[linux-2.6-block.git] / include / linux / posix_acl.h

/*
  File: linux/posix_acl.h

  (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/


#ifndef __LINUX_POSIX_ACL_H
#define __LINUX_POSIX_ACL_H

#include <linux/bug.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>

#define ACL_UNDEFINED_ID	(-1)

/* a_type field in acl_user_posix_entry_t */
#define ACL_TYPE_ACCESS		(0x8000)
#define ACL_TYPE_DEFAULT	(0x4000)

/* e_tag entry in struct posix_acl_entry */
#define ACL_USER_OBJ		(0x01)
#define ACL_USER		(0x02)
#define ACL_GROUP_OBJ		(0x04)
#define ACL_GROUP		(0x08)
#define ACL_MASK		(0x10)
#define ACL_OTHER		(0x20)

/* permissions in the e_perm field */
#define ACL_READ		(0x04)
#define ACL_WRITE		(0x02)
#define ACL_EXECUTE		(0x01)
//#define ACL_ADD		(0x08)
//#define ACL_DELETE		(0x10)

struct posix_acl_entry {
	short			e_tag;
	unsigned short		e_perm;
	union {
		kuid_t		e_uid;
		kgid_t		e_gid;
	};
};

struct posix_acl {
	union {
		atomic_t		a_refcount;
		struct rcu_head		a_rcu;
	};
	unsigned int		a_count;
	struct posix_acl_entry	a_entries[0];
};

#define FOREACH_ACL_ENTRY(pa, acl, pe) \
	for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)


/*
 * Duplicate an ACL handle.
 */
static inline struct posix_acl *
posix_acl_dup(struct posix_acl *acl)
{
	if (acl)
		atomic_inc(&acl->a_refcount);
	return acl;
}

/*
 * Free an ACL handle.
 */
static inline void
posix_acl_release(struct posix_acl *acl)
{
	if (acl && atomic_dec_and_test(&acl->a_refcount))
		kfree_rcu(acl, a_rcu);
}


/* posix_acl.c */

extern void posix_acl_init(struct posix_acl *, int);
extern struct posix_acl *posix_acl_alloc(int, gfp_t);
extern int posix_acl_valid(const struct posix_acl *);
extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);

extern struct posix_acl *get_posix_acl(struct inode *, int);
extern int set_posix_acl(struct inode *, int, struct posix_acl *);

#ifdef CONFIG_FS_POSIX_ACL
extern int posix_acl_chmod(struct inode *, umode_t);
extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **,
		struct posix_acl **);

extern int simple_set_acl(struct inode *, struct posix_acl *, int);
extern int simple_acl_create(struct inode *, struct inode *);

struct posix_acl **acl_by_type(struct inode *inode, int type);
struct posix_acl *get_cached_acl(struct inode *inode, int type);
struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
void forget_cached_acl(struct inode *inode, int type);
void forget_all_cached_acls(struct inode *inode);

static inline void cache_no_acl(struct inode *inode)
{
	inode->i_acl = NULL;
	inode->i_default_acl = NULL;
}
#else
static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
{
	return 0;
}

#define simple_set_acl		NULL

static inline int simple_acl_create(struct inode *dir, struct inode *inode)
{
	return 0;
}
static inline void cache_no_acl(struct inode *inode)
{
}

static inline int posix_acl_create(struct inode *inode, umode_t *mode,
		struct posix_acl **default_acl, struct posix_acl **acl)
{
	*default_acl = *acl = NULL;
	return 0;
}

static inline void forget_all_cached_acls(struct inode *inode)
{
}
#endif /* CONFIG_FS_POSIX_ACL */

struct posix_acl *get_acl(struct inode *inode, int type);

#endif  /* __LINUX_POSIX_ACL_H */
Commit	Line	Data
1da177e4 LT	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
187f1882	11	#include <linux/bug.h>
1da177e4	12	#include <linux/slab.h>
3567866b	13	#include <linux/rcupdate.h>
1da177e4 LT	14
	15	#define ACL_UNDEFINED_ID (-1)
	16
	17	/* a_type field in acl_user_posix_entry_t */
	18	#define ACL_TYPE_ACCESS (0x8000)
	19	#define ACL_TYPE_DEFAULT (0x4000)
	20
	21	/* e_tag entry in struct posix_acl_entry */
	22	#define ACL_USER_OBJ (0x01)
	23	#define ACL_USER (0x02)
	24	#define ACL_GROUP_OBJ (0x04)
	25	#define ACL_GROUP (0x08)
	26	#define ACL_MASK (0x10)
	27	#define ACL_OTHER (0x20)
	28
	29	/* permissions in the e_perm field */
	30	#define ACL_READ (0x04)
	31	#define ACL_WRITE (0x02)
	32	#define ACL_EXECUTE (0x01)
	33	//#define ACL_ADD (0x08)
	34	//#define ACL_DELETE (0x10)
	35
	36	struct posix_acl_entry {
	37	short e_tag;
	38	unsigned short e_perm;
2f6f0654 EB	39	union {
	40	kuid_t e_uid;
	41	kgid_t e_gid;
2f6f0654	42	};
1da177e4 LT	43	};
	44
	45	struct posix_acl {
3567866b AV	46	union {
	47	atomic_t a_refcount;
	48	struct rcu_head a_rcu;
	49	};
1da177e4 LT	50	unsigned int a_count;
	51	struct posix_acl_entry a_entries[0];
	52	};
	53
	54	#define FOREACH_ACL_ENTRY(pa, acl, pe) \
	55	for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
	56
	57
	58	/*
	59	* Duplicate an ACL handle.
	60	*/
	61	static inline struct posix_acl *
	62	posix_acl_dup(struct posix_acl *acl)
	63	{
	64	if (acl)
	65	atomic_inc(&acl->a_refcount);
	66	return acl;
	67	}
	68
	69	/*
	70	* Free an ACL handle.
	71	*/
	72	static inline void
	73	posix_acl_release(struct posix_acl *acl)
	74	{
	75	if (acl && atomic_dec_and_test(&acl->a_refcount))
3567866b	76	kfree_rcu(acl, a_rcu);
1da177e4 LT	77	}
	78
	79
	80	/* posix_acl.c */
	81
f61f6da0	82	extern void posix_acl_init(struct posix_acl *, int);
dd0fc66f	83	extern struct posix_acl *posix_acl_alloc(int, gfp_t);
1da177e4 LT	84	extern int posix_acl_valid(const struct posix_acl *);
1da177e4 LT	85	extern int posix_acl_permission(struct inode , const struct posix_acl , int);
3a5fba19	86	extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
d6952123	87	extern int posix_acl_equiv_mode(const struct posix_acl , umode_t );
37bc1539	88	extern int __posix_acl_create(struct posix_acl *, gfp_t, umode_t );
5bf3258f	89	extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
1da177e4 LT	90
	91	extern struct posix_acl get_posix_acl(struct inode , int);
	92	extern int set_posix_acl(struct inode , int, struct posix_acl );
	93
641cf4a6	94	#ifdef CONFIG_FS_POSIX_ACL
37bc1539 CH	95	extern int posix_acl_chmod(struct inode *, umode_t);
	96	extern int posix_acl_create(struct inode , umode_t , struct posix_acl **,
	97	struct posix_acl **);
5bf3258f	98
feda821e CH	99	extern int simple_set_acl(struct inode , struct posix_acl , int);
	100	extern int simple_acl_create(struct inode , struct inode );
	101
0afaa120 AM	102	struct posix_acl *acl_by_type(struct inode inode, int type);
	103	struct posix_acl get_cached_acl(struct inode inode, int type);
	104	struct posix_acl get_cached_acl_rcu(struct inode inode, int type);
	105	void set_cached_acl(struct inode inode, int type, struct posix_acl acl);
	106	void forget_cached_acl(struct inode *inode, int type);
	107	void forget_all_cached_acls(struct inode *inode);
72c04902 AV	108
	109	static inline void cache_no_acl(struct inode *inode)
	110	{
72c04902 AV	111	inode->i_acl = NULL;
72c04902 AV	112	inode->i_default_acl = NULL;
72c04902	113	}
5bf3258f	114	#else
37bc1539	115	static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
5bf3258f CH	116	{
	117	return 0;
	118	}
	119
feda821e CH	120	#define simple_set_acl NULL
	121
	122	static inline int simple_acl_create(struct inode dir, struct inode inode)
	123	{
	124	return 0;
	125	}
5bf3258f CH	126	static inline void cache_no_acl(struct inode *inode)
	127	{
	128	}
37bc1539 CH	129
	130	static inline int posix_acl_create(struct inode inode, umode_t mode,
	131	struct posix_acl default_acl, struct posix_acl acl)
	132	{
	133	default_acl = acl = NULL;
	134	return 0;
	135	}
013cdf10 CH	136
	137	static inline void forget_all_cached_acls(struct inode *inode)
	138	{
	139	}
5bf3258f	140	#endif /* CONFIG_FS_POSIX_ACL */
72c04902	141
2982baa2	142	struct posix_acl get_acl(struct inode inode, int type);
72c04902	143
1da177e4	144	#endif /* __LINUX_POSIX_ACL_H */