segment.c 57.8 KB
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/*
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 * fs/f2fs/segment.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/f2fs_fs.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
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#include <linux/prefetch.h>
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#include <linux/kthread.h>
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#include <linux/vmalloc.h>
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#include <linux/swap.h>
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#include "f2fs.h"
#include "segment.h"
#include "node.h"
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#include <trace/events/f2fs.h>
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#define __reverse_ffz(x) __reverse_ffs(~(x))

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static struct kmem_cache *discard_entry_slab;
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static struct kmem_cache *sit_entry_set_slab;
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static struct kmem_cache *inmem_entry_slab;
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/*
 * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
 * MSB and LSB are reversed in a byte by f2fs_set_bit.
 */
static inline unsigned long __reverse_ffs(unsigned long word)
{
	int num = 0;

#if BITS_PER_LONG == 64
	if ((word & 0xffffffff) == 0) {
		num += 32;
		word >>= 32;
	}
#endif
	if ((word & 0xffff) == 0) {
		num += 16;
		word >>= 16;
	}
	if ((word & 0xff) == 0) {
		num += 8;
		word >>= 8;
	}
	if ((word & 0xf0) == 0)
		num += 4;
	else
		word >>= 4;
	if ((word & 0xc) == 0)
		num += 2;
	else
		word >>= 2;
	if ((word & 0x2) == 0)
		num += 1;
	return num;
}

/*
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 * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
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 * f2fs_set_bit makes MSB and LSB reversed in a byte.
 * Example:
 *                             LSB <--> MSB
 *   f2fs_set_bit(0, bitmap) => 0000 0001
 *   f2fs_set_bit(7, bitmap) => 1000 0000
 */
static unsigned long __find_rev_next_bit(const unsigned long *addr,
			unsigned long size, unsigned long offset)
{
	const unsigned long *p = addr + BIT_WORD(offset);
	unsigned long result = offset & ~(BITS_PER_LONG - 1);
	unsigned long tmp;
	unsigned long mask, submask;
	unsigned long quot, rest;

	if (offset >= size)
		return size;

	size -= result;
	offset %= BITS_PER_LONG;
	if (!offset)
		goto aligned;

	tmp = *(p++);
	quot = (offset >> 3) << 3;
	rest = offset & 0x7;
	mask = ~0UL << quot;
	submask = (unsigned char)(0xff << rest) >> rest;
	submask <<= quot;
	mask &= submask;
	tmp &= mask;
	if (size < BITS_PER_LONG)
		goto found_first;
	if (tmp)
		goto found_middle;

	size -= BITS_PER_LONG;
	result += BITS_PER_LONG;
aligned:
	while (size & ~(BITS_PER_LONG-1)) {
		tmp = *(p++);
		if (tmp)
			goto found_middle;
		result += BITS_PER_LONG;
		size -= BITS_PER_LONG;
	}
	if (!size)
		return result;
	tmp = *p;
found_first:
	tmp &= (~0UL >> (BITS_PER_LONG - size));
	if (tmp == 0UL)		/* Are any bits set? */
		return result + size;   /* Nope. */
found_middle:
	return result + __reverse_ffs(tmp);
}

static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
			unsigned long size, unsigned long offset)
{
	const unsigned long *p = addr + BIT_WORD(offset);
	unsigned long result = offset & ~(BITS_PER_LONG - 1);
	unsigned long tmp;
	unsigned long mask, submask;
	unsigned long quot, rest;

	if (offset >= size)
		return size;

	size -= result;
	offset %= BITS_PER_LONG;
	if (!offset)
		goto aligned;

	tmp = *(p++);
	quot = (offset >> 3) << 3;
	rest = offset & 0x7;
	mask = ~(~0UL << quot);
	submask = (unsigned char)~((unsigned char)(0xff << rest) >> rest);
	submask <<= quot;
	mask += submask;
	tmp |= mask;
	if (size < BITS_PER_LONG)
		goto found_first;
	if (~tmp)
		goto found_middle;

	size -= BITS_PER_LONG;
	result += BITS_PER_LONG;
aligned:
	while (size & ~(BITS_PER_LONG - 1)) {
		tmp = *(p++);
		if (~tmp)
			goto found_middle;
		result += BITS_PER_LONG;
		size -= BITS_PER_LONG;
	}
	if (!size)
		return result;
	tmp = *p;

found_first:
	tmp |= ~0UL << size;
	if (tmp == ~0UL)        /* Are any bits zero? */
		return result + size;   /* Nope. */
found_middle:
	return result + __reverse_ffz(tmp);
}

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void register_inmem_page(struct inode *inode, struct page *page)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct inmem_pages *new;
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	int err;
retry:
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	new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);

	/* add atomic page indices to the list */
	new->page = page;
	INIT_LIST_HEAD(&new->list);

	/* increase reference count with clean state */
	mutex_lock(&fi->inmem_lock);
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	err = radix_tree_insert(&fi->inmem_root, page->index, new);
	if (err == -EEXIST) {
		mutex_unlock(&fi->inmem_lock);
		kmem_cache_free(inmem_entry_slab, new);
		return;
	} else if (err) {
		mutex_unlock(&fi->inmem_lock);
		kmem_cache_free(inmem_entry_slab, new);
		goto retry;
	}
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	get_page(page);
	list_add_tail(&new->list, &fi->inmem_pages);
	mutex_unlock(&fi->inmem_lock);
}

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void invalidate_inmem_page(struct inode *inode, struct page *page)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct inmem_pages *cur;

	mutex_lock(&fi->inmem_lock);
	cur = radix_tree_lookup(&fi->inmem_root, page->index);
	if (cur) {
		radix_tree_delete(&fi->inmem_root, cur->page->index);
		f2fs_put_page(cur->page, 0);
		list_del(&cur->list);
		kmem_cache_free(inmem_entry_slab, cur);
	}
	mutex_unlock(&fi->inmem_lock);
}

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void commit_inmem_pages(struct inode *inode, bool abort)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	struct inmem_pages *cur, *tmp;
	bool submit_bio = false;
	struct f2fs_io_info fio = {
		.type = DATA,
		.rw = WRITE_SYNC,
	};

	f2fs_balance_fs(sbi);
	f2fs_lock_op(sbi);

	mutex_lock(&fi->inmem_lock);
	list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
		lock_page(cur->page);
		if (!abort && cur->page->mapping == inode->i_mapping) {
			f2fs_wait_on_page_writeback(cur->page, DATA);
			if (clear_page_dirty_for_io(cur->page))
				inode_dec_dirty_pages(inode);
			do_write_data_page(cur->page, &fio);
			submit_bio = true;
		}
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		radix_tree_delete(&fi->inmem_root, cur->page->index);
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		f2fs_put_page(cur->page, 1);
		list_del(&cur->list);
		kmem_cache_free(inmem_entry_slab, cur);
	}
	if (submit_bio)
		f2fs_submit_merged_bio(sbi, DATA, WRITE);
	mutex_unlock(&fi->inmem_lock);

	filemap_fdatawait_range(inode->i_mapping, 0, LLONG_MAX);
	f2fs_unlock_op(sbi);
}

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/*
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 * This function balances dirty node and dentry pages.
 * In addition, it controls garbage collection.
 */
void f2fs_balance_fs(struct f2fs_sb_info *sbi)
{
	/*
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	 * We should do GC or end up with checkpoint, if there are so many dirty
	 * dir/node pages without enough free segments.
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	 */
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	if (has_not_enough_free_secs(sbi, 0)) {
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		mutex_lock(&sbi->gc_mutex);
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		f2fs_gc(sbi);
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	}
}

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void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
{
	/* check the # of cached NAT entries and prefree segments */
	if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
				excess_prefree_segs(sbi))
		f2fs_sync_fs(sbi->sb, true);
}

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static int issue_flush_thread(void *data)
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{
	struct f2fs_sb_info *sbi = data;
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	struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
	wait_queue_head_t *q = &fcc->flush_wait_queue;
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repeat:
	if (kthread_should_stop())
		return 0;

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	if (!llist_empty(&fcc->issue_list)) {
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		struct bio *bio = bio_alloc(GFP_NOIO, 0);
		struct flush_cmd *cmd, *next;
		int ret;

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		fcc->dispatch_list = llist_del_all(&fcc->issue_list);
		fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);

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		bio->bi_bdev = sbi->sb->s_bdev;
		ret = submit_bio_wait(WRITE_FLUSH, bio);

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		llist_for_each_entry_safe(cmd, next,
					  fcc->dispatch_list, llnode) {
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			cmd->ret = ret;
			complete(&cmd->wait);
		}
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		bio_put(bio);
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		fcc->dispatch_list = NULL;
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	}

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	wait_event_interruptible(*q,
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		kthread_should_stop() || !llist_empty(&fcc->issue_list));
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	goto repeat;
}

int f2fs_issue_flush(struct f2fs_sb_info *sbi)
{
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	struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
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	struct flush_cmd cmd;
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	trace_f2fs_issue_flush(sbi->sb, test_opt(sbi, NOBARRIER),
					test_opt(sbi, FLUSH_MERGE));

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	if (test_opt(sbi, NOBARRIER))
		return 0;

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	if (!test_opt(sbi, FLUSH_MERGE))
		return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);

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	init_completion(&cmd.wait);
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	llist_add(&cmd.llnode, &fcc->issue_list);
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	if (!fcc->dispatch_list)
		wake_up(&fcc->flush_wait_queue);
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	wait_for_completion(&cmd.wait);

	return cmd.ret;
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}

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int create_flush_cmd_control(struct f2fs_sb_info *sbi)
{
	dev_t dev = sbi->sb->s_bdev->bd_dev;
	struct flush_cmd_control *fcc;
	int err = 0;

	fcc = kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
	if (!fcc)
		return -ENOMEM;
	init_waitqueue_head(&fcc->flush_wait_queue);
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	init_llist_head(&fcc->issue_list);
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	SM_I(sbi)->cmd_control_info = fcc;
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	fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
				"f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
	if (IS_ERR(fcc->f2fs_issue_flush)) {
		err = PTR_ERR(fcc->f2fs_issue_flush);
		kfree(fcc);
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		SM_I(sbi)->cmd_control_info = NULL;
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		return err;
	}

	return err;
}

void destroy_flush_cmd_control(struct f2fs_sb_info *sbi)
{
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	struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
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	if (fcc && fcc->f2fs_issue_flush)
		kthread_stop(fcc->f2fs_issue_flush);
	kfree(fcc);
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	SM_I(sbi)->cmd_control_info = NULL;
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}

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static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
		enum dirty_type dirty_type)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);

	/* need not be added */
	if (IS_CURSEG(sbi, segno))
		return;

	if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
		dirty_i->nr_dirty[dirty_type]++;

	if (dirty_type == DIRTY) {
		struct seg_entry *sentry = get_seg_entry(sbi, segno);
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		enum dirty_type t = sentry->type;
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		if (unlikely(t >= DIRTY)) {
			f2fs_bug_on(sbi, 1);
			return;
		}
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		if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
			dirty_i->nr_dirty[t]++;
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	}
}

static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
		enum dirty_type dirty_type)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);

	if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
		dirty_i->nr_dirty[dirty_type]--;

	if (dirty_type == DIRTY) {
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		struct seg_entry *sentry = get_seg_entry(sbi, segno);
		enum dirty_type t = sentry->type;

		if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
			dirty_i->nr_dirty[t]--;
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		if (get_valid_blocks(sbi, segno, sbi->segs_per_sec) == 0)
			clear_bit(GET_SECNO(sbi, segno),
						dirty_i->victim_secmap);
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	}
}

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/*
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 * Should not occur error such as -ENOMEM.
 * Adding dirty entry into seglist is not critical operation.
 * If a given segment is one of current working segments, it won't be added.
 */
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static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
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{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
	unsigned short valid_blocks;

	if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
		return;

	mutex_lock(&dirty_i->seglist_lock);

	valid_blocks = get_valid_blocks(sbi, segno, 0);

	if (valid_blocks == 0) {
		__locate_dirty_segment(sbi, segno, PRE);
		__remove_dirty_segment(sbi, segno, DIRTY);
	} else if (valid_blocks < sbi->blocks_per_seg) {
		__locate_dirty_segment(sbi, segno, DIRTY);
	} else {
		/* Recovery routine with SSR needs this */
		__remove_dirty_segment(sbi, segno, DIRTY);
	}

	mutex_unlock(&dirty_i->seglist_lock);
}

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static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
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				block_t blkstart, block_t blklen)
{
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	sector_t start = SECTOR_FROM_BLOCK(blkstart);
	sector_t len = SECTOR_FROM_BLOCK(blklen);
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	trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
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	return blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
}

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void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
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{
	if (f2fs_issue_discard(sbi, blkaddr, 1)) {
		struct page *page = grab_meta_page(sbi, blkaddr);
		/* zero-filled page */
		set_page_dirty(page);
		f2fs_put_page(page, 1);
	}
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}

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static void __add_discard_entry(struct f2fs_sb_info *sbi,
		struct cp_control *cpc, unsigned int start, unsigned int end)
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{
	struct list_head *head = &SM_I(sbi)->discard_list;
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	struct discard_entry *new, *last;

	if (!list_empty(head)) {
		last = list_last_entry(head, struct discard_entry, list);
		if (START_BLOCK(sbi, cpc->trim_start) + start ==
						last->blkaddr + last->len) {
			last->len += end - start;
			goto done;
		}
	}

	new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
	INIT_LIST_HEAD(&new->list);
	new->blkaddr = START_BLOCK(sbi, cpc->trim_start) + start;
	new->len = end - start;
	list_add_tail(&new->list, head);
done:
	SM_I(sbi)->nr_discards += end - start;
	cpc->trimmed += end - start;
}

static void add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
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	int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
	int max_blocks = sbi->blocks_per_seg;
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	struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
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	unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
	unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
	unsigned long dmap[entries];
	unsigned int start = 0, end = -1;
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	bool force = (cpc->reason == CP_DISCARD);
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	int i;

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	if (!force && !test_opt(sbi, DISCARD))
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		return;

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	if (force && !se->valid_blocks) {
		struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
		/*
		 * if this segment is registered in the prefree list, then
		 * we should skip adding a discard candidate, and let the
		 * checkpoint do that later.
		 */
		mutex_lock(&dirty_i->seglist_lock);
		if (test_bit(cpc->trim_start, dirty_i->dirty_segmap[PRE])) {
			mutex_unlock(&dirty_i->seglist_lock);
			cpc->trimmed += sbi->blocks_per_seg;
			return;
		}
		mutex_unlock(&dirty_i->seglist_lock);

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		__add_discard_entry(sbi, cpc, 0, sbi->blocks_per_seg);
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		return;
	}

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	/* zero block will be discarded through the prefree list */
	if (!se->valid_blocks || se->valid_blocks == max_blocks)
		return;

	/* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
	for (i = 0; i < entries; i++)
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		dmap[i] = ~(cur_map[i] | ckpt_map[i]);
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	while (force || SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
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		start = __find_rev_next_bit(dmap, max_blocks, end + 1);
		if (start >= max_blocks)
			break;

		end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);

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		if (end - start < cpc->trim_minlen)
			continue;

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		__add_discard_entry(sbi, cpc, start, end);
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	}
}

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void release_discard_addrs(struct f2fs_sb_info *sbi)
{
	struct list_head *head = &(SM_I(sbi)->discard_list);
	struct discard_entry *entry, *this;

	/* drop caches */
	list_for_each_entry_safe(entry, this, head, list) {
		list_del(&entry->list);
		kmem_cache_free(discard_entry_slab, entry);
	}
}

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/*
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 * Should call clear_prefree_segments after checkpoint is done.
 */
static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
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	unsigned int segno;
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	mutex_lock(&dirty_i->seglist_lock);
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	for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
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		__set_test_and_free(sbi, segno);
	mutex_unlock(&dirty_i->seglist_lock);
}

void clear_prefree_segments(struct f2fs_sb_info *sbi)
{
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	struct list_head *head = &(SM_I(sbi)->discard_list);
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	struct discard_entry *entry, *this;
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	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
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	unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
	unsigned int start = 0, end = -1;
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	mutex_lock(&dirty_i->seglist_lock);
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	while (1) {
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		int i;
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		start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
		if (start >= MAIN_SEGS(sbi))
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			break;
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		end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
								start + 1);
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		for (i = start; i < end; i++)
			clear_bit(i, prefree_map);

		dirty_i->nr_dirty[PRE] -= end - start;

		if (!test_opt(sbi, DISCARD))
			continue;
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		f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
				(end - start) << sbi->log_blocks_per_seg);
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	}
	mutex_unlock(&dirty_i->seglist_lock);
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	/* send small discards */
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	list_for_each_entry_safe(entry, this, head, list) {
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		f2fs_issue_discard(sbi, entry->blkaddr, entry->len);
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		list_del(&entry->list);
		SM_I(sbi)->nr_discards -= entry->len;
		kmem_cache_free(discard_entry_slab, entry);
	}
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}

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static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
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{
	struct sit_info *sit_i = SIT_I(sbi);
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	if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap)) {
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		sit_i->dirty_sentries++;
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		return false;
	}

	return true;
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}

static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
					unsigned int segno, int modified)
{
	struct seg_entry *se = get_seg_entry(sbi, segno);
	se->type = type;
	if (modified)
		__mark_sit_entry_dirty(sbi, segno);
}

static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
{
	struct seg_entry *se;
	unsigned int segno, offset;
	long int new_vblocks;

	segno = GET_SEGNO(sbi, blkaddr);

	se = get_seg_entry(sbi, segno);
	new_vblocks = se->valid_blocks + del;
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	offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
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	f2fs_bug_on(sbi, (new_vblocks >> (sizeof(unsigned short) << 3) ||
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				(new_vblocks > sbi->blocks_per_seg)));

	se->valid_blocks = new_vblocks;
	se->mtime = get_mtime(sbi);
	SIT_I(sbi)->max_mtime = se->mtime;

	/* Update valid block bitmap */
	if (del > 0) {
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		if (f2fs_test_and_set_bit(offset, se->cur_valid_map))
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			f2fs_bug_on(sbi, 1);
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	} else {
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		if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map))
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			f2fs_bug_on(sbi, 1);
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	}
	if (!f2fs_test_bit(offset, se->ckpt_valid_map))
		se->ckpt_valid_blocks += del;

	__mark_sit_entry_dirty(sbi, segno);

	/* update total number of valid blocks to be written in ckpt area */
	SIT_I(sbi)->written_valid_blocks += del;

	if (sbi->segs_per_sec > 1)
		get_sec_entry(sbi, segno)->valid_blocks += del;
}

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void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new)
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{
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	update_sit_entry(sbi, new, 1);
	if (GET_SEGNO(sbi, old) != NULL_SEGNO)
		update_sit_entry(sbi, old, -1);

	locate_dirty_segment(sbi, GET_SEGNO(sbi, old));
	locate_dirty_segment(sbi, GET_SEGNO(sbi, new));
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}

void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
{
	unsigned int segno = GET_SEGNO(sbi, addr);
	struct sit_info *sit_i = SIT_I(sbi);

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	f2fs_bug_on(sbi, addr == NULL_ADDR);
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	if (addr == NEW_ADDR)
		return;

	/* add it into sit main buffer */
	mutex_lock(&sit_i->sentry_lock);

	update_sit_entry(sbi, addr, -1);

	/* add it into dirty seglist */
	locate_dirty_segment(sbi, segno);

	mutex_unlock(&sit_i->sentry_lock);
}

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/*
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 * This function should be resided under the curseg_mutex lock
 */
static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
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					struct f2fs_summary *sum)
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{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	void *addr = curseg->sum_blk;
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	addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
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	memcpy(addr, sum, sizeof(struct f2fs_summary));
}

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/*
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 * Calculate the number of current summary pages for writing
 */
int npages_for_summary_flush(struct f2fs_sb_info *sbi)
{
	int valid_sum_count = 0;
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	int i, sum_in_page;
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	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
		if (sbi->ckpt->alloc_type[i] == SSR)
			valid_sum_count += sbi->blocks_per_seg;
		else
			valid_sum_count += curseg_blkoff(sbi, i);
	}

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	sum_in_page = (PAGE_CACHE_SIZE - 2 * SUM_JOURNAL_SIZE -
			SUM_FOOTER_SIZE) / SUMMARY_SIZE;
	if (valid_sum_count <= sum_in_page)
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		return 1;
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	else if ((valid_sum_count - sum_in_page) <=
		(PAGE_CACHE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
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		return 2;
	return 3;
}

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/*
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 * Caller should put this summary page
 */
struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
{
	return get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
}

static void write_sum_page(struct f2fs_sb_info *sbi,
			struct f2fs_summary_block *sum_blk, block_t blk_addr)
{
	struct page *page = grab_meta_page(sbi, blk_addr);
	void *kaddr = page_address(page);
	memcpy(kaddr, sum_blk, PAGE_CACHE_SIZE);
	set_page_dirty(page);
	f2fs_put_page(page, 1);
}

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static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
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	unsigned int segno = curseg->segno + 1;
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	struct free_segmap_info *free_i = FREE_I(sbi);

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	if (segno < MAIN_SEGS(sbi) && segno % sbi->segs_per_sec)
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		return !test_bit(segno, free_i->free_segmap);
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	return 0;
}

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/*
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 * Find a new segment from the free segments bitmap to right order
 * This function should be returned with success, otherwise BUG
 */
static void get_new_segment(struct f2fs_sb_info *sbi,
			unsigned int *newseg, bool new_sec, int dir)
{
	struct free_segmap_info *free_i = FREE_I(sbi);
	unsigned int segno, secno, zoneno;
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	unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
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	unsigned int hint = *newseg / sbi->segs_per_sec;
	unsigned int old_zoneno = GET_ZONENO_FROM_SEGNO(sbi, *newseg);
	unsigned int left_start = hint;
	bool init = true;
	int go_left = 0;
	int i;

	write_lock(&free_i->segmap_lock);

	if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
		segno = find_next_zero_bit(free_i->free_segmap,
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					MAIN_SEGS(sbi), *newseg + 1);
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		if (segno - *newseg < sbi->segs_per_sec -
					(*newseg % sbi->segs_per_sec))
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			goto got_it;
	}
find_other_zone:
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	secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
	if (secno >= MAIN_SECS(sbi)) {
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		if (dir == ALLOC_RIGHT) {
			secno = find_next_zero_bit(free_i->free_secmap,
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							MAIN_SECS(sbi), 0);
			f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
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		} else {
			go_left = 1;
			left_start = hint - 1;
		}
	}
	if (go_left == 0)
		goto skip_left;

	while (test_bit(left_start, free_i->free_secmap)) {
		if (left_start > 0) {
			left_start--;
			continue;
		}
		left_start = find_next_zero_bit(free_i->free_secmap,
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							MAIN_SECS(sbi), 0);
		f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
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		break;
	}
	secno = left_start;
skip_left:
	hint = secno;
	segno = secno * sbi->segs_per_sec;
	zoneno = secno / sbi->secs_per_zone;

	/* give up on finding another zone */
	if (!init)
		goto got_it;
	if (sbi->secs_per_zone == 1)
		goto got_it;
	if (zoneno == old_zoneno)
		goto got_it;
	if (dir == ALLOC_LEFT) {
		if (!go_left && zoneno + 1 >= total_zones)
			goto got_it;
		if (go_left && zoneno == 0)
			goto got_it;
	}
	for (i = 0; i < NR_CURSEG_TYPE; i++)
		if (CURSEG_I(sbi, i)->zone == zoneno)
			break;

	if (i < NR_CURSEG_TYPE) {
		/* zone is in user, try another */
		if (go_left)
			hint = zoneno * sbi->secs_per_zone - 1;
		else if (zoneno + 1 >= total_zones)
			hint = 0;
		else
			hint = (zoneno + 1) * sbi->secs_per_zone;
		init = false;
		goto find_other_zone;
	}
got_it:
	/* set it as dirty segment in free segmap */
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	f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
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	__set_inuse(sbi, segno);
	*newseg = segno;
	write_unlock(&free_i->segmap_lock);
}

static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	struct summary_footer *sum_footer;

	curseg->segno = curseg->next_segno;
	curseg->zone = GET_ZONENO_FROM_SEGNO(sbi, curseg->segno);
	curseg->next_blkoff = 0;
	curseg->next_segno = NULL_SEGNO;

	sum_footer = &(curseg->sum_blk->footer);
	memset(sum_footer, 0, sizeof(struct summary_footer));
	if (IS_DATASEG(type))
		SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
	if (IS_NODESEG(type))
		SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
	__set_sit_entry_type(sbi, type, curseg->segno, modified);
}

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/*
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 * Allocate a current working segment.
 * This function always allocates a free segment in LFS manner.
 */
static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	unsigned int segno = curseg->segno;
	int dir = ALLOC_LEFT;

	write_sum_page(sbi, curseg->sum_blk,
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				GET_SUM_BLOCK(sbi, segno));
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	if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
		dir = ALLOC_RIGHT;

	if (test_opt(sbi, NOHEAP))
		dir = ALLOC_RIGHT;

	get_new_segment(sbi, &segno, new_sec, dir);
	curseg->next_segno = segno;
	reset_curseg(sbi, type, 1);
	curseg->alloc_type = LFS;
}

static void __next_free_blkoff(struct f2fs_sb_info *sbi,
			struct curseg_info *seg, block_t start)
{
	struct seg_entry *se = get_seg_entry(sbi, seg->segno);
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	int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
	unsigned long target_map[entries];
	unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
	unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
	int i, pos;

	for (i = 0; i < entries; i++)
		target_map[i] = ckpt_map[i] | cur_map[i];

	pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);

	seg->next_blkoff = pos;
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}

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/*
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 * If a segment is written by LFS manner, next block offset is just obtained
 * by increasing the current block offset. However, if a segment is written by
 * SSR manner, next block offset obtained by calling __next_free_blkoff
 */
static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
				struct curseg_info *seg)
{
	if (seg->alloc_type == SSR)
		__next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
	else
		seg->next_blkoff++;
}

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/*
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 * This function always allocates a used segment(from dirty seglist) by SSR
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 * manner, so it should recover the existing segment information of valid blocks
 */
static void change_curseg(struct f2fs_sb_info *sbi, int type, bool reuse)
{
	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	unsigned int new_segno = curseg->next_segno;
	struct f2fs_summary_block *sum_node;
	struct page *sum_page;

	write_sum_page(sbi, curseg->sum_blk,
				GET_SUM_BLOCK(sbi, curseg->segno));
	__set_test_and_inuse(sbi, new_segno);

	mutex_lock(&dirty_i->seglist_lock);
	__remove_dirty_segment(sbi, new_segno, PRE);
	__remove_dirty_segment(sbi, new_segno, DIRTY);
	mutex_unlock(&dirty_i->seglist_lock);

	reset_curseg(sbi, type, 1);
	curseg->alloc_type = SSR;
	__next_free_blkoff(sbi, curseg, 0);

	if (reuse) {
		sum_page = get_sum_page(sbi, new_segno);
		sum_node = (struct f2fs_summary_block *)page_address(sum_page);
		memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
		f2fs_put_page(sum_page, 1);
	}
}

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static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;

	if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0))
		return v_ops->get_victim(sbi,
				&(curseg)->next_segno, BG_GC, type, SSR);

	/* For data segments, let's do SSR more intensively */
	for (; type >= CURSEG_HOT_DATA; type--)
		if (v_ops->get_victim(sbi, &(curseg)->next_segno,
						BG_GC, type, SSR))
			return 1;
	return 0;
}

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/*
 * flush out current segment and replace it with new segment
 * This function should be returned with success, otherwise BUG
 */
static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
						int type, bool force)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);

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	if (force)
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		new_curseg(sbi, type, true);
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	else if (type == CURSEG_WARM_NODE)
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		new_curseg(sbi, type, false);
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	else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
		new_curseg(sbi, type, false);
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	else if (need_SSR(sbi) && get_ssr_segment(sbi, type))
		change_curseg(sbi, type, true);
	else
		new_curseg(sbi, type, false);
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	stat_inc_seg_type(sbi, curseg);
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}

void allocate_new_segments(struct f2fs_sb_info *sbi)
{
	struct curseg_info *curseg;
	unsigned int old_curseg;
	int i;

	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
		curseg = CURSEG_I(sbi, i);
		old_curseg = curseg->segno;
		SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
		locate_dirty_segment(sbi, old_curseg);
	}
}

static const struct segment_allocation default_salloc_ops = {
	.allocate_segment = allocate_segment_by_default,
};

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int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
{
	__u64 start = range->start >> sbi->log_blocksize;
	__u64 end = start + (range->len >> sbi->log_blocksize) - 1;
	unsigned int start_segno, end_segno;
	struct cp_control cpc;

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	if (range->minlen > SEGMENT_SIZE(sbi) || start >= MAX_BLKADDR(sbi) ||
						range->len < sbi->blocksize)
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		return -EINVAL;

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	cpc.trimmed = 0;
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	if (end <= MAIN_BLKADDR(sbi))
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		goto out;

	/* start/end segment number in main_area */
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	start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
	end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
						GET_SEGNO(sbi, end);
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	cpc.reason = CP_DISCARD;
	cpc.trim_start = start_segno;
	cpc.trim_end = end_segno;
	cpc.trim_minlen = range->minlen >> sbi->log_blocksize;

	/* do checkpoint to issue discard commands safely */
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	mutex_lock(&sbi->gc_mutex);
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	write_checkpoint(sbi, &cpc);
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	mutex_unlock(&sbi->gc_mutex);
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out:
	range->len = cpc.trimmed << sbi->log_blocksize;
	return 0;
}

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static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
{
	struct curseg_info *curseg = CURSEG_I(sbi, type);
	if (curseg->next_blkoff < sbi->blocks_per_seg)
		return true;
	return false;
}

static int __get_segment_type_2(struct page *page, enum page_type p_type)
{
	if (p_type == DATA)
		return CURSEG_HOT_DATA;
	else
		return CURSEG_HOT_NODE;
}

static int __get_segment_type_4(struct page *page, enum page_type p_type)
{
	if (p_type == DATA) {
		struct inode *inode = page->mapping->host;

		if (S_ISDIR(inode->i_mode))
			return CURSEG_HOT_DATA;
		else
			return CURSEG_COLD_DATA;
	} else {
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		if (IS_DNODE(page) && is_cold_node(page))
			return CURSEG_WARM_NODE;
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		else
			return CURSEG_COLD_NODE;
	}
}

static int __get_segment_type_6(struct page *page, enum page_type p_type)
{
	if (p_type == DATA) {
		struct inode *inode = page->mapping->host;

		if (S_ISDIR(inode->i_mode))
			return CURSEG_HOT_DATA;
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		else if (is_cold_data(page) || file_is_cold(inode))
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			return CURSEG_COLD_DATA;
		else
			return CURSEG_WARM_DATA;
	} else {
		if (IS_DNODE(page))
			return is_cold_node(page) ? CURSEG_WARM_NODE :
						CURSEG_HOT_NODE;
		else
			return CURSEG_COLD_NODE;
	}
}

static int __get_segment_type(struct page *page, enum page_type p_type)
{
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	switch (F2FS_P_SB(page)->active_logs) {
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	case 2:
		return __get_segment_type_2(page, p_type);
	case 4:
		return __get_segment_type_4(page, p_type);
	}
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	/* NR_CURSEG_TYPE(6) logs by default */
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	f2fs_bug_on(F2FS_P_SB(page),
		F2FS_P_SB(page)->active_logs != NR_CURSEG_TYPE);
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	return __get_segment_type_6(page, p_type);
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}

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void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
		block_t old_blkaddr, block_t *new_blkaddr,
		struct f2fs_summary *sum, int type)
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{
	struct sit_info *sit_i = SIT_I(sbi);
	struct curseg_info *curseg;

	curseg = CURSEG_I(sbi, type);

	mutex_lock(&curseg->curseg_mutex);

	*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);

	/*
	 * __add_sum_entry should be resided under the curseg_mutex
	 * because, this function updates a summary entry in the
	 * current summary block.
	 */
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	__add_sum_entry(sbi, type, sum);
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	mutex_lock(&sit_i->sentry_lock);
	__refresh_next_blkoff(sbi, curseg);
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	stat_inc_block_count(sbi, curseg);
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	if (!__has_curseg_space(sbi, type))
		sit_i->s_ops->allocate_segment(sbi, type, false);
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	/*
	 * SIT information should be updated before segment allocation,
	 * since SSR needs latest valid block information.
	 */
	refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
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	mutex_unlock(&sit_i->sentry_lock);

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	if (page && IS_NODESEG(type))
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		fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));

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	mutex_unlock(&curseg->curseg_mutex);
}

static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
			block_t old_blkaddr, block_t *new_blkaddr,
			struct f2fs_summary *sum, struct f2fs_io_info *fio)
{
	int type = __get_segment_type(page, fio->type);

	allocate_data_block(sbi, page, old_blkaddr, new_blkaddr, sum, type);

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	/* writeout dirty page into bdev */
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	f2fs_submit_page_mbio(sbi, page, *new_blkaddr, fio);
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}

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void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
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{
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	struct f2fs_io_info fio = {
		.type = META,
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		.rw = WRITE_SYNC | REQ_META | REQ_PRIO
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	};

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	set_page_writeback(page);
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	f2fs_submit_page_mbio(sbi, page, page->index, &fio);
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}

void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
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		struct f2fs_io_info *fio,
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		unsigned int nid, block_t old_blkaddr, block_t *new_blkaddr)
{
	struct f2fs_summary sum;
	set_summary(&sum, nid, 0, 0);