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

 1/* SPDX-License-Identifier: GPL-2.0+ */
 2/*
 3 * Buffer/page management specific to NILFS
 4 *
 5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 6 *
 7 * Written by Ryusuke Konishi and Seiji Kihara.
 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 */
19enum {
20	BH_NILFS_Allocated = BH_PrivateStart,
21	BH_NILFS_Node,
22	BH_NILFS_Volatile,
23	BH_NILFS_Checked,
24	BH_NILFS_Redirected,
25};
26
27BUFFER_FNS(NILFS_Node, nilfs_node)		/* nilfs node buffers */
28BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
29BUFFER_FNS(NILFS_Checked, nilfs_checked)	/* buffer is verified */
30BUFFER_FNS(NILFS_Redirected, nilfs_redirected)	/* redirected to a copy */
31
32
33int __nilfs_clear_page_dirty(struct page *);
34
35struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
36				      unsigned long, unsigned long);
37void nilfs_forget_buffer(struct buffer_head *);
38void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
39int nilfs_page_buffers_clean(struct page *);
40void nilfs_page_bug(struct page *);
41
42int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
43void nilfs_copy_back_pages(struct address_space *, struct address_space *);
44void nilfs_clear_dirty_page(struct page *, bool);
45void nilfs_clear_dirty_pages(struct address_space *, bool);
 
46unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
47					    unsigned int);
48unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
49					    sector_t start_blk,
50					    sector_t *blkoff);
51
52#define NILFS_PAGE_BUG(page, m, a...) \
53	do { nilfs_page_bug(page); BUG(); } while (0)
54
55static inline struct buffer_head *
56nilfs_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 */