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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * fs/f2fs/gc.h
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- * http://www.samsung.com/
- */
- #define GC_THREAD_MIN_WB_PAGES 1 /*
- * a threshold to determine
- * whether IO subsystem is idle
- * or not
- */
- #define DEF_GC_THREAD_URGENT_SLEEP_TIME 500 /* 500 ms */
- #define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
- #define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
- #define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
- /* choose candidates from sections which has age of more than 7 days */
- #define DEF_GC_THREAD_AGE_THRESHOLD (60 * 60 * 24 * 7)
- #define DEF_GC_THREAD_CANDIDATE_RATIO 20 /* select 20% oldest sections as candidates */
- #define DEF_GC_THREAD_MAX_CANDIDATE_COUNT 10 /* select at most 10 sections as candidates */
- #define DEF_GC_THREAD_AGE_WEIGHT 60 /* age weight */
- #define DEFAULT_ACCURACY_CLASS 10000 /* accuracy class */
- #define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
- #define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
- #define DEF_GC_FAILED_PINNED_FILES 2048
- /* Search max. number of dirty segments to select a victim segment */
- #define DEF_MAX_VICTIM_SEARCH 4096 /* covers 8GB */
- #define NR_GC_CHECKPOINT_SECS (3) /* data/node/dentry sections */
- struct f2fs_gc_kthread {
- struct task_struct *f2fs_gc_task;
- wait_queue_head_t gc_wait_queue_head;
- /* for gc sleep time */
- unsigned int urgent_sleep_time;
- unsigned int min_sleep_time;
- unsigned int max_sleep_time;
- unsigned int no_gc_sleep_time;
- /* for changing gc mode */
- bool gc_wake;
- /* for GC_MERGE mount option */
- wait_queue_head_t fggc_wq; /*
- * caller of f2fs_balance_fs()
- * will wait on this wait queue.
- */
- };
- struct gc_inode_list {
- struct list_head ilist;
- struct radix_tree_root iroot;
- };
- struct victim_entry {
- struct rb_node rb_node; /* rb node located in rb-tree */
- unsigned long long mtime; /* mtime of section */
- unsigned int segno; /* segment No. */
- struct list_head list;
- };
- /*
- * inline functions
- */
- /*
- * On a Zoned device zone-capacity can be less than zone-size and if
- * zone-capacity is not aligned to f2fs segment size(2MB), then the segment
- * starting just before zone-capacity has some blocks spanning across the
- * zone-capacity, these blocks are not usable.
- * Such spanning segments can be in free list so calculate the sum of usable
- * blocks in currently free segments including normal and spanning segments.
- */
- static inline block_t free_segs_blk_count_zoned(struct f2fs_sb_info *sbi)
- {
- block_t free_seg_blks = 0;
- struct free_segmap_info *free_i = FREE_I(sbi);
- int j;
- spin_lock(&free_i->segmap_lock);
- for (j = 0; j < MAIN_SEGS(sbi); j++)
- if (!test_bit(j, free_i->free_segmap))
- free_seg_blks += f2fs_usable_blks_in_seg(sbi, j);
- spin_unlock(&free_i->segmap_lock);
- return free_seg_blks;
- }
- static inline block_t free_segs_blk_count(struct f2fs_sb_info *sbi)
- {
- if (f2fs_sb_has_blkzoned(sbi))
- return free_segs_blk_count_zoned(sbi);
- return free_segments(sbi) << sbi->log_blocks_per_seg;
- }
- static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
- {
- block_t free_blks, ovp_blks;
- free_blks = free_segs_blk_count(sbi);
- ovp_blks = overprovision_segments(sbi) << sbi->log_blocks_per_seg;
- if (free_blks < ovp_blks)
- return 0;
- return free_blks - ovp_blks;
- }
- static inline block_t limit_invalid_user_blocks(block_t user_block_count)
- {
- return (long)(user_block_count * LIMIT_INVALID_BLOCK) / 100;
- }
- static inline block_t limit_free_user_blocks(block_t reclaimable_user_blocks)
- {
- return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
- }
- static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
- unsigned int *wait)
- {
- unsigned int min_time = gc_th->min_sleep_time;
- unsigned int max_time = gc_th->max_sleep_time;
- if (*wait == gc_th->no_gc_sleep_time)
- return;
- if ((long long)*wait + (long long)min_time > (long long)max_time)
- *wait = max_time;
- else
- *wait += min_time;
- }
- static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
- unsigned int *wait)
- {
- unsigned int min_time = gc_th->min_sleep_time;
- if (*wait == gc_th->no_gc_sleep_time)
- *wait = gc_th->max_sleep_time;
- if ((long long)*wait - (long long)min_time < (long long)min_time)
- *wait = min_time;
- else
- *wait -= min_time;
- }
- static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi)
- {
- block_t user_block_count = sbi->user_block_count;
- block_t invalid_user_blocks = user_block_count -
- written_block_count(sbi);
- /*
- * Background GC is triggered with the following conditions.
- * 1. There are a number of invalid blocks.
- * 2. There is not enough free space.
- */
- return (invalid_user_blocks >
- limit_invalid_user_blocks(user_block_count) &&
- free_user_blocks(sbi) <
- limit_free_user_blocks(invalid_user_blocks));
- }
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