Release 4.11 fs/f2fs/gc.h

/*
 * fs/f2fs/gc.h
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define GC_THREAD_MIN_WB_PAGES		1	
/*
                                                 * a threshold to determine
                                                 * whether IO subsystem is idle
                                                 * or not
                                                 */

#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 */

/* 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 min_sleep_time;
	
unsigned int max_sleep_time;
	
unsigned int no_gc_sleep_time;

	/* for changing gc mode */
	
unsigned int gc_idle;
};


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;
}

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static inline block_t limit_invalid_user_blocks(struct f2fs_sb_info *sbi)
{
	return (long)(sbi->user_block_count * LIMIT_INVALID_BLOCK) / 100;
}

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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;
}

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static inline void increase_sleep_time(struct f2fs_gc_kthread *gc_th,
								long *wait)
{
	if (*wait == gc_th->no_gc_sleep_time)
		return;

	*wait += gc_th->min_sleep_time;
	if (*wait > gc_th->max_sleep_time)
		*wait = gc_th->max_sleep_time;
}

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static inline void decrease_sleep_time(struct f2fs_gc_kthread *gc_th,
								long *wait)
{
	if (*wait == gc_th->no_gc_sleep_time)
		*wait = gc_th->max_sleep_time;

	*wait -= gc_th->min_sleep_time;
	if (*wait <= gc_th->min_sleep_time)
		*wait = gc_th->min_sleep_time;
}

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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;
}
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Directory: fs/f2fs

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