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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 : */
33 : enum {
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 :
56 : struct ext4_sb_info;
57 : struct ext4_extent;
58 :
59 : struct 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 :
66 : struct ext4_es_tree {
67 : struct rb_root root;
68 : struct extent_status *cache_es; /* recently accessed extent */
69 : };
70 :
71 : struct ext4_es_stats {
72 : unsigned long es_stats_shrunk;
73 : struct percpu_counter es_stats_cache_hits;
74 : struct percpu_counter 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 :
81 : /*
82 : * Pending cluster reservations for bigalloc file systems
83 : *
84 : * A cluster with a pending reservation is a logical cluster shared by at
85 : * least one extent in the extents status tree with delayed and unwritten
86 : * status and at least one other written or unwritten extent. The
87 : * reservation is said to be pending because a cluster reservation would
88 : * have to be taken in the event all blocks in the cluster shared with
89 : * written or unwritten extents were deleted while the delayed and
90 : * unwritten blocks remained.
91 : *
92 : * The set of pending cluster reservations is an auxiliary data structure
93 : * used with the extents status tree to implement reserved cluster/block
94 : * accounting for bigalloc file systems. The set is kept in memory and
95 : * records all pending cluster reservations.
96 : *
97 : * Its primary function is to avoid the need to read extents from the
98 : * disk when invalidating pages as a result of a truncate, punch hole, or
99 : * collapse range operation. Page invalidation requires a decrease in the
100 : * reserved cluster count if it results in the removal of all delayed
101 : * and unwritten extents (blocks) from a cluster that is not shared with a
102 : * written or unwritten extent, and no decrease otherwise. Determining
103 : * whether the cluster is shared can be done by searching for a pending
104 : * reservation on it.
105 : *
106 : * Secondarily, it provides a potentially faster method for determining
107 : * whether the reserved cluster count should be increased when a physical
108 : * cluster is deallocated as a result of a truncate, punch hole, or
109 : * collapse range operation. The necessary information is also present
110 : * in the extents status tree, but might be more rapidly accessed in
111 : * the pending reservation set in many cases due to smaller size.
112 : *
113 : * The pending cluster reservation set is implemented as a red-black tree
114 : * with the goal of minimizing per page search time overhead.
115 : */
116 :
117 : struct pending_reservation {
118 : struct rb_node rb_node;
119 : ext4_lblk_t lclu;
120 : };
121 :
122 : struct ext4_pending_tree {
123 : struct rb_root root;
124 : };
125 :
126 : extern int __init ext4_init_es(void);
127 : extern void ext4_exit_es(void);
128 : extern void ext4_es_init_tree(struct ext4_es_tree *tree);
129 :
130 : extern void ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
131 : ext4_lblk_t len, ext4_fsblk_t pblk,
132 : unsigned int status);
133 : extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
134 : ext4_lblk_t len, ext4_fsblk_t pblk,
135 : unsigned int status);
136 : extern void ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
137 : ext4_lblk_t len);
138 : extern void ext4_es_find_extent_range(struct inode *inode,
139 : int (*match_fn)(struct extent_status *es),
140 : ext4_lblk_t lblk, ext4_lblk_t end,
141 : struct extent_status *es);
142 : extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
143 : ext4_lblk_t *next_lblk,
144 : struct extent_status *es);
145 : extern bool ext4_es_scan_range(struct inode *inode,
146 : int (*matching_fn)(struct extent_status *es),
147 : ext4_lblk_t lblk, ext4_lblk_t end);
148 : extern bool ext4_es_scan_clu(struct inode *inode,
149 : int (*matching_fn)(struct extent_status *es),
150 : ext4_lblk_t lblk);
151 :
152 : static inline unsigned int ext4_es_status(struct extent_status *es)
153 : {
154 99498832 : return es->es_pblk >> ES_SHIFT;
155 : }
156 :
157 : static inline unsigned int ext4_es_type(struct extent_status *es)
158 : {
159 306967050 : return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT;
160 : }
161 :
162 : static inline int ext4_es_is_written(struct extent_status *es)
163 : {
164 131286826 : return (ext4_es_type(es) & EXTENT_STATUS_WRITTEN) != 0;
165 : }
166 :
167 : static inline int ext4_es_is_unwritten(struct extent_status *es)
168 : {
169 124676361 : return (ext4_es_type(es) & EXTENT_STATUS_UNWRITTEN) != 0;
170 : }
171 :
172 6788866 : static inline int ext4_es_is_delayed(struct extent_status *es)
173 : {
174 88707530 : return (ext4_es_type(es) & EXTENT_STATUS_DELAYED) != 0;
175 : }
176 :
177 : static inline int ext4_es_is_hole(struct extent_status *es)
178 : {
179 86707593 : return (ext4_es_type(es) & EXTENT_STATUS_HOLE) != 0;
180 : }
181 :
182 8194 : static inline int ext4_es_is_mapped(struct extent_status *es)
183 : {
184 8194 : return (ext4_es_is_written(es) || ext4_es_is_unwritten(es));
185 : }
186 :
187 131127 : static inline int ext4_es_is_delonly(struct extent_status *es)
188 : {
189 11765473 : return (ext4_es_is_delayed(es) && !ext4_es_is_unwritten(es));
190 : }
191 :
192 : static inline void ext4_es_set_referenced(struct extent_status *es)
193 : {
194 5676798 : es->es_pblk |= ((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT;
195 5676798 : }
196 :
197 : static inline void ext4_es_clear_referenced(struct extent_status *es)
198 : {
199 25524 : es->es_pblk &= ~(((ext4_fsblk_t)EXTENT_STATUS_REFERENCED) << ES_SHIFT);
200 : }
201 :
202 : static inline int ext4_es_is_referenced(struct extent_status *es)
203 : {
204 99498832 : return (ext4_es_status(es) & EXTENT_STATUS_REFERENCED) != 0;
205 : }
206 :
207 : static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
208 : {
209 46108886 : return es->es_pblk & ~ES_MASK;
210 : }
211 :
212 : static inline ext4_fsblk_t ext4_es_show_pblock(struct extent_status *es)
213 : {
214 0 : ext4_fsblk_t pblock = ext4_es_pblock(es);
215 0 : return pblock == ~ES_MASK ? 0 : pblock;
216 : }
217 :
218 : static inline void ext4_es_store_pblock(struct extent_status *es,
219 : ext4_fsblk_t pb)
220 : {
221 1590392 : ext4_fsblk_t block;
222 :
223 1590392 : block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
224 1590392 : es->es_pblk = block;
225 1590392 : }
226 :
227 : static inline void ext4_es_store_status(struct extent_status *es,
228 : unsigned int status)
229 : {
230 : es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
231 : (es->es_pblk & ~ES_MASK);
232 : }
233 :
234 : static inline void ext4_es_store_pblock_status(struct extent_status *es,
235 : ext4_fsblk_t pb,
236 : unsigned int status)
237 : {
238 24650010 : es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) |
239 16046977 : (pb & ~ES_MASK);
240 : }
241 :
242 : extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
243 : extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
244 :
245 : extern int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v);
246 :
247 : extern int __init ext4_init_pending(void);
248 : extern void ext4_exit_pending(void);
249 : extern void ext4_init_pending_tree(struct ext4_pending_tree *tree);
250 : extern void ext4_remove_pending(struct inode *inode, ext4_lblk_t lblk);
251 : extern bool ext4_is_pending(struct inode *inode, ext4_lblk_t lblk);
252 : extern void ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
253 : bool allocated);
254 : extern unsigned int ext4_es_delayed_clu(struct inode *inode, ext4_lblk_t lblk,
255 : ext4_lblk_t len);
256 : extern void ext4_clear_inode_es(struct inode *inode);
257 :
258 : #endif /* _EXT4_EXTENTS_STATUS_H */
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