[deliverable/linux.git] / fs / nilfs2 / page.h

/*
 * page.h - buffer/page management specific to NILFS
 *
 * 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.
 *
 * Written by Ryusuke Konishi and Seiji Kihara.
 */

#ifndef _NILFS_PAGE_H
#define _NILFS_PAGE_H

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

/*
 * Extended buffer state bits
 */
enum {
	BH_NILFS_Allocated = BH_PrivateStart,
	BH_NILFS_Node,
	BH_NILFS_Volatile,
	BH_NILFS_Checked,
	BH_NILFS_Redirected,
};

BUFFER_FNS(NILFS_Node, nilfs_node)		/* nilfs node buffers */
BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
BUFFER_FNS(NILFS_Checked, nilfs_checked)	/* buffer is verified */
BUFFER_FNS(NILFS_Redirected, nilfs_redirected)	/* redirected to a copy */


int __nilfs_clear_page_dirty(struct page *);

struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
				      unsigned long, unsigned long);
void nilfs_forget_buffer(struct buffer_head *);
void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
int nilfs_page_buffers_clean(struct page *);
void nilfs_page_bug(struct page *);

int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
void nilfs_copy_back_pages(struct address_space *, struct address_space *);
void nilfs_clear_dirty_page(struct page *, bool);
void nilfs_clear_dirty_pages(struct address_space *, bool);
void nilfs_mapping_init(struct address_space *mapping, struct inode *inode);
unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
					    unsigned int);
unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
					    sector_t start_blk,
					    sector_t *blkoff);

#define NILFS_PAGE_BUG(page, m, a...) \
	do { nilfs_page_bug(page); BUG(); } while (0)

static inline struct buffer_head *
nilfs_page_get_nth_block(struct page *page, unsigned int count)
{
	struct buffer_head *bh = page_buffers(page);

	while (count-- > 0)
		bh = bh->b_this_page;
	get_bh(bh);
	return bh;
}

#endif /* _NILFS_PAGE_H */
Commit	Line	Data
0bd49f94 RK	1	/*
	2	* page.h - buffer/page management specific to NILFS
	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	*
4b420ab4	16	* Written by Ryusuke Konishi and Seiji Kihara.
0bd49f94 RK	17	*/
	18
	19	#ifndef _NILFS_PAGE_H
	20	#define _NILFS_PAGE_H
	21
	22	#include <linux/buffer_head.h>
	23	#include "nilfs.h"
	24
	25	/*
	26	* Extended buffer state bits
	27	*/
	28	enum {
	29	BH_NILFS_Allocated = BH_PrivateStart,
	30	BH_NILFS_Node,
	31	BH_NILFS_Volatile,
4e13e66b	32	BH_NILFS_Checked,
b1f6a4f2	33	BH_NILFS_Redirected,
0bd49f94 RK	34	};
0bd49f94 RK	35
0bd49f94 RK	36	BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
0bd49f94 RK	37	BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
4e13e66b	38	BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
b1f6a4f2	39	BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
0bd49f94 RK	40
0bd49f94 RK	41
0bd49f94 RK	42	int __nilfs_clear_page_dirty(struct page *);
	43
	44	struct buffer_head nilfs_grab_buffer(struct inode , struct address_space *,
	45	unsigned long, unsigned long);
	46	void nilfs_forget_buffer(struct buffer_head *);
	47	void nilfs_copy_buffer(struct buffer_head , struct buffer_head );
	48	int nilfs_page_buffers_clean(struct page *);
	49	void nilfs_page_bug(struct page *);
0bd49f94 RK	50
	51	int nilfs_copy_dirty_pages(struct address_space , struct address_space );
	52	void nilfs_copy_back_pages(struct address_space , struct address_space );
8c26c4e2 VD	53	void nilfs_clear_dirty_page(struct page *, bool);
8c26c4e2 VD	54	void nilfs_clear_dirty_pages(struct address_space *, bool);
b83ae6d4	55	void nilfs_mapping_init(struct address_space mapping, struct inode inode);
0c6c44cb RK	56	unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
0c6c44cb RK	57	unsigned int);
622daaff RK	58	unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
	59	sector_t start_blk,
	60	sector_t *blkoff);
0bd49f94 RK	61
	62	#define NILFS_PAGE_BUG(page, m, a...) \
	63	do { nilfs_page_bug(page); BUG(); } while (0)
	64
	65	static inline struct buffer_head *
	66	nilfs_page_get_nth_block(struct page *page, unsigned int count)
	67	{
	68	struct buffer_head *bh = page_buffers(page);
	69
	70	while (count-- > 0)
	71	bh = bh->b_this_page;
	72	get_bh(bh);
	73	return bh;
	74	}
	75
	76	#endif /* _NILFS_PAGE_H */