[deliverable/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 <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_shadow_map {
	struct nilfs_bmap_store bmap_store;
	struct address_space frozen_data;
	struct address_space frozen_btnodes;
	struct list_head frozen_buffers;
};

/**
 * struct nilfs_mdt_info - on-memory private data of meta data files
 * @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_shadow: shadow of bmap and page caches
 * @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 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;
	struct nilfs_shadow_map *mi_shadow;
	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;
}

/* 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 *);

int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);

int nilfs_mdt_setup_shadow_map(struct inode *inode,
			       struct nilfs_shadow_map *shadow);
int nilfs_mdt_save_to_shadow_map(struct inode *inode);
void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
void nilfs_mdt_clear_shadow_map(struct inode *inode);
int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
						struct buffer_head *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 ((struct the_nilfs *)inode->i_sb->s_fs_info)->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 <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
ebdfed4d RK	31	struct nilfs_shadow_map {
	32	struct nilfs_bmap_store bmap_store;
	33	struct address_space frozen_data;
	34	struct address_space frozen_btnodes;
	35	struct list_head frozen_buffers;
	36	};
	37
5eb563f5 RK	38	/**
5eb563f5 RK	39	* struct nilfs_mdt_info - on-memory private data of meta data files
5eb563f5 RK	40	* @mi_sem: reader/writer semaphore for meta data operations
	41	* @mi_bgl: per-blockgroup locking
	42	* @mi_entry_size: size of an entry
	43	* @mi_first_entry_offset: offset to the first entry
	44	* @mi_entries_per_block: number of entries in a block
db38d5ad	45	* @mi_palloc_cache: persistent object allocator cache
ebdfed4d	46	* @mi_shadow: shadow of bmap and page caches
5eb563f5 RK	47	* @mi_blocks_per_group: number of blocks in a group
	48	* @mi_blocks_per_desc_block: number of blocks per descriptor block
	49	*/
	50	struct nilfs_mdt_info {
5eb563f5 RK	51	struct rw_semaphore mi_sem;
	52	struct blockgroup_lock *mi_bgl;
	53	unsigned mi_entry_size;
	54	unsigned mi_first_entry_offset;
	55	unsigned long mi_entries_per_block;
db38d5ad	56	struct nilfs_palloc_cache *mi_palloc_cache;
ebdfed4d	57	struct nilfs_shadow_map *mi_shadow;
5eb563f5 RK	58	unsigned long mi_blocks_per_group;
	59	unsigned long mi_blocks_per_desc_block;
	60	};
	61
	62	static inline struct nilfs_mdt_info NILFS_MDT(const struct inode inode)
	63	{
	64	return inode->i_private;
	65	}
	66
5eb563f5 RK	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
f1e89c86	79	int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
5eb563f5	80	void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
5eb563f5	81
ebdfed4d RK	82	int nilfs_mdt_setup_shadow_map(struct inode *inode,
	83	struct nilfs_shadow_map *shadow);
	84	int nilfs_mdt_save_to_shadow_map(struct inode *inode);
	85	void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
	86	void nilfs_mdt_clear_shadow_map(struct inode *inode);
b1f6a4f2 RK	87	int nilfs_mdt_freeze_buffer(struct inode inode, struct buffer_head bh);
	88	struct buffer_head nilfs_mdt_get_frozen_buffer(struct inode inode,
	89	struct buffer_head *bh);
5eb563f5	90
5eb563f5 RK	91	static inline void nilfs_mdt_mark_dirty(struct inode *inode)
	92	{
	93	if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
	94	set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
	95	}
	96
	97	static inline void nilfs_mdt_clear_dirty(struct inode *inode)
	98	{
	99	clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
	100	}
	101
	102	static inline __u64 nilfs_mdt_cno(struct inode *inode)
	103	{
0ef28f9a	104	return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
5eb563f5 RK	105	}
	106
	107	#define nilfs_mdt_bgl_lock(inode, bg) \
	108	(&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
	109
5eb563f5	110	#endif /* _NILFS_MDT_H */