/* 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 */
|
#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 */
|
|
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;
|
};
|
|
struct gc_inode_list {
|
struct list_head ilist;
|
struct radix_tree_root iroot;
|
};
|
|
/*
|
* inline functions
|
*/
|
static inline block_t free_user_blocks(struct f2fs_sb_info *sbi)
|
{
|
if (free_segments(sbi) < overprovision_segments(sbi))
|
return 0;
|
else
|
return (free_segments(sbi) - overprovision_segments(sbi))
|
<< sbi->log_blocks_per_seg;
|
}
|
|
static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
|
{
|
return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
|
}
|
|
static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
|
{
|
block_t reclaimable_user_blocks = sbi->user_block_count -
|
written_block_count(sbi);
|
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 invalid_user_blocks = sbi->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.
|
*/
|
if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
|
free_user_blocks(sbi) < limit_free_user_blocks(sbi))
|
return true;
|
return false;
|
}
|
