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ae98043f | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
5eb563f5 RK |
2 | /* |
3 | * mdt.h - NILFS meta data file prototype and definitions | |
4 | * | |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Ryusuke Konishi. |
5eb563f5 RK |
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 | ||
f5974c8f VD |
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 | */ | |
ebdfed4d RK |
25 | struct 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 | ||
5eb563f5 RK |
32 | /** |
33 | * struct nilfs_mdt_info - on-memory private data of meta data files | |
5eb563f5 RK |
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 | |
db38d5ad | 39 | * @mi_palloc_cache: persistent object allocator cache |
ebdfed4d | 40 | * @mi_shadow: shadow of bmap and page caches |
5eb563f5 RK |
41 | * @mi_blocks_per_group: number of blocks in a group |
42 | * @mi_blocks_per_desc_block: number of blocks per descriptor block | |
43 | */ | |
44 | struct nilfs_mdt_info { | |
5eb563f5 RK |
45 | struct rw_semaphore mi_sem; |
46 | struct blockgroup_lock *mi_bgl; | |
0c6c44cb RK |
47 | unsigned int mi_entry_size; |
48 | unsigned int mi_first_entry_offset; | |
5eb563f5 | 49 | unsigned long mi_entries_per_block; |
db38d5ad | 50 | struct nilfs_palloc_cache *mi_palloc_cache; |
ebdfed4d | 51 | struct nilfs_shadow_map *mi_shadow; |
5eb563f5 RK |
52 | unsigned long mi_blocks_per_group; |
53 | unsigned long mi_blocks_per_desc_block; | |
54 | }; | |
55 | ||
56 | static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode) | |
57 | { | |
58 | return inode->i_private; | |
59 | } | |
60 | ||
2d19961d RK |
61 | static inline int nilfs_is_metadata_file_inode(const struct inode *inode) |
62 | { | |
63 | return inode->i_private != NULL; | |
64 | } | |
65 | ||
5eb563f5 | 66 | /* Default GFP flags using highmem */ |
71baba4b | 67 | #define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM) |
5eb563f5 RK |
68 | |
69 | int nilfs_mdt_get_block(struct inode *, unsigned long, int, | |
70 | void (*init_block)(struct inode *, | |
71 | struct buffer_head *, void *), | |
72 | struct buffer_head **); | |
fa33915c RK |
73 | int nilfs_mdt_find_block(struct inode *inode, unsigned long start, |
74 | unsigned long end, unsigned long *blkoff, | |
75 | struct buffer_head **out_bh); | |
5eb563f5 RK |
76 | int nilfs_mdt_delete_block(struct inode *, unsigned long); |
77 | int nilfs_mdt_forget_block(struct inode *, unsigned long); | |
5eb563f5 RK |
78 | int nilfs_mdt_fetch_dirty(struct inode *); |
79 | ||
f1e89c86 | 80 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz); |
2d19961d RK |
81 | void nilfs_mdt_clear(struct inode *inode); |
82 | void nilfs_mdt_destroy(struct inode *inode); | |
83 | ||
0c6c44cb | 84 | void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int); |
5eb563f5 | 85 | |
ebdfed4d RK |
86 | int nilfs_mdt_setup_shadow_map(struct inode *inode, |
87 | struct nilfs_shadow_map *shadow); | |
88 | int nilfs_mdt_save_to_shadow_map(struct inode *inode); | |
89 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode); | |
90 | void nilfs_mdt_clear_shadow_map(struct inode *inode); | |
b1f6a4f2 RK |
91 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh); |
92 | struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode, | |
93 | struct buffer_head *bh); | |
5eb563f5 | 94 | |
5eb563f5 RK |
95 | static 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 | ||
101 | static inline void nilfs_mdt_clear_dirty(struct inode *inode) | |
102 | { | |
103 | clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state); | |
104 | } | |
105 | ||
106 | static inline __u64 nilfs_mdt_cno(struct inode *inode) | |
107 | { | |
0ef28f9a | 108 | return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno; |
5eb563f5 RK |
109 | } |
110 | ||
0de6d6b9 RK |
111 | static inline spinlock_t * |
112 | nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group) | |
113 | { | |
114 | return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group); | |
115 | } | |
5eb563f5 | 116 | |
5eb563f5 | 117 | #endif /* _NILFS_MDT_H */ |