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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
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070041BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
42BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
Ryusuke Konishi4e13e662010-07-18 10:42:25 +090043BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
Ryusuke Konishib1f6a4f2010-08-31 11:40:34 +090044BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070045
46
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070047int __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 *);
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070055
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_pages(struct address_space *);
Ryusuke Konishiaa405b12011-05-05 12:56:51 +090059void nilfs_mapping_init(struct address_space *mapping, struct inode *inode,
Jens Axboe7eaceac2011-03-10 08:52:07 +010060 struct backing_dev_info *bdi);
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070061unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
Ryusuke Konishi622daaff2010-12-26 16:38:43 +090062unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
63 sector_t start_blk,
64 sector_t *blkoff);
Ryusuke Konishi0bd49f92009-04-06 19:01:27 -070065
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 /* _NILFS_PAGE_H */