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Ryusuke Konishi5eb563f2009-04-06 19:01:28 -07001/*
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
Vyacheslav Dubeykof5974c82012-07-30 14:42:10 -070031/**
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 */
Ryusuke Konishiebdfed42010-09-06 12:05:43 +090038struct 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
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070045/**
46 * struct nilfs_mdt_info - on-memory private data of meta data files
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070047 * @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
Ryusuke Konishidb38d5a2009-11-14 15:54:27 +090052 * @mi_palloc_cache: persistent object allocator cache
Ryusuke Konishiebdfed42010-09-06 12:05:43 +090053 * @mi_shadow: shadow of bmap and page caches
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070054 * @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 {
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070058 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;
Ryusuke Konishidb38d5a2009-11-14 15:54:27 +090063 struct nilfs_palloc_cache *mi_palloc_cache;
Ryusuke Konishiebdfed42010-09-06 12:05:43 +090064 struct nilfs_shadow_map *mi_shadow;
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070065 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
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070074/* 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
Ryusuke Konishif1e89c82010-09-05 12:20:59 +090086int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070087void nilfs_mdt_set_entry_size(struct inode *, unsigned, unsigned);
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070088
Ryusuke Konishiebdfed42010-09-06 12:05:43 +090089int 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);
Ryusuke Konishib1f6a4f2010-08-31 11:40:34 +090094int 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);
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070097
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -070098static 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{
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900111 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -0700112}
113
114#define nilfs_mdt_bgl_lock(inode, bg) \
115 (&NILFS_MDT(inode)->mi_bgl->locks[(bg) & (NR_BG_LOCKS-1)].lock)
116
Ryusuke Konishi5eb563f2009-04-06 19:01:28 -0700117#endif /* _NILFS_MDT_H */