node.c 51.4 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)
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			return false;
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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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	down_write(&nm_i->nat_tree_lock);
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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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	}
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	up_write(&nm_i->nat_tree_lock);
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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);
	struct f2fs_summary_block *sum = curseg->sum_blk;
	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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	/* Check current segment summary */
	mutex_lock(&curseg->curseg_mutex);
	i = lookup_journal_in_cursum(sum, NAT_JOURNAL, nid, 0);
	if (i >= 0) {
		ne = nat_in_journal(sum, i);
		node_info_from_raw_nat(ni, &ne);
	}
	mutex_unlock(&curseg->curseg_mutex);
	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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/*
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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 f2fs_inode_info *fi, long block,
				int offset[4], unsigned int noffset[4])
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{
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	const long direct_index = ADDRS_PER_INODE(fi);
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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).
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 * 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.
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 * In the case of RDONLY_NODE, we don't need to care about mutex.
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 */
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int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
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{
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	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
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	struct page *npage[4];
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	struct page *parent = NULL;
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	int offset[4];
	unsigned int noffset[4];
	nid_t nids[4];
	int level, i;
	int err = 0;

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	level = get_node_path(F2FS_I(dn->inode), index, offset, noffset);
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	nids[0] = dn->inode->i_ino;
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	npage[0] = dn->inode_page;
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505 506 507 508 509
	if (!npage[0]) {
		npage[0] = get_node_page(sbi, nids[0]);
		if (IS_ERR(npage[0]))
			return PTR_ERR(npage[0]);
	}
510 511 512

	/* if inline_data is set, should not report any block indices */
	if (f2fs_has_inline_data(dn->inode) && index) {
513
		err = -ENOENT;
514 515 516 517
		f2fs_put_page(npage[0], 1);
		goto release_out;
	}

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Jaegeuk Kim 已提交
518
	parent = npage[0];
519 520
	if (level != 0)
		nids[1] = get_nid(parent, offset[0], true);
J
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521 522 523 524 525 526 527
	dn->inode_page = npage[0];
	dn->inode_page_locked = true;

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

528
		if (!nids[i] && mode == ALLOC_NODE) {
J
Jaegeuk Kim 已提交
529 530 531 532 533 534 535
			/* alloc new node */
			if (!alloc_nid(sbi, &(nids[i]))) {
				err = -ENOSPC;
				goto release_pages;
			}

			dn->nid = nids[i];
536
			npage[i] = new_node_page(dn, noffset[i], NULL);
J
Jaegeuk Kim 已提交
537 538 539 540 541 542 543 544
			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]);
545
			dn->node_changed = true;
J
Jaegeuk Kim 已提交
546
			done = true;
547
		} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
J
Jaegeuk Kim 已提交
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
			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;
	return err;
}

static void truncate_node(struct dnode_of_data *dn)
{
593
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
J
Jaegeuk Kim 已提交
594 595 596
	struct node_info ni;

	get_node_info(sbi, dn->nid, &ni);
597
	if (dn->inode->i_blocks == 0) {
598
		f2fs_bug_on(sbi, ni.blk_addr != NULL_ADDR);
599 600
		goto invalidate;
	}
601
	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
J
Jaegeuk Kim 已提交
602 603

	/* Deallocate node address */
604
	invalidate_blocks(sbi, ni.blk_addr);
605
	dec_valid_node_count(sbi, dn->inode);
606
	set_node_addr(sbi, &ni, NULL_ADDR, false);
J
Jaegeuk Kim 已提交
607 608 609 610 611 612 613

	if (dn->nid == dn->inode->i_ino) {
		remove_orphan_inode(sbi, dn->nid);
		dec_valid_inode_count(sbi);
	} else {
		sync_inode_page(dn);
	}
614
invalidate:
J
Jaegeuk Kim 已提交
615
	clear_node_page_dirty(dn->node_page);
616
	set_sbi_flag(sbi, SBI_IS_DIRTY);
J
Jaegeuk Kim 已提交
617 618

	f2fs_put_page(dn->node_page, 1);
619 620 621 622

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

J
Jaegeuk Kim 已提交
623
	dn->node_page = NULL;
624
	trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
J
Jaegeuk Kim 已提交
625 626 627 628 629 630 631 632 633 634
}

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

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

	/* get direct node */
635
	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
J
Jaegeuk Kim 已提交
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
	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;

663 664
	trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);

665
	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
666 667
	if (IS_ERR(page)) {
		trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
J
Jaegeuk Kim 已提交
668
		return PTR_ERR(page);
669
	}
J
Jaegeuk Kim 已提交
670

671
	rn = F2FS_NODE(page);
J
Jaegeuk Kim 已提交
672 673 674 675 676 677 678 679 680 681
	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;
			set_nid(page, i, 0, false);
682
			dn->node_changed = true;
J
Jaegeuk Kim 已提交
683 684 685 686 687 688 689 690 691 692 693 694 695
		}
	} 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)) {
				set_nid(page, i, 0, false);
696
				dn->node_changed = true;
J
Jaegeuk Kim 已提交
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
				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);
	}
713
	trace_f2fs_truncate_nodes_exit(dn->inode, freed);
J
Jaegeuk Kim 已提交
714 715 716 717
	return freed;

out_err:
	f2fs_put_page(page, 1);
718
	trace_f2fs_truncate_nodes_exit(dn->inode, ret);
J
Jaegeuk Kim 已提交
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
	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 */
737
	for (i = 0; i < idx + 1; i++) {
A
arter97 已提交
738
		/* reference count'll be increased */
739
		pages[i] = get_node_page(F2FS_I_SB(dn->inode), nid[i]);
J
Jaegeuk Kim 已提交
740 741
		if (IS_ERR(pages[i])) {
			err = PTR_ERR(pages[i]);
742
			idx = i - 1;
J
Jaegeuk Kim 已提交
743 744 745 746 747 748
			goto fail;
		}
		nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
	}

	/* free direct nodes linked to a partial indirect node */
749
	for (i = offset[idx + 1]; i < NIDS_PER_BLOCK; i++) {
J
Jaegeuk Kim 已提交
750 751 752 753 754 755 756 757
		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;
		set_nid(pages[idx], i, 0, false);
758
		dn->node_changed = true;
J
Jaegeuk Kim 已提交
759 760
	}

761
	if (offset[idx + 1] == 0) {
J
Jaegeuk Kim 已提交
762 763 764 765 766 767 768
		dn->node_page = pages[idx];
		dn->nid = nid[idx];
		truncate_node(dn);
	} else {
		f2fs_put_page(pages[idx], 1);
	}
	offset[idx]++;
769 770
	offset[idx + 1] = 0;
	idx--;
J
Jaegeuk Kim 已提交
771
fail:
772
	for (i = idx; i >= 0; i--)
J
Jaegeuk Kim 已提交
773
		f2fs_put_page(pages[i], 1);
774 775 776

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

J
Jaegeuk Kim 已提交
777 778 779
	return err;
}

J
Jaegeuk Kim 已提交
780
/*
J
Jaegeuk Kim 已提交
781 782 783 784
 * All the block addresses of data and nodes should be nullified.
 */
int truncate_inode_blocks(struct inode *inode, pgoff_t from)
{
785
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
J
Jaegeuk Kim 已提交
786 787
	int err = 0, cont = 1;
	int level, offset[4], noffset[4];
J
Jaegeuk Kim 已提交
788
	unsigned int nofs = 0;
789
	struct f2fs_inode *ri;
J
Jaegeuk Kim 已提交
790 791 792
	struct dnode_of_data dn;
	struct page *page;

793 794
	trace_f2fs_truncate_inode_blocks_enter(inode, from);

795
	level = get_node_path(F2FS_I(inode), from, offset, noffset);
796
restart:
J
Jaegeuk Kim 已提交
797
	page = get_node_page(sbi, inode->i_ino);
798 799
	if (IS_ERR(page)) {
		trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
J
Jaegeuk Kim 已提交
800
		return PTR_ERR(page);
801
	}
J
Jaegeuk Kim 已提交
802 803 804 805

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

806
	ri = F2FS_INODE(page);
J
Jaegeuk Kim 已提交
807 808 809 810 811 812 813 814 815
	switch (level) {
	case 0:
	case 1:
		nofs = noffset[1];
		break;
	case 2:
		nofs = noffset[1];
		if (!offset[level - 1])
			goto skip_partial;
816
		err = truncate_partial_nodes(&dn, ri, offset, level);
J
Jaegeuk Kim 已提交
817 818 819 820 821 822 823 824
		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;
825
		err = truncate_partial_nodes(&dn, ri, offset, level);
J
Jaegeuk Kim 已提交
826 827 828 829 830 831 832 833 834
		if (err < 0 && err != -ENOENT)
			goto fail;
		break;
	default:
		BUG();
	}

skip_partial:
	while (cont) {
835
		dn.nid = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
J
Jaegeuk Kim 已提交
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
		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 &&
858
				ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {
J
Jaegeuk Kim 已提交
859
			lock_page(page);
860
			if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
861 862 863
				f2fs_put_page(page, 1);
				goto restart;
			}
864
			f2fs_wait_on_page_writeback(page, NODE);
865
			ri->i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
J
Jaegeuk Kim 已提交
866 867 868 869 870 871 872 873 874
			set_page_dirty(page);
			unlock_page(page);
		}
		offset[1] = 0;
		offset[0]++;
		nofs += err;
	}
fail:
	f2fs_put_page(page, 0);
875
	trace_f2fs_truncate_inode_blocks_exit(inode, err);
J
Jaegeuk Kim 已提交
876 877 878
	return err > 0 ? 0 : err;
}

879 880
int truncate_xattr_node(struct inode *inode, struct page *page)
{
881
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
882 883 884 885 886 887 888 889 890 891 892 893
	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
894 895 896 897

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

898 899 900
	set_new_dnode(&dn, inode, page, npage, nid);

	if (page)
901
		dn.inode_page_locked = true;
902 903 904 905
	truncate_node(&dn);
	return 0;
}

906
/*
C
Chao Yu 已提交
907 908
 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
 * f2fs_unlock_op().
909
 */
C
Chao Yu 已提交
910
int remove_inode_page(struct inode *inode)
J
Jaegeuk Kim 已提交
911 912
{
	struct dnode_of_data dn;
C
Chao Yu 已提交
913
	int err;
J
Jaegeuk Kim 已提交
914

915
	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
C
Chao Yu 已提交
916 917 918
	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	if (err)
		return err;
J
Jaegeuk Kim 已提交
919

C
Chao Yu 已提交
920 921
	err = truncate_xattr_node(inode, dn.inode_page);
	if (err) {
922
		f2fs_put_dnode(&dn);
C
Chao Yu 已提交
923
		return err;
J
Jaegeuk Kim 已提交
924
	}
925 926 927 928 929 930

	/* 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
931
	/* 0 is possible, after f2fs_new_inode() has failed */
932 933
	f2fs_bug_on(F2FS_I_SB(inode),
			inode->i_blocks != 0 && inode->i_blocks != 1);
934 935

	/* will put inode & node pages */
936
	truncate_node(&dn);
C
Chao Yu 已提交
937
	return 0;
J
Jaegeuk Kim 已提交
938 939
}

940
struct page *new_inode_page(struct inode *inode)
J
Jaegeuk Kim 已提交
941 942 943 944 945
{
	struct dnode_of_data dn;

	/* allocate inode page for new inode */
	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
946 947

	/* caller should f2fs_put_page(page, 1); */
948
	return new_node_page(&dn, 0, NULL);
J
Jaegeuk Kim 已提交
949 950
}

951 952
struct page *new_node_page(struct dnode_of_data *dn,
				unsigned int ofs, struct page *ipage)
J
Jaegeuk Kim 已提交
953
{
954
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
J
Jaegeuk Kim 已提交
955 956 957 958
	struct node_info old_ni, new_ni;
	struct page *page;
	int err;

959
	if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
J
Jaegeuk Kim 已提交
960 961
		return ERR_PTR(-EPERM);

962
	page = grab_cache_page(NODE_MAPPING(sbi), dn->nid);
J
Jaegeuk Kim 已提交
963 964 965
	if (!page)
		return ERR_PTR(-ENOMEM);

966
	if (unlikely(!inc_valid_node_count(sbi, dn->inode))) {
967 968 969
		err = -ENOSPC;
		goto fail;
	}
J
Jaegeuk Kim 已提交
970

971
	get_node_info(sbi, dn->nid, &old_ni);
J
Jaegeuk Kim 已提交
972 973

	/* Reinitialize old_ni with new node page */
974
	f2fs_bug_on(sbi, old_ni.blk_addr != NULL_ADDR);
J
Jaegeuk Kim 已提交
975 976
	new_ni = old_ni;
	new_ni.ino = dn->inode->i_ino;
977
	set_node_addr(sbi, &new_ni, NEW_ADDR, false);
978

979
	f2fs_wait_on_page_writeback(page, NODE);
980
	fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
981
	set_cold_node(dn->inode, page);
982 983
	SetPageUptodate(page);
	set_page_dirty(page);
J
Jaegeuk Kim 已提交
984

985
	if (f2fs_has_xattr_block(ofs))
986 987
		F2FS_I(dn->inode)->i_xattr_nid = dn->nid;

J
Jaegeuk Kim 已提交
988
	dn->node_page = page;
989 990 991 992
	if (ipage)
		update_inode(dn->inode, ipage);
	else
		sync_inode_page(dn);
J
Jaegeuk Kim 已提交
993 994 995 996 997 998
	if (ofs == 0)
		inc_valid_inode_count(sbi);

	return page;

fail:
999
	clear_node_page_dirty(page);
J
Jaegeuk Kim 已提交
1000 1001 1002 1003
	f2fs_put_page(page, 1);
	return ERR_PTR(err);
}

1004 1005 1006
/*
 * Caller should do after getting the following values.
 * 0: f2fs_put_page(page, 0)
1007
 * LOCKED_PAGE or error: f2fs_put_page(page, 1)
1008
 */
1009
static int read_node_page(struct page *page, int rw)
J
Jaegeuk Kim 已提交
1010
{
1011
	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
J
Jaegeuk Kim 已提交
1012
	struct node_info ni;
1013
	struct f2fs_io_info fio = {
1014
		.sbi = sbi,
1015 1016
		.type = NODE,
		.rw = rw,
1017
		.page = page,
1018
		.encrypted_page = NULL,
1019
	};
J
Jaegeuk Kim 已提交
1020 1021 1022

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

1023
	if (unlikely(ni.blk_addr == NULL_ADDR)) {
1024
		ClearPageUptodate(page);
J
Jaegeuk Kim 已提交
1025
		return -ENOENT;
1026 1027
	}

1028 1029
	if (PageUptodate(page))
		return LOCKED_PAGE;
1030

1031
	fio.blk_addr = ni.blk_addr;
1032
	return f2fs_submit_page_bio(&fio);
J
Jaegeuk Kim 已提交
1033 1034
}

J
Jaegeuk Kim 已提交
1035
/*
J
Jaegeuk Kim 已提交
1036 1037 1038 1039 1040
 * Readahead a node page
 */
void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
{
	struct page *apage;
1041
	int err;
J
Jaegeuk Kim 已提交
1042

1043
	apage = find_get_page(NODE_MAPPING(sbi), nid);
1044 1045 1046 1047
	if (apage && PageUptodate(apage)) {
		f2fs_put_page(apage, 0);
		return;
	}
J
Jaegeuk Kim 已提交
1048 1049
	f2fs_put_page(apage, 0);

1050
	apage = grab_cache_page(NODE_MAPPING(sbi), nid);
J
Jaegeuk Kim 已提交
1051 1052 1053
	if (!apage)
		return;

1054
	err = read_node_page(apage, READA);
1055
	f2fs_put_page(apage, err ? 1 : 0);
J
Jaegeuk Kim 已提交
1056 1057 1058 1059
}

struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
{
1060 1061
	struct page *page;
	int err;
1062
repeat:
1063
	page = grab_cache_page(NODE_MAPPING(sbi), nid);
J
Jaegeuk Kim 已提交
1064 1065 1066 1067
	if (!page)
		return ERR_PTR(-ENOMEM);

	err = read_node_page(page, READ_SYNC);
1068 1069
	if (err < 0) {
		f2fs_put_page(page, 1);
J
Jaegeuk Kim 已提交
1070
		return ERR_PTR(err);
C
Chao Yu 已提交
1071 1072
	} else if (err == LOCKED_PAGE) {
		goto page_hit;
1073
	}
J
Jaegeuk Kim 已提交
1074

C
Chao Yu 已提交
1075 1076 1077
	lock_page(page);

	if (unlikely(!PageUptodate(page))) {
1078 1079 1080
		f2fs_put_page(page, 1);
		return ERR_PTR(-EIO);
	}
1081
	if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1082 1083 1084
		f2fs_put_page(page, 1);
		goto repeat;
	}
C
Chao Yu 已提交
1085 1086
page_hit:
	f2fs_bug_on(sbi, nid != nid_of_node(page));
J
Jaegeuk Kim 已提交
1087 1088 1089
	return page;
}

J
Jaegeuk Kim 已提交
1090
/*
J
Jaegeuk Kim 已提交
1091 1092 1093 1094 1095
 * Return a locked page for the desired node page.
 * And, readahead MAX_RA_NODE number of node pages.
 */
struct page *get_node_page_ra(struct page *parent, int start)
{
1096
	struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
1097
	struct blk_plug plug;
J
Jaegeuk Kim 已提交
1098
	struct page *page;
1099 1100
	int err, i, end;
	nid_t nid;
J
Jaegeuk Kim 已提交
1101 1102 1103 1104 1105

	/* First, try getting the desired direct node. */
	nid = get_nid(parent, start, false);
	if (!nid)
		return ERR_PTR(-ENOENT);
1106
repeat:
1107
	page = grab_cache_page(NODE_MAPPING(sbi), nid);
J
Jaegeuk Kim 已提交
1108 1109 1110
	if (!page)
		return ERR_PTR(-ENOMEM);

1111
	err = read_node_page(page, READ_SYNC);
1112 1113
	if (err < 0) {
		f2fs_put_page(page, 1);
J
Jaegeuk Kim 已提交
1114
		return ERR_PTR(err);
1115
	} else if (err == LOCKED_PAGE) {
1116
		goto page_hit;
1117
	}
J
Jaegeuk Kim 已提交
1118

1119 1120
	blk_start_plug(&plug);

J
Jaegeuk Kim 已提交
1121 1122 1123 1124
	/* Then, try readahead for siblings of the desired node */
	end = start + MAX_RA_NODE;
	end = min(end, NIDS_PER_BLOCK);
	for (i = start + 1; i < end; i++) {
C
Chao Yu 已提交
1125 1126
		nid_t tnid = get_nid(parent, i, false);
		if (!tnid)
J
Jaegeuk Kim 已提交
1127
			continue;
C
Chao Yu 已提交
1128
		ra_node_page(sbi, tnid);
J
Jaegeuk Kim 已提交
1129 1130
	}

1131 1132
	blk_finish_plug(&plug);

J
Jaegeuk Kim 已提交
1133
	lock_page(page);
C
Chao Yu 已提交
1134 1135 1136 1137
	if (unlikely(!PageUptodate(page))) {
		f2fs_put_page(page, 1);
		return ERR_PTR(-EIO);
	}
1138
	if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1139 1140 1141
		f2fs_put_page(page, 1);
		goto repeat;
	}
1142
page_hit:
C
Chao Yu 已提交
1143
	f2fs_bug_on(sbi, nid != nid_of_node(page));
J
Jaegeuk Kim 已提交
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
	return page;
}

void sync_inode_page(struct dnode_of_data *dn)
{
	if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
		update_inode(dn->inode, dn->node_page);
	} else if (dn->inode_page) {
		if (!dn->inode_page_locked)
			lock_page(dn->inode_page);
		update_inode(dn->inode, dn->inode_page);
		if (!dn->inode_page_locked)
			unlock_page(dn->inode_page);
	} else {
1158
		update_inode_page(dn->inode);
J
Jaegeuk Kim 已提交
1159
	}
1160
	dn->node_changed = true;
J
Jaegeuk Kim 已提交
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
}

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;
1179
		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
J
Jaegeuk Kim 已提交
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
				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];

			/*
			 * 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;

1212
			if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
J
Jaegeuk Kim 已提交
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
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;
			}

			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
1231 1232 1233
				if (IS_INODE(page))
					set_dentry_mark(page,
						need_dentry_mark(sbi, ino));
J
Jaegeuk Kim 已提交
1234 1235 1236 1237 1238
				nwritten++;
			} else {
				set_fsync_mark(page, 0);
				set_dentry_mark(page, 0);
			}
1239 1240 1241 1242 1243

			if (NODE_MAPPING(sbi)->a_ops->writepage(page, wbc))
				unlock_page(page);
			else
				wrote++;
J
Jaegeuk Kim 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262

			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;
	}

	if (wrote)
J
Jaegeuk Kim 已提交
1263
		f2fs_submit_merged_bio(sbi, NODE, WRITE);
J
Jaegeuk Kim 已提交
1264 1265 1266
	return nwritten;
}

1267 1268 1269 1270 1271 1272 1273
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);
1274 1275 1276 1277 1278 1279 1280 1281

	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;
1282 1283 1284 1285 1286

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

			/* until radix tree lookup accepts end_index */
1287
			if (unlikely(page->index > end))
1288 1289
				continue;

1290
			if (ino && ino_of_node(page) == ino) {
1291
				f2fs_wait_on_page_writeback(page, NODE);
1292 1293 1294
				if (TestClearPageError(page))
					ret = -EIO;
			}
1295 1296 1297 1298 1299
		}
		pagevec_release(&pvec);
		cond_resched();
	}

1300
	if (unlikely(test_and_clear_bit(AS_ENOSPC, &NODE_MAPPING(sbi)->flags)))
1301
		ret2 = -ENOSPC;
1302
	if (unlikely(test_and_clear_bit(AS_EIO, &NODE_MAPPING(sbi)->flags)))
1303 1304 1305 1306 1307 1308
		ret2 = -EIO;
	if (!ret)
		ret = ret2;
	return ret;
}

J
Jaegeuk Kim 已提交
1309 1310 1311
static int f2fs_write_node_page(struct page *page,
				struct writeback_control *wbc)
{
1312
	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
J
Jaegeuk Kim 已提交
1313 1314
	nid_t nid;
	struct node_info ni;
1315
	struct f2fs_io_info fio = {
1316
		.sbi = sbi,
1317
		.type = NODE,
C
Chris Fries 已提交
1318
		.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
1319
		.page = page,
1320
		.encrypted_page = NULL,
1321
	};
J
Jaegeuk Kim 已提交
1322

1323 1324
	trace_f2fs_writepage(page, NODE);

1325
	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1326
		goto redirty_out;
1327 1328
	if (unlikely(f2fs_cp_error(sbi)))
		goto redirty_out;
1329

1330
	f2fs_wait_on_page_writeback(page, NODE);
J
Jaegeuk Kim 已提交
1331 1332 1333

	/* get old block addr of this node page */
	nid = nid_of_node(page);
1334
	f2fs_bug_on(sbi, page->index != nid);
J
Jaegeuk Kim 已提交
1335

1336 1337 1338 1339 1340 1341 1342
	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
1343 1344 1345
	get_node_info(sbi, nid, &ni);

	/* This page is already truncated */
1346
	if (unlikely(ni.blk_addr == NULL_ADDR)) {
1347
		ClearPageUptodate(page);
1348
		dec_page_count(sbi, F2FS_DIRTY_NODES);
1349
		up_read(&sbi->node_write);
1350 1351 1352
		unlock_page(page);
		return 0;
	}
J
Jaegeuk Kim 已提交
1353 1354

	set_page_writeback(page);
1355
	fio.blk_addr = ni.blk_addr;
1356
	write_node_page(nid, &fio);
1357
	set_node_addr(sbi, &ni, fio.blk_addr, is_fsync_dnode(page));
J
Jaegeuk Kim 已提交
1358
	dec_page_count(sbi, F2FS_DIRTY_NODES);
1359
	up_read(&sbi->node_write);
J
Jaegeuk Kim 已提交
1360
	unlock_page(page);
1361 1362 1363 1364

	if (wbc->for_reclaim)
		f2fs_submit_merged_bio(sbi, NODE, WRITE);

J
Jaegeuk Kim 已提交
1365
	return 0;
1366 1367

redirty_out:
1368
	redirty_page_for_writepage(wbc, page);
1369
	return AOP_WRITEPAGE_ACTIVATE;
J
Jaegeuk Kim 已提交
1370 1371 1372 1373 1374
}

static int f2fs_write_node_pages(struct address_space *mapping,
			    struct writeback_control *wbc)
{
1375
	struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1376
	long diff;
J
Jaegeuk Kim 已提交
1377

1378 1379
	trace_f2fs_writepages(mapping->host, wbc, NODE);

1380 1381
	/* balancing f2fs's metadata in background */
	f2fs_balance_fs_bg(sbi);
J
Jaegeuk Kim 已提交
1382

1383
	/* collect a number of dirty node pages and write together */
1384
	if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
1385
		goto skip_write;
1386

1387
	diff = nr_pages_to_write(sbi, NODE, wbc);
1388
	wbc->sync_mode = WB_SYNC_NONE;
J
Jaegeuk Kim 已提交
1389
	sync_node_pages(sbi, 0, wbc);
1390
	wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
J
Jaegeuk Kim 已提交
1391
	return 0;
1392 1393 1394 1395

skip_write:
	wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_NODES);
	return 0;
J
Jaegeuk Kim 已提交
1396 1397 1398 1399
}

static int f2fs_set_node_page_dirty(struct page *page)
{
1400 1401
	trace_f2fs_set_page_dirty(page, NODE);

J
Jaegeuk Kim 已提交
1402 1403 1404
	SetPageUptodate(page);
	if (!PageDirty(page)) {
		__set_page_dirty_nobuffers(page);
1405
		inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_NODES);
J
Jaegeuk Kim 已提交
1406
		SetPagePrivate(page);
J
Jaegeuk Kim 已提交
1407
		f2fs_trace_pid(page);
J
Jaegeuk Kim 已提交
1408 1409 1410 1411 1412
		return 1;
	}
	return 0;
}

J
Jaegeuk Kim 已提交
1413
/*
J
Jaegeuk Kim 已提交
1414 1415 1416 1417 1418 1419
 * 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,
1420 1421
	.invalidatepage	= f2fs_invalidate_page,
	.releasepage	= f2fs_release_page,
J
Jaegeuk Kim 已提交
1422 1423
};

1424 1425
static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
						nid_t n)
J
Jaegeuk Kim 已提交
1426
{
1427
	return radix_tree_lookup(&nm_i->free_nid_root, n);
J
Jaegeuk Kim 已提交
1428 1429
}

1430 1431
static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
						struct free_nid *i)
J
Jaegeuk Kim 已提交
1432 1433
{
	list_del(&i->list);
1434
	radix_tree_delete(&nm_i->free_nid_root, i->nid);
J
Jaegeuk Kim 已提交
1435 1436
}

1437
static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
J
Jaegeuk Kim 已提交
1438
{
1439
	struct f2fs_nm_info *nm_i = NM_I(sbi);
J
Jaegeuk Kim 已提交
1440
	struct free_nid *i;
1441 1442
	struct nat_entry *ne;
	bool allocated = false;
J
Jaegeuk Kim 已提交
1443

1444
	if (!available_free_memory(sbi, FREE_NIDS))
H
Haicheng Li 已提交
1445
		return -1;
1446 1447

	/* 0 nid should not be used */
1448
	if (unlikely(nid == 0))
1449
		return 0;
1450

1451 1452
	if (build) {
		/* do not add allocated nids */
1453
		down_read(&nm_i->nat_tree_lock);
1454
		ne = __lookup_nat_cache(nm_i, nid);
1455
		if (ne &&
1456 1457
			(!get_nat_flag(ne, IS_CHECKPOINTED) ||
				nat_get_blkaddr(ne) != NULL_ADDR))
1458
			allocated = true;
1459
		up_read(&nm_i->nat_tree_lock);
1460 1461
		if (allocated)
			return 0;
J
Jaegeuk Kim 已提交
1462
	}
1463 1464

	i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
J
Jaegeuk Kim 已提交
1465 1466 1467
	i->nid = nid;
	i->state = NID_NEW;

1468 1469 1470 1471 1472
	if (radix_tree_preload(GFP_NOFS)) {
		kmem_cache_free(free_nid_slab, i);
		return 0;
	}

J
Jaegeuk Kim 已提交
1473
	spin_lock(&nm_i->free_nid_list_lock);
1474
	if (radix_tree_insert(&nm_i->free_nid_root, i->nid, i)) {
J
Jaegeuk Kim 已提交
1475
		spin_unlock(&nm_i->free_nid_list_lock);
1476
		radix_tree_preload_end();
J
Jaegeuk Kim 已提交
1477 1478 1479 1480 1481 1482
		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);
1483
	radix_tree_preload_end();
J
Jaegeuk Kim 已提交
1484 1485 1486 1487 1488 1489
	return 1;
}

static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
{
	struct free_nid *i;
1490 1491
	bool need_free = false;

J
Jaegeuk Kim 已提交
1492
	spin_lock(&nm_i->free_nid_list_lock);
1493
	i = __lookup_free_nid_list(nm_i, nid);
J
Jaegeuk Kim 已提交
1494
	if (i && i->state == NID_NEW) {
1495
		__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
1496
		nm_i->fcnt--;
1497
		need_free = true;
J
Jaegeuk Kim 已提交
1498 1499
	}
	spin_unlock(&nm_i->free_nid_list_lock);
1500 1501 1502

	if (need_free)
		kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1503 1504
}

1505
static void scan_nat_page(struct f2fs_sb_info *sbi,
J
Jaegeuk Kim 已提交
1506 1507
			struct page *nat_page, nid_t start_nid)
{
1508
	struct f2fs_nm_info *nm_i = NM_I(sbi);
J
Jaegeuk Kim 已提交
1509 1510 1511 1512 1513 1514 1515
	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
1516

1517
		if (unlikely(start_nid >= nm_i->max_nid))
J
Jaegeuk Kim 已提交
1518
			break;
H
Haicheng Li 已提交
1519 1520

		blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
1521
		f2fs_bug_on(sbi, blk_addr == NEW_ADDR);
H
Haicheng Li 已提交
1522
		if (blk_addr == NULL_ADDR) {
1523
			if (add_free_nid(sbi, start_nid, true) < 0)
H
Haicheng Li 已提交
1524 1525
				break;
		}
J
Jaegeuk Kim 已提交
1526 1527 1528 1529 1530 1531 1532 1533
	}
}

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);
	struct f2fs_summary_block *sum = curseg->sum_blk;
1534
	int i = 0;
1535
	nid_t nid = nm_i->next_scan_nid;
J
Jaegeuk Kim 已提交
1536

1537 1538 1539
	/* Enough entries */
	if (nm_i->fcnt > NAT_ENTRY_PER_BLOCK)
		return;
J
Jaegeuk Kim 已提交
1540

1541
	/* readahead nat pages to be scanned */
1542 1543
	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
							META_NAT, true);
J
Jaegeuk Kim 已提交
1544 1545 1546 1547

	while (1) {
		struct page *page = get_current_nat_page(sbi, nid);

1548
		scan_nat_page(sbi, page, nid);
J
Jaegeuk Kim 已提交
1549 1550 1551
		f2fs_put_page(page, 1);

		nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
1552
		if (unlikely(nid >= nm_i->max_nid))
J
Jaegeuk Kim 已提交
1553
			nid = 0;
1554

1555
		if (++i >= FREE_NID_PAGES)
J
Jaegeuk Kim 已提交
1556 1557 1558
			break;
	}

1559 1560
	/* go to the next free nat pages to find free nids abundantly */
	nm_i->next_scan_nid = nid;
J
Jaegeuk Kim 已提交
1561 1562 1563 1564 1565 1566 1567

	/* find free nids from current sum_pages */
	mutex_lock(&curseg->curseg_mutex);
	for (i = 0; i < nats_in_cursum(sum); i++) {
		block_t addr = le32_to_cpu(nat_in_journal(sum, i).block_addr);
		nid = le32_to_cpu(nid_in_journal(sum, i));
		if (addr == NULL_ADDR)
1568
			add_free_nid(sbi, nid, true);
J
Jaegeuk Kim 已提交
1569 1570 1571 1572
		else
			remove_free_nid(nm_i, nid);
	}
	mutex_unlock(&curseg->curseg_mutex);
C
Chao Yu 已提交
1573 1574

	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),
C
Chao Yu 已提交
1575
					nm_i->ra_nid_pages, META_NAT, false);
J
Jaegeuk Kim 已提交
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
}

/*
 * 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:
1588
	if (unlikely(sbi->total_valid_node_count + 1 > nm_i->available_nids))
1589
		return false;
J
Jaegeuk Kim 已提交
1590 1591 1592

	spin_lock(&nm_i->free_nid_list_lock);

1593
	/* We should not use stale free nids created by build_free_nids */
1594
	if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
1595 1596
		struct node_info ni;

1597
		f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
1598
		list_for_each_entry(i, &nm_i->free_nid_list, list)
1599 1600
			if (i->state == NID_NEW)
				break;
J
Jaegeuk Kim 已提交
1601

1602
		f2fs_bug_on(sbi, i->state != NID_NEW);
1603 1604 1605 1606
		*nid = i->nid;
		i->state = NID_ALLOC;
		nm_i->fcnt--;
		spin_unlock(&nm_i->free_nid_list_lock);
1607 1608 1609 1610 1611 1612 1613

		/* check nid is allocated already */
		get_node_info(sbi, *nid, &ni);
		if (ni.blk_addr != NULL_ADDR) {
			alloc_nid_done(sbi, *nid);
			goto retry;
		}
1614 1615
		return true;
	}
J
Jaegeuk Kim 已提交
1616
	spin_unlock(&nm_i->free_nid_list_lock);
1617 1618 1619 1620 1621 1622

	/* 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
1623 1624
}

J
Jaegeuk Kim 已提交
1625
/*
J
Jaegeuk Kim 已提交
1626 1627 1628 1629 1630 1631 1632 1633
 * 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);
1634
	i = __lookup_free_nid_list(nm_i, nid);
1635
	f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1636
	__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
1637
	spin_unlock(&nm_i->free_nid_list_lock);
1638 1639

	kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1640 1641
}

J
Jaegeuk Kim 已提交
1642
/*
J
Jaegeuk Kim 已提交
1643 1644 1645 1646
 * alloc_nid() should be called prior to this function.
 */
void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
{
1647 1648
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct free_nid *i;
1649
	bool need_free = false;
1650

J
Jaegeuk Kim 已提交
1651 1652 1653
	if (!nid)
		return;

1654
	spin_lock(&nm_i->free_nid_list_lock);
1655
	i = __lookup_free_nid_list(nm_i, nid);
1656
	f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1657
	if (!available_free_memory(sbi, FREE_NIDS)) {
1658
		__del_from_free_nid_list(nm_i, i);
1659
		need_free = true;
1660 1661 1662 1663
	} else {
		i->state = NID_NEW;
		nm_i->fcnt++;
	}
1664
	spin_unlock(&nm_i->free_nid_list_lock);
1665 1666 1667

	if (need_free)
		kmem_cache_free(free_nid_slab, i);
J
Jaegeuk Kim 已提交
1668 1669
}

C
Chao Yu 已提交
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
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);
1687
		nm_i->fcnt--;
C
Chao Yu 已提交
1688 1689 1690 1691 1692 1693 1694 1695
		nr_shrink--;
	}
	spin_unlock(&nm_i->free_nid_list_lock);
	mutex_unlock(&nm_i->build_lock);

	return nr - nr_shrink;
}

1696
void recover_inline_xattr(struct inode *inode, struct page *page)
1697 1698 1699 1700 1701 1702
{
	void *src_addr, *dst_addr;
	size_t inline_size;
	struct page *ipage;
	struct f2fs_inode *ri;

1703
	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
1704
	f2fs_bug_on(F2FS_I_SB(inode), IS_ERR(ipage));
1705

1706 1707 1708 1709 1710 1711
	ri = F2FS_INODE(page);
	if (!(ri->i_inline & F2FS_INLINE_XATTR)) {
		clear_inode_flag(F2FS_I(inode), FI_INLINE_XATTR);
		goto update_inode;
	}

1712 1713 1714 1715
	dst_addr = inline_xattr_addr(ipage);
	src_addr = inline_xattr_addr(page);
	inline_size = inline_xattr_size(inode);

1716
	f2fs_wait_on_page_writeback(ipage, NODE);
1717
	memcpy(dst_addr, src_addr, inline_size);
1718
update_inode:
1719 1720 1721 1722
	update_inode(inode, ipage);
	f2fs_put_page(ipage, 1);
}

1723
void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
1724
{
1725
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1726 1727 1728 1729 1730 1731 1732 1733 1734 1735
	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);
1736
	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
1737 1738
	invalidate_blocks(sbi, ni.blk_addr);
	dec_valid_node_count(sbi, inode);
1739
	set_node_addr(sbi, &ni, NULL_ADDR, false);
1740 1741 1742 1743

recover_xnid:
	/* 2: allocate new xattr nid */
	if (unlikely(!inc_valid_node_count(sbi, inode)))
1744
		f2fs_bug_on(sbi, 1);
1745 1746 1747 1748

	remove_free_nid(NM_I(sbi), new_xnid);
	get_node_info(sbi, new_xnid, &ni);
	ni.ino = inode->i_ino;
1749
	set_node_addr(sbi, &ni, NEW_ADDR, false);
1750 1751 1752 1753
	F2FS_I(inode)->i_xattr_nid = new_xnid;

	/* 3: update xattr blkaddr */
	refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
1754
	set_node_addr(sbi, &ni, blkaddr, false);
1755 1756 1757 1758

	update_inode_page(inode);
}

J
Jaegeuk Kim 已提交
1759 1760
int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
{
1761
	struct f2fs_inode *src, *dst;
J
Jaegeuk Kim 已提交
1762 1763 1764 1765
	nid_t ino = ino_of_node(page);
	struct node_info old_ni, new_ni;
	struct page *ipage;

1766 1767 1768 1769 1770
	get_node_info(sbi, ino, &old_ni);

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

1771
	ipage = grab_cache_page(NODE_MAPPING(sbi), ino);
J
Jaegeuk Kim 已提交
1772 1773 1774
	if (!ipage)
		return -ENOMEM;

A
arter97 已提交
1775
	/* Should not use this inode from free nid list */
J
Jaegeuk Kim 已提交
1776 1777 1778 1779 1780
	remove_free_nid(NM_I(sbi), ino);

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

1781 1782
	src = F2FS_INODE(page);
	dst = F2FS_INODE(ipage);
J
Jaegeuk Kim 已提交
1783

1784 1785 1786 1787 1788
	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;
1789
	dst->i_inline = src->i_inline & F2FS_INLINE_XATTR;
J
Jaegeuk Kim 已提交
1790 1791 1792 1793

	new_ni = old_ni;
	new_ni.ino = ino;

1794
	if (unlikely(!inc_valid_node_count(sbi, NULL)))
1795
		WARN_ON(1);
1796
	set_node_addr(sbi, &new_ni, NEW_ADDR, false);
J
Jaegeuk Kim 已提交
1797
	inc_valid_inode_count(sbi);
1798
	set_page_dirty(ipage);
J
Jaegeuk Kim 已提交
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808
	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
1809
	int bio_blocks = MAX_BIO_BLOCKS(sbi);
1810
	int i, idx, last_offset, nrpages;
J
Jaegeuk Kim 已提交
1811 1812 1813 1814 1815 1816

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

1817
	for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
1818
		nrpages = min(last_offset - i, bio_blocks);
1819

A
arter97 已提交
1820
		/* readahead node pages */
1821
		ra_meta_pages(sbi, addr, nrpages, META_POR, true);
J
Jaegeuk Kim 已提交
1822

1823
		for (idx = addr; idx < addr + nrpages; idx++) {
1824
			struct page *page = get_tmp_page(sbi, idx);
1825

1826 1827 1828 1829 1830 1831
			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);
1832
		}
1833

1834
		invalidate_mapping_pages(META_MAPPING(sbi), addr,
1835
							addr + nrpages);
J
Jaegeuk Kim 已提交
1836
	}
1837
	return 0;
J
Jaegeuk Kim 已提交
1838 1839
}

1840
static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
J
Jaegeuk Kim 已提交
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
{
	struct f2fs_nm_info *nm_i = NM_I(sbi);
	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
	struct f2fs_summary_block *sum = curseg->sum_blk;
	int i;

	mutex_lock(&curseg->curseg_mutex);
	for (i = 0; i < nats_in_cursum(sum); i++) {
		struct nat_entry *ne;
		struct f2fs_nat_entry raw_ne;
		nid_t nid = le32_to_cpu(nid_in_journal(sum, i));

		raw_ne = nat_in_journal(sum, i);
1854

1855
		down_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
1856 1857
		ne = __lookup_nat_cache(nm_i, nid);
		if (!ne) {
1858 1859
			ne = grab_nat_entry(nm_i, nid);
			node_info_from_raw_nat(&ne->ni, &raw_ne);
J
Jaegeuk Kim 已提交
1860 1861
		}
		__set_nat_cache_dirty(nm_i, ne);
1862
		up_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
1863 1864 1865 1866 1867
	}
	update_nats_in_cursum(sum, -i);
	mutex_unlock(&curseg->curseg_mutex);
}

1868 1869
static void __adjust_nat_entry_set(struct nat_entry_set *nes,
						struct list_head *head, int max)
J
Jaegeuk Kim 已提交
1870
{
1871
	struct nat_entry_set *cur;
J
Jaegeuk Kim 已提交
1872

1873 1874
	if (nes->entry_cnt >= max)
		goto add_out;
J
Jaegeuk Kim 已提交
1875

1876 1877 1878 1879 1880
	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;
		}
1881
	}
1882 1883 1884
add_out:
	list_add_tail(&nes->set_list, head);
}
J
Jaegeuk Kim 已提交
1885

1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
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);
	struct f2fs_summary_block *sum = curseg->sum_blk;
	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;
1896
	struct f2fs_nm_info *nm_i = NM_I(sbi);
J
Jaegeuk Kim 已提交
1897

1898 1899 1900 1901 1902
	/*
	 * 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.
	 */
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
	if (!__has_cursum_space(sum, set->entry_cnt, NAT_JOURNAL))
		to_journal = false;

	if (to_journal) {
		mutex_lock(&curseg->curseg_mutex);
	} else {
		page = get_next_nat_page(sbi, start_nid);
		nat_blk = page_address(page);
		f2fs_bug_on(sbi, !nat_blk);
	}
1913

1914 1915 1916 1917 1918 1919 1920 1921
	/* 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;
1922 1923

		if (to_journal) {
1924 1925 1926 1927 1928
			offset = lookup_journal_in_cursum(sum,
							NAT_JOURNAL, nid, 1);
			f2fs_bug_on(sbi, offset < 0);
			raw_ne = &nat_in_journal(sum, offset);
			nid_in_journal(sum, offset) = cpu_to_le32(nid);
1929
		} else {
1930
			raw_ne = &nat_blk->entries[nid - start_nid];
J
Jaegeuk Kim 已提交
1931
		}
1932
		raw_nat_from_node_info(raw_ne, &ne->ni);
J
Jaegeuk Kim 已提交
1933

1934
		down_write(&NM_I(sbi)->nat_tree_lock);
1935 1936
		nat_reset_flag(ne);
		__clear_nat_cache_dirty(NM_I(sbi), ne);
1937
		up_write(&NM_I(sbi)->nat_tree_lock);
1938

1939 1940 1941
		if (nat_get_blkaddr(ne) == NULL_ADDR)
			add_free_nid(sbi, nid, false);
	}
J
Jaegeuk Kim 已提交
1942

1943 1944 1945 1946
	if (to_journal)
		mutex_unlock(&curseg->curseg_mutex);
	else
		f2fs_put_page(page, 1);
1947

1948 1949
	f2fs_bug_on(sbi, set->entry_cnt);

1950
	down_write(&nm_i->nat_tree_lock);
1951
	radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set);
1952
	up_write(&nm_i->nat_tree_lock);
1953
	kmem_cache_free(nat_entry_set_slab, set);
1954
}
1955

1956 1957 1958 1959 1960 1961 1962 1963
/*
 * 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);
	struct f2fs_summary_block *sum = curseg->sum_blk;
1964
	struct nat_entry_set *setvec[SETVEC_SIZE];
1965 1966 1967 1968 1969
	struct nat_entry_set *set, *tmp;
	unsigned int found;
	nid_t set_idx = 0;
	LIST_HEAD(sets);

1970 1971
	if (!nm_i->dirty_nat_cnt)
		return;
1972 1973 1974 1975 1976 1977 1978 1979
	/*
	 * 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.
	 */
	if (!__has_cursum_space(sum, nm_i->dirty_nat_cnt, NAT_JOURNAL))
		remove_nats_in_journal(sbi);

1980
	down_write(&nm_i->nat_tree_lock);
1981
	while ((found = __gang_lookup_nat_set(nm_i,
1982
					set_idx, SETVEC_SIZE, setvec))) {
1983 1984 1985 1986 1987
		unsigned idx;
		set_idx = setvec[found - 1]->set + 1;
		for (idx = 0; idx < found; idx++)
			__adjust_nat_entry_set(setvec[idx], &sets,
							MAX_NAT_JENTRIES(sum));
J
Jaegeuk Kim 已提交
1988
	}
1989
	up_write(&nm_i->nat_tree_lock);
1990

1991 1992 1993 1994
	/* flush dirty nats in nat entry set */
	list_for_each_entry_safe(set, tmp, &sets, set_list)
		__flush_nat_entry_set(sbi, set);

1995
	f2fs_bug_on(sbi, nm_i->dirty_nat_cnt);
J
Jaegeuk Kim 已提交
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
}

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);
2010

2011 2012
	nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;

2013
	/* not used nids: 0, node, meta, (and root counted as valid node) */
2014
	nm_i->available_nids = nm_i->max_nid - F2FS_RESERVED_NODE_NUM;
J
Jaegeuk Kim 已提交
2015 2016
	nm_i->fcnt = 0;
	nm_i->nat_cnt = 0;
2017
	nm_i->ram_thresh = DEF_RAM_THRESHOLD;
C
Chao Yu 已提交
2018
	nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
J
Jaegeuk Kim 已提交
2019

2020
	INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
J
Jaegeuk Kim 已提交
2021
	INIT_LIST_HEAD(&nm_i->free_nid_list);
2022 2023
	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
2024 2025 2026 2027
	INIT_LIST_HEAD(&nm_i->nat_entries);

	mutex_init(&nm_i->build_lock);
	spin_lock_init(&nm_i->free_nid_list_lock);
2028
	init_rwsem(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2029 2030

	nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
A
Alexandru Gheorghiu 已提交
2031
	nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
J
Jaegeuk Kim 已提交
2032 2033 2034 2035
	version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
	if (!version_bitmap)
		return -EFAULT;

A
Alexandru Gheorghiu 已提交
2036 2037 2038 2039
	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
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	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];
2064
	struct nat_entry_set *setvec[SETVEC_SIZE];
J
Jaegeuk Kim 已提交
2065 2066 2067 2068 2069 2070 2071 2072 2073
	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) {
2074
		f2fs_bug_on(sbi, i->state == NID_ALLOC);
2075
		__del_from_free_nid_list(nm_i, i);
J
Jaegeuk Kim 已提交
2076
		nm_i->fcnt--;
2077 2078 2079
		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
2080
	}
2081
	f2fs_bug_on(sbi, nm_i->fcnt);
J
Jaegeuk Kim 已提交
2082 2083 2084
	spin_unlock(&nm_i->free_nid_list_lock);

	/* destroy nat cache */
2085
	down_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2086 2087 2088
	while ((found = __gang_lookup_nat_cache(nm_i,
					nid, NATVEC_SIZE, natvec))) {
		unsigned idx;
2089

2090 2091 2092
		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
2093
	}
2094
	f2fs_bug_on(sbi, nm_i->nat_cnt);
2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109

	/* 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]);
		}
	}
2110
	up_write(&nm_i->nat_tree_lock);
J
Jaegeuk Kim 已提交
2111 2112 2113 2114 2115 2116

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

2117
int __init create_node_manager_caches(void)
J
Jaegeuk Kim 已提交
2118 2119
{
	nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
2120
			sizeof(struct nat_entry));
J
Jaegeuk Kim 已提交
2121
	if (!nat_entry_slab)
2122
		goto fail;
J
Jaegeuk Kim 已提交
2123 2124

	free_nid_slab = f2fs_kmem_cache_create("free_nid",
2125
			sizeof(struct free_nid));
2126
	if (!free_nid_slab)
2127
		goto destroy_nat_entry;
2128 2129 2130 2131

	nat_entry_set_slab = f2fs_kmem_cache_create("nat_entry_set",
			sizeof(struct nat_entry_set));
	if (!nat_entry_set_slab)
2132
		goto destroy_free_nid;
J
Jaegeuk Kim 已提交
2133
	return 0;
2134

2135
destroy_free_nid:
2136
	kmem_cache_destroy(free_nid_slab);
2137
destroy_nat_entry:
2138 2139 2140
	kmem_cache_destroy(nat_entry_slab);
fail:
	return -ENOMEM;
J
Jaegeuk Kim 已提交
2141 2142 2143 2144
}

void destroy_node_manager_caches(void)
{
2145
	kmem_cache_destroy(nat_entry_set_slab);
J
Jaegeuk Kim 已提交
2146 2147 2148
	kmem_cache_destroy(free_nid_slab);
	kmem_cache_destroy(nat_entry_slab);
}