[mirror_ubuntu-bionic-kernel.git] / fs / aufs / dynop.h

/*
 * Copyright (C) 2010-2017 Junjiro R. Okajima
 *
 * This program, aufs is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * dynamically customizable operations (for regular files only)
 */

#ifndef __AUFS_DYNOP_H__
#define __AUFS_DYNOP_H__

#ifdef __KERNEL__

#include <linux/fs.h>
#include <linux/kref.h>

enum {AuDy_AOP, AuDyLast};

struct au_dynop {
	int						dy_type;
	union {
		const void				*dy_hop;
		const struct address_space_operations	*dy_haop;
	};
};

struct au_dykey {
	union {
		struct hlist_bl_node	dk_hnode;
		struct rcu_head		dk_rcu;
	};
	struct au_dynop		dk_op;

	/*
	 * during I am in the branch local array, kref is gotten. when the
	 * branch is removed, kref is put.
	 */
	struct kref		dk_kref;
};

/* stop unioning since their sizes are very different from each other */
struct au_dyaop {
	struct au_dykey			da_key;
	struct address_space_operations	da_op; /* not const */
};

/* ---------------------------------------------------------------------- */

/* dynop.c */
struct au_branch;
void au_dy_put(struct au_dykey *key);
int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
		struct inode *h_inode);
int au_dy_irefresh(struct inode *inode);
void au_dy_arefresh(int do_dio);

void __init au_dy_init(void);
void au_dy_fin(void);

#endif /* __KERNEL__ */
#endif /* __AUFS_DYNOP_H__ */
Commit	Line	Data
c088e31d SF	1	/*
	2	* Copyright (C) 2010-2017 Junjiro R. Okajima
	3	*
	4	* This program, aufs is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	/*
	19	* dynamically customizable operations (for regular files only)
	20	*/
	21
	22	#ifndef __AUFS_DYNOP_H__
	23	#define __AUFS_DYNOP_H__
	24
	25	#ifdef __KERNEL__
	26
	27	#include <linux/fs.h>
	28	#include <linux/kref.h>
	29
	30	enum {AuDy_AOP, AuDyLast};
	31
	32	struct au_dynop {
	33	int dy_type;
	34	union {
	35	const void *dy_hop;
	36	const struct address_space_operations *dy_haop;
	37	};
	38	};
	39
	40	struct au_dykey {
	41	union {
	42	struct hlist_bl_node dk_hnode;
	43	struct rcu_head dk_rcu;
	44	};
	45	struct au_dynop dk_op;
	46
	47	/*
	48	* during I am in the branch local array, kref is gotten. when the
	49	* branch is removed, kref is put.
	50	*/
	51	struct kref dk_kref;
	52	};
	53
	54	/* stop unioning since their sizes are very different from each other */
	55	struct au_dyaop {
	56	struct au_dykey da_key;
	57	struct address_space_operations da_op; /* not const */
	58	};
	59
	60	/* ---------------------------------------------------------------------- */
	61
	62	/* dynop.c */
	63	struct au_branch;
	64	void au_dy_put(struct au_dykey *key);
65	int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
66	struct inode *h_inode);
67	int au_dy_irefresh(struct inode *inode);
68	void au_dy_arefresh(int do_dio);
69
70	void __init au_dy_init(void);
71	void au_dy_fin(void);
72
73	#endif /* __KERNEL__ */
74	#endif /* __AUFS_DYNOP_H__ */