86 строки
2.8 KiB
C
86 строки
2.8 KiB
C
/*
|
|
* page.h - buffer/page management specific to NILFS
|
|
*
|
|
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Written by Ryusuke Konishi <ryusuke@osrg.net>,
|
|
* Seiji Kihara <kihara@osrg.net>.
|
|
*/
|
|
|
|
#ifndef _NILFS_PAGE_H
|
|
#define _NILFS_PAGE_H
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include "nilfs.h"
|
|
|
|
/*
|
|
* Extended buffer state bits
|
|
*/
|
|
enum {
|
|
BH_NILFS_Allocated = BH_PrivateStart,
|
|
BH_NILFS_Node,
|
|
BH_NILFS_Volatile,
|
|
BH_NILFS_Checked,
|
|
BH_NILFS_Redirected,
|
|
};
|
|
|
|
BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */
|
|
BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
|
|
BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
|
|
BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
|
|
BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
|
|
|
|
|
|
void nilfs_mark_buffer_dirty(struct buffer_head *bh);
|
|
int __nilfs_clear_page_dirty(struct page *);
|
|
|
|
struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
|
|
unsigned long, unsigned long);
|
|
void nilfs_forget_buffer(struct buffer_head *);
|
|
void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
|
|
int nilfs_page_buffers_clean(struct page *);
|
|
void nilfs_page_bug(struct page *);
|
|
struct page *nilfs_alloc_private_page(struct block_device *, int,
|
|
unsigned long);
|
|
void nilfs_free_private_page(struct page *);
|
|
|
|
int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
|
|
void nilfs_copy_back_pages(struct address_space *, struct address_space *);
|
|
void nilfs_clear_dirty_pages(struct address_space *);
|
|
void nilfs_mapping_init(struct address_space *mapping,
|
|
struct backing_dev_info *bdi);
|
|
unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
|
|
unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
|
|
sector_t start_blk,
|
|
sector_t *blkoff);
|
|
|
|
#define NILFS_PAGE_BUG(page, m, a...) \
|
|
do { nilfs_page_bug(page); BUG(); } while (0)
|
|
|
|
static inline struct buffer_head *
|
|
nilfs_page_get_nth_block(struct page *page, unsigned int count)
|
|
{
|
|
struct buffer_head *bh = page_buffers(page);
|
|
|
|
while (count-- > 0)
|
|
bh = bh->b_this_page;
|
|
get_bh(bh);
|
|
return bh;
|
|
}
|
|
|
|
#endif /* _NILFS_PAGE_H */
|