LXR linux/fs/nilfs2/page.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * page.h - buffer/page management specific to NILFS
   4 *
   5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   6 *
   7 * Written by Ryusuke Konishi and Seiji Kihara.
   8 */
   9
  10#ifndef _NILFS_PAGE_H
  11#define _NILFS_PAGE_H
  12
  13#include <linux/buffer_head.h>
  14#include "nilfs.h"
  15
  16/*
  17 * Extended buffer state bits
  18 */
  19enum {
  20        BH_NILFS_Allocated = BH_PrivateStart,
  21        BH_NILFS_Node,
  22        BH_NILFS_Volatile,
  23        BH_NILFS_Checked,
  24        BH_NILFS_Redirected,
  25};
  26
  27BUFFER_FNS(NILFS_Node, nilfs_node)              /* nilfs node buffers */
  28BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
  29BUFFER_FNS(NILFS_Checked, nilfs_checked)        /* buffer is verified */
  30BUFFER_FNS(NILFS_Redirected, nilfs_redirected)  /* redirected to a copy */
  31
  32
  33int __nilfs_clear_page_dirty(struct page *);
  34
  35struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
  36                                      unsigned long, unsigned long);
  37void nilfs_forget_buffer(struct buffer_head *);
  38void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
  39int nilfs_page_buffers_clean(struct page *);
  40void nilfs_page_bug(struct page *);
  41
  42int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
  43void nilfs_copy_back_pages(struct address_space *, struct address_space *);
  44void nilfs_clear_dirty_page(struct page *, bool);
  45void nilfs_clear_dirty_pages(struct address_space *, bool);
  46void nilfs_mapping_init(struct address_space *mapping, struct inode *inode);
  47unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int,
  48                                            unsigned int);
  49unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
  50                                            sector_t start_blk,
  51                                            sector_t *blkoff);
  52
  53#define NILFS_PAGE_BUG(page, m, a...) \
  54        do { nilfs_page_bug(page); BUG(); } while (0)
  55
  56static inline struct buffer_head *
  57nilfs_page_get_nth_block(struct page *page, unsigned int count)
  58{
  59        struct buffer_head *bh = page_buffers(page);
  60
  61        while (count-- > 0)
  62                bh = bh->b_this_page;
  63        get_bh(bh);
  64        return bh;
  65}
  66
  67#endif /* _NILFS_PAGE_H */
  68