1 /* 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 */ 33 enum { 34 BH_NILFS_Allocated = BH_PrivateStart, 35 BH_NILFS_Node, 36 BH_NILFS_Volatile, 37 BH_NILFS_Checked, 38 BH_NILFS_Redirected, 39 }; 40 41 BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */ 42 BUFFER_FNS(NILFS_Volatile, nilfs_volatile) 43 BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */ 44 BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */ 45 46 47 int __nilfs_clear_page_dirty(struct page *); 48 49 struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *, 50 unsigned long, unsigned long); 51 void nilfs_forget_buffer(struct buffer_head *); 52 void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *); 53 int nilfs_page_buffers_clean(struct page *); 54 void nilfs_page_bug(struct page *); 55 56 int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); 57 void nilfs_copy_back_pages(struct address_space *, struct address_space *); 58 void nilfs_clear_dirty_page(struct page *, bool); 59 void nilfs_clear_dirty_pages(struct address_space *, bool); 60 void nilfs_mapping_init(struct address_space *mapping, struct inode *inode); 61 unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); 62 unsigned long nilfs_find_uncommitted_extent(struct inode *inode, 63 sector_t start_blk, 64 sector_t *blkoff); 65 66 #define NILFS_PAGE_BUG(page, m, a...) \ 67 do { nilfs_page_bug(page); BUG(); } while (0) 68 69 static inline struct buffer_head * 70 nilfs_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 */ 81