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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/f2fs/gc.h
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8#define GC_THREAD_MIN_WB_PAGES 1 /*
9 * a threshold to determine
10 * whether IO subsystem is idle
11 * or not
12 */
13#define DEF_GC_THREAD_URGENT_SLEEP_TIME 500 /* 500 ms */
14#define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
15#define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
16#define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
17#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
18#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
19
20#define DEF_GC_FAILED_PINNED_FILES 2048
21
22/* Search max. number of dirty segments to select a victim segment */
23#define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
24
25struct f2fs_gc_kthread {
26 struct task_struct *f2fs_gc_task;
27 wait_queue_head_t gc_wait_queue_head;
28
29 /* for gc sleep time */
30 unsigned int urgent_sleep_time;
31 unsigned int min_sleep_time;
32 unsigned int max_sleep_time;
33 unsigned int no_gc_sleep_time;
34
35 /* for changing gc mode */
36 unsigned int gc_wake;
37};
38
39struct gc_inode_list {
40 struct list_head ilist;
41 struct radix_tree_root iroot;
42};
43
44/*
45 * inline functions
46 */
47static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
48{
49 if (free_segments(sbi) < overprovision_segments(sbi))
50 return 0;
51 else
52 return (free_segments(sbi) - overprovision_segments(sbi))
53 << sbi->log_blocks_per_seg;
54}
55
56static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
57{
58 return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
59}
60
61static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
62{
63 block_t reclaimable_user_blocks = sbi->user_block_count -
64 written_block_count(sbi);
65 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
66}
67
68static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
69 unsigned int *wait)
70{
71 unsigned int min_time = gc_th->min_sleep_time;
72 unsigned int max_time = gc_th->max_sleep_time;
73
74 if (*wait == gc_th->no_gc_sleep_time)
75 return;
76
77 if ((long long)*wait + (long long)min_time > (long long)max_time)
78 *wait = max_time;
79 else
80 *wait += min_time;
81}
82
83static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
84 unsigned int *wait)
85{
86 unsigned int min_time = gc_th->min_sleep_time;
87
88 if (*wait == gc_th->no_gc_sleep_time)
89 *wait = gc_th->max_sleep_time;
90
91 if ((long long)*wait - (long long)min_time < (long long)min_time)
92 *wait = min_time;
93 else
94 *wait -= min_time;
95}
96
97static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
98{
99 block_t invalid_user_blocks = sbi->user_block_count -
100 written_block_count(sbi);
101 /*
102 * Background GC is triggered with the following conditions.
103 * 1. There are a number of invalid blocks.
104 * 2. There is not enough free space.
105 */
106 if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
107 free_user_blocks(sbi) < limit_free_user_blocks(sbi))
108 return true;
109 return false;
110}
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * fs/f2fs/gc.h
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8#define GC_THREAD_MIN_WB_PAGES 1 /*
9 * a threshold to determine
10 * whether IO subsystem is idle
11 * or not
12 */
13#define DEF_GC_THREAD_URGENT_SLEEP_TIME 500 /* 500 ms */
14#define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
15#define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
16#define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
17
18/* GC sleep parameters for zoned deivces */
19#define DEF_GC_THREAD_MIN_SLEEP_TIME_ZONED 10
20#define DEF_GC_THREAD_MAX_SLEEP_TIME_ZONED 20
21#define DEF_GC_THREAD_NOGC_SLEEP_TIME_ZONED 60000
22
23/* choose candidates from sections which has age of more than 7 days */
24#define DEF_GC_THREAD_AGE_THRESHOLD (60 * 60 * 24 * 7)
25#define DEF_GC_THREAD_CANDIDATE_RATIO 20 /* select 20% oldest sections as candidates */
26#define DEF_GC_THREAD_MAX_CANDIDATE_COUNT 10 /* select at most 10 sections as candidates */
27#define DEF_GC_THREAD_AGE_WEIGHT 60 /* age weight */
28#define DEF_GC_THREAD_VALID_THRESH_RATIO 95 /* do not GC over 95% valid block ratio for one time GC */
29#define DEFAULT_ACCURACY_CLASS 10000 /* accuracy class */
30
31#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
32#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
33
34#define LIMIT_NO_ZONED_GC 60 /* percentage over total user space of no gc for zoned devices */
35#define LIMIT_BOOST_ZONED_GC 25 /* percentage over total user space of boosted gc for zoned devices */
36#define DEF_MIGRATION_WINDOW_GRANULARITY_ZONED 3
37#define BOOST_GC_MULTIPLE 5
38#define ZONED_PIN_SEC_REQUIRED_COUNT 1
39
40#define DEF_GC_FAILED_PINNED_FILES 2048
41#define MAX_GC_FAILED_PINNED_FILES USHRT_MAX
42
43/* Search max. number of dirty segments to select a victim segment */
44#define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
45
46#define NR_GC_CHECKPOINT_SECS (3) /* data/node/dentry sections */
47
48struct f2fs_gc_kthread {
49 struct task_struct *f2fs_gc_task;
50 wait_queue_head_t gc_wait_queue_head;
51
52 /* for gc sleep time */
53 unsigned int urgent_sleep_time;
54 unsigned int min_sleep_time;
55 unsigned int max_sleep_time;
56 unsigned int no_gc_sleep_time;
57
58 /* for changing gc mode */
59 bool gc_wake;
60
61 /* for GC_MERGE mount option */
62 wait_queue_head_t fggc_wq; /*
63 * caller of f2fs_balance_fs()
64 * will wait on this wait queue.
65 */
66
67 /* for gc control for zoned devices */
68 unsigned int no_zoned_gc_percent;
69 unsigned int boost_zoned_gc_percent;
70 unsigned int valid_thresh_ratio;
71};
72
73struct gc_inode_list {
74 struct list_head ilist;
75 struct radix_tree_root iroot;
76};
77
78struct victim_entry {
79 struct rb_node rb_node; /* rb node located in rb-tree */
80 unsigned long long mtime; /* mtime of section */
81 unsigned int segno; /* segment No. */
82 struct list_head list;
83};
84
85/*
86 * inline functions
87 */
88
89/*
90 * On a Zoned device zone-capacity can be less than zone-size and if
91 * zone-capacity is not aligned to f2fs segment size(2MB), then the segment
92 * starting just before zone-capacity has some blocks spanning across the
93 * zone-capacity, these blocks are not usable.
94 * Such spanning segments can be in free list so calculate the sum of usable
95 * blocks in currently free segments including normal and spanning segments.
96 */
97static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi)
98{
99 block_t free_seg_blks = 0;
100 struct free_segmap_info *free_i = FREE_I(sbi);
101 int j;
102
103 spin_lock(&free_i->segmap_lock);
104 for (j = 0; j < MAIN_SEGS(sbi); j++)
105 if (!test_bit(j, free_i->free_segmap))
106 free_seg_blks += f2fs_usable_blks_in_seg(sbi, j);
107 spin_unlock(&free_i->segmap_lock);
108
109 return free_seg_blks;
110}
111
112static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi)
113{
114 if (f2fs_sb_has_blkzoned(sbi))
115 return free_segs_blk_count_zoned(sbi);
116
117 return SEGS_TO_BLKS(sbi, free_segments(sbi));
118}
119
120static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
121{
122 block_t free_blks, ovp_blks;
123
124 free_blks = free_segs_blk_count(sbi);
125 ovp_blks = SEGS_TO_BLKS(sbi, overprovision_segments(sbi));
126
127 if (free_blks < ovp_blks)
128 return 0;
129
130 return free_blks - ovp_blks;
131}
132
133static inline block_t limit_invalid_user_blocks(block_t user_block_count)
134{
135 return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100;
136}
137
138static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks)
139{
140 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
141}
142
143static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
144 unsigned int *wait)
145{
146 unsigned int min_time = gc_th->min_sleep_time;
147 unsigned int max_time = gc_th->max_sleep_time;
148
149 if (*wait == gc_th->no_gc_sleep_time)
150 return;
151
152 if ((long long)*wait + (long long)min_time > (long long)max_time)
153 *wait = max_time;
154 else
155 *wait += min_time;
156}
157
158static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
159 unsigned int *wait)
160{
161 unsigned int min_time = gc_th->min_sleep_time;
162
163 if (*wait == gc_th->no_gc_sleep_time)
164 *wait = gc_th->max_sleep_time;
165
166 if ((long long)*wait - (long long)min_time < (long long)min_time)
167 *wait = min_time;
168 else
169 *wait -= min_time;
170}
171
172static inline bool has_enough_free_blocks(struct f2fs_sb_info *sbi,
173 unsigned int limit_perc)
174{
175 return free_sections(sbi) > ((sbi->total_sections * limit_perc) / 100);
176}
177
178static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
179{
180 block_t user_block_count = sbi->user_block_count;
181 block_t invalid_user_blocks = user_block_count -
182 written_block_count(sbi);
183 /*
184 * Background GC is triggered with the following conditions.
185 * 1. There are a number of invalid blocks.
186 * 2. There is not enough free space.
187 */
188 return (invalid_user_blocks >
189 limit_invalid_user_blocks(user_block_count) &&
190 free_user_blocks(sbi) <
191 limit_free_user_blocks(invalid_user_blocks));
192}
193
194static inline bool need_to_boost_gc(struct f2fs_sb_info *sbi)
195{
196 if (f2fs_sb_has_blkzoned(sbi))
197 return !has_enough_free_blocks(sbi, LIMIT_BOOST_ZONED_GC);
198 return has_enough_invalid_blocks(sbi);
199}