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