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 39 #define DEF_GC_FAILED_PINNED_FILES 2048 40 #define MAX_GC_FAILED_PINNED_FILES USHRT_MAX 41 42 /* Search max. number of dirty segments to select a victim segment */ 43 #define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */ 44 45 #define NR_GC_CHECKPOINT_SECS (3) /* data/node/dentry sections */ 46 47 struct f2fs_gc_kthread { 48 struct task_struct *f2fs_gc_task; 49 wait_queue_head_t gc_wait_queue_head; 50 51 /* for gc sleep time */ 52 unsigned int urgent_sleep_time; 53 unsigned int min_sleep_time; 54 unsigned int max_sleep_time; 55 unsigned int no_gc_sleep_time; 56 57 /* for changing gc mode */ 58 bool gc_wake; 59 60 /* for GC_MERGE mount option */ 61 wait_queue_head_t fggc_wq; /* 62 * caller of f2fs_balance_fs() 63 * will wait on this wait queue. 64 */ 65 66 /* for gc control for zoned devices */ 67 unsigned int no_zoned_gc_percent; 68 unsigned int boost_zoned_gc_percent; 69 unsigned int valid_thresh_ratio; 70 }; 71 72 struct gc_inode_list { 73 struct list_head ilist; 74 struct radix_tree_root iroot; 75 }; 76 77 struct victim_entry { 78 struct rb_node rb_node; /* rb node located in rb-tree */ 79 unsigned long long mtime; /* mtime of section */ 80 unsigned int segno; /* segment No. */ 81 struct list_head list; 82 }; 83 84 /* 85 * inline functions 86 */ 87 88 /* 89 * On a Zoned device zone-capacity can be less than zone-size and if 90 * zone-capacity is not aligned to f2fs segment size(2MB), then the segment 91 * starting just before zone-capacity has some blocks spanning across the 92 * zone-capacity, these blocks are not usable. 93 * Such spanning segments can be in free list so calculate the sum of usable 94 * blocks in currently free segments including normal and spanning segments. 95 */ 96 static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi) 97 { 98 block_t free_seg_blks = 0; 99 struct free_segmap_info *free_i = FREE_I(sbi); 100 int j; 101 102 spin_lock(&free_i->segmap_lock); 103 for (j = 0; j < MAIN_SEGS(sbi); j++) 104 if (!test_bit(j, free_i->free_segmap)) 105 free_seg_blks += f2fs_usable_blks_in_seg(sbi, j); 106 spin_unlock(&free_i->segmap_lock); 107 108 return free_seg_blks; 109 } 110 111 static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi) 112 { 113 if (f2fs_sb_has_blkzoned(sbi)) 114 return free_segs_blk_count_zoned(sbi); 115 116 return SEGS_TO_BLKS(sbi, free_segments(sbi)); 117 } 118 119 static inline block_t free_user_blocks(struct f2fs_sb_info *sbi) 120 { 121 block_t free_blks, ovp_blks; 122 123 free_blks = free_segs_blk_count(sbi); 124 ovp_blks = SEGS_TO_BLKS(sbi, overprovision_segments(sbi)); 125 126 if (free_blks < ovp_blks) 127 return 0; 128 129 return free_blks - ovp_blks; 130 } 131 132 static inline block_t limit_invalid_user_blocks(block_t user_block_count) 133 { 134 return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100; 135 } 136 137 static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks) 138 { 139 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; 140 } 141 142 static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th, 143 unsigned int *wait) 144 { 145 unsigned int min_time = gc_th->min_sleep_time; 146 unsigned int max_time = gc_th->max_sleep_time; 147 148 if (*wait == gc_th->no_gc_sleep_time) 149 return; 150 151 if ((long long)*wait + (long long)min_time > (long long)max_time) 152 *wait = max_time; 153 else 154 *wait += min_time; 155 } 156 157 static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th, 158 unsigned int *wait) 159 { 160 unsigned int min_time = gc_th->min_sleep_time; 161 162 if (*wait == gc_th->no_gc_sleep_time) 163 *wait = gc_th->max_sleep_time; 164 165 if ((long long)*wait - (long long)min_time < (long long)min_time) 166 *wait = min_time; 167 else 168 *wait -= min_time; 169 } 170 171 static inline bool has_enough_free_blocks(struct f2fs_sb_info *sbi, 172 unsigned int limit_perc) 173 { 174 return free_sections(sbi) > ((sbi->total_sections * limit_perc) / 100); 175 } 176 177 static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi) 178 { 179 block_t user_block_count = sbi->user_block_count; 180 block_t invalid_user_blocks = user_block_count - 181 written_block_count(sbi); 182 /* 183 * Background GC is triggered with the following conditions. 184 * 1. There are a number of invalid blocks. 185 * 2. There is not enough free space. 186 */ 187 return (invalid_user_blocks > 188 limit_invalid_user_blocks(user_block_count) && 189 free_user_blocks(sbi) < 190 limit_free_user_blocks(invalid_user_blocks)); 191 } 192 193 static inline bool need_to_boost_gc(struct f2fs_sb_info *sbi) 194 { 195 if (f2fs_sb_has_blkzoned(sbi)) 196 return !has_enough_free_blocks(sbi, LIMIT_BOOST_ZONED_GC); 197 return has_enough_invalid_blocks(sbi); 198 } 199