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1 | /* |
2 | * mdt.h - NILFS meta data file prototype and definitions |
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 | */ |
22 | |
23 | #ifndef _NILFS_MDT_H |
24 | #define _NILFS_MDT_H |
25 | |
26 | #include <linux/buffer_head.h> |
27 | #include <linux/blockgroup_lock.h> |
28 | #include "nilfs.h" |
29 | #include "page.h" |
30 | |
31 | struct nilfs_shadow_map { |
32 | struct nilfs_bmap_store bmap_store; |
33 | struct address_space frozen_data; |
34 | struct address_space frozen_btnodes; |
35 | struct list_head frozen_buffers; |
36 | }; |
37 | |
38 | /** |
39 | * struct nilfs_mdt_info - on-memory private data of meta data files |
40 | * @mi_sem: reader/writer semaphore for meta data operations |
41 | * @mi_bgl: per-blockgroup locking |
42 | * @mi_entry_size: size of an entry |
43 | * @mi_first_entry_offset: offset to the first entry |
44 | * @mi_entries_per_block: number of entries in a block |
45 | * @mi_palloc_cache: persistent object allocator cache |
46 | * @mi_shadow: shadow of bmap and page caches |
47 | * @mi_blocks_per_group: number of blocks in a group |
48 | * @mi_blocks_per_desc_block: number of blocks per descriptor block |
49 | */ |
50 | struct nilfs_mdt_info { |
51 | struct rw_semaphore mi_sem; |
52 | struct blockgroup_lock *mi_bgl; |
53 | unsigned mi_entry_size; |
54 | unsigned mi_first_entry_offset; |
55 | unsigned long mi_entries_per_block; |
56 | struct nilfs_palloc_cache *mi_palloc_cache; |
57 | struct nilfs_shadow_map *mi_shadow; |
58 | unsigned long mi_blocks_per_group; |
59 | unsigned long mi_blocks_per_desc_block; |
60 | }; |
61 | |
62 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) |
63 | { |
64 | return inode->i_private; |
65 | } |
66 | |
67 | /* Default GFP flags using highmem */ |
68 | #define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM) |
69 | |
70 | int nilfs_mdt_get_block(struct inode *, unsigned long, int, |
71 | void (*init_block)(struct inode *, |
72 | struct buffer_head *, void *), |
73 | struct buffer_head **); |
74 | int nilfs_mdt_delete_block(struct inode *, unsigned long); |
75 | int nilfs_mdt_forget_block(struct inode *, unsigned long); |
76 | int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); |
77 | int nilfs_mdt_fetch_dirty(struct inode *); |
78 | |
79 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz); |
80 | void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); |
81 | |
82 | int nilfs_mdt_setup_shadow_map(struct inode *inode, |
83 | struct nilfs_shadow_map *shadow); |
84 | int nilfs_mdt_save_to_shadow_map(struct inode *inode); |
85 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode); |
86 | void nilfs_mdt_clear_shadow_map(struct inode *inode); |
87 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); |
88 | struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, |
89 | struct buffer_head *bh); |
90 | |
91 | static inline void nilfs_mdt_mark_dirty(struct inode *inode) |
92 | { |
93 | if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) |
94 | set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); |
95 | } |
96 | |
97 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) |
98 | { |
99 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); |
100 | } |
101 | |
102 | static inline __u64 nilfs_mdt_cno(struct inode *inode) |
103 | { |
104 | return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno; |
105 | } |
106 | |
107 | #define nilfs_mdt_bgl_lock(inode, bg) \ |
108 | (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) |
109 | |
110 | #endif /* _NILFS_MDT_H */ |
111 |
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