[mirror_ubuntu-bionic-kernel.git] / include / linux / posix_acl.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
  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>
#include <uapi/linux/posix_acl.h>

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

struct posix_acl {
	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(struct user_namespace *, 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 posix_acl_update_mode(struct inode *, umode_t *, 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 *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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	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
187f1882	12	#include <linux/bug.h>
1da177e4	13	#include <linux/slab.h>
3567866b	14	#include <linux/rcupdate.h>
bc8bcf3b	15	#include <uapi/linux/posix_acl.h>
1da177e4 LT	16
	17	struct posix_acl_entry {
	18	short e_tag;
	19	unsigned short e_perm;
2f6f0654 EB	20	union {
	21	kuid_t e_uid;
	22	kgid_t e_gid;
2f6f0654	23	};
1da177e4 LT	24	};
	25
	26	struct posix_acl {
6d4e56ce JL	27	atomic_t a_refcount;
6d4e56ce JL	28	struct rcu_head a_rcu;
1da177e4 LT	29	unsigned int a_count;
	30	struct posix_acl_entry a_entries[0];
	31	};
	32
	33	#define FOREACH_ACL_ENTRY(pa, acl, pe) \
	34	for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
	35
	36
	37	/*
	38	* Duplicate an ACL handle.
	39	*/
	40	static inline struct posix_acl *
	41	posix_acl_dup(struct posix_acl *acl)
	42	{
	43	if (acl)
	44	atomic_inc(&acl->a_refcount);
	45	return acl;
	46	}
	47
	48	/*
	49	* Free an ACL handle.
	50	*/
	51	static inline void
	52	posix_acl_release(struct posix_acl *acl)
	53	{
	54	if (acl && atomic_dec_and_test(&acl->a_refcount))
3567866b	55	kfree_rcu(acl, a_rcu);
1da177e4 LT	56	}
	57
	58
	59	/* posix_acl.c */
	60
f61f6da0	61	extern void posix_acl_init(struct posix_acl *, int);
dd0fc66f	62	extern struct posix_acl *posix_acl_alloc(int, gfp_t);
0d4d717f	63	extern int posix_acl_valid(struct user_namespace , const struct posix_acl );
1da177e4	64	extern int posix_acl_permission(struct inode , const struct posix_acl , int);
3a5fba19	65	extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
d6952123	66	extern int posix_acl_equiv_mode(const struct posix_acl , umode_t );
37bc1539	67	extern int __posix_acl_create(struct posix_acl *, gfp_t, umode_t );
5bf3258f	68	extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t);
1da177e4 LT	69
	70	extern struct posix_acl get_posix_acl(struct inode , int);
	71	extern int set_posix_acl(struct inode , int, struct posix_acl );
	72
641cf4a6	73	#ifdef CONFIG_FS_POSIX_ACL
37bc1539 CH	74	extern int posix_acl_chmod(struct inode *, umode_t);
	75	extern int posix_acl_create(struct inode , umode_t , struct posix_acl **,
	76	struct posix_acl **);
07393101	77	extern int posix_acl_update_mode(struct inode , umode_t , struct posix_acl **);
5bf3258f	78
feda821e CH	79	extern int simple_set_acl(struct inode , struct posix_acl , int);
	80	extern int simple_acl_create(struct inode , struct inode );
	81
0afaa120 AM	82	struct posix_acl get_cached_acl(struct inode inode, int type);
	83	struct posix_acl get_cached_acl_rcu(struct inode inode, int type);
	84	void set_cached_acl(struct inode inode, int type, struct posix_acl acl);
	85	void forget_cached_acl(struct inode *inode, int type);
	86	void forget_all_cached_acls(struct inode *inode);
72c04902 AV	87
	88	static inline void cache_no_acl(struct inode *inode)
	89	{
72c04902 AV	90	inode->i_acl = NULL;
72c04902 AV	91	inode->i_default_acl = NULL;
72c04902	92	}
5bf3258f	93	#else
37bc1539	94	static inline int posix_acl_chmod(struct inode *inode, umode_t mode)
5bf3258f CH	95	{
	96	return 0;
	97	}
	98
feda821e CH	99	#define simple_set_acl NULL
	100
	101	static inline int simple_acl_create(struct inode dir, struct inode inode)
	102	{
	103	return 0;
	104	}
5bf3258f CH	105	static inline void cache_no_acl(struct inode *inode)
	106	{
	107	}
37bc1539 CH	108
	109	static inline int posix_acl_create(struct inode inode, umode_t mode,
	110	struct posix_acl default_acl, struct posix_acl acl)
	111	{
	112	default_acl = acl = NULL;
	113	return 0;
	114	}
013cdf10 CH	115
	116	static inline void forget_all_cached_acls(struct inode *inode)
	117	{
	118	}
5bf3258f	119	#endif /* CONFIG_FS_POSIX_ACL */
72c04902	120
2982baa2	121	struct posix_acl get_acl(struct inode inode, int type);
72c04902	122
1da177e4	123	#endif /* __LINUX_POSIX_ACL_H */