[linux-2.6-block.git] / fs / nilfs2 / mdt.h

/*
 * mdt.h - NILFS meta data file prototype and definitions
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Ryusuke Konishi <ryusuke@osrg.net>
 */

#ifndef _NILFS_MDT_H
#define _NILFS_MDT_H

#include <linux/buffer_head.h>
#include <linux/blockgroup_lock.h>
#include "nilfs.h"
#include "page.h"

/**
 * struct nilfs_mdt_info - on-memory private data of meta data files
 * @mi_nilfs: back pointer to the_nilfs struct
 * @mi_sem: reader/writer semaphore for meta data operations
 * @mi_bgl: per-blockgroup locking
 * @mi_entry_size: size of an entry
 * @mi_first_entry_offset: offset to the first entry
 * @mi_entries_per_block: number of entries in a block
 * @mi_blocks_per_group: number of blocks in a group
 * @mi_blocks_per_desc_block: number of blocks per descriptor block
 */
struct nilfs_mdt_info {
	struct the_nilfs       *mi_nilfs;
	struct rw_semaphore	mi_sem;
	struct blockgroup_lock *mi_bgl;
	unsigned		mi_entry_size;
	unsigned		mi_first_entry_offset;
	unsigned long		mi_entries_per_block;
	unsigned long		mi_blocks_per_group;
	unsigned long		mi_blocks_per_desc_block;
};

static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
{
	return inode->i_private;
}

static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;

	return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs;
}

/* Default GFP flags using highmem */
#define NILFS_MDT_GFP      (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)

int nilfs_mdt_get_block(struct inode *, unsigned long, int,
			void (*init_block)(struct inode *,
					   struct buffer_head *, void *),
			struct buffer_head **);
int nilfs_mdt_delete_block(struct inode *, unsigned long);
int nilfs_mdt_forget_block(struct inode *, unsigned long);
int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
int nilfs_mdt_fetch_dirty(struct inode *);

struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t,
			    gfp_t);
struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *,
				   ino_t, gfp_t);
void nilfs_mdt_destroy(struct inode *);
void nilfs_mdt_clear(struct inode *);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
void nilfs_mdt_set_shadow(struct inode *, struct inode *);


#define nilfs_mdt_mark_buffer_dirty(bh)	nilfs_mark_buffer_dirty(bh)

static inline void nilfs_mdt_mark_dirty(struct inode *inode)
{
	if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
		set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
}

static inline void nilfs_mdt_clear_dirty(struct inode *inode)
{
	clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
}

static inline __u64 nilfs_mdt_cno(struct inode *inode)
{
	return NILFS_MDT(inode)->mi_nilfs->ns_cno;
}

#define nilfs_mdt_bgl_lock(inode, bg) \
	(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)


static inline int
nilfs_mdt_read_inode_direct(struct inode *inode, struct buffer_head *bh,
			    unsigned n)
{
	return nilfs_read_inode_common(
		inode, (struct nilfs_inode *)(bh->b_data + n));
}

static inline void
nilfs_mdt_write_inode_direct(struct inode *inode, struct buffer_head *bh,
			     unsigned n)
{
	nilfs_write_inode_common(
		inode, (struct nilfs_inode *)(bh->b_data + n), 1);
}

#endif /* _NILFS_MDT_H */
Commit	Line	Data
5eb563f5 RK	1	/*
	2	* mdt.h - NILFS meta data file prototype and definitions
	3	*
	4	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Written by Ryusuke Konishi <ryusuke@osrg.net>
	21	*/
	22
	23	#ifndef _NILFS_MDT_H
	24	#define _NILFS_MDT_H
	25
	26	#include <linux/buffer_head.h>
	27	#include <linux/blockgroup_lock.h>
	28	#include "nilfs.h"
	29	#include "page.h"
	30
	31	/**
	32	* struct nilfs_mdt_info - on-memory private data of meta data files
	33	* @mi_nilfs: back pointer to the_nilfs struct
	34	* @mi_sem: reader/writer semaphore for meta data operations
	35	* @mi_bgl: per-blockgroup locking
	36	* @mi_entry_size: size of an entry
	37	* @mi_first_entry_offset: offset to the first entry
	38	* @mi_entries_per_block: number of entries in a block
	39	* @mi_blocks_per_group: number of blocks in a group
	40	* @mi_blocks_per_desc_block: number of blocks per descriptor block
	41	*/
	42	struct nilfs_mdt_info {
	43	struct the_nilfs *mi_nilfs;
	44	struct rw_semaphore mi_sem;
	45	struct blockgroup_lock *mi_bgl;
	46	unsigned mi_entry_size;
	47	unsigned mi_first_entry_offset;
	48	unsigned long mi_entries_per_block;
	49	unsigned long mi_blocks_per_group;
	50	unsigned long mi_blocks_per_desc_block;
	51	};
	52
	53	static inline struct nilfs_mdt_info NILFS_MDT(const struct inode inode)
	54	{
	55	return inode->i_private;
	56	}
	57
	58	static inline struct the_nilfs NILFS_I_NILFS(struct inode inode)
	59	{
	60	struct super_block *sb = inode->i_sb;
	61
	62	return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs;
	63	}
	64
65	/* Default GFP flags using highmem */
66	#define NILFS_MDT_GFP (__GFP_WAIT \| __GFP_IO \| __GFP_HIGHMEM)
67
68	int nilfs_mdt_get_block(struct inode *, unsigned long, int,
69	void (init_block)(struct inode ,
70	struct buffer_head , void ),
71	struct buffer_head **);
72	int nilfs_mdt_delete_block(struct inode *, unsigned long);
73	int nilfs_mdt_forget_block(struct inode *, unsigned long);
74	int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
75	int nilfs_mdt_fetch_dirty(struct inode *);
76
77	struct inode nilfs_mdt_new(struct the_nilfs , struct super_block *, ino_t,
78	gfp_t);
79	struct inode nilfs_mdt_new_common(struct the_nilfs , struct super_block *,
80	ino_t, gfp_t);
81	void nilfs_mdt_destroy(struct inode *);
82	void nilfs_mdt_clear(struct inode *);
83	void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
84	void nilfs_mdt_set_shadow(struct inode , struct inode );
85
86
87	#define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
88
89	static inline void nilfs_mdt_mark_dirty(struct inode *inode)
90	{
91	if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
92	set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
93	}
94
95	static inline void nilfs_mdt_clear_dirty(struct inode *inode)
96	{
97	clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
98	}
99
100	static inline __u64 nilfs_mdt_cno(struct inode *inode)
101	{
102	return NILFS_MDT(inode)->mi_nilfs->ns_cno;
103	}
104
105	#define nilfs_mdt_bgl_lock(inode, bg) \
106	(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
107
108
109	static inline int
110	nilfs_mdt_read_inode_direct(struct inode inode, struct buffer_head bh,
111	unsigned n)
112	{
113	return nilfs_read_inode_common(
114	inode, (struct nilfs_inode *)(bh->b_data + n));
115	}
116
117	static inline void
118	nilfs_mdt_write_inode_direct(struct inode inode, struct buffer_head bh,
119	unsigned n)
120	{
121	nilfs_write_inode_common(
122	inode, (struct nilfs_inode *)(bh->b_data + n), 1);
123	}
124
125	#endif /* _NILFS_MDT_H */