[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.
 *
 * 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>,
 *            Seiji Kihara <kihara@osrg.net>.
 */

#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 nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
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	*
	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	* Seiji Kihara <kihara@osrg.net>.
	22	*/
	23
	24	#ifndef _NILFS_PAGE_H
	25	#define _NILFS_PAGE_H
	26
	27	#include <linux/buffer_head.h>
	28	#include "nilfs.h"
	29
	30	/*
	31	* Extended buffer state bits
	32	*/
	33	enum {
	34	BH_NILFS_Allocated = BH_PrivateStart,
	35	BH_NILFS_Node,
	36	BH_NILFS_Volatile,
4e13e66b	37	BH_NILFS_Checked,
b1f6a4f2	38	BH_NILFS_Redirected,
0bd49f94 RK	39	};
0bd49f94 RK	40
0bd49f94 RK	41	BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
0bd49f94 RK	42	BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
4e13e66b	43	BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
b1f6a4f2	44	BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
0bd49f94 RK	45
0bd49f94 RK	46
0bd49f94 RK	47	int __nilfs_clear_page_dirty(struct page *);
	48
	49	struct buffer_head nilfs_grab_buffer(struct inode , struct address_space *,
	50	unsigned long, unsigned long);
	51	void nilfs_forget_buffer(struct buffer_head *);
	52	void nilfs_copy_buffer(struct buffer_head , struct buffer_head );
	53	int nilfs_page_buffers_clean(struct page *);
	54	void nilfs_page_bug(struct page *);
0bd49f94 RK	55
	56	int nilfs_copy_dirty_pages(struct address_space , struct address_space );
	57	void nilfs_copy_back_pages(struct address_space , struct address_space );
8c26c4e2 VD	58	void nilfs_clear_dirty_page(struct page *, bool);
8c26c4e2 VD	59	void nilfs_clear_dirty_pages(struct address_space *, bool);
b83ae6d4	60	void nilfs_mapping_init(struct address_space mapping, struct inode inode);
0bd49f94	61	unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
622daaff RK	62	unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
	63	sector_t start_blk,
	64	sector_t *blkoff);
0bd49f94 RK	65
	66	#define NILFS_PAGE_BUG(page, m, a...) \
	67	do { nilfs_page_bug(page); BUG(); } while (0)
	68
	69	static inline struct buffer_head *
	70	nilfs_page_get_nth_block(struct page *page, unsigned int count)
	71	{
	72	struct buffer_head *bh = page_buffers(page);
	73
	74	while (count-- > 0)
	75	bh = bh->b_this_page;
	76	get_bh(bh);
	77	return bh;
	78	}
	79
	80	#endif /* _NILFS_PAGE_H */