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 33 struct 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 53 struct gc_inode_list { 54 struct list_head ilist; 55 struct radix_tree_root iroot; 56 }; 57 58 struct victim_info { 59 unsigned long long mtime; /* mtime of section */ 60 unsigned int segno; /* section No. */ 61 }; 62 63 struct 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 */ 87 static 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 } 101 102 static 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 } 109 110 static 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 } 122 123 static inline block_t limit_invalid_user_blocks(block_t user_block_count) 124 { 125 return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100; 126 } 127 128 static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks) 129 { 130 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; 131 } 132 133 static 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 } 147 148 static 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 } 161 162 static 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 } 177