[linux.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 <[email protected]>
 */

#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_palloc_cache: persistent object allocator cache
 * @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;
	struct nilfs_palloc_cache *mi_palloc_cache;
	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,
			    size_t);
struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *,
				   ino_t, gfp_t, size_t);
void nilfs_mdt_destroy(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)

#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 <[email protected]>
	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
db38d5ad	39	* @mi_palloc_cache: persistent object allocator cache
5eb563f5 RK	40	* @mi_blocks_per_group: number of blocks in a group
	41	* @mi_blocks_per_desc_block: number of blocks per descriptor block
	42	*/
	43	struct nilfs_mdt_info {
	44	struct the_nilfs *mi_nilfs;
	45	struct rw_semaphore mi_sem;
	46	struct blockgroup_lock *mi_bgl;
	47	unsigned mi_entry_size;
	48	unsigned mi_first_entry_offset;
	49	unsigned long mi_entries_per_block;
db38d5ad	50	struct nilfs_palloc_cache *mi_palloc_cache;
5eb563f5 RK	51	unsigned long mi_blocks_per_group;
	52	unsigned long mi_blocks_per_desc_block;
	53	};
	54
	55	static inline struct nilfs_mdt_info NILFS_MDT(const struct inode inode)
	56	{
	57	return inode->i_private;
	58	}
	59
	60	static inline struct the_nilfs NILFS_I_NILFS(struct inode inode)
	61	{
	62	struct super_block *sb = inode->i_sb;
	63
	64	return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs;
	65	}
	66
	67	/* Default GFP flags using highmem */
	68	#define NILFS_MDT_GFP (__GFP_WAIT \| __GFP_IO \| __GFP_HIGHMEM)
	69
	70	int nilfs_mdt_get_block(struct inode *, unsigned long, int,
	71	void (init_block)(struct inode ,
	72	struct buffer_head , void ),
	73	struct buffer_head **);
	74	int nilfs_mdt_delete_block(struct inode *, unsigned long);
	75	int nilfs_mdt_forget_block(struct inode *, unsigned long);
	76	int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
	77	int nilfs_mdt_fetch_dirty(struct inode *);
	78
5731e191 RK	79	struct inode nilfs_mdt_new(struct the_nilfs , struct super_block *, ino_t,
5731e191 RK	80	size_t);
5eb563f5	81	struct inode nilfs_mdt_new_common(struct the_nilfs , struct super_block *,
5731e191	82	ino_t, gfp_t, size_t);
5eb563f5	83	void nilfs_mdt_destroy(struct inode *);
5eb563f5 RK	84	void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
	85	void nilfs_mdt_set_shadow(struct inode , struct inode );
	86
	87
	88	#define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
	89
	90	static inline void nilfs_mdt_mark_dirty(struct inode *inode)
	91	{
	92	if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
	93	set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
	94	}
	95
	96	static inline void nilfs_mdt_clear_dirty(struct inode *inode)
	97	{
	98	clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
	99	}
	100
	101	static inline __u64 nilfs_mdt_cno(struct inode *inode)
	102	{
	103	return NILFS_MDT(inode)->mi_nilfs->ns_cno;
	104	}
	105
	106	#define nilfs_mdt_bgl_lock(inode, bg) \
	107	(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
	108
5eb563f5	109	#endif /* _NILFS_MDT_H */