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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * mdt.h - NILFS meta data file prototype and definitions
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Ryusuke Konishi.
8 */
9
10#ifndef _NILFS_MDT_H
11#define _NILFS_MDT_H
12
13#include <linux/buffer_head.h>
14#include <linux/blockgroup_lock.h>
15#include "nilfs.h"
16#include "page.h"
17
18/**
19 * struct nilfs_shadow_map - shadow mapping of meta data file
20 * @bmap_store: shadow copy of bmap state
21 * @frozen_data: shadowed dirty data pages
22 * @frozen_btnodes: shadowed dirty b-tree nodes' pages
23 * @frozen_buffers: list of frozen buffers
24 */
25struct nilfs_shadow_map {
26 struct nilfs_bmap_store bmap_store;
27 struct address_space frozen_data;
28 struct address_space frozen_btnodes;
29 struct list_head frozen_buffers;
30};
31
32/**
33 * struct nilfs_mdt_info - on-memory private data of meta data files
34 * @mi_sem: reader/writer semaphore for meta data operations
35 * @mi_bgl: per-blockgroup locking
36 * @mi_entry_size: size of an entry
37 * @mi_first_entry_offset: offset to the first entry
38 * @mi_entries_per_block: number of entries in a block
39 * @mi_palloc_cache: persistent object allocator cache
40 * @mi_shadow: shadow of bmap and page caches
41 * @mi_blocks_per_group: number of blocks in a group
42 * @mi_blocks_per_desc_block: number of blocks per descriptor block
43 */
44struct nilfs_mdt_info {
45 struct rw_semaphore mi_sem;
46 struct blockgroup_lock *mi_bgl;
47 unsigned int mi_entry_size;
48 unsigned int mi_first_entry_offset;
49 unsigned long mi_entries_per_block;
50 struct nilfs_palloc_cache *mi_palloc_cache;
51 struct nilfs_shadow_map *mi_shadow;
52 unsigned long mi_blocks_per_group;
53 unsigned long mi_blocks_per_desc_block;
54};
55
56static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
57{
58 return inode->i_private;
59}
60
61static inline int nilfs_is_metadata_file_inode(const struct inode *inode)
62{
63 return inode->i_private != NULL;
64}
65
66/* Default GFP flags using highmem */
67#define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM)
68
69int nilfs_mdt_get_block(struct inode *, unsigned long, int,
70 void (*init_block)(struct inode *,
71 struct buffer_head *, void *),
72 struct buffer_head **);
73int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
74 unsigned long end, unsigned long *blkoff,
75 struct buffer_head **out_bh);
76int nilfs_mdt_delete_block(struct inode *, unsigned long);
77int nilfs_mdt_forget_block(struct inode *, unsigned long);
78int nilfs_mdt_fetch_dirty(struct inode *);
79
80int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
81void nilfs_mdt_clear(struct inode *inode);
82void nilfs_mdt_destroy(struct inode *inode);
83
84void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int);
85
86int nilfs_mdt_setup_shadow_map(struct inode *inode,
87 struct nilfs_shadow_map *shadow);
88int nilfs_mdt_save_to_shadow_map(struct inode *inode);
89void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
90void nilfs_mdt_clear_shadow_map(struct inode *inode);
91int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
92struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
93 struct buffer_head *bh);
94
95static inline void nilfs_mdt_mark_dirty(struct inode *inode)
96{
97 if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
98 set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
99}
100
101static inline void nilfs_mdt_clear_dirty(struct inode *inode)
102{
103 clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
104}
105
106static inline __u64 nilfs_mdt_cno(struct inode *inode)
107{
108 return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
109}
110
111static inline spinlock_t *
112nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)
113{
114 return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group);
115}
116
117#endif /* _NILFS_MDT_H */