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24#ifndef _NILFS_PAGE_H
25#define _NILFS_PAGE_H
26
27#include <linux/buffer_head.h>
28#include "nilfs.h"
29
30
31
32
33enum {
34 BH_NILFS_Allocated = BH_PrivateStart,
35 BH_NILFS_Node,
36 BH_NILFS_Volatile,
37 BH_NILFS_Checked,
38 BH_NILFS_Redirected,
39};
40
41BUFFER_FNS(NILFS_Node, nilfs_node)
42BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
43BUFFER_FNS(NILFS_Checked, nilfs_checked)
44BUFFER_FNS(NILFS_Redirected, nilfs_redirected)
45
46
47int __nilfs_clear_page_dirty(struct page *);
48
49struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
50 unsigned long, unsigned long);
51void nilfs_forget_buffer(struct buffer_head *);
52void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
53int nilfs_page_buffers_clean(struct page *);
54void nilfs_page_bug(struct page *);
55
56int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
57void nilfs_copy_back_pages(struct address_space *, struct address_space *);
58void nilfs_clear_dirty_page(struct page *, bool);
59void nilfs_clear_dirty_pages(struct address_space *, bool);
60void nilfs_mapping_init(struct address_space *mapping, struct inode *inode);
61unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
62unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
63 sector_t start_blk,
64 sector_t *blkoff);
65
66#define NILFS_PAGE_BUG(page, m, a...) \
67 do { nilfs_page_bug(page); BUG(); } while (0)
68
69static inline struct buffer_head *
70nilfs_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
81