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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 | * | |
4b420ab4 | 16 | * Written by Ryusuke Konishi and Seiji Kihara. |
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17 | */ |
18 | ||
19 | #ifndef _NILFS_PAGE_H | |
20 | #define _NILFS_PAGE_H | |
21 | ||
22 | #include <linux/buffer_head.h> | |
23 | #include "nilfs.h" | |
24 | ||
25 | /* | |
26 | * Extended buffer state bits | |
27 | */ | |
28 | enum { | |
29 | BH_NILFS_Allocated = BH_PrivateStart, | |
30 | BH_NILFS_Node, | |
31 | BH_NILFS_Volatile, | |
4e13e66b | 32 | BH_NILFS_Checked, |
b1f6a4f2 | 33 | BH_NILFS_Redirected, |
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34 | }; |
35 | ||
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36 | BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */ |
37 | BUFFER_FNS(NILFS_Volatile, nilfs_volatile) | |
4e13e66b | 38 | BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */ |
b1f6a4f2 | 39 | BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */ |
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40 | |
41 | ||
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42 | int __nilfs_clear_page_dirty(struct page *); |
43 | ||
44 | struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *, | |
45 | unsigned long, unsigned long); | |
46 | void nilfs_forget_buffer(struct buffer_head *); | |
47 | void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *); | |
48 | int nilfs_page_buffers_clean(struct page *); | |
49 | void nilfs_page_bug(struct page *); | |
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50 | |
51 | int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); | |
52 | void nilfs_copy_back_pages(struct address_space *, struct address_space *); | |
8c26c4e2 VD |
53 | void nilfs_clear_dirty_page(struct page *, bool); |
54 | void nilfs_clear_dirty_pages(struct address_space *, bool); | |
b83ae6d4 | 55 | void nilfs_mapping_init(struct address_space *mapping, struct inode *inode); |
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56 | unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int, |
57 | unsigned int); | |
622daaff RK |
58 | unsigned long nilfs_find_uncommitted_extent(struct inode *inode, |
59 | sector_t start_blk, | |
60 | sector_t *blkoff); | |
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61 | |
62 | #define NILFS_PAGE_BUG(page, m, a...) \ | |
63 | do { nilfs_page_bug(page); BUG(); } while (0) | |
64 | ||
65 | static inline struct buffer_head * | |
66 | nilfs_page_get_nth_block(struct page *page, unsigned int count) | |
67 | { | |
68 | struct buffer_head *bh = page_buffers(page); | |
69 | ||
70 | while (count-- > 0) | |
71 | bh = bh->b_this_page; | |
72 | get_bh(bh); | |
73 | return bh; | |
74 | } | |
75 | ||
76 | #endif /* _NILFS_PAGE_H */ |