172 lines
4.8 KiB
C
172 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* fs/f2fs/gc.h
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*/
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#define GC_THREAD_MIN_WB_PAGES 1 /*
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* a threshold to determine
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* whether IO subsystem is idle
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* or not
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*/
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#define DEF_GC_THREAD_URGENT_SLEEP_TIME 500 /* 500 ms */
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#define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
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#define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
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#define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
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/* choose candidates from sections which has age of more than 7 days */
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#define DEF_GC_THREAD_AGE_THRESHOLD (60 * 60 * 24 * 7)
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#define DEF_GC_THREAD_CANDIDATE_RATIO 20 /* select 20% oldest sections as candidates */
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#define DEF_GC_THREAD_MAX_CANDIDATE_COUNT 10 /* select at most 10 sections as candidates */
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#define DEF_GC_THREAD_AGE_WEIGHT 60 /* age weight */
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#define DEFAULT_ACCURACY_CLASS 10000 /* accuracy class */
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#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
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#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
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#define DEF_GC_FAILED_PINNED_FILES 2048
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/* Search max. number of dirty segments to select a victim segment */
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#define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
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struct f2fs_gc_kthread {
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struct task_struct *f2fs_gc_task;
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wait_queue_head_t gc_wait_queue_head;
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/* for gc sleep time */
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unsigned int urgent_sleep_time;
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unsigned int min_sleep_time;
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unsigned int max_sleep_time;
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unsigned int no_gc_sleep_time;
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/* for changing gc mode */
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unsigned int gc_wake;
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};
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struct gc_inode_list {
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struct list_head ilist;
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struct radix_tree_root iroot;
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};
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struct victim_info {
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unsigned long long mtime; /* mtime of section */
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unsigned int segno; /* section No. */
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};
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struct victim_entry {
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struct rb_node rb_node; /* rb node located in rb-tree */
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union {
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struct {
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unsigned long long mtime; /* mtime of section */
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unsigned int segno; /* segment No. */
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};
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struct victim_info vi; /* victim info */
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};
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struct list_head list;
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};
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/*
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* inline functions
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*/
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/*
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* On a Zoned device zone-capacity can be less than zone-size and if
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* zone-capacity is not aligned to f2fs segment size(2MB), then the segment
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* starting just before zone-capacity has some blocks spanning across the
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* zone-capacity, these blocks are not usable.
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* Such spanning segments can be in free list so calculate the sum of usable
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* blocks in currently free segments including normal and spanning segments.
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*/
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static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi)
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{
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block_t free_seg_blks = 0;
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struct free_segmap_info *free_i = FREE_I(sbi);
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int j;
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spin_lock(&free_i->segmap_lock);
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for (j = 0; j < MAIN_SEGS(sbi); j++)
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if (!test_bit(j, free_i->free_segmap))
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free_seg_blks += f2fs_usable_blks_in_seg(sbi, j);
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spin_unlock(&free_i->segmap_lock);
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return free_seg_blks;
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}
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static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi)
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{
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if (f2fs_sb_has_blkzoned(sbi))
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return free_segs_blk_count_zoned(sbi);
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return free_segments(sbi) << sbi->log_blocks_per_seg;
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}
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static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
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{
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block_t free_blks, ovp_blks;
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free_blks = free_segs_blk_count(sbi);
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ovp_blks = overprovision_segments(sbi) << sbi->log_blocks_per_seg;
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if (free_blks < ovp_blks)
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return 0;
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return free_blks - ovp_blks;
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}
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static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
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{
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return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
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}
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static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
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{
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block_t reclaimable_user_blocks = sbi->user_block_count -
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written_block_count(sbi);
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return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
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}
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static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
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unsigned int *wait)
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{
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unsigned int min_time = gc_th->min_sleep_time;
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unsigned int max_time = gc_th->max_sleep_time;
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if (*wait == gc_th->no_gc_sleep_time)
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return;
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if ((long long)*wait + (long long)min_time > (long long)max_time)
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*wait = max_time;
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else
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*wait += min_time;
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}
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static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
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unsigned int *wait)
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{
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unsigned int min_time = gc_th->min_sleep_time;
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if (*wait == gc_th->no_gc_sleep_time)
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*wait = gc_th->max_sleep_time;
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if ((long long)*wait - (long long)min_time < (long long)min_time)
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*wait = min_time;
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else
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*wait -= min_time;
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}
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static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
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{
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block_t invalid_user_blocks = sbi->user_block_count -
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written_block_count(sbi);
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/*
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* Background GC is triggered with the following conditions.
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* 1. There are a number of invalid blocks.
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* 2. There is not enough free space.
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*/
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if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
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free_user_blocks(sbi) < limit_free_user_blocks(sbi))
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return true;
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return false;
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}
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