1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * page.h - buffer/page management specific to NILFS
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Written by Ryusuke Konishi and Seiji Kihara.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #ifndef _NILFS_PAGE_H
11*4882a593Smuzhiyun #define _NILFS_PAGE_H
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/buffer_head.h>
14*4882a593Smuzhiyun #include "nilfs.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /*
17*4882a593Smuzhiyun * Extended buffer state bits
18*4882a593Smuzhiyun */
19*4882a593Smuzhiyun enum {
20*4882a593Smuzhiyun BH_NILFS_Allocated = BH_PrivateStart,
21*4882a593Smuzhiyun BH_NILFS_Node,
22*4882a593Smuzhiyun BH_NILFS_Volatile,
23*4882a593Smuzhiyun BH_NILFS_Checked,
24*4882a593Smuzhiyun BH_NILFS_Redirected,
25*4882a593Smuzhiyun };
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
28*4882a593Smuzhiyun BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
29*4882a593Smuzhiyun BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
30*4882a593Smuzhiyun BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun int __nilfs_clear_page_dirty(struct page *);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
36*4882a593Smuzhiyun unsigned long, unsigned long);
37*4882a593Smuzhiyun void nilfs_forget_buffer(struct buffer_head *);
38*4882a593Smuzhiyun void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
39*4882a593Smuzhiyun int nilfs_page_buffers_clean(struct page *);
40*4882a593Smuzhiyun void nilfs_page_bug(struct page *);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
43*4882a593Smuzhiyun void nilfs_copy_back_pages(struct address_space *, struct address_space *);
44*4882a593Smuzhiyun void nilfs_clear_dirty_page(struct page *, bool);
45*4882a593Smuzhiyun void nilfs_clear_dirty_pages(struct address_space *, bool);
46*4882a593Smuzhiyun void nilfs_mapping_init(struct address_space *mapping, struct inode *inode);
47*4882a593Smuzhiyun unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
48*4882a593Smuzhiyun unsigned int);
49*4882a593Smuzhiyun unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
50*4882a593Smuzhiyun sector_t start_blk,
51*4882a593Smuzhiyun sector_t *blkoff);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun #define NILFS_PAGE_BUG(page, m, a...) \
54*4882a593Smuzhiyun do { nilfs_page_bug(page); BUG(); } while (0)
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static inline struct buffer_head *
nilfs_page_get_nth_block(struct page * page,unsigned int count)57*4882a593Smuzhiyun nilfs_page_get_nth_block(struct page *page, unsigned int count)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun struct buffer_head *bh = page_buffers(page);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun while (count-- > 0)
62*4882a593Smuzhiyun bh = bh->b_this_page;
63*4882a593Smuzhiyun get_bh(bh);
64*4882a593Smuzhiyun return bh;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun #endif /* _NILFS_PAGE_H */
68