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5eb563f5 RK |
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 | ||
ebdfed4d RK |
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 | ||
5eb563f5 RK |
38 | /** |
39 | * struct nilfs_mdt_info - on-memory private data of meta data files | |
40 | * @mi_nilfs: back pointer to the_nilfs struct | |
41 | * @mi_sem: reader/writer semaphore for meta data operations | |
42 | * @mi_bgl: per-blockgroup locking | |
43 | * @mi_entry_size: size of an entry | |
44 | * @mi_first_entry_offset: offset to the first entry | |
45 | * @mi_entries_per_block: number of entries in a block | |
db38d5ad | 46 | * @mi_palloc_cache: persistent object allocator cache |
ebdfed4d | 47 | * @mi_shadow: shadow of bmap and page caches |
5eb563f5 RK |
48 | * @mi_blocks_per_group: number of blocks in a group |
49 | * @mi_blocks_per_desc_block: number of blocks per descriptor block | |
50 | */ | |
51 | struct nilfs_mdt_info { | |
52 | struct the_nilfs *mi_nilfs; | |
53 | struct rw_semaphore mi_sem; | |
54 | struct blockgroup_lock *mi_bgl; | |
55 | unsigned mi_entry_size; | |
56 | unsigned mi_first_entry_offset; | |
57 | unsigned long mi_entries_per_block; | |
db38d5ad | 58 | struct nilfs_palloc_cache *mi_palloc_cache; |
ebdfed4d | 59 | struct nilfs_shadow_map *mi_shadow; |
5eb563f5 RK |
60 | unsigned long mi_blocks_per_group; |
61 | unsigned long mi_blocks_per_desc_block; | |
62 | }; | |
63 | ||
64 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) | |
65 | { | |
66 | return inode->i_private; | |
67 | } | |
68 | ||
69 | static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode) | |
70 | { | |
71 | struct super_block *sb = inode->i_sb; | |
72 | ||
73 | return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs; | |
74 | } | |
75 | ||
76 | /* Default GFP flags using highmem */ | |
77 | #define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM) | |
78 | ||
79 | int nilfs_mdt_get_block(struct inode *, unsigned long, int, | |
80 | void (*init_block)(struct inode *, | |
81 | struct buffer_head *, void *), | |
82 | struct buffer_head **); | |
83 | int nilfs_mdt_delete_block(struct inode *, unsigned long); | |
84 | int nilfs_mdt_forget_block(struct inode *, unsigned long); | |
85 | int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); | |
86 | int nilfs_mdt_fetch_dirty(struct inode *); | |
87 | ||
5e19a995 RK |
88 | int nilfs_mdt_init(struct inode *inode, struct the_nilfs *nilfs, |
89 | gfp_t gfp_mask, size_t objsz); | |
5731e191 RK |
90 | struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t, |
91 | size_t); | |
5eb563f5 | 92 | struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *, |
5e19a995 | 93 | ino_t); |
5eb563f5 | 94 | void nilfs_mdt_destroy(struct inode *); |
5eb563f5 | 95 | void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); |
5eb563f5 | 96 | |
ebdfed4d RK |
97 | int nilfs_mdt_setup_shadow_map(struct inode *inode, |
98 | struct nilfs_shadow_map *shadow); | |
99 | int nilfs_mdt_save_to_shadow_map(struct inode *inode); | |
100 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode); | |
101 | void nilfs_mdt_clear_shadow_map(struct inode *inode); | |
b1f6a4f2 RK |
102 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); |
103 | struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, | |
104 | struct buffer_head *bh); | |
5eb563f5 RK |
105 | |
106 | #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh) | |
107 | ||
108 | static inline void nilfs_mdt_mark_dirty(struct inode *inode) | |
109 | { | |
110 | if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) | |
111 | set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
112 | } | |
113 | ||
114 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) | |
115 | { | |
116 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
117 | } | |
118 | ||
119 | static inline __u64 nilfs_mdt_cno(struct inode *inode) | |
120 | { | |
121 | return NILFS_MDT(inode)->mi_nilfs->ns_cno; | |
122 | } | |
123 | ||
124 | #define nilfs_mdt_bgl_lock(inode, bg) \ | |
125 | (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) | |
126 | ||
5eb563f5 | 127 | #endif /* _NILFS_MDT_H */ |