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 }; 38 39 BUFFER_FNS(NILFS_Allocated, nilfs_allocated) /* nilfs private buffers */ 40 BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */ 41 BUFFER_FNS(NILFS_Volatile, nilfs_volatile) 42 43 44 void nilfs_mark_buffer_dirty(struct buffer_head *bh); 45 int __nilfs_clear_page_dirty(struct page *); 46 47 struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *, 48 unsigned long, unsigned long); 49 void nilfs_forget_buffer(struct buffer_head *); 50 void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *); 51 int nilfs_page_buffers_clean(struct page *); 52 void nilfs_page_bug(struct page *); 53 struct page *nilfs_alloc_private_page(struct block_device *, int, 54 unsigned long); 55 void nilfs_free_private_page(struct page *); 56 57 int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); 58 void nilfs_copy_back_pages(struct address_space *, struct address_space *); 59 void nilfs_clear_dirty_pages(struct address_space *); 60 unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); 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