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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