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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/* choose candidates from sections which has age of more than 7 days */
19#define DEF_GC_THREAD_AGE_THRESHOLD (60 * 60 * 24 * 7)
20#define DEF_GC_THREAD_CANDIDATE_RATIO 20 /* select 20% oldest sections as candidates */
21#define DEF_GC_THREAD_MAX_CANDIDATE_COUNT 10 /* select at most 10 sections as candidates */
22#define DEF_GC_THREAD_AGE_WEIGHT 60 /* age weight */
23#define DEFAULT_ACCURACY_CLASS 10000 /* accuracy class */
24
25#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
26#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
27
28#define DEF_GC_FAILED_PINNED_FILES 2048
29
30/* Search max. number of dirty segments to select a victim segment */
31#define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
32
33struct f2fs_gc_kthread {
34 struct task_struct *f2fs_gc_task;
35 wait_queue_head_t gc_wait_queue_head;
36
37 /* for gc sleep time */
38 unsigned int urgent_sleep_time;
39 unsigned int min_sleep_time;
40 unsigned int max_sleep_time;
41 unsigned int no_gc_sleep_time;
42
43 /* for changing gc mode */
44 unsigned int gc_wake;
45
46 /* for GC_MERGE mount option */
47 wait_queue_head_t fggc_wq; /*
48 * caller of f2fs_balance_fs()
49 * will wait on this wait queue.
50 */
51};
52
53struct gc_inode_list {
54 struct list_head ilist;
55 struct radix_tree_root iroot;
56};
57
58struct victim_info {
59 unsigned long long mtime; /* mtime of section */
60 unsigned int segno; /* section No. */
61};
62
63struct victim_entry {
64 struct rb_node rb_node; /* rb node located in rb-tree */
65 union {
66 struct {
67 unsigned long long mtime; /* mtime of section */
68 unsigned int segno; /* segment No. */
69 };
70 struct victim_info vi; /* victim info */
71 };
72 struct list_head list;
73};
74
75/*
76 * inline functions
77 */
78
79/*
80 * On a Zoned device zone-capacity can be less than zone-size and if
81 * zone-capacity is not aligned to f2fs segment size(2MB), then the segment
82 * starting just before zone-capacity has some blocks spanning across the
83 * zone-capacity, these blocks are not usable.
84 * Such spanning segments can be in free list so calculate the sum of usable
85 * blocks in currently free segments including normal and spanning segments.
86 */
87static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi)
88{
89 block_t free_seg_blks = 0;
90 struct free_segmap_info *free_i = FREE_I(sbi);
91 int j;
92
93 spin_lock(&free_i->segmap_lock);
94 for (j = 0; j < MAIN_SEGS(sbi); j++)
95 if (!test_bit(j, free_i->free_segmap))
96 free_seg_blks += f2fs_usable_blks_in_seg(sbi, j);
97 spin_unlock(&free_i->segmap_lock);
98
99 return free_seg_blks;
100}
101
102static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi)
103{
104 if (f2fs_sb_has_blkzoned(sbi))
105 return free_segs_blk_count_zoned(sbi);
106
107 return free_segments(sbi) << sbi->log_blocks_per_seg;
108}
109
110static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
111{
112 block_t free_blks, ovp_blks;
113
114 free_blks = free_segs_blk_count(sbi);
115 ovp_blks = overprovision_segments(sbi) << sbi->log_blocks_per_seg;
116
117 if (free_blks < ovp_blks)
118 return 0;
119
120 return free_blks - ovp_blks;
121}
122
123static inline block_t limit_invalid_user_blocks(block_t user_block_count)
124{
125 return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100;
126}
127
128static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks)
129{
130 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
131}
132
133static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
134 unsigned int *wait)
135{
136 unsigned int min_time = gc_th->min_sleep_time;
137 unsigned int max_time = gc_th->max_sleep_time;
138
139 if (*wait == gc_th->no_gc_sleep_time)
140 return;
141
142 if ((long long)*wait + (long long)min_time > (long long)max_time)
143 *wait = max_time;
144 else
145 *wait += min_time;
146}
147
148static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
149 unsigned int *wait)
150{
151 unsigned int min_time = gc_th->min_sleep_time;
152
153 if (*wait == gc_th->no_gc_sleep_time)
154 *wait = gc_th->max_sleep_time;
155
156 if ((long long)*wait - (long long)min_time < (long long)min_time)
157 *wait = min_time;
158 else
159 *wait -= min_time;
160}
161
162static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
163{
164 block_t user_block_count = sbi->user_block_count;
165 block_t invalid_user_blocks = user_block_count -
166 written_block_count(sbi);
167 /*
168 * Background GC is triggered with the following conditions.
169 * 1. There are a number of invalid blocks.
170 * 2. There is not enough free space.
171 */
172 return (invalid_user_blocks >
173 limit_invalid_user_blocks(user_block_count) &&
174 free_user_blocks(sbi) <
175 limit_free_user_blocks(invalid_user_blocks));
176}