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Ryusuke Konishi0bd49f92009-04-06 19:01:27 -07001/*
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 */
33enum {
34 BH_NILFS_Allocated = BH_PrivateStart,
35 BH_NILFS_Node,
36 BH_NILFS_Volatile,
Ryusuke Konishi4e13e662010-07-18 10:42:25 +090037 BH_NILFS_Checked,
Ryusuke Konishib1f6a4f2010-08-31 11:40:34 +090038 BH_NILFS_Redirected,
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070039};
40
41BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */
42BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
43BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
Ryusuke Konishi4e13e662010-07-18 10:42:25 +090044BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
Ryusuke Konishib1f6a4f2010-08-31 11:40:34 +090045BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070046
47
48void nilfs_mark_buffer_dirty(struct buffer_head *bh);
49int __nilfs_clear_page_dirty(struct page *);
50
51struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
52 unsigned long, unsigned long);
53void nilfs_forget_buffer(struct buffer_head *);
54void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
55int nilfs_page_buffers_clean(struct page *);
56void nilfs_page_bug(struct page *);
57struct page *nilfs_alloc_private_page(struct block_device *, int,
58 unsigned long);
59void nilfs_free_private_page(struct page *);
60
61int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
62void nilfs_copy_back_pages(struct address_space *, struct address_space *);
63void nilfs_clear_dirty_pages(struct address_space *);
Ryusuke Konishiebdfed42010-09-06 12:05:43 +090064void nilfs_mapping_init_once(struct address_space *mapping);
65void nilfs_mapping_init(struct address_space *mapping,
66 struct backing_dev_info *bdi,
67 const struct address_space_operations *aops);
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070068unsigned 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
73static inline struct buffer_head *
74nilfs_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 */