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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 | ||
31 | /** | |
32 | * struct nilfs_mdt_info - on-memory private data of meta data files | |
33 | * @mi_nilfs: back pointer to the_nilfs struct | |
34 | * @mi_sem: reader/writer semaphore for meta data operations | |
35 | * @mi_bgl: per-blockgroup locking | |
36 | * @mi_entry_size: size of an entry | |
37 | * @mi_first_entry_offset: offset to the first entry | |
38 | * @mi_entries_per_block: number of entries in a block | |
db38d5ad | 39 | * @mi_palloc_cache: persistent object allocator cache |
5eb563f5 RK |
40 | * @mi_blocks_per_group: number of blocks in a group |
41 | * @mi_blocks_per_desc_block: number of blocks per descriptor block | |
42 | */ | |
43 | struct nilfs_mdt_info { | |
44 | struct the_nilfs *mi_nilfs; | |
45 | struct rw_semaphore mi_sem; | |
46 | struct blockgroup_lock *mi_bgl; | |
47 | unsigned mi_entry_size; | |
48 | unsigned mi_first_entry_offset; | |
49 | unsigned long mi_entries_per_block; | |
db38d5ad | 50 | struct nilfs_palloc_cache *mi_palloc_cache; |
5eb563f5 RK |
51 | unsigned long mi_blocks_per_group; |
52 | unsigned long mi_blocks_per_desc_block; | |
53 | }; | |
54 | ||
55 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) | |
56 | { | |
57 | return inode->i_private; | |
58 | } | |
59 | ||
60 | static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode) | |
61 | { | |
62 | struct super_block *sb = inode->i_sb; | |
63 | ||
64 | return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs; | |
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 | ||
5e19a995 RK |
79 | int nilfs_mdt_init(struct inode *inode, struct the_nilfs *nilfs, |
80 | gfp_t gfp_mask, size_t objsz); | |
5731e191 RK |
81 | struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t, |
82 | size_t); | |
5eb563f5 | 83 | struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *, |
5e19a995 | 84 | ino_t); |
5eb563f5 | 85 | void nilfs_mdt_destroy(struct inode *); |
5eb563f5 RK |
86 | void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); |
87 | void nilfs_mdt_set_shadow(struct inode *, struct inode *); | |
88 | ||
89 | ||
90 | #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh) | |
91 | ||
92 | static inline void nilfs_mdt_mark_dirty(struct inode *inode) | |
93 | { | |
94 | if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) | |
95 | set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
96 | } | |
97 | ||
98 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) | |
99 | { | |
100 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
101 | } | |
102 | ||
103 | static inline __u64 nilfs_mdt_cno(struct inode *inode) | |
104 | { | |
105 | return NILFS_MDT(inode)->mi_nilfs->ns_cno; | |
106 | } | |
107 | ||
108 | #define nilfs_mdt_bgl_lock(inode, bg) \ | |
109 | (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) | |
110 | ||
5eb563f5 | 111 | #endif /* _NILFS_MDT_H */ |