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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 | /** |
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 |
39 | * @mi_blocks_per_group: number of blocks in a group |
40 | * @mi_blocks_per_desc_block: number of blocks per descriptor block |
41 | */ |
42 | struct nilfs_mdt_info { |
43 | struct the_nilfs *mi_nilfs; |
44 | struct rw_semaphore mi_sem; |
45 | struct blockgroup_lock *mi_bgl; |
46 | unsigned mi_entry_size; |
47 | unsigned mi_first_entry_offset; |
48 | unsigned long mi_entries_per_block; |
49 | unsigned long mi_blocks_per_group; |
50 | unsigned long mi_blocks_per_desc_block; |
51 | }; |
52 | |
53 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) |
54 | { |
55 | return inode->i_private; |
56 | } |
57 | |
58 | static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode) |
59 | { |
60 | struct super_block *sb = inode->i_sb; |
61 | |
62 | return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs; |
63 | } |
64 | |
65 | /* Default GFP flags using highmem */ |
66 | #define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM) |
67 | |
68 | int nilfs_mdt_get_block(struct inode *, unsigned long, int, |
69 | void (*init_block)(struct inode *, |
70 | struct buffer_head *, void *), |
71 | struct buffer_head **); |
72 | int nilfs_mdt_delete_block(struct inode *, unsigned long); |
73 | int nilfs_mdt_forget_block(struct inode *, unsigned long); |
74 | int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long); |
75 | int nilfs_mdt_fetch_dirty(struct inode *); |
76 | |
77 | struct inode *nilfs_mdt_new(struct the_nilfs *, struct super_block *, ino_t, |
78 | gfp_t); |
79 | struct inode *nilfs_mdt_new_common(struct the_nilfs *, struct super_block *, |
80 | ino_t, gfp_t); |
81 | void nilfs_mdt_destroy(struct inode *); |
82 | void nilfs_mdt_clear(struct inode *); |
83 | void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned); |
84 | void nilfs_mdt_set_shadow(struct inode *, struct inode *); |
85 | |
86 | |
87 | #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh) |
88 | |
89 | static inline void nilfs_mdt_mark_dirty(struct inode *inode) |
90 | { |
91 | if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state)) |
92 | set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); |
93 | } |
94 | |
95 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) |
96 | { |
97 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); |
98 | } |
99 | |
100 | static inline __u64 nilfs_mdt_cno(struct inode *inode) |
101 | { |
102 | return NILFS_MDT(inode)->mi_nilfs->ns_cno; |
103 | } |
104 | |
105 | #define nilfs_mdt_bgl_lock(inode, bg) \ |
106 | (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock) |
107 | |
108 | |
109 | static inline int |
110 | nilfs_mdt_read_inode_direct(struct inode *inode, struct buffer_head *bh, |
111 | unsigned n) |
112 | { |
113 | return nilfs_read_inode_common( |
114 | inode, (struct nilfs_inode *)(bh->b_data + n)); |
115 | } |
116 | |
117 | static inline void |
118 | nilfs_mdt_write_inode_direct(struct inode *inode, struct buffer_head *bh, |
119 | unsigned n) |
120 | { |
121 | nilfs_write_inode_common( |
122 | inode, (struct nilfs_inode *)(bh->b_data + n), 1); |
123 | } |
124 | |
125 | #endif /* _NILFS_MDT_H */ |
126 |
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