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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};
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48
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
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
111