projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0bd49f94 RK |
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 */ |