2 * mdt.h - NILFS meta data file prototype and definitions
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
26 #include <linux/buffer_head.h>
27 #include <linux/blockgroup_lock.h>
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_palloc_cache: persistent object allocator cache
40 * @mi_blocks_per_group: number of blocks in a group
41 * @mi_blocks_per_desc_block: number of blocks per descriptor block
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
;
50 struct nilfs_palloc_cache
*mi_palloc_cache
;
51 unsigned long mi_blocks_per_group
;
52 unsigned long mi_blocks_per_desc_block
;
55 static inline struct nilfs_mdt_info
*NILFS_MDT(const struct inode
*inode
)
57 return inode
->i_private
;
60 static inline struct the_nilfs
*NILFS_I_NILFS(struct inode
*inode
)
62 struct super_block
*sb
= inode
->i_sb
;
64 return sb
? NILFS_SB(sb
)->s_nilfs
: NILFS_MDT(inode
)->mi_nilfs
;
67 /* Default GFP flags using highmem */
68 #define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)
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
*);
79 struct inode
*nilfs_mdt_new(struct the_nilfs
*, struct super_block
*, ino_t
,
81 struct inode
*nilfs_mdt_new_common(struct the_nilfs
*, struct super_block
*,
82 ino_t
, gfp_t
, size_t);
83 void nilfs_mdt_destroy(struct inode
*);
84 void nilfs_mdt_set_entry_size(struct inode
*, unsigned, unsigned);
85 void nilfs_mdt_set_shadow(struct inode
*, struct inode
*);
88 #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
90 static inline void nilfs_mdt_mark_dirty(struct inode
*inode
)
92 if (!test_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
))
93 set_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
);
96 static inline void nilfs_mdt_clear_dirty(struct inode
*inode
)
98 clear_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
);
101 static inline __u64
nilfs_mdt_cno(struct inode
*inode
)
103 return NILFS_MDT(inode
)->mi_nilfs
->ns_cno
;
106 #define nilfs_mdt_bgl_lock(inode, bg) \
107 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
109 #endif /* _NILFS_MDT_H */
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