diff options
Diffstat (limited to 'fs/f2fs/gc.h')
| -rw-r--r-- | fs/f2fs/gc.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h new file mode 100644 index 000000000..47357101b --- /dev/null +++ b/fs/f2fs/gc.h @@ -0,0 +1,168 @@ +/* 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 */ + unsigned int 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)); +} |