/* * 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_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 */