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Zheng Liuc0677e62012-11-08 15:18:54 -05001/*
2 * fs/ext4/extents_status.h
3 *
4 * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
5 * Modified by
6 * Allison Henderson <achender@linux.vnet.ibm.com>
7 * Zheng Liu <wenqing.lz@taobao.com>
8 *
9 */
10
11#ifndef _EXT4_EXTENTS_STATUS_H
12#define _EXT4_EXTENTS_STATUS_H
13
Zheng Liu654598b2012-11-08 21:57:20 -050014/*
15 * Turn on ES_DEBUG__ to get lots of info about extent status operations.
16 */
17#ifdef ES_DEBUG__
18#define es_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
19#else
20#define es_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
21#endif
22
Theodore Ts'o8e919d12013-02-27 14:54:37 -050023/*
Dmitry Monakhov921f2662013-03-10 21:01:03 -040024 * With ES_AGGRESSIVE_TEST defined, the result of es caching will be
25 * checked with old map_block's result.
26 */
27#define ES_AGGRESSIVE_TEST__
28
29/*
Theodore Ts'o8e919d12013-02-27 14:54:37 -050030 * These flags live in the high bits of extent_status.es_pblk
31 */
Jan Kara624d0f12014-11-25 11:53:47 -050032enum {
33 ES_WRITTEN_B,
34 ES_UNWRITTEN_B,
35 ES_DELAYED_B,
36 ES_HOLE_B,
Jan Kara2be12de2014-11-25 11:55:24 -050037 ES_REFERENCED_B,
Jan Kara624d0f12014-11-25 11:53:47 -050038 ES_FLAGS
39};
Theodore Ts'o3be78c72013-08-16 21:22:41 -040040
Jan Kara624d0f12014-11-25 11:53:47 -050041#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS)
42#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT)
Zheng Liufdc02122013-02-18 00:26:51 -050043
Jan Kara624d0f12014-11-25 11:53:47 -050044#define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B)
45#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B)
46#define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B)
47#define EXTENT_STATUS_HOLE (1 << ES_HOLE_B)
Jan Kara2be12de2014-11-25 11:55:24 -050048#define EXTENT_STATUS_REFERENCED (1 << ES_REFERENCED_B)
49
50#define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \
51 EXTENT_STATUS_UNWRITTEN | \
52 EXTENT_STATUS_DELAYED | \
53 EXTENT_STATUS_HOLE) << ES_SHIFT)
Theodore Ts'o3be78c72013-08-16 21:22:41 -040054
Zheng Liud3922a72013-07-01 08:12:37 -040055struct ext4_sb_info;
Zheng Liuadb23552013-03-10 21:13:05 -040056struct ext4_extent;
57
Zheng Liuc0677e62012-11-08 15:18:54 -050058struct extent_status {
59 struct rb_node rb_node;
Zheng Liu06b0c882013-02-18 00:26:51 -050060 ext4_lblk_t es_lblk; /* first logical block extent covers */
61 ext4_lblk_t es_len; /* length of extent in block */
Zheng Liufdc02122013-02-18 00:26:51 -050062 ext4_fsblk_t es_pblk; /* first physical block */
Zheng Liuc0677e62012-11-08 15:18:54 -050063};
64
65struct ext4_es_tree {
66 struct rb_root root;
67 struct extent_status *cache_es; /* recently accessed extent */
68};
69
Zheng Liueb68d0e2014-09-01 22:26:49 -040070struct ext4_es_stats {
Zheng Liueb68d0e2014-09-01 22:26:49 -040071 unsigned long es_stats_shrunk;
72 unsigned long es_stats_cache_hits;
73 unsigned long es_stats_cache_misses;
74 u64 es_stats_scan_time;
75 u64 es_stats_max_scan_time;
76 struct percpu_counter es_stats_all_cnt;
Zheng Liuedaa53c2014-11-25 11:45:37 -050077 struct percpu_counter es_stats_shk_cnt;
Zheng Liueb68d0e2014-09-01 22:26:49 -040078};
79
Zheng Liu654598b2012-11-08 21:57:20 -050080extern int __init ext4_init_es(void);
81extern void ext4_exit_es(void);
82extern void ext4_es_init_tree(struct ext4_es_tree *tree);
83
Zheng Liu06b0c882013-02-18 00:26:51 -050084extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
Zheng Liufdc02122013-02-18 00:26:51 -050085 ext4_lblk_t len, ext4_fsblk_t pblk,
Theodore Ts'o3be78c72013-08-16 21:22:41 -040086 unsigned int status);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -040087extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
88 ext4_lblk_t len, ext4_fsblk_t pblk,
89 unsigned int status);
Zheng Liu06b0c882013-02-18 00:26:51 -050090extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
Zheng Liu654598b2012-11-08 21:57:20 -050091 ext4_lblk_t len);
Yan, Zhenge30b5dc2013-05-03 02:15:52 -040092extern void ext4_es_find_delayed_extent_range(struct inode *inode,
93 ext4_lblk_t lblk, ext4_lblk_t end,
Zheng Liube401362013-02-18 00:27:26 -050094 struct extent_status *es);
Zheng Liud100eef2013-02-18 00:29:59 -050095extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
96 struct extent_status *es);
Zheng Liu654598b2012-11-08 21:57:20 -050097
Jan Kara624d0f12014-11-25 11:53:47 -050098static inline unsigned int ext4_es_status(struct extent_status *es)
99{
100 return es->es_pblk >> ES_SHIFT;
101}
102
Jan Kara2be12de2014-11-25 11:55:24 -0500103static inline unsigned int ext4_es_type(struct extent_status *es)
104{
105 return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
106}
107
Zheng Liufdc02122013-02-18 00:26:51 -0500108static inline int ext4_es_is_written(struct extent_status *es)
109{
Jan Kara2be12de2014-11-25 11:55:24 -0500110 return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -0500111}
112
113static inline int ext4_es_is_unwritten(struct extent_status *es)
114{
Jan Kara2be12de2014-11-25 11:55:24 -0500115 return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -0500116}
117
118static inline int ext4_es_is_delayed(struct extent_status *es)
119{
Jan Kara2be12de2014-11-25 11:55:24 -0500120 return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -0500121}
122
123static inline int ext4_es_is_hole(struct extent_status *es)
124{
Jan Kara2be12de2014-11-25 11:55:24 -0500125 return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
126}
127
128static inline void ext4_es_set_referenced(struct extent_status *es)
129{
130 es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
131}
132
133static inline void ext4_es_clear_referenced(struct extent_status *es)
134{
135 es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
136}
137
138static inline int ext4_es_is_referenced(struct extent_status *es)
139{
140 return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
Zheng Liufdc02122013-02-18 00:26:51 -0500141}
142
143static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
144{
Theodore Ts'o3be78c72013-08-16 21:22:41 -0400145 return es->es_pblk & ~ES_MASK;
Zheng Liufdc02122013-02-18 00:26:51 -0500146}
147
148static inline void ext4_es_store_pblock(struct extent_status *es,
149 ext4_fsblk_t pb)
150{
151 ext4_fsblk_t block;
152
Theodore Ts'o3be78c72013-08-16 21:22:41 -0400153 block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
Zheng Liufdc02122013-02-18 00:26:51 -0500154 es->es_pblk = block;
155}
156
157static inline void ext4_es_store_status(struct extent_status *es,
Theodore Ts'o3be78c72013-08-16 21:22:41 -0400158 unsigned int status)
Zheng Liufdc02122013-02-18 00:26:51 -0500159{
Jan Kara624d0f12014-11-25 11:53:47 -0500160 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
161 (es->es_pblk & ~ES_MASK);
Zheng Liufdc02122013-02-18 00:26:51 -0500162}
163
Theodore Ts'o9a6633b2014-02-19 20:15:15 -0500164static inline void ext4_es_store_pblock_status(struct extent_status *es,
165 ext4_fsblk_t pb,
166 unsigned int status)
167{
Jan Kara624d0f12014-11-25 11:53:47 -0500168 es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
169 (pb & ~ES_MASK);
Theodore Ts'o9a6633b2014-02-19 20:15:15 -0500170}
171
Zheng Liueb68d0e2014-09-01 22:26:49 -0400172extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
Zheng Liud3922a72013-07-01 08:12:37 -0400173extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
Zheng Liu74cd15c2013-02-18 00:32:55 -0500174
Zheng Liuc0677e62012-11-08 15:18:54 -0500175#endif /* _EXT4_EXTENTS_STATUS_H */