page.h

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/*
 * 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 <[email protected]>,
 *            Seiji Kihara <[email protected]>.
 */

#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_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 */


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 *);

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 inode *inode,
            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 */