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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 * Written by Ryusuke Konishi.
17 */
18
19#ifndef _NILFS_MDT_H
20#define _NILFS_MDT_H
21
22#include <linux/buffer_head.h>
23#include <linux/blockgroup_lock.h>
24#include "nilfs.h"
25#include "page.h"
26
27/**
28 * struct nilfs_shadow_map - shadow mapping of meta data file
29 * @bmap_store: shadow copy of bmap state
30 * @frozen_data: shadowed dirty data pages
31 * @frozen_btnodes: shadowed dirty b-tree nodes' pages
32 * @frozen_buffers: list of frozen buffers
33 */
34struct nilfs_shadow_map {
35 struct nilfs_bmap_store bmap_store;
36 struct address_space frozen_data;
37 struct address_space frozen_btnodes;
38 struct list_head frozen_buffers;
39};
40
41/**
42 * struct nilfs_mdt_info - on-memory private data of meta data files
43 * @mi_sem: reader/writer semaphore for meta data operations
44 * @mi_bgl: per-blockgroup locking
45 * @mi_entry_size: size of an entry
46 * @mi_first_entry_offset: offset to the first entry
47 * @mi_entries_per_block: number of entries in a block
48 * @mi_palloc_cache: persistent object allocator cache
49 * @mi_shadow: shadow of bmap and page caches
50 * @mi_blocks_per_group: number of blocks in a group
51 * @mi_blocks_per_desc_block: number of blocks per descriptor block
52 */
53struct nilfs_mdt_info {
54 struct rw_semaphore mi_sem;
55 struct blockgroup_lock *mi_bgl;
56 unsigned int mi_entry_size;
57 unsigned int mi_first_entry_offset;
58 unsigned long mi_entries_per_block;
59 struct nilfs_palloc_cache *mi_palloc_cache;
60 struct nilfs_shadow_map *mi_shadow;
61 unsigned long mi_blocks_per_group;
62 unsigned long mi_blocks_per_desc_block;
63};
64
65static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
66{
67 return inode->i_private;
68}
69
70static inline int nilfs_is_metadata_file_inode(const struct inode *inode)
71{
72 return inode->i_private != NULL;
73}
74
75/* Default GFP flags using highmem */
76#define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM)
77
78int nilfs_mdt_get_block(struct inode *, unsigned long, int,
79 void (*init_block)(struct inode *,
80 struct buffer_head *, void *),
81 struct buffer_head **);
82int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
83 unsigned long end, unsigned long *blkoff,
84 struct buffer_head **out_bh);
85int nilfs_mdt_delete_block(struct inode *, unsigned long);
86int nilfs_mdt_forget_block(struct inode *, unsigned long);
87int nilfs_mdt_fetch_dirty(struct inode *);
88
89int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
90void nilfs_mdt_clear(struct inode *inode);
91void nilfs_mdt_destroy(struct inode *inode);
92
93void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int);
94
95int nilfs_mdt_setup_shadow_map(struct inode *inode,
96 struct nilfs_shadow_map *shadow);
97int nilfs_mdt_save_to_shadow_map(struct inode *inode);
98void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
99void nilfs_mdt_clear_shadow_map(struct inode *inode);
100int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
101struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
102 struct buffer_head *bh);
103
104static inline void nilfs_mdt_mark_dirty(struct inode *inode)
105{
106 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
107 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
108}
109
110static inline void nilfs_mdt_clear_dirty(struct inode *inode)
111{
112 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
113}
114
115static inline __u64 nilfs_mdt_cno(struct inode *inode)
116{
117 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
118}
119
120static inline spinlock_t *
121nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)
122{
123 return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group);
124}
125
126#endif /* _NILFS_MDT_H */
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
31struct 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;
36};
37
38/**
39 * struct nilfs_mdt_info - on-memory private data of meta data files
40 * @mi_sem: reader/writer semaphore for meta data operations
41 * @mi_bgl: per-blockgroup locking
42 * @mi_entry_size: size of an entry
43 * @mi_first_entry_offset: offset to the first entry
44 * @mi_entries_per_block: number of entries in a block
45 * @mi_palloc_cache: persistent object allocator cache
46 * @mi_shadow: shadow of bmap and page caches
47 * @mi_blocks_per_group: number of blocks in a group
48 * @mi_blocks_per_desc_block: number of blocks per descriptor block
49 */
50struct nilfs_mdt_info {
51 struct rw_semaphore mi_sem;
52 struct blockgroup_lock *mi_bgl;
53 unsigned mi_entry_size;
54 unsigned mi_first_entry_offset;
55 unsigned long mi_entries_per_block;
56 struct nilfs_palloc_cache *mi_palloc_cache;
57 struct nilfs_shadow_map *mi_shadow;
58 unsigned long mi_blocks_per_group;
59 unsigned long mi_blocks_per_desc_block;
60};
61
62static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
63{
64 return inode->i_private;
65}
66
67/* Default GFP flags using highmem */
68#define NILFS_MDT_GFP (__GFP_WAIT | __GFP_IO | __GFP_HIGHMEM)
69
70int nilfs_mdt_get_block(struct inode *, unsigned long, int,
71 void (*init_block)(struct inode *,
72 struct buffer_head *, void *),
73 struct buffer_head **);
74int nilfs_mdt_delete_block(struct inode *, unsigned long);
75int nilfs_mdt_forget_block(struct inode *, unsigned long);
76int nilfs_mdt_mark_block_dirty(struct inode *, unsigned long);
77int nilfs_mdt_fetch_dirty(struct inode *);
78
79int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
80void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
81
82int nilfs_mdt_setup_shadow_map(struct inode *inode,
83 struct nilfs_shadow_map *shadow);
84int nilfs_mdt_save_to_shadow_map(struct inode *inode);
85void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
86void nilfs_mdt_clear_shadow_map(struct inode *inode);
87int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
88struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
89 struct buffer_head *bh);
90
91static inline void nilfs_mdt_mark_dirty(struct inode *inode)
92{
93 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
94 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
95}
96
97static inline void nilfs_mdt_clear_dirty(struct inode *inode)
98{
99 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
100}
101
102static inline __u64 nilfs_mdt_cno(struct inode *inode)
103{
104 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
105}
106
107#define nilfs_mdt_bgl_lock(inode, bg) \
108 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
109
110#endif /* _NILFS_MDT_H */