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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * fs/ext4/extents_status.h
4 *
5 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
6 * Modified by
7 * Allison Henderson <achender@linux.vnet.ibm.com>
8 * Zheng Liu <wenqing.lz@taobao.com>
9 *
10 */
11
12#ifndef _EXT4_EXTENTS_STATUS_H
13#define _EXT4_EXTENTS_STATUS_H
14
15/*
16 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
17 */
18#ifdef ES_DEBUG__
19#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
20#else
21#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
22#endif
23
24/*
25 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
26 * checked with old map_block's result.
27 */
28#define ES_AGGRESSIVE_TEST__
29
30/*
31 * These flags live in the high bits of extent_status.es_pblk
32 */
33enum {
34 ES_WRITTEN_B,
35 ES_UNWRITTEN_B,
36 ES_DELAYED_B,
37 ES_HOLE_B,
38 ES_REFERENCED_B,
39 ES_FLAGS
40};
41
42#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
43#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
44
45#define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B)
46#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
47#define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B)
48#define EXTENT_STATUS_HOLE (1 << ES_HOLE_B)
49#define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B)
50
51#define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
52 EXTENT_STATUS_UNWRITTEN | \
53 EXTENT_STATUS_DELAYED | \
54 EXTENT_STATUS_HOLE) << ES_SHIFT)
55
56struct ext4_sb_info;
57struct ext4_extent;
58
59struct extent_status {
60 struct rb_node rb_node;
61 ext4_lblk_t es_lblk; /* first logical block extent covers */
62 ext4_lblk_t es_len; /* length of extent in block */
63 ext4_fsblk_t es_pblk; /* first physical block */
64};
65
66struct ext4_es_tree {
67 struct rb_root root;
68 struct extent_status *cache_es; /* recently accessed extent */
69};
70
71struct ext4_es_stats {
72 unsigned long es_stats_shrunk;
73 unsigned long es_stats_cache_hits;
74 unsigned long es_stats_cache_misses;
75 u64 es_stats_scan_time;
76 u64 es_stats_max_scan_time;
77 struct percpu_counter es_stats_all_cnt;
78 struct percpu_counter es_stats_shk_cnt;
79};
80
81extern int __init ext4_init_es(void);
82extern void ext4_exit_es(void);
83extern void ext4_es_init_tree(struct ext4_es_tree *tree);
84
85extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
86 ext4_lblk_t len, ext4_fsblk_t pblk,
87 unsigned int status);
88extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
89 ext4_lblk_t len, ext4_fsblk_t pblk,
90 unsigned int status);
91extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
92 ext4_lblk_t len);
93extern void ext4_es_find_delayed_extent_range(struct inode *inode,
94 ext4_lblk_t lblk, ext4_lblk_t end,
95 struct extent_status *es);
96extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
97 struct extent_status *es);
98
99static inline unsigned int ext4_es_status(struct extent_status *es)
100{
101 return es->es_pblk >> ES_SHIFT;
102}
103
104static inline unsigned int ext4_es_type(struct extent_status *es)
105{
106 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
107}
108
109static inline int ext4_es_is_written(struct extent_status *es)
110{
111 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
112}
113
114static inline int ext4_es_is_unwritten(struct extent_status *es)
115{
116 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
117}
118
119static inline int ext4_es_is_delayed(struct extent_status *es)
120{
121 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
122}
123
124static inline int ext4_es_is_hole(struct extent_status *es)
125{
126 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
127}
128
129static inline void ext4_es_set_referenced(struct extent_status *es)
130{
131 es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
132}
133
134static inline void ext4_es_clear_referenced(struct extent_status *es)
135{
136 es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
137}
138
139static inline int ext4_es_is_referenced(struct extent_status *es)
140{
141 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
142}
143
144static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
145{
146 return es->es_pblk & ~ES_MASK;
147}
148
149static inline void ext4_es_store_pblock(struct extent_status *es,
150 ext4_fsblk_t pb)
151{
152 ext4_fsblk_t block;
153
154 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
155 es->es_pblk = block;
156}
157
158static inline void ext4_es_store_status(struct extent_status *es,
159 unsigned int status)
160{
161 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
162 (es->es_pblk & ~ES_MASK);
163}
164
165static inline void ext4_es_store_pblock_status(struct extent_status *es,
166 ext4_fsblk_t pb,
167 unsigned int status)
168{
169 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
170 (pb & ~ES_MASK);
171}
172
173extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
174extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
175
176extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
177
178#endif /* _EXT4_EXTENTS_STATUS_H */