[people/ms/linux.git] / fs / nilfs2 / page.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Buffer/page management specific to NILFS
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * 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);
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
ae98043f	1	/* SPDX-License-Identifier: GPL-2.0+ */
0bd49f94	2	/*
94ee1d91	3	* Buffer/page management specific to NILFS
0bd49f94 RK	4	*
	5	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	6	*
4b420ab4	7	* Written by Ryusuke Konishi and Seiji Kihara.
0bd49f94 RK	8	*/
	9
	10	#ifndef _NILFS_PAGE_H
	11	#define _NILFS_PAGE_H
	12
	13	#include <linux/buffer_head.h>
	14	#include "nilfs.h"
	15
	16	/*
	17	* Extended buffer state bits
	18	*/
	19	enum {
	20	BH_NILFS_Allocated = BH_PrivateStart,
	21	BH_NILFS_Node,
	22	BH_NILFS_Volatile,
4e13e66b	23	BH_NILFS_Checked,
b1f6a4f2	24	BH_NILFS_Redirected,
0bd49f94 RK	25	};
0bd49f94 RK	26
0bd49f94 RK	27	BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
0bd49f94 RK	28	BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
4e13e66b	29	BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
b1f6a4f2	30	BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
0bd49f94 RK	31
0bd49f94 RK	32
0bd49f94 RK	33	int __nilfs_clear_page_dirty(struct page *);
	34
	35	struct buffer_head nilfs_grab_buffer(struct inode , struct address_space *,
	36	unsigned long, unsigned long);
	37	void nilfs_forget_buffer(struct buffer_head *);
	38	void nilfs_copy_buffer(struct buffer_head , struct buffer_head );
	39	int nilfs_page_buffers_clean(struct page *);
	40	void nilfs_page_bug(struct page *);
0bd49f94 RK	41
	42	int nilfs_copy_dirty_pages(struct address_space , struct address_space );
	43	void nilfs_copy_back_pages(struct address_space , struct address_space );
8c26c4e2 VD	44	void nilfs_clear_dirty_page(struct page *, bool);
8c26c4e2 VD	45	void nilfs_clear_dirty_pages(struct address_space *, bool);
0c6c44cb RK	46	unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
0c6c44cb RK	47	unsigned int);
622daaff RK	48	unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
	49	sector_t start_blk,
	50	sector_t *blkoff);
0bd49f94 RK	51
	52	#define NILFS_PAGE_BUG(page, m, a...) \
	53	do { nilfs_page_bug(page); BUG(); } while (0)
	54
	55	static inline struct buffer_head *
	56	nilfs_page_get_nth_block(struct page *page, unsigned int count)
	57	{
	58	struct buffer_head *bh = page_buffers(page);
	59
	60	while (count-- > 0)
	61	bh = bh->b_this_page;
	62	get_bh(bh);
	63	return bh;
	64	}
	65
	66	#endif /* _NILFS_PAGE_H */