Commit | Line | Data |
---|---|---|
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 | ||
554df79e JK |
31 | static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi) |
32 | { | |
74fd8d99 | 33 | return atomic_read(&sbi->total_zombie_tree) + |
7441ccef | 34 | atomic_read(&sbi->total_ext_node); |
554df79e JK |
35 | } |
36 | ||
2658e50d JK |
37 | unsigned long f2fs_shrink_count(struct shrinker *shrink, |
38 | struct shrink_control *sc) | |
39 | { | |
40 | struct f2fs_sb_info *sbi; | |
41 | struct list_head *p; | |
42 | unsigned long count = 0; | |
43 | ||
44 | spin_lock(&f2fs_list_lock); | |
45 | p = f2fs_list.next; | |
46 | while (p != &f2fs_list) { | |
47 | sbi = list_entry(p, struct f2fs_sb_info, s_list); | |
48 | ||
49 | /* stop f2fs_put_super */ | |
50 | if (!mutex_trylock(&sbi->umount_mutex)) { | |
51 | p = p->next; | |
52 | continue; | |
53 | } | |
54 | spin_unlock(&f2fs_list_lock); | |
55 | ||
554df79e JK |
56 | /* count extent cache entries */ |
57 | count += __count_extent_cache(sbi); | |
58 | ||
7a88ddb5 | 59 | /* count clean nat cache entries */ |
1b38dc8e | 60 | count += __count_nat_entries(sbi); |
2658e50d | 61 | |
31696580 CY |
62 | /* count free nids cache entries */ |
63 | count += __count_free_nids(sbi); | |
64 | ||
2658e50d JK |
65 | spin_lock(&f2fs_list_lock); |
66 | p = p->next; | |
67 | mutex_unlock(&sbi->umount_mutex); | |
68 | } | |
69 | spin_unlock(&f2fs_list_lock); | |
70 | return count; | |
71 | } | |
72 | ||
73 | unsigned long f2fs_shrink_scan(struct shrinker *shrink, | |
74 | struct shrink_control *sc) | |
75 | { | |
76 | unsigned long nr = sc->nr_to_scan; | |
77 | struct f2fs_sb_info *sbi; | |
78 | struct list_head *p; | |
79 | unsigned int run_no; | |
80 | unsigned long freed = 0; | |
81 | ||
82 | spin_lock(&f2fs_list_lock); | |
83 | do { | |
84 | run_no = ++shrinker_run_no; | |
85 | } while (run_no == 0); | |
86 | p = f2fs_list.next; | |
87 | while (p != &f2fs_list) { | |
88 | sbi = list_entry(p, struct f2fs_sb_info, s_list); | |
89 | ||
90 | if (sbi->shrinker_run_no == run_no) | |
91 | break; | |
92 | ||
93 | /* stop f2fs_put_super */ | |
94 | if (!mutex_trylock(&sbi->umount_mutex)) { | |
95 | p = p->next; | |
96 | continue; | |
97 | } | |
98 | spin_unlock(&f2fs_list_lock); | |
99 | ||
100 | sbi->shrinker_run_no = run_no; | |
101 | ||
554df79e JK |
102 | /* shrink extent cache entries */ |
103 | freed += f2fs_shrink_extent_tree(sbi, nr >> 1); | |
104 | ||
1b38dc8e | 105 | /* shrink clean nat cache entries */ |
554df79e | 106 | if (freed < nr) |
4d57b86d | 107 | freed += f2fs_try_to_free_nats(sbi, nr - freed); |
2658e50d | 108 | |
31696580 CY |
109 | /* shrink free nids cache entries */ |
110 | if (freed < nr) | |
4d57b86d | 111 | freed += f2fs_try_to_free_nids(sbi, nr - freed); |
31696580 | 112 | |
2658e50d JK |
113 | spin_lock(&f2fs_list_lock); |
114 | p = p->next; | |
115 | list_move_tail(&sbi->s_list, &f2fs_list); | |
116 | mutex_unlock(&sbi->umount_mutex); | |
117 | if (freed >= nr) | |
118 | break; | |
119 | } | |
120 | spin_unlock(&f2fs_list_lock); | |
121 | return freed; | |
122 | } | |
123 | ||
124 | void f2fs_join_shrinker(struct f2fs_sb_info *sbi) | |
125 | { | |
126 | spin_lock(&f2fs_list_lock); | |
127 | list_add_tail(&sbi->s_list, &f2fs_list); | |
128 | spin_unlock(&f2fs_list_lock); | |
129 | } | |
130 | ||
131 | void f2fs_leave_shrinker(struct f2fs_sb_info *sbi) | |
132 | { | |
3e72f721 JK |
133 | f2fs_shrink_extent_tree(sbi, __count_extent_cache(sbi)); |
134 | ||
2658e50d | 135 | spin_lock(&f2fs_list_lock); |
e4589fa5 | 136 | list_del_init(&sbi->s_list); |
2658e50d JK |
137 | spin_unlock(&f2fs_list_lock); |
138 | } |