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7c1a000d | 1 | // SPDX-License-Identifier: GPL-2.0 |
2658e50d JK |
2 | /* |
3 | * f2fs shrinker support | |
4 | * the basic infra was copied from fs/ubifs/shrinker.c | |
5 | * | |
6 | * Copyright (c) 2015 Motorola Mobility | |
7 | * Copyright (c) 2015 Jaegeuk Kim <jaegeuk@kernel.org> | |
2658e50d JK |
8 | */ |
9 | #include <linux/fs.h> | |
10 | #include <linux/f2fs_fs.h> | |
11 | ||
12 | #include "f2fs.h" | |
ad4edb83 | 13 | #include "node.h" |
2658e50d JK |
14 | |
15 | static LIST_HEAD(f2fs_list); | |
16 | static DEFINE_SPINLOCK(f2fs_list_lock); | |
17 | static unsigned int shrinker_run_no; | |
18 | ||
1b38dc8e JK |
19 | static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi) |
20 | { | |
a95ba66a | 21 | return NM_I(sbi)->nat_cnt[RECLAIMABLE_NAT]; |
1b38dc8e JK |
22 | } |
23 | ||
31696580 CY |
24 | static unsigned long __count_free_nids(struct f2fs_sb_info *sbi) |
25 | { | |
9a4ffdf5 | 26 | long count = NM_I(sbi)->nid_cnt[FREE_NID] - MAX_FREE_NIDS; |
02110a4f CY |
27 | |
28 | return count > 0 ? count : 0; | |
31696580 CY |
29 | } |
30 | ||
e7547dac JK |
31 | static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi, |
32 | enum extent_type type) | |
554df79e | 33 | { |
e7547dac JK |
34 | struct extent_tree_info *eti = &sbi->extent_tree[type]; |
35 | ||
36 | return atomic_read(&eti->total_zombie_tree) + | |
37 | atomic_read(&eti->total_ext_node); | |
554df79e JK |
38 | } |
39 | ||
2658e50d JK |
40 | unsigned long f2fs_shrink_count(struct shrinker *shrink, |
41 | struct shrink_control *sc) | |
42 | { | |
43 | struct f2fs_sb_info *sbi; | |
44 | struct list_head *p; | |
45 | unsigned long count = 0; | |
46 | ||
47 | spin_lock(&f2fs_list_lock); | |
48 | p = f2fs_list.next; | |
49 | while (p != &f2fs_list) { | |
50 | sbi = list_entry(p, struct f2fs_sb_info, s_list); | |
51 | ||
52 | /* stop f2fs_put_super */ | |
53 | if (!mutex_trylock(&sbi->umount_mutex)) { | |
54 | p = p->next; | |
55 | continue; | |
56 | } | |
57 | spin_unlock(&f2fs_list_lock); | |
58 | ||
e7547dac JK |
59 | /* count read extent cache entries */ |
60 | count += __count_extent_cache(sbi, EX_READ); | |
554df79e | 61 | |
71644dff JK |
62 | /* count block age extent cache entries */ |
63 | count += __count_extent_cache(sbi, EX_BLOCK_AGE); | |
64 | ||
7a88ddb5 | 65 | /* count clean nat cache entries */ |
1b38dc8e | 66 | count += __count_nat_entries(sbi); |
2658e50d | 67 | |
31696580 CY |
68 | /* count free nids cache entries */ |
69 | count += __count_free_nids(sbi); | |
70 | ||
2658e50d JK |
71 | spin_lock(&f2fs_list_lock); |
72 | p = p->next; | |
73 | mutex_unlock(&sbi->umount_mutex); | |
74 | } | |
75 | spin_unlock(&f2fs_list_lock); | |
76 | return count; | |
77 | } | |
78 | ||
79 | unsigned long f2fs_shrink_scan(struct shrinker *shrink, | |
80 | struct shrink_control *sc) | |
81 | { | |
82 | unsigned long nr = sc->nr_to_scan; | |
83 | struct f2fs_sb_info *sbi; | |
84 | struct list_head *p; | |
85 | unsigned int run_no; | |
86 | unsigned long freed = 0; | |
87 | ||
88 | spin_lock(&f2fs_list_lock); | |
89 | do { | |
90 | run_no = ++shrinker_run_no; | |
91 | } while (run_no == 0); | |
92 | p = f2fs_list.next; | |
93 | while (p != &f2fs_list) { | |
94 | sbi = list_entry(p, struct f2fs_sb_info, s_list); | |
95 | ||
96 | if (sbi->shrinker_run_no == run_no) | |
97 | break; | |
98 | ||
99 | /* stop f2fs_put_super */ | |
100 | if (!mutex_trylock(&sbi->umount_mutex)) { | |
101 | p = p->next; | |
102 | continue; | |
103 | } | |
104 | spin_unlock(&f2fs_list_lock); | |
105 | ||
106 | sbi->shrinker_run_no = run_no; | |
107 | ||
71644dff JK |
108 | /* shrink extent cache entries */ |
109 | freed += f2fs_shrink_age_extent_tree(sbi, nr >> 2); | |
110 | ||
e7547dac | 111 | /* shrink read extent cache entries */ |
71644dff | 112 | freed += f2fs_shrink_read_extent_tree(sbi, nr >> 2); |
554df79e | 113 | |
1b38dc8e | 114 | /* shrink clean nat cache entries */ |
554df79e | 115 | if (freed < nr) |
4d57b86d | 116 | freed += f2fs_try_to_free_nats(sbi, nr - freed); |
2658e50d | 117 | |
31696580 CY |
118 | /* shrink free nids cache entries */ |
119 | if (freed < nr) | |
4d57b86d | 120 | freed += f2fs_try_to_free_nids(sbi, nr - freed); |
31696580 | 121 | |
2658e50d JK |
122 | spin_lock(&f2fs_list_lock); |
123 | p = p->next; | |
124 | list_move_tail(&sbi->s_list, &f2fs_list); | |
125 | mutex_unlock(&sbi->umount_mutex); | |
126 | if (freed >= nr) | |
127 | break; | |
128 | } | |
129 | spin_unlock(&f2fs_list_lock); | |
130 | return freed; | |
131 | } | |
132 | ||
133 | void f2fs_join_shrinker(struct f2fs_sb_info *sbi) | |
134 | { | |
135 | spin_lock(&f2fs_list_lock); | |
136 | list_add_tail(&sbi->s_list, &f2fs_list); | |
137 | spin_unlock(&f2fs_list_lock); | |
138 | } | |
139 | ||
140 | void f2fs_leave_shrinker(struct f2fs_sb_info *sbi) | |
141 | { | |
e7547dac | 142 | f2fs_shrink_read_extent_tree(sbi, __count_extent_cache(sbi, EX_READ)); |
71644dff JK |
143 | f2fs_shrink_age_extent_tree(sbi, |
144 | __count_extent_cache(sbi, EX_BLOCK_AGE)); | |
3e72f721 | 145 | |
2658e50d | 146 | spin_lock(&f2fs_list_lock); |
e4589fa5 | 147 | list_del_init(&sbi->s_list); |
2658e50d JK |
148 | spin_unlock(&f2fs_list_lock); |
149 | } |