0a8165d7c2
As pointed out by Randy Dunlap, this patch removes all usage of "/**" for comment blocks. Instead, just use "/*". Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/*
|
|
* 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_NAME "f2fs_gc_task"
|
|
#define GC_THREAD_MIN_WB_PAGES 1 /*
|
|
* a threshold to determine
|
|
* whether IO subsystem is idle
|
|
* or not
|
|
*/
|
|
#define GC_THREAD_MIN_SLEEP_TIME 10000 /* milliseconds */
|
|
#define GC_THREAD_MAX_SLEEP_TIME 30000
|
|
#define GC_THREAD_NOGC_SLEEP_TIME 10000
|
|
#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 MAX_VICTIM_SEARCH 20
|
|
|
|
enum {
|
|
GC_NONE = 0,
|
|
GC_ERROR,
|
|
GC_OK,
|
|
GC_NEXT,
|
|
GC_BLOCKED,
|
|
GC_DONE,
|
|
};
|
|
|
|
struct f2fs_gc_kthread {
|
|
struct task_struct *f2fs_gc_task;
|
|
wait_queue_head_t gc_wait_queue_head;
|
|
};
|
|
|
|
struct inode_entry {
|
|
struct list_head list;
|
|
struct inode *inode;
|
|
};
|
|
|
|
/*
|
|
* 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 long increase_sleep_time(long wait)
|
|
{
|
|
wait += GC_THREAD_MIN_SLEEP_TIME;
|
|
if (wait > GC_THREAD_MAX_SLEEP_TIME)
|
|
wait = GC_THREAD_MAX_SLEEP_TIME;
|
|
return wait;
|
|
}
|
|
|
|
static inline long decrease_sleep_time(long wait)
|
|
{
|
|
wait -= GC_THREAD_MIN_SLEEP_TIME;
|
|
if (wait <= GC_THREAD_MIN_SLEEP_TIME)
|
|
wait = GC_THREAD_MIN_SLEEP_TIME;
|
|
return wait;
|
|
}
|
|
|
|
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 condition.
|
|
* 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;
|
|
}
|
|
|
|
static inline int is_idle(struct f2fs_sb_info *sbi)
|
|
{
|
|
struct block_device *bdev = sbi->sb->s_bdev;
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
struct request_list *rl = &q->root_rl;
|
|
return !(rl->count[BLK_RW_SYNC]) && !(rl->count[BLK_RW_ASYNC]);
|
|
}
|
|
|
|
static inline bool should_do_checkpoint(struct f2fs_sb_info *sbi)
|
|
{
|
|
unsigned int pages_per_sec = sbi->segs_per_sec *
|
|
(1 << sbi->log_blocks_per_seg);
|
|
int node_secs = ((get_pages(sbi, F2FS_DIRTY_NODES) + pages_per_sec - 1)
|
|
>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
|
|
int dent_secs = ((get_pages(sbi, F2FS_DIRTY_DENTS) + pages_per_sec - 1)
|
|
>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
|
|
return free_sections(sbi) <= (node_secs + 2 * dent_secs + 2);
|
|
}
|