ACL_UNDEFINED_ID	(-1)
     14 
     15 /* a_type field in acl_user_posix_entry_t */
     16 #define ACL_TYPE_ACCESS		(0x8000)
     17 #define ACL_TYPE_DEFAULT	(0x4000)
     18 
     19 /* e_tag entry in struct posix_acl_entry */
     20 #define ACL_USER_OBJ		(0x01)
     21 #define ACL_USER		(0x02)
     22 #define ACL_GROUP_OBJ		(0x04)
     23 #define ACL_GROUP		(0x08)
     24 #define ACL_MASK		(0x10)
     25 #define ACL_OTHER		(0x20)
     26 
     27 /* permissions in the e_perm field */
     28 #define ACL_READ		(0x04)
     29 #define ACL_WRITE		(0x02)
     30 #define ACL_EXECUTE		(0x01)
     31 //#define ACL_ADD		(0x08)
     32 //#define ACL_DELETE		(0x10)
     33 
     34 struct posix_acl_entry {
     35 	short			e_tag;
     36 	unsigned short		e_perm;
     37 	unsigned int		e_id;
     38 };
     39 
     40 struct posix_acl {
     41 	atomic_t		a_refcount;
     42 	unsigned int		a_count;
     43 	struct posix_acl_entry	a_entries[0];
     44 };
     45 
     46 #define FOREACH_ACL_ENTRY(pa, acl, pe) \
     47 	for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
     48 
     49 
     50 /*
     51  * Duplicate an ACL handle.
     52  */
     53 static inline struct posix_acl *
     54 posix_acl_dup(struct posix_acl *acl)
     55 {
     56 	if (acl)
     57 		atomic_inc(&acl->a_refcount);
     58 	return acl;
     59 }
     60 
     61 /*
     62  * Free an ACL handle.
     63  */
     64 static inline void
     65 posix_acl_release(struct posix_acl *acl)
     66 {
     67 	if (acl && atomic_dec_and_test(&acl->a_refcount))
     68 		kfree(acl);
     69 }
     70 
     71 
     72 /* posix_acl.c */
     73 
     74 extern struct posix_acl *posix_acl_alloc(int, gfp_t);
     75 extern struct posix_acl *posix_acl_clone(const struct posix_acl *, gfp_t);
     76 extern int posix_acl_valid(const struct posix_acl *);
     77 extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
     78 extern struct posix_acl *posix_acl_from_mode(mode_t, gfp_t);
     79 extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *);
     80 extern int posix_acl_create_masq(struct posix_acl *, mode_t *);
     81 extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
     82 
     83 extern struct posix_acl *get_posix_acl(struct inode *, int);
     84 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
     85 
     86 #endif  /* __LINUX_POSIX_ACL_H */
     87