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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 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net>, | |
21 | * Seiji Kihara <kihara@osrg.net>. | |
22 | */ | |
23 | ||
24 | #ifndef _NILFS_PAGE_H | |
25 | #define _NILFS_PAGE_H | |
26 | ||
27 | #include <linux/buffer_head.h> | |
28 | #include "nilfs.h" | |
29 | ||
30 | /* | |
31 | * Extended buffer state bits | |
32 | */ | |
33 | enum { | |
34 | BH_NILFS_Allocated = BH_PrivateStart, | |
35 | BH_NILFS_Node, | |
36 | BH_NILFS_Volatile, | |
4e13e66b | 37 | BH_NILFS_Checked, |
b1f6a4f2 | 38 | BH_NILFS_Redirected, |
0bd49f94 RK |
39 | }; |
40 | ||
41 | BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */ | |
42 | BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */ | |
43 | BUFFER_FNS(NILFS_Volatile, nilfs_volatile) | |
4e13e66b | 44 | BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */ |
b1f6a4f2 | 45 | BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */ |
0bd49f94 RK |
46 | |
47 | ||
48 | void nilfs_mark_buffer_dirty(struct buffer_head *bh); | |
49 | int __nilfs_clear_page_dirty(struct page *); | |
50 | ||
51 | struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *, | |
52 | unsigned long, unsigned long); | |
53 | void nilfs_forget_buffer(struct buffer_head *); | |
54 | void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *); | |
55 | int nilfs_page_buffers_clean(struct page *); | |
56 | void nilfs_page_bug(struct page *); | |
57 | struct page *nilfs_alloc_private_page(struct block_device *, int, | |
58 | unsigned long); | |
59 | void nilfs_free_private_page(struct page *); | |
60 | ||
61 | int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); | |
62 | void nilfs_copy_back_pages(struct address_space *, struct address_space *); | |
63 | void nilfs_clear_dirty_pages(struct address_space *); | |
ebdfed4d RK |
64 | void nilfs_mapping_init_once(struct address_space *mapping); |
65 | void nilfs_mapping_init(struct address_space *mapping, | |
66 | struct backing_dev_info *bdi, | |
67 | const struct address_space_operations *aops); | |
0bd49f94 RK |
68 | unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); |
69 | ||
70 | #define NILFS_PAGE_BUG(page, m, a...) \ | |
71 | do { nilfs_page_bug(page); BUG(); } while (0) | |
72 | ||
73 | static inline struct buffer_head * | |
74 | nilfs_page_get_nth_block(struct page *page, unsigned int count) | |
75 | { | |
76 | struct buffer_head *bh = page_buffers(page); | |
77 | ||
78 | while (count-- > 0) | |
79 | bh = bh->b_this_page; | |
80 | get_bh(bh); | |
81 | return bh; | |
82 | } | |
83 | ||
84 | #endif /* _NILFS_PAGE_H */ |