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 * Written by Ryusuke Konishi and Seiji Kihara. 17 */ 18 19 #ifndef _NILFS_PAGE_H 20 #define _NILFS_PAGE_H 21 22 #include <linux/buffer_head.h> 23 #include "nilfs.h" 24 25 /* 26 * Extended buffer state bits 27 */ 28 enum { 29 BH_NILFS_Allocated = BH_PrivateStart, 30 BH_NILFS_Node, 31 BH_NILFS_Volatile, 32 BH_NILFS_Checked, 33 BH_NILFS_Redirected, 34 }; 35 36 BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */ 37 BUFFER_FNS(NILFS_Volatile, nilfs_volatile) 38 BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */ 39 BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */ 40 41 42 int __nilfs_clear_page_dirty(struct page *); 43 44 struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *, 45 unsigned long, unsigned long); 46 void nilfs_forget_buffer(struct buffer_head *); 47 void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *); 48 int nilfs_page_buffers_clean(struct page *); 49 void nilfs_page_bug(struct page *); 50 51 int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); 52 void nilfs_copy_back_pages(struct address_space *, struct address_space *); 53 void nilfs_clear_dirty_page(struct page *, bool); 54 void nilfs_clear_dirty_pages(struct address_space *, bool); 55 void nilfs_mapping_init(struct address_space *mapping, struct inode *inode); 56 unsigned int nilfs_page_count_clean_buffers(struct page *, unsigned int, 57 unsigned int); 58 unsigned long nilfs_find_uncommitted_extent(struct inode *inode, 59 sector_t start_blk, 60 sector_t *blkoff); 61 62 #define NILFS_PAGE_BUG(page, m, a...) \ 63 do { nilfs_page_bug(page); BUG(); } while (0) 64 65 static inline struct buffer_head * 66 nilfs_page_get_nth_block(struct page *page, unsigned int count) 67 { 68 struct buffer_head *bh = page_buffers(page); 69 70 while (count-- > 0) 71 bh = bh->b_this_page; 72 get_bh(bh); 73 return bh; 74 } 75 76 #endif /* _NILFS_PAGE_H */ 77