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 #define NR_GC_CHECKPOINT_SECS (3) /* data/node/dentry sections */ 34 35 struct f2fs_gc_kthread { 36 struct task_struct *f2fs_gc_task; 37 wait_queue_head_t gc_wait_queue_head; 38 39 /* for gc sleep time */ 40 unsigned int urgent_sleep_time; 41 unsigned int min_sleep_time; 42 unsigned int max_sleep_time; 43 unsigned int no_gc_sleep_time; 44 45 /* for changing gc mode */ 46 bool gc_wake; 47 48 /* for GC_MERGE mount option */ 49 wait_queue_head_t fggc_wq; /* 50 * caller of f2fs_balance_fs() 51 * will wait on this wait queue. 52 */ 53 }; 54 55 struct gc_inode_list { 56 struct list_head ilist; 57 struct radix_tree_root iroot; 58 }; 59 60 struct victim_entry { 61 struct rb_node rb_node; /* rb node located in rb-tree */ 62 unsigned long long mtime; /* mtime of section */ 63 unsigned int segno; /* segment No. */ 64 struct list_head list; 65 }; 66 67 /* 68 * inline functions 69 */ 70 71 /* 72 * On a Zoned device zone-capacity can be less than zone-size and if 73 * zone-capacity is not aligned to f2fs segment size(2MB), then the segment 74 * starting just before zone-capacity has some blocks spanning across the 75 * zone-capacity, these blocks are not usable. 76 * Such spanning segments can be in free list so calculate the sum of usable 77 * blocks in currently free segments including normal and spanning segments. 78 */ 79 static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi) 80 { 81 block_t free_seg_blks = 0; 82 struct free_segmap_info *free_i = FREE_I(sbi); 83 int j; 84 85 spin_lock(&free_i->segmap_lock); 86 for (j = 0; j < MAIN_SEGS(sbi); j++) 87 if (!test_bit(j, free_i->free_segmap)) 88 free_seg_blks += f2fs_usable_blks_in_seg(sbi, j); 89 spin_unlock(&free_i->segmap_lock); 90 91 return free_seg_blks; 92 } 93 94 static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi) 95 { 96 if (f2fs_sb_has_blkzoned(sbi)) 97 return free_segs_blk_count_zoned(sbi); 98 99 return free_segments(sbi) << sbi->log_blocks_per_seg; 100 } 101 102 static inline block_t free_user_blocks(struct f2fs_sb_info *sbi) 103 { 104 block_t free_blks, ovp_blks; 105 106 free_blks = free_segs_blk_count(sbi); 107 ovp_blks = overprovision_segments(sbi) << sbi->log_blocks_per_seg; 108 109 if (free_blks < ovp_blks) 110 return 0; 111 112 return free_blks - ovp_blks; 113 } 114 115 static inline block_t limit_invalid_user_blocks(block_t user_block_count) 116 { 117 return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100; 118 } 119 120 static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks) 121 { 122 return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; 123 } 124 125 static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th, 126 unsigned int *wait) 127 { 128 unsigned int min_time = gc_th->min_sleep_time; 129 unsigned int max_time = gc_th->max_sleep_time; 130 131 if (*wait == gc_th->no_gc_sleep_time) 132 return; 133 134 if ((long long)*wait + (long long)min_time > (long long)max_time) 135 *wait = max_time; 136 else 137 *wait += min_time; 138 } 139 140 static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th, 141 unsigned int *wait) 142 { 143 unsigned int min_time = gc_th->min_sleep_time; 144 145 if (*wait == gc_th->no_gc_sleep_time) 146 *wait = gc_th->max_sleep_time; 147 148 if ((long long)*wait - (long long)min_time < (long long)min_time) 149 *wait = min_time; 150 else 151 *wait -= min_time; 152 } 153 154 static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi) 155 { 156 block_t user_block_count = sbi->user_block_count; 157 block_t invalid_user_blocks = user_block_count - 158 written_block_count(sbi); 159 /* 160 * Background GC is triggered with the following conditions. 161 * 1. There are a number of invalid blocks. 162 * 2. There is not enough free space. 163 */ 164 return (invalid_user_blocks > 165 limit_invalid_user_blocks(user_block_count) && 166 free_user_blocks(sbi) < 167 limit_free_user_blocks(invalid_user_blocks)); 168 } 169