node.c 52.8 KB
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/*
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 * fs/f2fs/node.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/mpage.h>
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/pagevec.h>
#include <linux/swap.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
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#include "trace.h"
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#include <trace/events/f2fs.h>
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#define on_build_free_nids(nmi) mutex_is_locked(&nm_i->build_lock)

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static struct kmem_cache *nat_entry_slab;
static struct kmem_cache *free_nid_slab;
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static struct kmem_cache *nat_entry_set_slab;
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bool available_free_memory(struct f2fs_sb_info *sbi, int type)
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{
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	struct f2fs_nm_info *nm_i = NM_I(sbi);
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	struct sysinfo val;
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	unsigned long avail_ram;
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	unsigned long mem_size = 0;
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	bool res = false;
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	si_meminfo(&val);
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	/* only uses low memory */
	avail_ram = val.totalram - val.totalhigh;

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	/*
	 * give 25%, 25%, 50%, 50%, 50% memory for each components respectively
	 */
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	if (type == FREE_NIDS) {
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		mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >>
							PAGE_CACHE_SHIFT;
		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
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	} else if (type == NAT_ENTRIES) {
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		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
							PAGE_CACHE_SHIFT;
		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
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	} else if (type == DIRTY_DENTS) {
		if (sbi->sb->s_bdi->wb.dirty_exceeded)
			return false;
		mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
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	} else if (type == INO_ENTRIES) {
		int i;

		for (i = 0; i <= UPDATE_INO; i++)
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			mem_size += (sbi->im[i].ino_num *
				sizeof(struct ino_entry)) >> PAGE_CACHE_SHIFT;
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		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
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	} else if (type == EXTENT_CACHE) {
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		mem_size = (atomic_read(&sbi->total_ext_tree) *
				sizeof(struct extent_tree) +
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				atomic_read(&sbi->total_ext_node) *
				sizeof(struct extent_node)) >> PAGE_CACHE_SHIFT;
		res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
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	} else {
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		if (!sbi->sb->s_bdi->wb.dirty_exceeded)
			return true;
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	}
	return res;
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}

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static void clear_node_page_dirty(struct page *page)
{
	struct address_space *mapping = page->mapping;
	unsigned int long flags;

	if (PageDirty(page)) {
		spin_lock_irqsave(&mapping->tree_lock, flags);
		radix_tree_tag_clear(&mapping->page_tree,
				page_index(page),
				PAGECACHE_TAG_DIRTY);
		spin_unlock_irqrestore(&mapping->tree_lock, flags);

		clear_page_dirty_for_io(page);
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		dec_page_count(F2FS_M_SB(mapping), F2FS_DIRTY_NODES);
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	}
	ClearPageUptodate(page);
}

static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
{
	pgoff_t index = current_nat_addr(sbi, nid);
	return get_meta_page(sbi, index);
}

static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
{
	struct page *src_page;
	struct page *dst_page;
	pgoff_t src_off;
	pgoff_t dst_off;
	void *src_addr;
	void *dst_addr;
	struct f2fs_nm_info *nm_i = NM_I(sbi);

	src_off = current_nat_addr(sbi, nid);
	dst_off = next_nat_addr(sbi, src_off);

	/* get current nat block page with lock */
	src_page = get_meta_page(sbi, src_off);
	dst_page = grab_meta_page(sbi, dst_off);
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	f2fs_bug_on(sbi, PageDirty(src_page));
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	src_addr = page_address(src_page);
	dst_addr = page_address(dst_page);
	memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
	set_page_dirty(dst_page);
	f2fs_put_page(src_page, 1);

	set_to_next_nat(nm_i, nid);

	return dst_page;
}

static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
{
	return radix_tree_lookup(&nm_i->nat_root, n);
}

static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
		nid_t start, unsigned int nr, struct nat_entry **ep)
{
	return radix_tree_gang_lookup(&nm_i->nat_root, (void **)ep, start, nr);
}

static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
{
	list_del(&e->list);
	radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
	nm_i->nat_cnt--;
	kmem_cache_free(nat_entry_slab, e);
}

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static void __set_nat_cache_dirty(struct f2fs_nm_info *nm_i,
						struct nat_entry *ne)
{
	nid_t set = NAT_BLOCK_OFFSET(ne->ni.nid);
	struct nat_entry_set *head;

	if (get_nat_flag(ne, IS_DIRTY))
		return;
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	head = radix_tree_lookup(&nm_i->nat_set_root, set);
	if (!head) {
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		head = f2fs_kmem_cache_alloc(nat_entry_set_slab, GFP_NOFS);
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		INIT_LIST_HEAD(&head->entry_list);
		INIT_LIST_HEAD(&head->set_list);
		head->set = set;
		head->entry_cnt = 0;
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		f2fs_radix_tree_insert(&nm_i->nat_set_root, set, head);
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	}
	list_move_tail(&ne->list, &head->entry_list);
	nm_i->dirty_nat_cnt++;
	head->entry_cnt++;
	set_nat_flag(ne, IS_DIRTY, true);
}

static void __clear_nat_cache_dirty(struct f2fs_nm_info *nm_i,
						struct nat_entry *ne)
{
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	nid_t set = NAT_BLOCK_OFFSET(ne->ni.nid);
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	struct nat_entry_set *head;

	head = radix_tree_lookup(&nm_i->nat_set_root, set);
	if (head) {
		list_move_tail(&ne->list, &nm_i->nat_entries);
		set_nat_flag(ne, IS_DIRTY, false);
		head->entry_cnt--;
		nm_i->dirty_nat_cnt--;
	}
}

static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
		nid_t start, unsigned int nr, struct nat_entry_set **ep)
{
	return radix_tree_gang_lookup(&nm_i->nat_set_root, (void **)ep,
							start, nr);
}

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int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
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{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct nat_entry *e;
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	bool need = false;
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	down_read(&nm_i->nat_tree_lock);
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	e = __lookup_nat_cache(nm_i, nid);
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	if (e) {
		if (!get_nat_flag(e, IS_CHECKPOINTED) &&
				!get_nat_flag(e, HAS_FSYNCED_INODE))
			need = true;
	}
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	up_read(&nm_i->nat_tree_lock);
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	return need;
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}

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bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
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{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct nat_entry *e;
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	bool is_cp = true;
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	down_read(&nm_i->nat_tree_lock);
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	e = __lookup_nat_cache(nm_i, nid);
	if (e && !get_nat_flag(e, IS_CHECKPOINTED))
		is_cp = false;
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	up_read(&nm_i->nat_tree_lock);
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	return is_cp;
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}

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bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
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{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct nat_entry *e;
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	bool need_update = true;
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	down_read(&nm_i->nat_tree_lock);
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	e = __lookup_nat_cache(nm_i, ino);
	if (e && get_nat_flag(e, HAS_LAST_FSYNC) &&
			(get_nat_flag(e, IS_CHECKPOINTED) ||
			 get_nat_flag(e, HAS_FSYNCED_INODE)))
		need_update = false;
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	up_read(&nm_i->nat_tree_lock);
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	return need_update;
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}

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static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
{
	struct nat_entry *new;

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	new = f2fs_kmem_cache_alloc(nat_entry_slab, GFP_NOFS);
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	f2fs_radix_tree_insert(&nm_i->nat_root, nid, new);
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	memset(new, 0, sizeof(struct nat_entry));
	nat_set_nid(new, nid);
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	nat_reset_flag(new);
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	list_add_tail(&new->list, &nm_i->nat_entries);
	nm_i->nat_cnt++;
	return new;
}

static void cache_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid,
						struct f2fs_nat_entry *ne)
{
	struct nat_entry *e;
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	e = __lookup_nat_cache(nm_i, nid);
	if (!e) {
		e = grab_nat_entry(nm_i, nid);
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		node_info_from_raw_nat(&e->ni, ne);
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	}
}

static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
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			block_t new_blkaddr, bool fsync_done)
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{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct nat_entry *e;
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	down_write(&nm_i->nat_tree_lock);
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	e = __lookup_nat_cache(nm_i, ni->nid);
	if (!e) {
		e = grab_nat_entry(nm_i, ni->nid);
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		copy_node_info(&e->ni, ni);
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		f2fs_bug_on(sbi, ni->blk_addr == NEW_ADDR);
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	} else if (new_blkaddr == NEW_ADDR) {
		/*
		 * when nid is reallocated,
		 * previous nat entry can be remained in nat cache.
		 * So, reinitialize it with new information.
		 */
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		copy_node_info(&e->ni, ni);
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		f2fs_bug_on(sbi, ni->blk_addr != NULL_ADDR);
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	}

	/* sanity check */
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	f2fs_bug_on(sbi, nat_get_blkaddr(e) != ni->blk_addr);
	f2fs_bug_on(sbi, nat_get_blkaddr(e) == NULL_ADDR &&
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			new_blkaddr == NULL_ADDR);
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	f2fs_bug_on(sbi, nat_get_blkaddr(e) == NEW_ADDR &&
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			new_blkaddr == NEW_ADDR);
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	f2fs_bug_on(sbi, nat_get_blkaddr(e) != NEW_ADDR &&
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			nat_get_blkaddr(e) != NULL_ADDR &&
			new_blkaddr == NEW_ADDR);

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	/* increment version no as node is removed */
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	if (nat_get_blkaddr(e) != NEW_ADDR && new_blkaddr == NULL_ADDR) {
		unsigned char version = nat_get_version(e);
		nat_set_version(e, inc_node_version(version));
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		/* in order to reuse the nid */
		if (nm_i->next_scan_nid > ni->nid)
			nm_i->next_scan_nid = ni->nid;
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	}

	/* change address */
	nat_set_blkaddr(e, new_blkaddr);
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	if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
		set_nat_flag(e, IS_CHECKPOINTED, false);
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	__set_nat_cache_dirty(nm_i, e);
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	/* update fsync_mark if its inode nat entry is still alive */
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	if (ni->nid != ni->ino)
		e = __lookup_nat_cache(nm_i, ni->ino);
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	if (e) {
		if (fsync_done && ni->nid == ni->ino)
			set_nat_flag(e, HAS_FSYNCED_INODE, true);
		set_nat_flag(e, HAS_LAST_FSYNC, fsync_done);
	}
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	up_write(&nm_i->nat_tree_lock);
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}

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int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
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{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
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	int nr = nr_shrink;
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	if (!down_write_trylock(&nm_i->nat_tree_lock))
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		return 0;

	while (nr_shrink && !list_empty(&nm_i->nat_entries)) {
		struct nat_entry *ne;
		ne = list_first_entry(&nm_i->nat_entries,
					struct nat_entry, list);
		__del_from_nat_cache(nm_i, ne);
		nr_shrink--;
	}
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	up_write(&nm_i->nat_tree_lock);
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	return nr - nr_shrink;
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}

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/*
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 * This function always returns success
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 */
void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
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	struct f2fs_journal *journal = curseg->journal;
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	nid_t start_nid = START_NID(nid);
	struct f2fs_nat_block *nat_blk;
	struct page *page = NULL;
	struct f2fs_nat_entry ne;
	struct nat_entry *e;
	int i;

	ni->nid = nid;

	/* Check nat cache */
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	down_read(&nm_i->nat_tree_lock);
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	e = __lookup_nat_cache(nm_i, nid);
	if (e) {
		ni->ino = nat_get_ino(e);
		ni->blk_addr = nat_get_blkaddr(e);
		ni->version = nat_get_version(e);
	}
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	up_read(&nm_i->nat_tree_lock);
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	if (e)
		return;

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	memset(&ne, 0, sizeof(struct f2fs_nat_entry));

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	down_write(&nm_i->nat_tree_lock);

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	/* Check current segment summary */
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	down_read(&curseg->journal_rwsem);
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	i = lookup_journal_in_cursum(journal, NAT_JOURNAL, nid, 0);
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	if (i >= 0) {
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		ne = nat_in_journal(journal, i);
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		node_info_from_raw_nat(ni, &ne);
	}
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	up_read(&curseg->journal_rwsem);
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	if (i >= 0)
		goto cache;

	/* Fill node_info from nat page */
	page = get_current_nat_page(sbi, start_nid);
	nat_blk = (struct f2fs_nat_block *)page_address(page);
	ne = nat_blk->entries[nid - start_nid];
	node_info_from_raw_nat(ni, &ne);
	f2fs_put_page(page, 1);
cache:
	/* cache nat entry */
	cache_nat_entry(NM_I(sbi), nid, &ne);
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	up_write(&nm_i->nat_tree_lock);
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}

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pgoff_t get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs)
{
	const long direct_index = ADDRS_PER_INODE(dn->inode);
	const long direct_blks = ADDRS_PER_BLOCK;
	const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
	unsigned int skipped_unit = ADDRS_PER_BLOCK;
	int cur_level = dn->cur_level;
	int max_level = dn->max_level;
	pgoff_t base = 0;

	if (!dn->max_level)
		return pgofs + 1;

	while (max_level-- > cur_level)
		skipped_unit *= NIDS_PER_BLOCK;

	switch (dn->max_level) {
	case 3:
		base += 2 * indirect_blks;
	case 2:
		base += 2 * direct_blks;
	case 1:
		base += direct_index;
		break;
	default:
		f2fs_bug_on(F2FS_I_SB(dn->inode), 1);
	}

	return ((pgofs - base) / skipped_unit + 1) * skipped_unit + base;
}

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/*
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 * The maximum depth is four.
 * Offset[0] will have raw inode offset.
 */
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static int get_node_path(struct inode *inode, long block,
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				int offset[4], unsigned int noffset[4])
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{
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	const long direct_index = ADDRS_PER_INODE(inode);
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	const long direct_blks = ADDRS_PER_BLOCK;
	const long dptrs_per_blk = NIDS_PER_BLOCK;
	const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
	const long dindirect_blks = indirect_blks * NIDS_PER_BLOCK;
	int n = 0;
	int level = 0;

	noffset[0] = 0;

	if (block < direct_index) {
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		offset[n] = block;
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		goto got;
	}
	block -= direct_index;
	if (block < direct_blks) {
		offset[n++] = NODE_DIR1_BLOCK;
		noffset[n] = 1;
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		offset[n] = block;
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		level = 1;
		goto got;
	}
	block -= direct_blks;
	if (block < direct_blks) {
		offset[n++] = NODE_DIR2_BLOCK;
		noffset[n] = 2;
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		offset[n] = block;
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		level = 1;
		goto got;
	}
	block -= direct_blks;
	if (block < indirect_blks) {
		offset[n++] = NODE_IND1_BLOCK;
		noffset[n] = 3;
		offset[n++] = block / direct_blks;
		noffset[n] = 4 + offset[n - 1];
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		offset[n] = block % direct_blks;
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		level = 2;
		goto got;
	}
	block -= indirect_blks;
	if (block < indirect_blks) {
		offset[n++] = NODE_IND2_BLOCK;
		noffset[n] = 4 + dptrs_per_blk;
		offset[n++] = block / direct_blks;
		noffset[n] = 5 + dptrs_per_blk + offset[n - 1];
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		offset[n] = block % direct_blks;
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		level = 2;
		goto got;
	}
	block -= indirect_blks;
	if (block < dindirect_blks) {
		offset[n++] = NODE_DIND_BLOCK;
		noffset[n] = 5 + (dptrs_per_blk * 2);
		offset[n++] = block / indirect_blks;
		noffset[n] = 6 + (dptrs_per_blk * 2) +
			      offset[n - 1] * (dptrs_per_blk + 1);
		offset[n++] = (block / direct_blks) % dptrs_per_blk;
		noffset[n] = 7 + (dptrs_per_blk * 2) +
			      offset[n - 2] * (dptrs_per_blk + 1) +
			      offset[n - 1];
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		offset[n] = block % direct_blks;
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		level = 3;
		goto got;
	} else {
		BUG();
	}
got:
	return level;
}

/*
 * Caller should call f2fs_put_dnode(dn).
C
Chao Yu 已提交
517 518
 * Also, it should grab and release a rwsem by calling f2fs_lock_op() and
 * f2fs_unlock_op() only if ro is not set RDONLY_NODE.
519
 * In the case of RDONLY_NODE, we don't need to care about mutex.
J
Jaegeuk Kim 已提交
520
 */
521
int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
J
Jaegeuk Kim 已提交
522
{
523
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
J
Jaegeuk Kim 已提交
524
	struct page *npage[4];
525
	struct page *parent = NULL;
J
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526 527 528
	int offset[4];
	unsigned int noffset[4];
	nid_t nids[4];
529
	int level, i = 0;
J
Jaegeuk Kim 已提交
530 531
	int err = 0;

532
	level = get_node_path(dn->inode, index, offset, noffset);
J
Jaegeuk Kim 已提交
533 534

	nids[0] = dn->inode->i_ino;
535
	npage[0] = dn->inode_page;
J
Jaegeuk Kim 已提交
536

537 538 539 540 541
	if (!npage[0]) {
		npage[0] = get_node_page(sbi, nids[0]);
		if (IS_ERR(npage[0]))
			return PTR_ERR(npage[0]);
	}
542 543 544

	/* if inline_data is set, should not report any block indices */
	if (f2fs_has_inline_data(dn->inode) && index) {
545
		err = -ENOENT;
546 547 548 549
		f2fs_put_page(npage[0], 1);
		goto release_out;
	}

J
Jaegeuk Kim 已提交
550
	parent = npage[0];
551 552
	if (level != 0)
		nids[1] = get_nid(parent, offset[0], true);
J
Jaegeuk Kim 已提交
553 554 555 556 557 558 559
	dn->inode_page = npage[0];
	dn->inode_page_locked = true;

	/* get indirect or direct nodes */
	for (i = 1; i <= level; i++) {
		bool done = false;

560
		if (!nids[i] && mode == ALLOC_NODE) {
J
Jaegeuk Kim 已提交
561 562 563 564 565 566 567
			/* alloc new node */
			if (!alloc_nid(sbi, &(nids[i]))) {
				err = -ENOSPC;
				goto release_pages;
			}

			dn->nid = nids[i];
568
			npage[i] = new_node_page(dn, noffset[i], NULL);
J
Jaegeuk Kim 已提交
569 570 571 572 573 574 575 576 577
			if (IS_ERR(npage[i])) {
				alloc_nid_failed(sbi, nids[i]);
				err = PTR_ERR(npage[i]);
				goto release_pages;
			}

			set_nid(parent, offset[i - 1], nids[i], i == 1);
			alloc_nid_done(sbi, nids[i]);
			done = true;
578
		} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
J
Jaegeuk Kim 已提交
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618
			npage[i] = get_node_page_ra(parent, offset[i - 1]);
			if (IS_ERR(npage[i])) {
				err = PTR_ERR(npage[i]);
				goto release_pages;
			}
			done = true;
		}
		if (i == 1) {
			dn->inode_page_locked = false;
			unlock_page(parent);
		} else {
			f2fs_put_page(parent, 1);
		}

		if (!done) {
			npage[i] = get_node_page(sbi, nids[i]);
			if (IS_ERR(npage[i])) {
				err = PTR_ERR(npage[i]);
				f2fs_put_page(npage[0], 0);
				goto release_out;
			}
		}
		if (i < level) {
			parent = npage[i];
			nids[i + 1] = get_nid(parent, offset[i], false);
		}
	}
	dn->nid = nids[level];
	dn->ofs_in_node = offset[level];
	dn->node_page = npage[level];
	dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
	return 0;

release_pages:
	f2fs_put_page(parent, 1);
	if (i > 1)
		f2fs_put_page(npage[0], 0);
release_out:
	dn->inode_page = NULL;
	dn->node_page = NULL;
619 620 621 622
	if (err == -ENOENT) {
		dn->cur_level = i;
		dn->max_level = level;
	}
J
Jaegeuk Kim 已提交
623 624 625 626 627
	return err;
}

static void truncate_node(struct dnode_of_data *dn)
{
628
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
J
Jaegeuk Kim 已提交
629 630 631
	struct node_info ni;

	get_node_info(sbi, dn->nid, &ni);
632
	if (dn->inode->i_blocks == 0) {
633
		f2fs_bug_on(sbi, ni.blk_addr != NULL_ADDR);
634 635
		goto invalidate;
	}
636
	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
J
Jaegeuk Kim 已提交
637 638

	/* Deallocate node address */
639
	invalidate_blocks(sbi, ni.blk_addr);
640
	dec_valid_node_count(sbi, dn->inode);
641
	set_node_addr(sbi, &ni, NULL_ADDR, false);
J
Jaegeuk Kim 已提交
642 643 644 645 646 647 648

	if (dn->nid == dn->inode->i_ino) {
		remove_orphan_inode(sbi, dn->nid);
		dec_valid_inode_count(sbi);
	} else {
		sync_inode_page(dn);
	}
649
invalidate:
J
Jaegeuk Kim 已提交
650
	clear_node_page_dirty(dn->node_page);
651
	set_sbi_flag(sbi, SBI_IS_DIRTY);
J
Jaegeuk Kim 已提交
652 653

	f2fs_put_page(dn->node_page, 1);
654 655 656 657

	invalidate_mapping_pages(NODE_MAPPING(sbi),
			dn->node_page->index, dn->node_page->index);

J
Jaegeuk Kim 已提交
658
	dn->node_page = NULL;
659
	trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
J
Jaegeuk Kim 已提交
660 661 662 663 664 665 666 667 668 669
}

static int truncate_dnode(struct dnode_of_data *dn)
{
	struct page *page;

	if (dn->nid == 0)
		return 1;

	/* get direct node */
670
	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
J
Jaegeuk Kim 已提交
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
	if (IS_ERR(page) && PTR_ERR(page) == -ENOENT)
		return 1;
	else if (IS_ERR(page))
		return PTR_ERR(page);

	/* Make dnode_of_data for parameter */
	dn->node_page = page;
	dn->ofs_in_node = 0;
	truncate_data_blocks(dn);
	truncate_node(dn);
	return 1;
}

static int truncate_nodes(struct dnode_of_data *dn, unsigned int nofs,
						int ofs, int depth)
{
	struct dnode_of_data rdn = *dn;
	struct page *page;
	struct f2fs_node *rn;
	nid_t child_nid;
	unsigned int child_nofs;
	int freed = 0;
	int i, ret;

	if (dn->nid == 0)
		return NIDS_PER_BLOCK + 1;

698 699
	trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);

700
	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
701 702
	if (IS_ERR(page)) {
		trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
J
Jaegeuk Kim 已提交
703
		return PTR_ERR(page);
704
	}
J
Jaegeuk Kim 已提交
705

706
	rn = F2FS_NODE(page);
J
Jaegeuk Kim 已提交
707 708 709 710 711 712 713 714 715
	if (depth < 3) {
		for (i = ofs; i < NIDS_PER_BLOCK; i++, freed++) {
			child_nid = le32_to_cpu(rn->in.nid[i]);
			if (child_nid == 0)
				continue;
			rdn.nid = child_nid;
			ret = truncate_dnode(&rdn);
			if (ret < 0)
				goto out_err;
716 717
			if (set_nid(page, i, 0, false))
				dn->node_changed = true;
J
Jaegeuk Kim 已提交
718 719 720 721 722 723 724 725 726 727 728 729
		}
	} else {
		child_nofs = nofs + ofs * (NIDS_PER_BLOCK + 1) + 1;
		for (i = ofs; i < NIDS_PER_BLOCK; i++) {
			child_nid = le32_to_cpu(rn->in.nid[i]);
			if (child_nid == 0) {
				child_nofs += NIDS_PER_BLOCK + 1;
				continue;
			}
			rdn.nid = child_nid;
			ret = truncate_nodes(&rdn, child_nofs, 0, depth - 1);
			if (ret == (NIDS_PER_BLOCK + 1)) {
730 731
				if (set_nid(page, i, 0, false))
					dn->node_changed = true;
J
Jaegeuk Kim 已提交
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
				child_nofs += ret;
			} else if (ret < 0 && ret != -ENOENT) {
				goto out_err;
			}
		}
		freed = child_nofs;
	}

	if (!ofs) {
		/* remove current indirect node */
		dn->node_page = page;
		truncate_node(dn);
		freed++;
	} else {
		f2fs_put_page(page, 1);
	}
748
	trace_f2fs_truncate_nodes_exit(dn->inode, freed);
J
Jaegeuk Kim 已提交
749 750 751 752
	return freed;

out_err:
	f2fs_put_page(page, 1);
753
	trace_f2fs_truncate_nodes_exit(dn->inode, ret);
J
Jaegeuk Kim 已提交
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
	return ret;
}

static int truncate_partial_nodes(struct dnode_of_data *dn,
			struct f2fs_inode *ri, int *offset, int depth)
{
	struct page *pages[2];
	nid_t nid[3];
	nid_t child_nid;
	int err = 0;
	int i;
	int idx = depth - 2;

	nid[0] = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
	if (!nid[0])
		return 0;

	/* get indirect nodes in the path */
772
	for (i = 0; i < idx + 1; i++) {
A
arter97 已提交
773
		/* reference count'll be increased */
774
		pages[i] = get_node_page(F2FS_I_SB(dn->inode), nid[i]);
J
Jaegeuk Kim 已提交
775 776
		if (IS_ERR(pages[i])) {
			err = PTR_ERR(pages[i]);
777
			idx = i - 1;
J
Jaegeuk Kim 已提交
778 779 780 781 782 783
			goto fail;
		}
		nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
	}

	/* free direct nodes linked to a partial indirect node */
784
	for (i = offset[idx + 1]; i < NIDS_PER_BLOCK; i++) {
J
Jaegeuk Kim 已提交
785 786 787 788 789 790 791
		child_nid = get_nid(pages[idx], i, false);
		if (!child_nid)
			continue;
		dn->nid = child_nid;
		err = truncate_dnode(dn);
		if (err < 0)
			goto fail;
792 793
		if (set_nid(pages[idx], i, 0, false))
			dn->node_changed = true;
J
Jaegeuk Kim 已提交
794 795
	}

796
	if (offset[idx + 1] == 0) {
J
Jaegeuk Kim 已提交
797 798 799 800 801 802 803
		dn->node_page = pages[idx];
		dn->nid = nid[idx];
		truncate_node(dn);
	} else {
		f2fs_put_page(pages[idx], 1);
	}
	offset[idx]++;
804 805
	offset[idx + 1] = 0;
	idx--;
J
Jaegeuk Kim 已提交
806
fail:
807
	for (i = idx; i >= 0; i--)
J
Jaegeuk Kim 已提交
808
		f2fs_put_page(pages[i], 1);
809 810 811

	trace_f2fs_truncate_partial_nodes(dn->inode, nid, depth, err);

J
Jaegeuk Kim 已提交
812 813 814
	return err;
}

J
Jaegeuk Kim 已提交
815
/*
J
Jaegeuk Kim 已提交
816 817 818 819
 * All the block addresses of data and nodes should be nullified.
 */
int truncate_inode_blocks(struct inode *inode, pgoff_t from)
{
820
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
J
Jaegeuk Kim 已提交
821 822
	int err = 0, cont = 1;
	int level, offset[4], noffset[4];
J
Jaegeuk Kim 已提交
823
	unsigned int nofs = 0;
824
	struct f2fs_inode *ri;
J
Jaegeuk Kim 已提交
825 826 827
	struct dnode_of_data dn;
	struct page *page;

828 829
	trace_f2fs_truncate_inode_blocks_enter(inode, from);

830
	level = get_node_path(inode, from, offset, noffset);
831
restart:
J
Jaegeuk Kim 已提交
832
	page = get_node_page(sbi, inode->i_ino);
833 834
	if (IS_ERR(page)) {
		trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
J
Jaegeuk Kim 已提交
835
		return PTR_ERR(page);
836
	}
J
Jaegeuk Kim 已提交
837 838 839 840

	set_new_dnode(&dn, inode, page, NULL, 0);
	unlock_page(page);

841
	ri = F2FS_INODE(page);
J
Jaegeuk Kim 已提交
842 843 844 845 846 847 848 849 850
	switch (level) {
	case 0:
	case 1:
		nofs = noffset[1];
		break;
	case 2:
		nofs = noffset[1];
		if (!offset[level - 1])
			goto skip_partial;
851
		err = truncate_partial_nodes(&dn, ri, offset, level);
J
Jaegeuk Kim 已提交
852 853 854 855 856 857 858 859
		if (err < 0 && err != -ENOENT)
			goto fail;
		nofs += 1 + NIDS_PER_BLOCK;
		break;
	case 3:
		nofs = 5 + 2 * NIDS_PER_BLOCK;
		if (!offset[level - 1])
			goto skip_partial;
860
		err = truncate_partial_nodes(&dn, ri, offset, level);
J
Jaegeuk Kim 已提交
861 862 863 864 865 866 867 868 869
		if (err < 0 && err != -ENOENT)
			goto fail;
		break;
	default:
		BUG();
	}

skip_partial:
	while (cont) {
870
		dn.nid = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
J
Jaegeuk Kim 已提交
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
		switch (offset[0]) {
		case NODE_DIR1_BLOCK:
		case NODE_DIR2_BLOCK:
			err = truncate_dnode(&dn);
			break;

		case NODE_IND1_BLOCK:
		case NODE_IND2_BLOCK:
			err = truncate_nodes(&dn, nofs, offset[1], 2);
			break;

		case NODE_DIND_BLOCK:
			err = truncate_nodes(&dn, nofs, offset[1], 3);
			cont = 0;
			break;

		default:
			BUG();
		}
		if (err < 0 && err != -ENOENT)
			goto fail;
		if (offset[1] == 0 &&
893
				ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {
J
Jaegeuk Kim 已提交
894
			lock_page(page);
895
			if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
896 897 898
				f2fs_put_page(page, 1);
				goto restart;
			}
899
			f2fs_wait_on_page_writeback(page, NODE, true);
900
			ri->i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
J
Jaegeuk Kim 已提交
901 902 903 904 905 906 907 908 909
			set_page_dirty(page);
			unlock_page(page);
		}
		offset[1] = 0;
		offset[0]++;
		nofs += err;
	}
fail:
	f2fs_put_page(page, 0);
910
	trace_f2fs_truncate_inode_blocks_exit(inode, err);
J
Jaegeuk Kim 已提交
911 912 913
	return err > 0 ? 0 : err;
}

914 915
int truncate_xattr_node(struct inode *inode, struct page *page)
{
916
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
917 918 919 920 921 922 923 924 925 926 927 928
	nid_t nid = F2FS_I(inode)->i_xattr_nid;
	struct dnode_of_data dn;
	struct page *npage;

	if (!nid)
		return 0;

	npage = get_node_page(sbi, nid);
	if (IS_ERR(npage))
		return PTR_ERR(npage);

	F2FS_I(inode)->i_xattr_nid = 0;
J
Jaegeuk Kim 已提交
929 930 931 932

	/* need to do checkpoint during fsync */
	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));

933 934 935
	set_new_dnode(&dn, inode, page, npage, nid);

	if (page)
936
		dn.inode_page_locked = true;
937 938 939 940
	truncate_node(&dn);
	return 0;
}

941
/*
C
Chao Yu 已提交
942 943
 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
 * f2fs_unlock_op().
944
 */
C
Chao Yu 已提交
945
int remove_inode_page(struct inode *inode)
J
Jaegeuk Kim 已提交
946 947
{
	struct dnode_of_data dn;
C
Chao Yu 已提交
948
	int err;
J
Jaegeuk Kim 已提交
949

950
	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
C
Chao Yu 已提交
951 952 953
	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	if (err)
		return err;
J
Jaegeuk Kim 已提交
954

C
Chao Yu 已提交
955 956
	err = truncate_xattr_node(inode, dn.inode_page);
	if (err) {
957
		f2fs_put_dnode(&dn);
C
Chao Yu 已提交
958
		return err;
J
Jaegeuk Kim 已提交
959
	}
960 961 962 963 964 965

	/* remove potential inline_data blocks */
	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
				S_ISLNK(inode->i_mode))
		truncate_data_blocks_range(&dn, 1);

A
arter97 已提交
966
	/* 0 is possible, after f2fs_new_inode() has failed */
967 968
	f2fs_bug_on(F2FS_I_SB(inode),
			inode->i_blocks != 0 && inode->i_blocks != 1);
969 970

	/* will put inode & node pages */
971
	truncate_node(&dn);
C
Chao Yu 已提交
972
	return 0;
J
Jaegeuk Kim 已提交
973 974
}

975
struct page *new_inode_page(struct inode *inode)
J
Jaegeuk Kim 已提交
976 977 978 979 980
{
	struct dnode_of_data dn;

	/* allocate inode page for new inode */
	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
981 982

	/* caller should f2fs_put_page(page, 1); */
983
	return new_node_page(&dn, 0, NULL);
J
Jaegeuk Kim 已提交
984 985
}

986 987
struct page *new_node_page(struct dnode_of_data *dn,
				unsigned int ofs, struct page *ipage)
J
Jaegeuk Kim 已提交
988
{
989
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
J
Jaegeuk Kim 已提交
990 991 992 993
	struct node_info old_ni, new_ni;
	struct page *page;
	int err;

994
	if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
J
Jaegeuk Kim 已提交
995 996
		return ERR_PTR(-EPERM);

997
	page = grab_cache_page(NODE_MAPPING(sbi), dn->nid);
J
Jaegeuk Kim 已提交
998 999 1000
	if (!page)
		return ERR_PTR(-ENOMEM);

1001
	if (unlikely(!inc_valid_node_count(sbi, dn->inode))) {
1002 1003 1004
		err = -ENOSPC;
		goto fail;
	}
J
Jaegeuk Kim 已提交
1005

1006
	get_node_info(sbi, dn->nid, &old_ni);
J
Jaegeuk Kim 已提交
1007 1008

	/* Reinitialize old_ni with new node page */
1009
	f2fs_bug_on(sbi, old_ni.blk_addr != NULL_ADDR);
J
Jaegeuk Kim 已提交
1010 1011
	new_ni = old_ni;
	new_ni.ino = dn->inode->i_ino;
1012
	set_node_addr(sbi, &new_ni, NEW_ADDR, false);
1013

1014
	f2fs_wait_on_page_writeback(page, NODE, true);
1015
	fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
1016
	set_cold_node(dn->inode, page);
1017
	SetPageUptodate(page);
1018 1019
	if (set_page_dirty(page))
		dn->node_changed = true;
J
Jaegeuk Kim 已提交
1020

1021
	if (f2fs_has_xattr_block(ofs))
1022 1023
		F2FS_I(dn->inode)->i_xattr_nid = dn->nid;

J
Jaegeuk Kim 已提交
1024
	dn->node_page = page;
1025 1026 1027 1028
	if (ipage)
		update_inode(dn->inode, ipage);
	else
		sync_inode_page(dn);
J
Jaegeuk Kim 已提交
1029 1030 1031 1032 1033 1034
	if (ofs == 0)
		inc_valid_inode_count(sbi);

	return page;

fail:
1035
	clear_node_page_dirty(page);
J
Jaegeuk Kim 已提交
1036 1037 1038 1039
	f2fs_put_page(page, 1);
	return ERR_PTR(err);
}

1040 1041 1042
/*
 * Caller should do after getting the following values.
 * 0: f2fs_put_page(page, 0)
1043
 * LOCKED_PAGE or error: f2fs_put_page(page, 1)
1044
 */
1045
static int read_node_page(struct page *page, int rw)
J
Jaegeuk Kim 已提交
1046
{
1047
	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
J
Jaegeuk Kim 已提交
1048
	struct node_info ni;
1049
	struct f2fs_io_info fio = {
1050
		.sbi = sbi,
1051 1052
		.type = NODE,
		.rw = rw,
1053
		.page = page,
1054
		.encrypted_page = NULL,
1055
	};
J
Jaegeuk Kim 已提交
1056 1057 1058

	get_node_info(sbi, page->index, &ni);

1059
	if (unlikely(ni.blk_addr == NULL_ADDR)) {
1060
		ClearPageUptodate(page);
J
Jaegeuk Kim 已提交
1061
		return -ENOENT;
1062 1063
	}

1064 1065
	if (PageUptodate(page))
		return LOCKED_PAGE;
1066

1067
	fio.blk_addr = ni.blk_addr;
1068
	return f2fs_submit_page_bio(&fio);
J
Jaegeuk Kim 已提交
1069 1070
}

J
Jaegeuk Kim 已提交
1071
/*
J
Jaegeuk Kim 已提交
1072 1073 1074 1075 1076
 * Readahead a node page
 */
void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
{
	struct page *apage;
1077
	int err;
J
Jaegeuk Kim 已提交
1078

1079 1080 1081 1082
	if (!nid)
		return;
	f2fs_bug_on(sbi, check_nid_range(sbi, nid));

1083
	apage = find_get_page(NODE_MAPPING(sbi), nid);
1084 1085 1086 1087
	if (apage && PageUptodate(apage)) {
		f2fs_put_page(apage, 0);
		return;
	}
J
Jaegeuk Kim 已提交
1088 1089
	f2fs_put_page(apage, 0);

1090
	apage = grab_cache_page(NODE_MAPPING(sbi), nid);
J
Jaegeuk Kim 已提交
1091 1092 1093
	if (!apage)
		return;

1094
	err = read_node_page(apage, READA);
1095
	f2fs_put_page(apage, err ? 1 : 0);
J
Jaegeuk Kim 已提交
1096 1097
}

1098 1099 1100 1101
/*
 * readahead MAX_RA_NODE number of node pages.
 */
void ra_node_pages(struct page *parent, int start)
J
Jaegeuk Kim 已提交
1102
{
1103 1104 1105 1106
	struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
	struct blk_plug plug;
	int i, end;
	nid_t nid;
1107

1108
	blk_start_plug(&plug);
J
Jaegeuk Kim 已提交
1109

1110 1111 1112 1113 1114 1115
	/* Then, try readahead for siblings of the desired node */
	end = start + MAX_RA_NODE;
	end = min(end, NIDS_PER_BLOCK);
	for (i = start; i < end; i++) {
		nid = get_nid(parent, i, false);
		ra_node_page(sbi, nid);
1116
	}
J
Jaegeuk Kim 已提交
1117

1118
	blk_finish_plug(&plug);
J
Jaegeuk Kim 已提交
1119 1120
}

1121 1122
struct page *__get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid,
					struct page *parent, int start)
J
Jaegeuk Kim 已提交
1123 1124
{
	struct page *page;
1125
	int err;
J
Jaegeuk Kim 已提交
1126 1127 1128

	if (!nid)
		return ERR_PTR(-ENOENT);
1129
	f2fs_bug_on(sbi, check_nid_range(sbi, nid));
1130
repeat:
1131
	page = grab_cache_page(NODE_MAPPING(sbi), nid);
J
Jaegeuk Kim 已提交
1132 1133 1134
	if (!page)
		return ERR_PTR(-ENOMEM);

1135
	err = read_node_page(page, READ_SYNC);
1136 1137
	if (err < 0) {
		f2fs_put_page(page, 1);
J
Jaegeuk Kim 已提交
1138
		return ERR_PTR(err);
1139
	} else if (err == LOCKED_PAGE) {
1140
		goto page_hit;
1141
	}
J
Jaegeuk Kim 已提交
1142

1143 1144
	if (parent)
		ra_node_pages(parent, start + 1);
1145

J
Jaegeuk Kim 已提交
1146
	lock_page(page);
1147

C
Chao Yu 已提交
1148 1149 1150 1151
	if (unlikely(!PageUptodate(page))) {
		f2fs_put_page(page, 1);
		return ERR_PTR(-EIO);
	}
1152
	if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1153 1154 1155
		f2fs_put_page(page, 1);
		goto repeat;
	}
1156
page_hit:
C
Chao Yu 已提交
1157
	f2fs_bug_on(sbi, nid != nid_of_node(page));
J
Jaegeuk Kim 已提交
1158 1159 1160
	return page;
}

1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
{
	return __get_node_page(sbi, nid, NULL, 0);
}

struct page *get_node_page_ra(struct page *parent, int start)
{
	struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
	nid_t nid = get_nid(parent, start, false);

	return __get_node_page(sbi, nid, parent, start);
}

J
Jaegeuk Kim 已提交
1174 1175
void sync_inode_page(struct dnode_of_data *dn)
{
1176 1177
	int ret = 0;

J
Jaegeuk Kim 已提交
1178
	if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
1179
		ret = update_inode(dn->inode, dn->node_page);
J
Jaegeuk Kim 已提交
1180 1181 1182
	} else if (dn->inode_page) {
		if (!dn->inode_page_locked)
			lock_page(dn->inode_page);
1183
		ret = update_inode(dn->inode, dn->inode_page);
J
Jaegeuk Kim 已提交
1184 1185 1186
		if (!dn->inode_page_locked)
			unlock_page(dn->inode_page);
	} else {
1187
		ret = update_inode_page(dn->inode);
J
Jaegeuk Kim 已提交
1188
	}
1189
	dn->node_changed = ret ? true: false;
J
Jaegeuk Kim 已提交
1190 1191
}

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
static void flush_inline_data(struct f2fs_sb_info *sbi, nid_t ino)
{
	struct inode *inode;
	struct page *page;

	/* should flush inline_data before evict_inode */
	inode = ilookup(sbi->sb, ino);
	if (!inode)
		return;

	page = pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
	if (!page)
		goto iput_out;

	if (!PageUptodate(page))
		goto page_out;

	if (!PageDirty(page))
		goto page_out;

	if (!clear_page_dirty_for_io(page))
		goto page_out;

	if (!f2fs_write_inline_data(inode, page))
		inode_dec_dirty_pages(inode);
	else
		set_page_dirty(page);
page_out:
	f2fs_put_page(page, 1);
iput_out:
	iput(inode);
}

J
Jaegeuk Kim 已提交
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
int sync_node_pages(struct f2fs_sb_info *sbi, nid_t ino,
					struct writeback_control *wbc)
{
	pgoff_t index, end;
	struct pagevec pvec;
	int step = ino ? 2 : 0;
	int nwritten = 0, wrote = 0;

	pagevec_init(&pvec, 0);

next_step:
	index = 0;
	end = LONG_MAX;

	while (index <= end) {
		int i, nr_pages;
1241
		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
J
Jaegeuk Kim 已提交
1242 1243 1244 1245 1246 1247 1248 1249
				PAGECACHE_TAG_DIRTY,
				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
		if (nr_pages == 0)
			break;

		for (i = 0; i < nr_pages; i++) {
			struct page *page = pvec.pages[i];

C
Chao Yu 已提交
1250 1251 1252 1253 1254
			if (unlikely(f2fs_cp_error(sbi))) {
				pagevec_release(&pvec);
				return -EIO;
			}

J
Jaegeuk Kim 已提交
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
			/*
			 * flushing sequence with step:
			 * 0. indirect nodes
			 * 1. dentry dnodes
			 * 2. file dnodes
			 */
			if (step == 0 && IS_DNODE(page))
				continue;
			if (step == 1 && (!IS_DNODE(page) ||
						is_cold_node(page)))
				continue;
			if (step == 2 && (!IS_DNODE(page) ||
						!is_cold_node(page)))
				continue;

			/*
			 * If an fsync mode,
			 * we should not skip writing node pages.
			 */
			if (ino && ino_of_node(page) == ino)
				lock_page(page);
			else if (!trylock_page(page))
				continue;

1279
			if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
J
Jaegeuk Kim 已提交
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
continue_unlock:
				unlock_page(page);
				continue;
			}
			if (ino && ino_of_node(page) != ino)
				goto continue_unlock;

			if (!PageDirty(page)) {
				/* someone wrote it for us */
				goto continue_unlock;
			}

1292 1293 1294 1295 1296 1297 1298 1299
			/* flush inline_data */
			if (!ino && is_inline_node(page)) {
				clear_inline_node(page);
				unlock_page(page);
				flush_inline_data(sbi, ino_of_node(page));
				continue;
			}

1300 1301 1302
			f2fs_wait_on_page_writeback(page, NODE, true);

			BUG_ON(PageWriteback(page));
J
Jaegeuk Kim 已提交
1303 1304 1305 1306 1307 1308
			if (!clear_page_dirty_for_io(page))
				goto continue_unlock;

			/* called by fsync() */
			if (ino && IS_DNODE(page)) {
				set_fsync_mark(page, 1);
J
Jaegeuk Kim 已提交
1309 1310 1311
				if (IS_INODE(page))
					set_dentry_mark(page,
						need_dentry_mark(sbi, ino));
J
Jaegeuk Kim 已提交
1312 1313 1314 1315 1316
				nwritten++;
			} else {
				set_fsync_mark(page, 0);
				set_dentry_mark(page, 0);
			}
1317 1318 1319 1320 1321

			if (NODE_MAPPING(sbi)->a_ops->writepage(page, wbc))
				unlock_page(page);
			else
				wrote++;
J
Jaegeuk Kim 已提交
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339

			if (--wbc->nr_to_write == 0)
				break;
		}
		pagevec_release(&pvec);
		cond_resched();

		if (wbc->nr_to_write == 0) {
			step = 2;
			break;
		}
	}

	if (step < 2) {
		step++;
		goto next_step;
	}

1340 1341 1342 1343 1344 1345 1346
	if (wrote) {
		if (ino)
			f2fs_submit_merged_bio_cond(sbi, NULL, NULL,
							ino, NODE, WRITE);
		else
			f2fs_submit_merged_bio(sbi, NODE, WRITE);
	}
J
Jaegeuk Kim 已提交
1347 1348 1349
	return nwritten;
}

1350 1351 1352 1353 1354 1355 1356
int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
{
	pgoff_t index = 0, end = LONG_MAX;
	struct pagevec pvec;
	int ret2 = 0, ret = 0;

	pagevec_init(&pvec, 0);
1357 1358 1359 1360 1361 1362 1363 1364

	while (index <= end) {
		int i, nr_pages;
		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
				PAGECACHE_TAG_WRITEBACK,
				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
		if (nr_pages == 0)
			break;
1365 1366 1367 1368 1369

		for (i = 0; i < nr_pages; i++) {
			struct page *page = pvec.pages[i];

			/* until radix tree lookup accepts end_index */
1370
			if (unlikely(page->index > end))
1371 1372
				continue;

1373
			if (ino && ino_of_node(page) == ino) {
1374
				f2fs_wait_on_page_writeback(page, NODE, true);
1375 1376 1377
				if (TestClearPageError(page))
					ret = -EIO;
			}
1378 1379 1380 1381 1382
		}
		pagevec_release(&pvec);
		cond_resched();
	}

1383
	if (unlikely(test_and_clear_bit(AS_ENOSPC, &NODE_MAPPING(sbi)->flags)))
1384
		ret2 = -ENOSPC;
1385
	if (unlikely(test_and_clear_bit(AS_EIO, &NODE_MAPPING(sbi)->flags)))
1386 1387 1388 1389 1390 1391
		ret2 = -EIO;
	if (!ret)
		ret = ret2;
	return ret;
}

J
Jaegeuk Kim 已提交
1392 1393 1394
static int f2fs_write_node_page(struct page *page,
				struct writeback_control *wbc)
{
1395
	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
J
Jaegeuk Kim 已提交
1396 1397
	nid_t nid;
	struct node_info ni;
1398
	struct f2fs_io_info fio = {
1399
		.sbi = sbi,
1400
		.type = NODE,
C
Chris Fries 已提交
1401
		.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
1402
		.page = page,
1403
		.encrypted_page = NULL,
1404
	};
J
Jaegeuk Kim 已提交
1405

1406 1407
	trace_f2fs_writepage(page, NODE);

1408
	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1409
		goto redirty_out;
1410 1411
	if (unlikely(f2fs_cp_error(sbi)))
		goto redirty_out;
1412

J
Jaegeuk Kim 已提交
1413 1414
	/* get old block addr of this node page */
	nid = nid_of_node(page);
1415
	f2fs_bug_on(sbi, page->index != nid);
J
Jaegeuk Kim 已提交
1416

1417 1418 1419 1420 1421 1422 1423
	if (wbc->for_reclaim) {
		if (!down_read_trylock(&sbi->node_write))
			goto redirty_out;
	} else {
		down_read(&sbi->node_write);
	}

J
Jaegeuk Kim 已提交
1424 1425 1426
	get_node_info(sbi, nid, &ni);

	/* This page is already truncated */
1427
	if (unlikely(ni.blk_addr == NULL_ADDR)) {
1428
		ClearPageUptodate(page);
1429
		dec_page_count(sbi, F2FS_DIRTY_NODES);
1430
		up_read(&sbi->node_write);
1431 1432 1433
		unlock_page(page);
		return 0;
	}
J
Jaegeuk Kim 已提交
1434 1435

	set_page_writeback(page);
1436
	fio.blk_addr = ni.blk_addr;
1437
	write_node_page(nid, &fio);
1438
	set_node_addr(sbi, &ni, fio.blk_addr, is_fsync_dnode(page));
J
Jaegeuk Kim 已提交
1439
	dec_page_count(sbi, F2FS_DIRTY_NODES);
1440
	up_read(&sbi->node_write);
1441 1442 1443 1444

	if (wbc->for_reclaim)
		f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, NODE, WRITE);

J
Jaegeuk Kim 已提交
1445
	unlock_page(page);
1446

1447
	if (unlikely(f2fs_cp_error(sbi)))
1448 1449
		f2fs_submit_merged_bio(sbi, NODE, WRITE);

J
Jaegeuk Kim 已提交
1450
	return 0;
1451 1452

redirty_out:
1453
	redirty_page_for_writepage(wbc, page);
1454
	return AOP_WRITEPAGE_ACTIVATE;
J
Jaegeuk Kim 已提交
1455 1456 1457 1458 1459
}

static int f2fs_write_node_pages(struct address_space *mapping,
			    struct writeback_control *wbc)
{
1460
	struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1461
	long diff;
J
Jaegeuk Kim 已提交
1462

1463 1464
	/* balancing f2fs's metadata in background */
	f2fs_balance_fs_bg(sbi);
J
Jaegeuk Kim 已提交
1465

1466
	/* collect a number of dirty node pages and write together */
1467
	if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
1468
		goto skip_write;
1469

Y
Yunlei He 已提交
1470 1471
	trace_f2fs_writepages(mapping->host, wbc, NODE);

1472
	diff = nr_pages_to_write(sbi, NODE, wbc);
1473
	wbc->sync_mode = WB_SYNC_NONE;
J
Jaegeuk Kim 已提交
1474
	sync_node_pages(sbi, 0, wbc);
1475
	wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
J
Jaegeuk Kim 已提交
1476
	return 0;
1477 1478 1479

skip_write:
	wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_NODES);
Y
Yunlei He 已提交
1480
	trace_f2fs_writepages(mapping->host, wbc, NODE);
1481
	return 0;
J
Jaegeuk Kim 已提交
1482 1483 1484 1485
}

static int f2fs_set_node_page_dirty(struct page *page)
{
1486 1487
	trace_f2fs_set_page_dirty(page, NODE);

J
Jaegeuk Kim 已提交
1488 1489 1490
	SetPageUptodate(page);
	if (!PageDirty(page)) {
		__set_page_dirty_nobuffers(page);
1491
		inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_NODES);
J
Jaegeuk Kim 已提交
1492
		SetPagePrivate(page);
J
Jaegeuk Kim 已提交
1493
		f2fs_trace_pid(page);
J
Jaegeuk Kim 已提交
1494 1495 1496 1497 1498
		return 1;
	}
	return 0;
}

J
Jaegeuk Kim 已提交
1499
/*
J
Jaegeuk Kim 已提交
1500 1501 1502 1503 1504 1505
 * Structure of the f2fs node operations
 */
const struct address_space_operations f2fs_node_aops = {
	.writepage	= f2fs_write_node_page,
	.writepages	= f2fs_write_node_pages,
	.set_page_dirty	= f2fs_set_node_page_dirty,
1506 1507
	.invalidatepage	= f2fs_invalidate_page,
	.releasepage	= f2fs_release_page,
J
Jaegeuk Kim 已提交
1508 1509
};

1510 1511
static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
						nid_t n)
J
Jaegeuk Kim 已提交
1512
{
1513
	return radix_tree_lookup(&nm_i->free_nid_root, n);
J
Jaegeuk Kim 已提交
1514 1515
}

1516 1517
static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
						struct free_nid *i)
J
Jaegeuk Kim 已提交
1518 1519
{
	list_del(&i->list);
1520
	radix_tree_delete(&nm_i->free_nid_root, i->nid);
J
Jaegeuk Kim 已提交
1521 1522
}

1523
static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
J
Jaegeuk Kim 已提交
1524
{
1525
	struct f2fs_nm_info *nm_i = NM_I(sbi);
J
Jaegeuk Kim 已提交
1526
	struct free_nid *i;
1527 1528
	struct nat_entry *ne;
	bool allocated = false;
J
Jaegeuk Kim 已提交
1529

1530
	if (!available_free_memory(sbi, FREE_NIDS))
H
Haicheng Li 已提交
1531
		return -1;
1532 1533

	/* 0 nid should not be used */
1534
	if (unlikely(nid == 0))
1535
		return 0;
1536

1537 1538 1539
	if (build) {
		/* do not add allocated nids */
		ne = __lookup_nat_cache(nm_i, nid);
1540
		if (ne && (!get_nat_flag(ne, IS_CHECKPOINTED) ||
1541
				nat_get_blkaddr(ne) != NULL_ADDR))
1542 1543 1544
			allocated = true;
		if (allocated)
			return 0;
J
Jaegeuk Kim 已提交
1545
	}
1546 1547

	i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
J
Jaegeuk Kim 已提交
1548 1549 1550
	i->nid = nid;
	i->state = NID_NEW;

1551 1552 1553 1554 1555
	if (radix_tree_preload(GFP_NOFS)) {
		kmem_cache_free(free_nid_slab, i);
		return 0;
	}

J
Jaegeuk Kim 已提交
1556
	spin_lock(&nm_i->free_nid_list_lock);
1557
	if (radix_tree_insert(&nm_i->free_nid_root, i->nid, i)) {
J
Jaegeuk Kim 已提交
1558
		spin_unlock(&nm_i->free_nid_list_lock);
1559
		radix_tree_preload_end();
J
Jaegeuk Kim 已提交
1560 1561 1562 1563 1564 1565
		kmem_cache_free(free_nid_slab, i);
		return 0;
	}
	list_add_tail(&i->list, &nm_i->free_nid_list);
	nm_i->fcnt++;
	spin_unlock(&nm_i->free_nid_list_lock);
1566
	radix_tree_preload_end();
J
Jaegeuk Kim 已提交
1567 1568 1569 1570 1571 1572
	return 1;
}

static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
{
	struct free_nid *i;
1573 1574
	bool need_free = false;

J
Jaegeuk Kim 已提交
1575
	spin_lock(&nm_i->free_nid_list_lock);
1576
	i = __lookup_free_nid_list(nm_i, nid);
J
Jaegeuk Kim 已提交
1577
	if (i && i->state == NID_NEW) {
1578
		__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
1579
		nm_i->fcnt--;
1580
		need_free = true;
J
Jaegeuk Kim 已提交
1581 1582
	}
	spin_unlock(&nm_i->free_nid_list_lock);
1583 1584 1585

	if (need_free)
		kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1586 1587
}

1588
static void scan_nat_page(struct f2fs_sb_info *sbi,
J
Jaegeuk Kim 已提交
1589 1590
			struct page *nat_page, nid_t start_nid)
{
1591
	struct f2fs_nm_info *nm_i = NM_I(sbi);
J
Jaegeuk Kim 已提交
1592 1593 1594 1595 1596 1597 1598
	struct f2fs_nat_block *nat_blk = page_address(nat_page);
	block_t blk_addr;
	int i;

	i = start_nid % NAT_ENTRY_PER_BLOCK;

	for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
H
Haicheng Li 已提交
1599

1600
		if (unlikely(start_nid >= nm_i->max_nid))
J
Jaegeuk Kim 已提交
1601
			break;
H
Haicheng Li 已提交
1602 1603

		blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
1604
		f2fs_bug_on(sbi, blk_addr == NEW_ADDR);
H
Haicheng Li 已提交
1605
		if (blk_addr == NULL_ADDR) {
1606
			if (add_free_nid(sbi, start_nid, true) < 0)
H
Haicheng Li 已提交
1607 1608
				break;
		}
J
Jaegeuk Kim 已提交
1609 1610 1611 1612 1613 1614 1615
	}
}

static void build_free_nids(struct f2fs_sb_info *sbi)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1616
	struct f2fs_journal *journal = curseg->journal;
1617
	int i = 0;
1618
	nid_t nid = nm_i->next_scan_nid;
J
Jaegeuk Kim 已提交
1619

1620 1621 1622
	/* Enough entries */
	if (nm_i->fcnt > NAT_ENTRY_PER_BLOCK)
		return;
J
Jaegeuk Kim 已提交
1623

1624
	/* readahead nat pages to be scanned */
1625 1626
	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
							META_NAT, true);
J
Jaegeuk Kim 已提交
1627

1628 1629
	down_read(&nm_i->nat_tree_lock);

J
Jaegeuk Kim 已提交
1630 1631 1632
	while (1) {
		struct page *page = get_current_nat_page(sbi, nid);

1633
		scan_nat_page(sbi, page, nid);
J
Jaegeuk Kim 已提交
1634 1635 1636
		f2fs_put_page(page, 1);

		nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
1637
		if (unlikely(nid >= nm_i->max_nid))
J
Jaegeuk Kim 已提交
1638
			nid = 0;
1639

1640
		if (++i >= FREE_NID_PAGES)
J
Jaegeuk Kim 已提交
1641 1642 1643
			break;
	}

1644 1645
	/* go to the next free nat pages to find free nids abundantly */
	nm_i->next_scan_nid = nid;
J
Jaegeuk Kim 已提交
1646 1647

	/* find free nids from current sum_pages */
1648
	down_read(&curseg->journal_rwsem);
1649 1650 1651 1652 1653
	for (i = 0; i < nats_in_cursum(journal); i++) {
		block_t addr;

		addr = le32_to_cpu(nat_in_journal(journal, i).block_addr);
		nid = le32_to_cpu(nid_in_journal(journal, i));
J
Jaegeuk Kim 已提交
1654
		if (addr == NULL_ADDR)
1655
			add_free_nid(sbi, nid, true);
J
Jaegeuk Kim 已提交
1656 1657 1658
		else
			remove_free_nid(nm_i, nid);
	}
1659
	up_read(&curseg->journal_rwsem);
1660
	up_read(&nm_i->nat_tree_lock);
C
Chao Yu 已提交
1661 1662

	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),
C
Chao Yu 已提交
1663
					nm_i->ra_nid_pages, META_NAT, false);
J
Jaegeuk Kim 已提交
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
}

/*
 * If this function returns success, caller can obtain a new nid
 * from second parameter of this function.
 * The returned nid could be used ino as well as nid when inode is created.
 */
bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i = NULL;
retry:
1676
	if (unlikely(sbi->total_valid_node_count + 1 > nm_i->available_nids))
1677
		return false;
J
Jaegeuk Kim 已提交
1678 1679 1680

	spin_lock(&nm_i->free_nid_list_lock);

1681
	/* We should not use stale free nids created by build_free_nids */
1682
	if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
1683
		f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
1684
		list_for_each_entry(i, &nm_i->free_nid_list, list)
1685 1686
			if (i->state == NID_NEW)
				break;
J
Jaegeuk Kim 已提交
1687

1688
		f2fs_bug_on(sbi, i->state != NID_NEW);
1689 1690 1691 1692 1693 1694
		*nid = i->nid;
		i->state = NID_ALLOC;
		nm_i->fcnt--;
		spin_unlock(&nm_i->free_nid_list_lock);
		return true;
	}
J
Jaegeuk Kim 已提交
1695
	spin_unlock(&nm_i->free_nid_list_lock);
1696 1697 1698 1699 1700 1701

	/* Let's scan nat pages and its caches to get free nids */
	mutex_lock(&nm_i->build_lock);
	build_free_nids(sbi);
	mutex_unlock(&nm_i->build_lock);
	goto retry;
J
Jaegeuk Kim 已提交
1702 1703
}

J
Jaegeuk Kim 已提交
1704
/*
J
Jaegeuk Kim 已提交
1705 1706 1707 1708 1709 1710 1711 1712
 * alloc_nid() should be called prior to this function.
 */
void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i;

	spin_lock(&nm_i->free_nid_list_lock);
1713
	i = __lookup_free_nid_list(nm_i, nid);
1714
	f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1715
	__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
1716
	spin_unlock(&nm_i->free_nid_list_lock);
1717 1718

	kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1719 1720
}

J
Jaegeuk Kim 已提交
1721
/*
J
Jaegeuk Kim 已提交
1722 1723 1724 1725
 * alloc_nid() should be called prior to this function.
 */
void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
{
1726 1727
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i;
1728
	bool need_free = false;
1729

J
Jaegeuk Kim 已提交
1730 1731 1732
	if (!nid)
		return;

1733
	spin_lock(&nm_i->free_nid_list_lock);
1734
	i = __lookup_free_nid_list(nm_i, nid);
1735
	f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1736
	if (!available_free_memory(sbi, FREE_NIDS)) {
1737
		__del_from_free_nid_list(nm_i, i);
1738
		need_free = true;
1739 1740 1741 1742
	} else {
		i->state = NID_NEW;
		nm_i->fcnt++;
	}
1743
	spin_unlock(&nm_i->free_nid_list_lock);
1744 1745 1746

	if (need_free)
		kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1747 1748
}

C
Chao Yu 已提交
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i, *next;
	int nr = nr_shrink;

	if (!mutex_trylock(&nm_i->build_lock))
		return 0;

	spin_lock(&nm_i->free_nid_list_lock);
	list_for_each_entry_safe(i, next, &nm_i->free_nid_list, list) {
		if (nr_shrink <= 0 || nm_i->fcnt <= NAT_ENTRY_PER_BLOCK)
			break;
		if (i->state == NID_ALLOC)
			continue;
		__del_from_free_nid_list(nm_i, i);
		kmem_cache_free(free_nid_slab, i);
1766
		nm_i->fcnt--;
C
Chao Yu 已提交
1767 1768 1769 1770 1771 1772 1773 1774
		nr_shrink--;
	}
	spin_unlock(&nm_i->free_nid_list_lock);
	mutex_unlock(&nm_i->build_lock);

	return nr - nr_shrink;
}

1775
void recover_inline_xattr(struct inode *inode, struct page *page)
1776 1777 1778 1779 1780 1781
{
	void *src_addr, *dst_addr;
	size_t inline_size;
	struct page *ipage;
	struct f2fs_inode *ri;

1782
	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
1783
	f2fs_bug_on(F2FS_I_SB(inode), IS_ERR(ipage));
1784

1785 1786 1787 1788 1789 1790
	ri = F2FS_INODE(page);
	if (!(ri->i_inline & F2FS_INLINE_XATTR)) {
		clear_inode_flag(F2FS_I(inode), FI_INLINE_XATTR);
		goto update_inode;
	}

1791 1792 1793 1794
	dst_addr = inline_xattr_addr(ipage);
	src_addr = inline_xattr_addr(page);
	inline_size = inline_xattr_size(inode);

1795
	f2fs_wait_on_page_writeback(ipage, NODE, true);
1796
	memcpy(dst_addr, src_addr, inline_size);
1797
update_inode:
1798 1799 1800 1801
	update_inode(inode, ipage);
	f2fs_put_page(ipage, 1);
}

1802
void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
1803
{
1804
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
	nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
	nid_t new_xnid = nid_of_node(page);
	struct node_info ni;

	/* 1: invalidate the previous xattr nid */
	if (!prev_xnid)
		goto recover_xnid;

	/* Deallocate node address */
	get_node_info(sbi, prev_xnid, &ni);
1815
	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
1816 1817
	invalidate_blocks(sbi, ni.blk_addr);
	dec_valid_node_count(sbi, inode);
1818
	set_node_addr(sbi, &ni, NULL_ADDR, false);
1819 1820 1821 1822

recover_xnid:
	/* 2: allocate new xattr nid */
	if (unlikely(!inc_valid_node_count(sbi, inode)))
1823
		f2fs_bug_on(sbi, 1);
1824 1825 1826 1827

	remove_free_nid(NM_I(sbi), new_xnid);
	get_node_info(sbi, new_xnid, &ni);
	ni.ino = inode->i_ino;
1828
	set_node_addr(sbi, &ni, NEW_ADDR, false);
1829 1830 1831 1832
	F2FS_I(inode)->i_xattr_nid = new_xnid;

	/* 3: update xattr blkaddr */
	refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
1833
	set_node_addr(sbi, &ni, blkaddr, false);
1834 1835 1836 1837

	update_inode_page(inode);
}

J
Jaegeuk Kim 已提交
1838 1839
int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
{
1840
	struct f2fs_inode *src, *dst;
J
Jaegeuk Kim 已提交
1841 1842 1843 1844
	nid_t ino = ino_of_node(page);
	struct node_info old_ni, new_ni;
	struct page *ipage;

1845 1846 1847 1848 1849
	get_node_info(sbi, ino, &old_ni);

	if (unlikely(old_ni.blk_addr != NULL_ADDR))
		return -EINVAL;

1850
	ipage = grab_cache_page(NODE_MAPPING(sbi), ino);
J
Jaegeuk Kim 已提交
1851 1852 1853
	if (!ipage)
		return -ENOMEM;

A
arter97 已提交
1854
	/* Should not use this inode from free nid list */
J
Jaegeuk Kim 已提交
1855 1856 1857 1858 1859
	remove_free_nid(NM_I(sbi), ino);

	SetPageUptodate(ipage);
	fill_node_footer(ipage, ino, ino, 0, true);

1860 1861
	src = F2FS_INODE(page);
	dst = F2FS_INODE(ipage);
J
Jaegeuk Kim 已提交
1862

1863 1864 1865 1866 1867
	memcpy(dst, src, (unsigned long)&src->i_ext - (unsigned long)src);
	dst->i_size = 0;
	dst->i_blocks = cpu_to_le64(1);
	dst->i_links = cpu_to_le32(1);
	dst->i_xattr_nid = 0;
1868
	dst->i_inline = src->i_inline & F2FS_INLINE_XATTR;
J
Jaegeuk Kim 已提交
1869 1870 1871 1872

	new_ni = old_ni;
	new_ni.ino = ino;

1873
	if (unlikely(!inc_valid_node_count(sbi, NULL)))
1874
		WARN_ON(1);
1875
	set_node_addr(sbi, &new_ni, NEW_ADDR, false);
J
Jaegeuk Kim 已提交
1876
	inc_valid_inode_count(sbi);
1877
	set_page_dirty(ipage);
J
Jaegeuk Kim 已提交
1878 1879 1880 1881 1882 1883 1884 1885 1886 1887
	f2fs_put_page(ipage, 1);
	return 0;
}

int restore_node_summary(struct f2fs_sb_info *sbi,
			unsigned int segno, struct f2fs_summary_block *sum)
{
	struct f2fs_node *rn;
	struct f2fs_summary *sum_entry;
	block_t addr;
J
Jaegeuk Kim 已提交
1888
	int bio_blocks = MAX_BIO_BLOCKS(sbi);
1889
	int i, idx, last_offset, nrpages;
J
Jaegeuk Kim 已提交
1890 1891 1892 1893 1894 1895

	/* scan the node segment */
	last_offset = sbi->blocks_per_seg;
	addr = START_BLOCK(sbi, segno);
	sum_entry = &sum->entries[0];

1896
	for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
1897
		nrpages = min(last_offset - i, bio_blocks);
1898

A
arter97 已提交
1899
		/* readahead node pages */
1900
		ra_meta_pages(sbi, addr, nrpages, META_POR, true);
J
Jaegeuk Kim 已提交
1901

1902
		for (idx = addr; idx < addr + nrpages; idx++) {
1903
			struct page *page = get_tmp_page(sbi, idx);
1904

1905 1906 1907 1908 1909 1910
			rn = F2FS_NODE(page);
			sum_entry->nid = rn->footer.nid;
			sum_entry->version = 0;
			sum_entry->ofs_in_node = 0;
			sum_entry++;
			f2fs_put_page(page, 1);
1911
		}
1912

1913
		invalidate_mapping_pages(META_MAPPING(sbi), addr,
1914
							addr + nrpages);
J
Jaegeuk Kim 已提交
1915
	}
1916
	return 0;
J
Jaegeuk Kim 已提交
1917 1918
}

1919
static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
J
Jaegeuk Kim 已提交
1920 1921 1922
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1923
	struct f2fs_journal *journal = curseg->journal;
J
Jaegeuk Kim 已提交
1924 1925
	int i;

1926
	down_write(&curseg->journal_rwsem);
1927
	for (i = 0; i < nats_in_cursum(journal); i++) {
J
Jaegeuk Kim 已提交
1928 1929
		struct nat_entry *ne;
		struct f2fs_nat_entry raw_ne;
1930
		nid_t nid = le32_to_cpu(nid_in_journal(journal, i));
J
Jaegeuk Kim 已提交
1931

1932
		raw_ne = nat_in_journal(journal, i);
1933

J
Jaegeuk Kim 已提交
1934 1935
		ne = __lookup_nat_cache(nm_i, nid);
		if (!ne) {
1936 1937
			ne = grab_nat_entry(nm_i, nid);
			node_info_from_raw_nat(&ne->ni, &raw_ne);
J
Jaegeuk Kim 已提交
1938 1939 1940
		}
		__set_nat_cache_dirty(nm_i, ne);
	}
1941
	update_nats_in_cursum(journal, -i);
1942
	up_write(&curseg->journal_rwsem);
J
Jaegeuk Kim 已提交
1943 1944
}

1945 1946
static void __adjust_nat_entry_set(struct nat_entry_set *nes,
						struct list_head *head, int max)
J
Jaegeuk Kim 已提交
1947
{
1948
	struct nat_entry_set *cur;
J
Jaegeuk Kim 已提交
1949

1950 1951
	if (nes->entry_cnt >= max)
		goto add_out;
J
Jaegeuk Kim 已提交
1952

1953 1954 1955 1956 1957
	list_for_each_entry(cur, head, set_list) {
		if (cur->entry_cnt >= nes->entry_cnt) {
			list_add(&nes->set_list, cur->set_list.prev);
			return;
		}
1958
	}
1959 1960 1961
add_out:
	list_add_tail(&nes->set_list, head);
}
J
Jaegeuk Kim 已提交
1962

1963 1964 1965 1966
static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
					struct nat_entry_set *set)
{
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1967
	struct f2fs_journal *journal = curseg->journal;
1968 1969 1970 1971 1972
	nid_t start_nid = set->set * NAT_ENTRY_PER_BLOCK;
	bool to_journal = true;
	struct f2fs_nat_block *nat_blk;
	struct nat_entry *ne, *cur;
	struct page *page = NULL;
J
Jaegeuk Kim 已提交
1973

1974 1975 1976 1977 1978
	/*
	 * there are two steps to flush nat entries:
	 * #1, flush nat entries to journal in current hot data summary block.
	 * #2, flush nat entries to nat page.
	 */
1979
	if (!__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL))
1980 1981 1982
		to_journal = false;

	if (to_journal) {
1983
		down_write(&curseg->journal_rwsem);
1984 1985 1986 1987 1988
	} else {
		page = get_next_nat_page(sbi, start_nid);
		nat_blk = page_address(page);
		f2fs_bug_on(sbi, !nat_blk);
	}
1989

1990 1991 1992 1993 1994 1995 1996 1997
	/* flush dirty nats in nat entry set */
	list_for_each_entry_safe(ne, cur, &set->entry_list, list) {
		struct f2fs_nat_entry *raw_ne;
		nid_t nid = nat_get_nid(ne);
		int offset;

		if (nat_get_blkaddr(ne) == NEW_ADDR)
			continue;
1998 1999

		if (to_journal) {
2000
			offset = lookup_journal_in_cursum(journal,
2001 2002
							NAT_JOURNAL, nid, 1);
			f2fs_bug_on(sbi, offset < 0);
2003 2004
			raw_ne = &nat_in_journal(journal, offset);
			nid_in_journal(journal, offset) = cpu_to_le32(nid);
2005
		} else {
2006
			raw_ne = &nat_blk->entries[nid - start_nid];
J
Jaegeuk Kim 已提交
2007
		}
2008 2009 2010 2011 2012 2013
		raw_nat_from_node_info(raw_ne, &ne->ni);
		nat_reset_flag(ne);
		__clear_nat_cache_dirty(NM_I(sbi), ne);
		if (nat_get_blkaddr(ne) == NULL_ADDR)
			add_free_nid(sbi, nid, false);
	}
J
Jaegeuk Kim 已提交
2014

2015
	if (to_journal)
2016
		up_write(&curseg->journal_rwsem);
2017 2018
	else
		f2fs_put_page(page, 1);
2019

2020 2021 2022 2023
	f2fs_bug_on(sbi, set->entry_cnt);

	radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set);
	kmem_cache_free(nat_entry_set_slab, set);
2024
}
2025

2026 2027 2028 2029 2030 2031 2032
/*
 * This function is called during the checkpointing process.
 */
void flush_nat_entries(struct f2fs_sb_info *sbi)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
2033
	struct f2fs_journal *journal = curseg->journal;
2034
	struct nat_entry_set *setvec[SETVEC_SIZE];
2035 2036 2037 2038 2039
	struct nat_entry_set *set, *tmp;
	unsigned int found;
	nid_t set_idx = 0;
	LIST_HEAD(sets);

2040 2041
	if (!nm_i->dirty_nat_cnt)
		return;
2042 2043 2044

	down_write(&nm_i->nat_tree_lock);

2045 2046 2047 2048 2049
	/*
	 * if there are no enough space in journal to store dirty nat
	 * entries, remove all entries from journal and merge them
	 * into nat entry set.
	 */
2050
	if (!__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
2051 2052 2053
		remove_nats_in_journal(sbi);

	while ((found = __gang_lookup_nat_set(nm_i,
2054
					set_idx, SETVEC_SIZE, setvec))) {
2055 2056 2057 2058
		unsigned idx;
		set_idx = setvec[found - 1]->set + 1;
		for (idx = 0; idx < found; idx++)
			__adjust_nat_entry_set(setvec[idx], &sets,
2059
						MAX_NAT_JENTRIES(journal));
J
Jaegeuk Kim 已提交
2060
	}
2061

2062 2063 2064 2065
	/* flush dirty nats in nat entry set */
	list_for_each_entry_safe(set, tmp, &sets, set_list)
		__flush_nat_entry_set(sbi, set);

2066 2067
	up_write(&nm_i->nat_tree_lock);

2068
	f2fs_bug_on(sbi, nm_i->dirty_nat_cnt);
J
Jaegeuk Kim 已提交
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
}

static int init_node_manager(struct f2fs_sb_info *sbi)
{
	struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	unsigned char *version_bitmap;
	unsigned int nat_segs, nat_blocks;

	nm_i->nat_blkaddr = le32_to_cpu(sb_raw->nat_blkaddr);

	/* segment_count_nat includes pair segment so divide to 2. */
	nat_segs = le32_to_cpu(sb_raw->segment_count_nat) >> 1;
	nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
2083

2084 2085
	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;

2086
	/* not used nids: 0, node, meta, (and root counted as valid node) */
2087
	nm_i->available_nids = nm_i->max_nid - F2FS_RESERVED_NODE_NUM;
J
Jaegeuk Kim 已提交
2088 2089
	nm_i->fcnt = 0;
	nm_i->nat_cnt = 0;
2090
	nm_i->ram_thresh = DEF_RAM_THRESHOLD;
C
Chao Yu 已提交
2091
	nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
C
Chao Yu 已提交
2092
	nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
J
Jaegeuk Kim 已提交
2093

2094
	INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
J
Jaegeuk Kim 已提交
2095
	INIT_LIST_HEAD(&nm_i->free_nid_list);
2096 2097
	INIT_RADIX_TREE(&nm_i->nat_root, GFP_NOIO);
	INIT_RADIX_TREE(&nm_i->nat_set_root, GFP_NOIO);
J
Jaegeuk Kim 已提交
2098 2099 2100 2101
	INIT_LIST_HEAD(&nm_i->nat_entries);

	mutex_init(&nm_i->build_lock);
	spin_lock_init(&nm_i->free_nid_list_lock);
2102
	init_rwsem(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2103 2104

	nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
A
Alexandru Gheorghiu 已提交
2105
	nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
J
Jaegeuk Kim 已提交
2106 2107 2108 2109
	version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
	if (!version_bitmap)
		return -EFAULT;

A
Alexandru Gheorghiu 已提交
2110 2111 2112 2113
	nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
					GFP_KERNEL);
	if (!nm_i->nat_bitmap)
		return -ENOMEM;
J
Jaegeuk Kim 已提交
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
	return 0;
}

int build_node_manager(struct f2fs_sb_info *sbi)
{
	int err;

	sbi->nm_info = kzalloc(sizeof(struct f2fs_nm_info), GFP_KERNEL);
	if (!sbi->nm_info)
		return -ENOMEM;

	err = init_node_manager(sbi);
	if (err)
		return err;

	build_free_nids(sbi);
	return 0;
}

void destroy_node_manager(struct f2fs_sb_info *sbi)
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i, *next_i;
	struct nat_entry *natvec[NATVEC_SIZE];
2138
	struct nat_entry_set *setvec[SETVEC_SIZE];
J
Jaegeuk Kim 已提交
2139 2140 2141 2142 2143 2144 2145 2146 2147
	nid_t nid = 0;
	unsigned int found;

	if (!nm_i)
		return;

	/* destroy free nid list */
	spin_lock(&nm_i->free_nid_list_lock);
	list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
2148
		f2fs_bug_on(sbi, i->state == NID_ALLOC);
2149
		__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
2150
		nm_i->fcnt--;
2151 2152 2153
		spin_unlock(&nm_i->free_nid_list_lock);
		kmem_cache_free(free_nid_slab, i);
		spin_lock(&nm_i->free_nid_list_lock);
J
Jaegeuk Kim 已提交
2154
	}
2155
	f2fs_bug_on(sbi, nm_i->fcnt);
J
Jaegeuk Kim 已提交
2156 2157 2158
	spin_unlock(&nm_i->free_nid_list_lock);

	/* destroy nat cache */
2159
	down_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2160 2161 2162
	while ((found = __gang_lookup_nat_cache(nm_i,
					nid, NATVEC_SIZE, natvec))) {
		unsigned idx;
2163

2164 2165 2166
		nid = nat_get_nid(natvec[found - 1]) + 1;
		for (idx = 0; idx < found; idx++)
			__del_from_nat_cache(nm_i, natvec[idx]);
J
Jaegeuk Kim 已提交
2167
	}
2168
	f2fs_bug_on(sbi, nm_i->nat_cnt);
2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183

	/* destroy nat set cache */
	nid = 0;
	while ((found = __gang_lookup_nat_set(nm_i,
					nid, SETVEC_SIZE, setvec))) {
		unsigned idx;

		nid = setvec[found - 1]->set + 1;
		for (idx = 0; idx < found; idx++) {
			/* entry_cnt is not zero, when cp_error was occurred */
			f2fs_bug_on(sbi, !list_empty(&setvec[idx]->entry_list));
			radix_tree_delete(&nm_i->nat_set_root, setvec[idx]->set);
			kmem_cache_free(nat_entry_set_slab, setvec[idx]);
		}
	}
2184
	up_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2185 2186 2187 2188 2189 2190

	kfree(nm_i->nat_bitmap);
	sbi->nm_info = NULL;
	kfree(nm_i);
}

2191
int __init create_node_manager_caches(void)
J
Jaegeuk Kim 已提交
2192 2193
{
	nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
2194
			sizeof(struct nat_entry));
J
Jaegeuk Kim 已提交
2195
	if (!nat_entry_slab)
2196
		goto fail;
J
Jaegeuk Kim 已提交
2197 2198

	free_nid_slab = f2fs_kmem_cache_create("free_nid",
2199
			sizeof(struct free_nid));
2200
	if (!free_nid_slab)
2201
		goto destroy_nat_entry;
2202 2203 2204 2205

	nat_entry_set_slab = f2fs_kmem_cache_create("nat_entry_set",
			sizeof(struct nat_entry_set));
	if (!nat_entry_set_slab)
2206
		goto destroy_free_nid;
J
Jaegeuk Kim 已提交
2207
	return 0;
2208

2209
destroy_free_nid:
2210
	kmem_cache_destroy(free_nid_slab);
2211
destroy_nat_entry:
2212 2213 2214
	kmem_cache_destroy(nat_entry_slab);
fail:
	return -ENOMEM;
J
Jaegeuk Kim 已提交
2215 2216 2217 2218
}

void destroy_node_manager_caches(void)
{
2219
	kmem_cache_destroy(nat_entry_set_slab);
J
Jaegeuk Kim 已提交
2220 2221 2222
	kmem_cache_destroy(free_nid_slab);
	kmem_cache_destroy(nat_entry_slab);
}