Release 4.10 fs/f2fs/gc.c

/*
 * fs/f2fs/gc.c
 *
 * 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.
 */
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/f2fs_fs.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/freezer.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "gc.h"
#include <trace/events/f2fs.h>



static int gc_thread_func(void *data)
{
	struct f2fs_sb_info *sbi = data;
	struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
	wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
	long wait_ms;

	wait_ms = gc_th->min_sleep_time;

	do {
		if (try_to_freeze())
			continue;
		else
			wait_event_interruptible_timeout(*wq,
						kthread_should_stop(),
						msecs_to_jiffies(wait_ms));
		if (kthread_should_stop())
			break;

		if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
			increase_sleep_time(gc_th, &wait_ms);
			continue;
		}

#ifdef CONFIG_F2FS_FAULT_INJECTION
		if (time_to_inject(sbi, FAULT_CHECKPOINT))
			f2fs_stop_checkpoint(sbi, false);
#endif

		/*
                 * [GC triggering condition]
                 * 0. GC is not conducted currently.
                 * 1. There are enough dirty segments.
                 * 2. IO subsystem is idle by checking the # of writeback pages.
                 * 3. IO subsystem is idle by checking the # of requests in
                 *    bdev's request list.
                 *
                 * Note) We have to avoid triggering GCs frequently.
                 * Because it is possible that some segments can be
                 * invalidated soon after by user update or deletion.
                 * So, I'd like to wait some time to collect dirty segments.
                 */
		if (!mutex_trylock(&sbi->gc_mutex))
			continue;

		if (!is_idle(sbi)) {
			increase_sleep_time(gc_th, &wait_ms);
			mutex_unlock(&sbi->gc_mutex);
			continue;
		}

		if (has_enough_invalid_blocks(sbi))
			decrease_sleep_time(gc_th, &wait_ms);
		else
			increase_sleep_time(gc_th, &wait_ms);

		stat_inc_bggc_count(sbi);

		/* if return value is not zero, no victim was selected */
		if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC), true))
			wait_ms = gc_th->no_gc_sleep_time;

		trace_f2fs_background_gc(sbi->sb, wait_ms,
				prefree_segments(sbi), free_segments(sbi));

		/* balancing f2fs's metadata periodically */
		f2fs_balance_fs_bg(sbi);

	} while (!kthread_should_stop());
	return 0;
}

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namjae jeon
27
10.93%
1
7.14%
chao yu
chao yu
26
10.53%
3
21.43%
changman lee
changman lee
16
6.48%
1
7.14%
arter 97
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1
0.40%
1
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int start_gc_thread(struct f2fs_sb_info *sbi)
{
	struct f2fs_gc_kthread *gc_th;
	dev_t dev = sbi->sb->s_bdev->bd_dev;
	int err = 0;

	gc_th = f2fs_kmalloc(sbi, sizeof(struct f2fs_gc_kthread), GFP_KERNEL);
	if (!gc_th) {
		err = -ENOMEM;
		goto out;
	}

	gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
	gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
	gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;

	gc_th->gc_idle = 0;

	sbi->gc_thread = gc_th;
	init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
	sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
			"f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
	if (IS_ERR(gc_th->f2fs_gc_task)) {
		err = PTR_ERR(gc_th->f2fs_gc_task);
		kfree(gc_th);
		sbi->gc_thread = NULL;
	}
out:
	return err;
}

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namjae jeon
77
47.53%
5
62.50%
chao yu
chao yu
2
1.23%
1
12.50%
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void stop_gc_thread(struct f2fs_sb_info *sbi)
{
	struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
	if (!gc_th)
		return;
	kthread_stop(gc_th->f2fs_gc_task);
	kfree(gc_th);
	sbi->gc_thread = NULL;
}

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static int select_gc_type(struct f2fs_gc_kthread *gc_th, int gc_type)
{
	int gc_mode = (gc_type == BG_GC) ? GC_CB : GC_GREEDY;

	if (gc_th && gc_th->gc_idle) {
		if (gc_th->gc_idle == 1)
			gc_mode = GC_CB;
		else if (gc_th->gc_idle == 2)
			gc_mode = GC_GREEDY;
	}
	return gc_mode;
}

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static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
			int type, struct victim_sel_policy *p)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);

	if (p->alloc_mode == SSR) {
		p->gc_mode = GC_GREEDY;
		p->dirty_segmap = dirty_i->dirty_segmap[type];
		p->max_search = dirty_i->nr_dirty[type];
		p->ofs_unit = 1;
	} else {
		p->gc_mode = select_gc_type(sbi->gc_thread, gc_type);
		p->dirty_segmap = dirty_i->dirty_segmap[DIRTY];
		p->max_search = dirty_i->nr_dirty[DIRTY];
		p->ofs_unit = sbi->segs_per_sec;
	}

	if (p->max_search > sbi->max_victim_search)
		p->max_search = sbi->max_victim_search;

	p->offset = sbi->last_victim[p->gc_mode];
}

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75.16%
3
60.00%
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jin xu
34
22.22%
1
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namjae jeon
namjae jeon
4
2.61%
1
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static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
				struct victim_sel_policy *p)
{
	/* SSR allocates in a segment unit */
	if (p->alloc_mode == SSR)
		return sbi->blocks_per_seg;
	if (p->gc_mode == GC_GREEDY)
		return sbi->blocks_per_seg * p->ofs_unit;
	else if (p->gc_mode == GC_CB)
		return UINT_MAX;
	else /* No other gc_mode */
		return 0;
}

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66.67%
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3.08%
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static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
	unsigned int secno;

	/*
         * If the gc_type is FG_GC, we can select victim segments
         * selected by background GC before.
         * Those segments guarantee they have small valid blocks.
         */
	for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
		if (sec_usage_check(sbi, secno))
			continue;
		clear_bit(secno, dirty_i->victim_secmap);
		return secno * sbi->segs_per_sec;
	}
	return NULL_SEGNO;
}

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chao yu
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6.06%
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static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
{
	struct sit_info *sit_i = SIT_I(sbi);
	unsigned int secno = GET_SECNO(sbi, segno);
	unsigned int start = secno * sbi->segs_per_sec;
	unsigned long long mtime = 0;
	unsigned int vblocks;
	unsigned char age = 0;
	unsigned char u;
	unsigned int i;

	for (i = 0; i < sbi->segs_per_sec; i++)
		mtime += get_seg_entry(sbi, start + i)->mtime;
	vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);

	mtime = div_u64(mtime, sbi->segs_per_sec);
	vblocks = div_u64(vblocks, sbi->segs_per_sec);

	u = (vblocks * 100) >> sbi->log_blocks_per_seg;

	/* Handle if the system time has changed by the user */
	if (mtime < sit_i->min_mtime)
		sit_i->min_mtime = mtime;
	if (mtime > sit_i->max_mtime)
		sit_i->max_mtime = mtime;
	if (sit_i->max_mtime != sit_i->min_mtime)
		age = 100 - div64_u64(100 * (mtime - sit_i->min_mtime),
				sit_i->max_mtime - sit_i->min_mtime);

	return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
}

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static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
			unsigned int segno, struct victim_sel_policy *p)
{
	if (p->alloc_mode == SSR)
		return get_seg_entry(sbi, segno)->ckpt_valid_blocks;

	/* alloc_mode == LFS */
	if (p->gc_mode == GC_GREEDY)
		return get_valid_blocks(sbi, segno, sbi->segs_per_sec);
	else
		return get_cb_cost(sbi, segno);
}

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static unsigned int count_bits(const unsigned long *addr,
				unsigned int offset, unsigned int len)
{
	unsigned int end = offset + len, sum = 0;

	while (offset < end) {
		if (test_bit(offset++, addr))
			++sum;
	}
	return sum;
}

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/*
 * This function is called from two paths.
 * One is garbage collection and the other is SSR segment selection.
 * When it is called during GC, it just gets a victim segment
 * and it does not remove it from dirty seglist.
 * When it is called from SSR segment selection, it finds a segment
 * which has minimum valid blocks and removes it from dirty seglist.
 */


static int get_victim_by_default(struct f2fs_sb_info *sbi,
		unsigned int *result, int gc_type, int type, char alloc_mode)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
	struct victim_sel_policy p;
	unsigned int secno, last_victim;
	unsigned int last_segment = MAIN_SEGS(sbi);
	unsigned int nsearched = 0;

	mutex_lock(&dirty_i->seglist_lock);

	p.alloc_mode = alloc_mode;
	select_policy(sbi, gc_type, type, &p);

	p.min_segno = NULL_SEGNO;
	p.min_cost = get_max_cost(sbi, &p);

	if (p.max_search == 0)
		goto out;

	last_victim = sbi->last_victim[p.gc_mode];
	if (p.alloc_mode == LFS && gc_type == FG_GC) {
		p.min_segno = check_bg_victims(sbi);
		if (p.min_segno != NULL_SEGNO)
			goto got_it;
	}

	while (1) {
		unsigned long cost;
		unsigned int segno;

		segno = find_next_bit(p.dirty_segmap, last_segment, p.offset);
		if (segno >= last_segment) {
			if (sbi->last_victim[p.gc_mode]) {
				last_segment = sbi->last_victim[p.gc_mode];
				sbi->last_victim[p.gc_mode] = 0;
				p.offset = 0;
				continue;
			}
			break;
		}

		p.offset = segno + p.ofs_unit;
		if (p.ofs_unit > 1) {
			p.offset -= segno % p.ofs_unit;
			nsearched += count_bits(p.dirty_segmap,
						p.offset - p.ofs_unit,
						p.ofs_unit);
		} else {
			nsearched++;
		}


		secno = GET_SECNO(sbi, segno);

		if (sec_usage_check(sbi, secno))
			goto next;
		if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
			goto next;

		cost = get_gc_cost(sbi, segno, &p);

		if (p.min_cost > cost) {
			p.min_segno = segno;
			p.min_cost = cost;
		}
next:
		if (nsearched >= p.max_search) {
			if (!sbi->last_victim[p.gc_mode] && segno <= last_victim)
				sbi->last_victim[p.gc_mode] = last_victim + 1;
			else
				sbi->last_victim[p.gc_mode] = segno + 1;
			break;
		}
	}
	if (p.min_segno != NULL_SEGNO) {
got_it:
		if (p.alloc_mode == LFS) {
			secno = GET_SECNO(sbi, p.min_segno);
			if (gc_type == FG_GC)
				sbi->cur_victim_sec = secno;
			else
				set_bit(secno, dirty_i->victim_secmap);
		}
		*result = (p.min_segno / p.ofs_unit) * p.ofs_unit;

		trace_f2fs_get_victim(sbi->sb, type, gc_type, &p,
				sbi->cur_victim_sec,
				prefree_segments(sbi), free_segments(sbi));
	}
out:
	mutex_unlock(&dirty_i->seglist_lock);

	return (p.min_segno == NULL_SEGNO) ? 0 : 1;
}

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jaegeuk kim
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3
27.27%
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chao yu
43
7.83%
3
27.27%
fan li
fan li
38
6.92%
1
9.09%
namjae jeon
namjae jeon
31
5.65%
2
18.18%
jin xu
jin xu
16
2.91%
2
18.18%
Total
549
100.00%
11
100.00%


static const struct victim_selection default_v_ops = {
	.get_victim = get_victim_by_default,
};



static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
{
	struct inode_entry *ie;

	ie = radix_tree_lookup(&gc_list->iroot, ino);
	if (ie)
		return ie->inode;
	return NULL;
}

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jaegeuk kim
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68.89%
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changman lee
14
31.11%
1
50.00%
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45
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2
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static void add_gc_inode(struct gc_inode_list *gc_list, struct inode *inode)
{
	struct inode_entry *new_ie;

	if (inode == find_gc_inode(gc_list, inode->i_ino)) {
		iput(inode);
		return;
	}
	new_ie = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
	new_ie->inode = inode;

	f2fs_radix_tree_insert(&gc_list->iroot, inode->i_ino, new_ie);
	list_add_tail(&new_ie->list, &gc_list->ilist);
}

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16.67%
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changman lee
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26.19%
1
16.67%
gu zheng
gu zheng
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7.14%
2
33.33%
chao yu
chao yu
2
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2
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static void put_gc_inode(struct gc_inode_list *gc_list)
{
	struct inode_entry *ie, *next_ie;
	list_for_each_entry_safe(ie, next_ie, &gc_list->ilist, list) {
		radix_tree_delete(&gc_list->iroot, ie->inode->i_ino);
		iput(ie->inode);
		list_del(&ie->list);
		kmem_cache_free(inode_entry_slab, ie);
	}
}

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changman lee
17
25.37%
1
33.33%
chao yu
chao yu
1
1.49%
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33.33%
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static int check_valid_map(struct f2fs_sb_info *sbi,
				unsigned int segno, int offset)
{
	struct sit_info *sit_i = SIT_I(sbi);
	struct seg_entry *sentry;
	int ret;

	mutex_lock(&sit_i->sentry_lock);
	sentry = get_seg_entry(sbi, segno);
	ret = f2fs_test_bit(offset, sentry->cur_valid_map);
	mutex_unlock(&sit_i->sentry_lock);
	return ret;
}

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/*
 * This function compares node address got in summary with that in NAT.
 * On validity, copy that node with cold status, otherwise (invalid node)
 * ignore that.
 */


static void gc_node_segment(struct f2fs_sb_info *sbi,
		struct f2fs_summary *sum, unsigned int segno, int gc_type)
{
	struct f2fs_summary *entry;
	block_t start_addr;
	int off;
	int phase = 0;

	start_addr = START_BLOCK(sbi, segno);

next_step:
	entry = sum;

	for (off = 0; off < sbi->blocks_per_seg; off++, entry++) {
		nid_t nid = le32_to_cpu(entry->nid);
		struct page *node_page;
		struct node_info ni;

		/* stop BG_GC if there is not enough free sections. */
		if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))
			return;

		if (check_valid_map(sbi, segno, off) == 0)
			continue;

		if (phase == 0) {
			ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), 1,
							META_NAT, true);
			continue;
		}

		if (phase == 1) {
			ra_node_page(sbi, nid);
			continue;
		}

		/* phase == 2 */
		node_page = get_node_page(sbi, nid);
		if (IS_ERR(node_page))
			continue;

		/* block may become invalid during get_node_page */
		if (check_valid_map(sbi, segno, off) == 0) {
			f2fs_put_page(node_page, 1);
			continue;
		}

		get_node_info(sbi, nid, &ni);
		if (ni.blk_addr != start_addr + off) {
			f2fs_put_page(node_page, 1);
			continue;
		}

		move_node_page(node_page, gc_type);
		stat_inc_node_blk_count(sbi, 1, gc_type);
	}

	if (++phase < 3)
		goto next_step;
}

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45.45%
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chao yu
42
15.97%
3
27.27%
huang ying
huang ying
24
9.13%
1
9.09%
changman lee
changman lee
2
0.76%
1
9.09%
jin xu
jin xu
1
0.38%
1
9.09%
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263
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100.00%

/*
 * Calculate start block index indicating the given node offset.
 * Be careful, caller should give this node offset only indicating direct node
 * blocks. If any node offsets, which point the other types of node blocks such
 * as indirect or double indirect node blocks, are given, it must be a caller's
 * bug.
 */


block_t start_bidx_of_node(unsigned int node_ofs, struct inode *inode)
{
	unsigned int indirect_blks = 2 * NIDS_PER_BLOCK + 4;
	unsigned int bidx;

	if (node_ofs == 0)
		return 0;

	if (node_ofs <= 2) {
		bidx = node_ofs - 1;
	} else if (node_ofs <= indirect_blks) {
		int dec = (node_ofs - 4) / (NIDS_PER_BLOCK + 1);
		bidx = node_ofs - 2 - dec;
	} else {
		int dec = (node_ofs - indirect_blks - 3) / (NIDS_PER_BLOCK + 1);
		bidx = node_ofs - 5 - dec;
	}
	return bidx * ADDRS_PER_BLOCK + ADDRS_PER_INODE(inode);
}

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2.48%
1
25.00%
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121
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4
100.00%



static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
		struct node_info *dni, block_t blkaddr, unsigned int *nofs)
{
	struct page *node_page;
	nid_t nid;
	unsigned int ofs_in_node;
	block_t source_blkaddr;

	nid = le32_to_cpu(sum->nid);
	ofs_in_node = le16_to_cpu(sum->ofs_in_node);

	node_page = get_node_page(sbi, nid);
	if (IS_ERR(node_page))
		return false;

	get_node_info(sbi, nid, dni);

	if (sum->version != dni->version) {
		f2fs_put_page(node_page, 1);
		return false;
	}

	*nofs = ofs_of_node(node_page);
	source_blkaddr = datablock_addr(node_page, ofs_in_node);
	f2fs_put_page(node_page, 1);

	if (source_blkaddr != blkaddr)
		return false;
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jaegeuk kim
jaegeuk kim
142
95.95%
1
50.00%
nicholas krause
nicholas krause
6
4.05%
1
50.00%
Total
148
100.00%
2
100.00%



static void move_encrypted_block(struct inode *inode, block_t bidx,
							unsigned int segno, int off)
{
	struct f2fs_io_info fio = {
		.sbi = F2FS_I_SB(inode),
		.type = DATA,
		.op = REQ_OP_READ,
		.op_flags = 0,
		.encrypted_page = NULL,
        };
	struct dnode_of_data dn;
	struct f2fs_summary sum;
	struct node_info ni;
	struct page *page;
	block_t newaddr;
	int err;

	/* do not read out */
	page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
	if (!page)
		return;

	if (!check_valid_map(F2FS_I_SB(inode), segno, off))
		goto out;

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
	if (err)
		goto out;

	if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
		ClearPageUptodate(page);
		goto put_out;
	}

	/*
         * don't cache encrypted data into meta inode until previous dirty
         * data were writebacked to avoid racing between GC and flush.
         */
	f2fs_wait_on_page_writeback(page, DATA, true);

	get_node_info(fio.sbi, dn.nid, &ni);
	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);

	/* read page */
	fio.page = page;
	fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;

	allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,
							&sum, CURSEG_COLD_DATA);

	fio.encrypted_page = pagecache_get_page(META_MAPPING(fio.sbi), newaddr,
					FGP_LOCK | FGP_CREAT, GFP_NOFS);
	if (!fio.encrypted_page) {
		err = -ENOMEM;
		goto recover_block;
	}

	err = f2fs_submit_page_bio(&fio);
	if (err)
		goto put_page_out;

	/* write page */
	lock_page(fio.encrypted_page);

	if (unlikely(fio.encrypted_page->mapping != META_MAPPING(fio.sbi))) {
		err = -EIO;
		goto put_page_out;
	}
	if (unlikely(!PageUptodate(fio.encrypted_page))) {
		err = -EIO;
		goto put_page_out;
	}

	set_page_dirty(fio.encrypted_page);
	f2fs_wait_on_page_writeback(fio.encrypted_page, DATA, true);
	if (clear_page_dirty_for_io(fio.encrypted_page))
		dec_page_count(fio.sbi, F2FS_DIRTY_META);

	set_page_writeback(fio.encrypted_page);

	/* allocate block address */
	f2fs_wait_on_page_writeback(dn