1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * mdt.h - NILFS meta data file prototype and definitions
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Written by Ryusuke Konishi.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #ifndef _NILFS_MDT_H
11*4882a593Smuzhiyun #define _NILFS_MDT_H
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/buffer_head.h>
14*4882a593Smuzhiyun #include <linux/blockgroup_lock.h>
15*4882a593Smuzhiyun #include "nilfs.h"
16*4882a593Smuzhiyun #include "page.h"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /**
19*4882a593Smuzhiyun * struct nilfs_shadow_map - shadow mapping of meta data file
20*4882a593Smuzhiyun * @bmap_store: shadow copy of bmap state
21*4882a593Smuzhiyun * @inode: holder of page caches used in shadow mapping
22*4882a593Smuzhiyun * @frozen_buffers: list of frozen buffers
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun struct nilfs_shadow_map {
25*4882a593Smuzhiyun struct nilfs_bmap_store bmap_store;
26*4882a593Smuzhiyun struct inode *inode;
27*4882a593Smuzhiyun struct list_head frozen_buffers;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /**
31*4882a593Smuzhiyun * struct nilfs_mdt_info - on-memory private data of meta data files
32*4882a593Smuzhiyun * @mi_sem: reader/writer semaphore for meta data operations
33*4882a593Smuzhiyun * @mi_bgl: per-blockgroup locking
34*4882a593Smuzhiyun * @mi_entry_size: size of an entry
35*4882a593Smuzhiyun * @mi_first_entry_offset: offset to the first entry
36*4882a593Smuzhiyun * @mi_entries_per_block: number of entries in a block
37*4882a593Smuzhiyun * @mi_palloc_cache: persistent object allocator cache
38*4882a593Smuzhiyun * @mi_shadow: shadow of bmap and page caches
39*4882a593Smuzhiyun * @mi_blocks_per_group: number of blocks in a group
40*4882a593Smuzhiyun * @mi_blocks_per_desc_block: number of blocks per descriptor block
41*4882a593Smuzhiyun */
42*4882a593Smuzhiyun struct nilfs_mdt_info {
43*4882a593Smuzhiyun struct rw_semaphore mi_sem;
44*4882a593Smuzhiyun struct blockgroup_lock *mi_bgl;
45*4882a593Smuzhiyun unsigned int mi_entry_size;
46*4882a593Smuzhiyun unsigned int mi_first_entry_offset;
47*4882a593Smuzhiyun unsigned long mi_entries_per_block;
48*4882a593Smuzhiyun struct nilfs_palloc_cache *mi_palloc_cache;
49*4882a593Smuzhiyun struct nilfs_shadow_map *mi_shadow;
50*4882a593Smuzhiyun unsigned long mi_blocks_per_group;
51*4882a593Smuzhiyun unsigned long mi_blocks_per_desc_block;
52*4882a593Smuzhiyun };
53*4882a593Smuzhiyun
NILFS_MDT(const struct inode * inode)54*4882a593Smuzhiyun static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun return inode->i_private;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
nilfs_is_metadata_file_inode(const struct inode * inode)59*4882a593Smuzhiyun static inline int nilfs_is_metadata_file_inode(const struct inode *inode)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun return inode->i_private != NULL;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun /* Default GFP flags using highmem */
65*4882a593Smuzhiyun #define NILFS_MDT_GFP (__GFP_RECLAIM | __GFP_IO | __GFP_HIGHMEM)
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun int nilfs_mdt_get_block(struct inode *, unsigned long, int,
68*4882a593Smuzhiyun void (*init_block)(struct inode *,
69*4882a593Smuzhiyun struct buffer_head *, void *),
70*4882a593Smuzhiyun struct buffer_head **);
71*4882a593Smuzhiyun int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
72*4882a593Smuzhiyun unsigned long end, unsigned long *blkoff,
73*4882a593Smuzhiyun struct buffer_head **out_bh);
74*4882a593Smuzhiyun int nilfs_mdt_delete_block(struct inode *, unsigned long);
75*4882a593Smuzhiyun int nilfs_mdt_forget_block(struct inode *, unsigned long);
76*4882a593Smuzhiyun int nilfs_mdt_fetch_dirty(struct inode *);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz);
79*4882a593Smuzhiyun void nilfs_mdt_clear(struct inode *inode);
80*4882a593Smuzhiyun void nilfs_mdt_destroy(struct inode *inode);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun void nilfs_mdt_set_entry_size(struct inode *, unsigned int, unsigned int);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun int nilfs_mdt_setup_shadow_map(struct inode *inode,
85*4882a593Smuzhiyun struct nilfs_shadow_map *shadow);
86*4882a593Smuzhiyun int nilfs_mdt_save_to_shadow_map(struct inode *inode);
87*4882a593Smuzhiyun void nilfs_mdt_restore_from_shadow_map(struct inode *inode);
88*4882a593Smuzhiyun void nilfs_mdt_clear_shadow_map(struct inode *inode);
89*4882a593Smuzhiyun int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh);
90*4882a593Smuzhiyun struct buffer_head *nilfs_mdt_get_frozen_buffer(struct inode *inode,
91*4882a593Smuzhiyun struct buffer_head *bh);
92*4882a593Smuzhiyun
nilfs_mdt_mark_dirty(struct inode * inode)93*4882a593Smuzhiyun static inline void nilfs_mdt_mark_dirty(struct inode *inode)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun if (!test_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state))
96*4882a593Smuzhiyun set_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
nilfs_mdt_clear_dirty(struct inode * inode)99*4882a593Smuzhiyun static inline void nilfs_mdt_clear_dirty(struct inode *inode)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun clear_bit(NILFS_I_DIRTY, &NILFS_I(inode)->i_state);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
nilfs_mdt_cno(struct inode * inode)104*4882a593Smuzhiyun static inline __u64 nilfs_mdt_cno(struct inode *inode)
105*4882a593Smuzhiyun {
106*4882a593Smuzhiyun return ((struct the_nilfs *)inode->i_sb->s_fs_info)->ns_cno;
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun static inline spinlock_t *
nilfs_mdt_bgl_lock(struct inode * inode,unsigned int block_group)110*4882a593Smuzhiyun nilfs_mdt_bgl_lock(struct inode *inode, unsigned int block_group)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun return bgl_lock_ptr(NILFS_MDT(inode)->mi_bgl, block_group);
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun #endif /* _NILFS_MDT_H */
116