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>
31 struct nilfs_shadow_map
{
32 struct nilfs_bmap_store bmap_store
;
33 struct address_space frozen_data
;
34 struct address_space frozen_btnodes
;
35 struct list_head frozen_buffers
;
39 * struct nilfs_mdt_info - on-memory private data of meta data files
40 * @mi_nilfs: back pointer to the_nilfs struct
41 * @mi_sem: reader/writer semaphore for meta data operations
42 * @mi_bgl: per-blockgroup locking
43 * @mi_entry_size: size of an entry
44 * @mi_first_entry_offset: offset to the first entry
45 * @mi_entries_per_block: number of entries in a block
46 * @mi_palloc_cache: persistent object allocator cache
47 * @mi_shadow: shadow of bmap and page caches
48 * @mi_blocks_per_group: number of blocks in a group
49 * @mi_blocks_per_desc_block: number of blocks per descriptor block
51 struct nilfs_mdt_info
{
52 struct the_nilfs
*mi_nilfs
;
53 struct rw_semaphore mi_sem
;
54 struct blockgroup_lock
*mi_bgl
;
55 unsigned mi_entry_size
;
56 unsigned mi_first_entry_offset
;
57 unsigned long mi_entries_per_block
;
58 struct nilfs_palloc_cache
*mi_palloc_cache
;
59 struct nilfs_shadow_map
*mi_shadow
;
60 unsigned long mi_blocks_per_group
;
61 unsigned long mi_blocks_per_desc_block
;
64 static inline struct nilfs_mdt_info
*NILFS_MDT(const struct inode
*inode
)
66 return inode
->i_private
;
69 static inline struct the_nilfs
*NILFS_I_NILFS(struct inode
*inode
)
71 struct super_block
*sb
= inode
->i_sb
;
73 return sb
? NILFS_SB(sb
)->s_nilfs
: NILFS_MDT(inode
)->mi_nilfs
;
76 /* Default GFP flags using highmem */
77 #define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)
79 int nilfs_mdt_get_block(struct inode
*, unsigned long, int,
80 void (*init_block
)(struct inode
*,
81 struct buffer_head
*, void *),
82 struct buffer_head
**);
83 int nilfs_mdt_delete_block(struct inode
*, unsigned long);
84 int nilfs_mdt_forget_block(struct inode
*, unsigned long);
85 int nilfs_mdt_mark_block_dirty(struct inode
*, unsigned long);
86 int nilfs_mdt_fetch_dirty(struct inode
*);
88 int nilfs_mdt_init(struct inode
*inode
, struct the_nilfs
*nilfs
,
89 gfp_t gfp_mask
, size_t objsz
);
90 struct inode
*nilfs_mdt_new(struct the_nilfs
*, struct super_block
*, ino_t
,
92 struct inode
*nilfs_mdt_new_common(struct the_nilfs
*, struct super_block
*,
94 void nilfs_mdt_destroy(struct inode
*);
95 void nilfs_mdt_set_entry_size(struct inode
*, unsigned, unsigned);
96 void nilfs_mdt_set_shadow(struct inode
*, struct inode
*);
98 int nilfs_mdt_setup_shadow_map(struct inode
*inode
,
99 struct nilfs_shadow_map
*shadow
);
100 int nilfs_mdt_save_to_shadow_map(struct inode
*inode
);
101 void nilfs_mdt_restore_from_shadow_map(struct inode
*inode
);
102 void nilfs_mdt_clear_shadow_map(struct inode
*inode
);
104 #define nilfs_mdt_mark_buffer_dirty(bh) nilfs_mark_buffer_dirty(bh)
106 static inline void nilfs_mdt_mark_dirty(struct inode
*inode
)
108 if (!test_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
))
109 set_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
);
112 static inline void nilfs_mdt_clear_dirty(struct inode
*inode
)
114 clear_bit(NILFS_I_DIRTY
, &NILFS_I(inode
)->i_state
);
117 static inline __u64
nilfs_mdt_cno(struct inode
*inode
)
119 return NILFS_MDT(inode
)->mi_nilfs
->ns_cno
;
122 #define nilfs_mdt_bgl_lock(inode, bg) \
123 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
125 #endif /* _NILFS_MDT_H */