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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/*
2 * fs/f2fs/gc.h
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#define GC_THREAD_MIN_WB_PAGES 1 /*
12 * a threshold to determine
13 * whether IO subsystem is idle
14 * or not
15 */
16#define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
17#define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
18#define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
19#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
20#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
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 min_sleep_time;
31 unsigned int max_sleep_time;
32 unsigned int no_gc_sleep_time;
33
34 /* for changing gc mode */
35 unsigned int gc_idle;
36};
37
38struct inode_entry {
39 struct list_head list;
40 struct inode *inode;
41};
42
43/*
44 * inline functions
45 */
46static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
47{
48 if (free_segments(sbi) < overprovision_segments(sbi))
49 return 0;
50 else
51 return (free_segments(sbi) - overprovision_segments(sbi))
52 << sbi->log_blocks_per_seg;
53}
54
55static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
56{
57 return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
58}
59
60static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
61{
62 block_t reclaimable_user_blocks = sbi->user_block_count -
63 written_block_count(sbi);
64 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
65}
66
67static inline long increase_sleep_time(struct f2fs_gc_kthread *gc_th, long wait)
68{
69 if (wait == gc_th->no_gc_sleep_time)
70 return wait;
71
72 wait += gc_th->min_sleep_time;
73 if (wait > gc_th->max_sleep_time)
74 wait = gc_th->max_sleep_time;
75 return wait;
76}
77
78static inline long decrease_sleep_time(struct f2fs_gc_kthread *gc_th, long wait)
79{
80 if (wait == gc_th->no_gc_sleep_time)
81 wait = gc_th->max_sleep_time;
82
83 wait -= gc_th->min_sleep_time;
84 if (wait <= gc_th->min_sleep_time)
85 wait = gc_th->min_sleep_time;
86 return wait;
87}
88
89static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
90{
91 block_t invalid_user_blocks = sbi->user_block_count -
92 written_block_count(sbi);
93 /*
94 * Background GC is triggered with the following condition.
95 * 1. There are a number of invalid blocks.
96 * 2. There is not enough free space.
97 */
98 if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
99 free_user_blocks(sbi) < limit_free_user_blocks(sbi))
100 return true;
101 return false;
102}
103
104static inline int is_idle(struct f2fs_sb_info *sbi)
105{
106 struct block_device *bdev = sbi->sb->s_bdev;
107 struct request_queue *q = bdev_get_queue(bdev);
108 struct request_list *rl = &q->root_rl;
109 return !(rl->count[BLK_RW_SYNC]) && !(rl->count[BLK_RW_ASYNC]);
110}