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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 | ||
f5974c8f VD |
31 | /** |
32 | * struct nilfs_shadow_map - shadow mapping of meta data file | |
33 | * @bmap_store: shadow copy of bmap state | |
34 | * @frozen_data: shadowed dirty data pages | |
35 | * @frozen_btnodes: shadowed dirty b-tree nodes' pages | |
36 | * @frozen_buffers: list of frozen buffers | |
37 | */ | |
ebdfed4d RK |
38 | struct nilfs_shadow_map { |
39 | struct nilfs_bmap_store bmap_store; | |
40 | struct address_space frozen_data; | |
41 | struct address_space frozen_btnodes; | |
42 | struct list_head frozen_buffers; | |
43 | }; | |
44 | ||
5eb563f5 RK |
45 | /** |
46 | * struct nilfs_mdt_info - on-memory private data of meta data files | |
5eb563f5 RK |
47 | * @mi_sem: reader/writer semaphore for meta data operations |
48 | * @mi_bgl: per-blockgroup locking | |
49 | * @mi_entry_size: size of an entry | |
50 | * @mi_first_entry_offset: offset to the first entry | |
51 | * @mi_entries_per_block: number of entries in a block | |
db38d5ad | 52 | * @mi_palloc_cache: persistent object allocator cache |
ebdfed4d | 53 | * @mi_shadow: shadow of bmap and page caches |
5eb563f5 RK |
54 | * @mi_blocks_per_group: number of blocks in a group |
55 | * @mi_blocks_per_desc_block: number of blocks per descriptor block | |
56 | */ | |
57 | struct nilfs_mdt_info { | |
5eb563f5 RK |
58 | struct rw_semaphore mi_sem; |
59 | struct blockgroup_lock *mi_bgl; | |
60 | unsigned mi_entry_size; | |
61 | unsigned mi_first_entry_offset; | |
62 | unsigned long mi_entries_per_block; | |
db38d5ad | 63 | struct nilfs_palloc_cache *mi_palloc_cache; |
ebdfed4d | 64 | struct nilfs_shadow_map *mi_shadow; |
5eb563f5 RK |
65 | unsigned long mi_blocks_per_group; |
66 | unsigned long mi_blocks_per_desc_block; | |
67 | }; | |
68 | ||
69 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) | |
70 | { | |
71 | return inode->i_private; | |
72 | } | |
73 | ||
5eb563f5 | 74 | /* Default GFP flags using highmem */ |
71baba4b | 75 | #define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM) |
5eb563f5 RK |
76 | |
77 | int nilfs_mdt_get_block(struct inode *, unsigned long, int, | |
78 | void (*init_block)(struct inode *, | |
79 | struct buffer_head *, void *), | |
80 | struct buffer_head **); | |
fa33915c RK |
81 | int nilfs_mdt_find_block(struct inode *inode, unsigned long start, |
82 | unsigned long end, unsigned long *blkoff, | |
83 | struct buffer_head **out_bh); | |
5eb563f5 RK |
84 | int nilfs_mdt_delete_block(struct inode *, unsigned long); |
85 | int nilfs_mdt_forget_block(struct inode *, unsigned long); | |
86 | int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); | |
87 | int nilfs_mdt_fetch_dirty(struct inode *); | |
88 | ||
f1e89c86 | 89 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz); |
5eb563f5 | 90 | void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); |
5eb563f5 | 91 | |
ebdfed4d RK |
92 | int nilfs_mdt_setup_shadow_map(struct inode *inode, |
93 | struct nilfs_shadow_map *shadow); | |
94 | int nilfs_mdt_save_to_shadow_map(struct inode *inode); | |
95 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode); | |
96 | void nilfs_mdt_clear_shadow_map(struct inode *inode); | |
b1f6a4f2 RK |
97 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); |
98 | struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, | |
99 | struct buffer_head *bh); | |
5eb563f5 | 100 | |
5eb563f5 RK |
101 | static inline void nilfs_mdt_mark_dirty(struct inode *inode) |
102 | { | |
103 | if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) | |
104 | set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
105 | } | |
106 | ||
107 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) | |
108 | { | |
109 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
110 | } | |
111 | ||
112 | static inline __u64 nilfs_mdt_cno(struct inode *inode) | |
113 | { | |
0ef28f9a | 114 | return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno; |
5eb563f5 RK |
115 | } |
116 | ||
0de6d6b9 RK |
117 | static inline spinlock_t * |
118 | nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group) | |
119 | { | |
120 | return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group); | |
121 | } | |
5eb563f5 | 122 | |
5eb563f5 | 123 | #endif /* _NILFS_MDT_H */ |