[linux-block.git] / fs / f2fs / recovery.c

/*
 * fs/f2fs/recovery.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 "f2fs.h"
#include "node.h"
#include "segment.h"

static struct kmem_cache *fsync_entry_slab;

bool space_for_roll_forward(struct f2fs_sb_info *sbi)
{
	if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
			> sbi->user_block_count)
		return false;
	return true;
}

static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
								nid_t ino)
{
	struct list_head *this;
	struct fsync_inode_entry *entry;

	list_for_each(this, head) {
		entry = list_entry(this, struct fsync_inode_entry, list);
		if (entry->inode->i_ino == ino)
			return entry;
	}
	return NULL;
}

static int recover_dentry(struct page *ipage, struct inode *inode)
{
	struct f2fs_node *raw_node = (struct f2fs_node *)kmap(ipage);
	struct f2fs_inode *raw_inode = &(raw_node->i);
	nid_t pino = le32_to_cpu(raw_inode->i_pino);
	struct qstr name;
	struct f2fs_dir_entry *de;
	struct page *page;
	struct inode *dir;
	int err = 0;

	if (!is_dent_dnode(ipage))
		goto out;

	dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
	if (!dir) {
		dir = f2fs_iget(inode->i_sb, pino);
		if (IS_ERR(dir)) {
			err = PTR_ERR(dir);
			goto out;
		}
		set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
	}

	name.len = le32_to_cpu(raw_inode->i_namelen);
	name.name = raw_inode->i_name;

	de = f2fs_find_entry(dir, &name, &page);
	if (de) {
		kunmap(page);
		f2fs_put_page(page, 0);
	} else {
		err = __f2fs_add_link(dir, &name, inode);
	}
out:
	kunmap(ipage);
	return err;
}

static int recover_inode(struct inode *inode, struct page *node_page)
{
	void *kaddr = page_address(node_page);
	struct f2fs_node *raw_node = (struct f2fs_node *)kaddr;
	struct f2fs_inode *raw_inode = &(raw_node->i);

	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
	i_size_write(inode, le64_to_cpu(raw_inode->i_size));
	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);

	return recover_dentry(node_page, inode);
}

static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
{
	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	struct curseg_info *curseg;
	struct page *page;
	block_t blkaddr;
	int err = 0;

	/* get node pages in the current segment */
	curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
	blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;

	/* read node page */
	page = alloc_page(GFP_F2FS_ZERO);
	if (IS_ERR(page))
		return PTR_ERR(page);
	lock_page(page);

	while (1) {
		struct fsync_inode_entry *entry;

		err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
		if (err)
			goto out;

		lock_page(page);

		if (cp_ver != cpver_of_node(page))
			goto unlock_out;

		if (!is_fsync_dnode(page))
			goto next;

		entry = get_fsync_inode(head, ino_of_node(page));
		if (entry) {
			if (IS_INODE(page) && is_dent_dnode(page))
				set_inode_flag(F2FS_I(entry->inode),
							FI_INC_LINK);
		} else {
			if (IS_INODE(page) && is_dent_dnode(page)) {
				err = recover_inode_page(sbi, page);
				if (err)
					goto unlock_out;
			}

			/* add this fsync inode to the list */
			entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
			if (!entry) {
				err = -ENOMEM;
				goto unlock_out;
			}

			entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
			if (IS_ERR(entry->inode)) {
				err = PTR_ERR(entry->inode);
				kmem_cache_free(fsync_entry_slab, entry);
				goto unlock_out;
			}
			list_add_tail(&entry->list, head);
		}
		entry->blkaddr = blkaddr;

		if (IS_INODE(page)) {
			err = recover_inode(entry->inode, page);
			if (err == -ENOENT) {
				goto next;
			} else if (err) {
				err = -EINVAL;
				goto unlock_out;
			}
		}
next:
		/* check next segment */
		blkaddr = next_blkaddr_of_node(page);
	}
unlock_out:
	unlock_page(page);
out:
	__free_pages(page, 0);
	return err;
}

static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
					struct list_head *head)
{
	struct fsync_inode_entry *entry, *tmp;

	list_for_each_entry_safe(entry, tmp, head, list) {
		iput(entry->inode);
		list_del(&entry->list);
		kmem_cache_free(fsync_entry_slab, entry);
	}
}

static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
						block_t blkaddr)
{
	struct seg_entry *sentry;
	unsigned int segno = GET_SEGNO(sbi, blkaddr);
	unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
					(sbi->blocks_per_seg - 1);
	struct f2fs_summary sum;
	nid_t ino;
	void *kaddr;
	struct inode *inode;
	struct page *node_page;
	block_t bidx;
	int i;

	sentry = get_seg_entry(sbi, segno);
	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
		return;

	/* Get the previous summary */
	for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
		struct curseg_info *curseg = CURSEG_I(sbi, i);
		if (curseg->segno == segno) {
			sum = curseg->sum_blk->entries[blkoff];
			break;
		}
	}
	if (i > CURSEG_COLD_DATA) {
		struct page *sum_page = get_sum_page(sbi, segno);
		struct f2fs_summary_block *sum_node;
		kaddr = page_address(sum_page);
		sum_node = (struct f2fs_summary_block *)kaddr;
		sum = sum_node->entries[blkoff];
		f2fs_put_page(sum_page, 1);
	}

	/* Get the node page */
	node_page = get_node_page(sbi, le32_to_cpu(sum.nid));
	bidx = start_bidx_of_node(ofs_of_node(node_page)) +
				le16_to_cpu(sum.ofs_in_node);
	ino = ino_of_node(node_page);
	f2fs_put_page(node_page, 1);

	/* Deallocate previous index in the node page */
	inode = f2fs_iget(sbi->sb, ino);
	if (IS_ERR(inode))
		return;

	truncate_hole(inode, bidx, bidx + 1);
	iput(inode);
}

static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
					struct page *page, block_t blkaddr)
{
	unsigned int start, end;
	struct dnode_of_data dn;
	struct f2fs_summary sum;
	struct node_info ni;
	int err = 0;
	int ilock;

	start = start_bidx_of_node(ofs_of_node(page));
	if (IS_INODE(page))
		end = start + ADDRS_PER_INODE;
	else
		end = start + ADDRS_PER_BLOCK;

	ilock = mutex_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);

	err = get_dnode_of_data(&dn, start, ALLOC_NODE);
	if (err) {
		mutex_unlock_op(sbi, ilock);
		return err;
	}

	wait_on_page_writeback(dn.node_page);

	get_node_info(sbi, dn.nid, &ni);
	BUG_ON(ni.ino != ino_of_node(page));
	BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));

	for (; start < end; start++) {
		block_t src, dest;

		src = datablock_addr(dn.node_page, dn.ofs_in_node);
		dest = datablock_addr(page, dn.ofs_in_node);

		if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
			if (src == NULL_ADDR) {
				int err = reserve_new_block(&dn);
				/* We should not get -ENOSPC */
				BUG_ON(err);
			}

			/* Check the previous node page having this index */
			check_index_in_prev_nodes(sbi, dest);

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

			/* write dummy data page */
			recover_data_page(sbi, NULL, &sum, src, dest);
			update_extent_cache(dest, &dn);
		}
		dn.ofs_in_node++;
	}

	/* write node page in place */
	set_summary(&sum, dn.nid, 0, 0);
	if (IS_INODE(dn.node_page))
		sync_inode_page(&dn);

	copy_node_footer(dn.node_page, page);
	fill_node_footer(dn.node_page, dn.nid, ni.ino,
					ofs_of_node(page), false);
	set_page_dirty(dn.node_page);

	recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
	f2fs_put_dnode(&dn);
	mutex_unlock_op(sbi, ilock);
	return 0;
}

static int recover_data(struct f2fs_sb_info *sbi,
				struct list_head *head, int type)
{
	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	struct curseg_info *curseg;
	struct page *page;
	int err = 0;
	block_t blkaddr;

	/* get node pages in the current segment */
	curseg = CURSEG_I(sbi, type);
	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);

	/* read node page */
	page = alloc_page(GFP_NOFS | __GFP_ZERO);
	if (IS_ERR(page))
		return -ENOMEM;

	lock_page(page);

	while (1) {
		struct fsync_inode_entry *entry;

		err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
		if (err)
			goto out;

		lock_page(page);

		if (cp_ver != cpver_of_node(page))
			goto unlock_out;

		entry = get_fsync_inode(head, ino_of_node(page));
		if (!entry)
			goto next;

		err = do_recover_data(sbi, entry->inode, page, blkaddr);
		if (err)
			goto out;

		if (entry->blkaddr == blkaddr) {
			iput(entry->inode);
			list_del(&entry->list);
			kmem_cache_free(fsync_entry_slab, entry);
		}
next:
		/* check next segment */
		blkaddr = next_blkaddr_of_node(page);
	}
unlock_out:
	unlock_page(page);
out:
	__free_pages(page, 0);

	if (!err)
		allocate_new_segments(sbi);
	return err;
}

int recover_fsync_data(struct f2fs_sb_info *sbi)
{
	struct list_head inode_list;
	int err;

	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
			sizeof(struct fsync_inode_entry), NULL);
	if (unlikely(!fsync_entry_slab))
		return -ENOMEM;

	INIT_LIST_HEAD(&inode_list);

	/* step #1: find fsynced inode numbers */
	sbi->por_doing = 1;
	err = find_fsync_dnodes(sbi, &inode_list);
	if (err)
		goto out;

	if (list_empty(&inode_list))
		goto out;

	/* step #2: recover data */
	err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
	BUG_ON(!list_empty(&inode_list));
out:
	destroy_fsync_dnodes(sbi, &inode_list);
	kmem_cache_destroy(fsync_entry_slab);
	sbi->por_doing = 0;
	write_checkpoint(sbi, false);
	return err;
}
Commit	Line	Data
0a8165d7	1	/*
d624c96f JK	2	* fs/f2fs/recovery.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include "f2fs.h"
	14	#include "node.h"
	15	#include "segment.h"
	16
	17	static struct kmem_cache *fsync_entry_slab;
	18
	19	bool space_for_roll_forward(struct f2fs_sb_info *sbi)
	20	{
	21	if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
	22	> sbi->user_block_count)
	23	return false;
	24	return true;
	25	}
	26
	27	static struct fsync_inode_entry get_fsync_inode(struct list_head head,
	28	nid_t ino)
	29	{
	30	struct list_head *this;
	31	struct fsync_inode_entry *entry;
	32
	33	list_for_each(this, head) {
	34	entry = list_entry(this, struct fsync_inode_entry, list);
	35	if (entry->inode->i_ino == ino)
	36	return entry;
	37	}
	38	return NULL;
	39	}
	40
	41	static int recover_dentry(struct page ipage, struct inode inode)
	42	{
	43	struct f2fs_node raw_node = (struct f2fs_node )kmap(ipage);
	44	struct f2fs_inode *raw_inode = &(raw_node->i);
74d0b917	45	nid_t pino = le32_to_cpu(raw_inode->i_pino);
b7f7a5e0	46	struct qstr name;
d624c96f JK	47	struct f2fs_dir_entry *de;
	48	struct page *page;
	49	struct inode *dir;
	50	int err = 0;
	51
	52	if (!is_dent_dnode(ipage))
	53	goto out;
	54
74d0b917 JK	55	dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
	56	if (!dir) {
	57	dir = f2fs_iget(inode->i_sb, pino);
	58	if (IS_ERR(dir)) {
	59	err = PTR_ERR(dir);
	60	goto out;
	61	}
	62	set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
d624c96f JK	63	}
d624c96f JK	64
b7f7a5e0 AV	65	name.len = le32_to_cpu(raw_inode->i_namelen);
b7f7a5e0 AV	66	name.name = raw_inode->i_name;
d624c96f	67
b7f7a5e0	68	de = f2fs_find_entry(dir, &name, &page);
d624c96f JK	69	if (de) {
	70	kunmap(page);
	71	f2fs_put_page(page, 0);
	72	} else {
90b2fc64	73	err = __f2fs_add_link(dir, &name, inode);
d624c96f	74	}
d624c96f JK	75	out:
	76	kunmap(ipage);
	77	return err;
	78	}
	79
	80	static int recover_inode(struct inode inode, struct page node_page)
	81	{
	82	void *kaddr = page_address(node_page);
	83	struct f2fs_node raw_node = (struct f2fs_node )kaddr;
	84	struct f2fs_inode *raw_inode = &(raw_node->i);
	85
25ca923b	86	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
d624c96f JK	87	i_size_write(inode, le64_to_cpu(raw_inode->i_size));
	88	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	89	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	90	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	91	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	92	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	93	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	94
	95	return recover_dentry(node_page, inode);
	96	}
	97
	98	static int find_fsync_dnodes(struct f2fs_sb_info sbi, struct list_head head)
	99	{
	100	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	101	struct curseg_info *curseg;
	102	struct page *page;
	103	block_t blkaddr;
	104	int err = 0;
	105
	106	/* get node pages in the current segment */
	107	curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
	108	blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
	109
	110	/* read node page */
	111	page = alloc_page(GFP_F2FS_ZERO);
	112	if (IS_ERR(page))
	113	return PTR_ERR(page);
	114	lock_page(page);
	115
	116	while (1) {
	117	struct fsync_inode_entry *entry;
	118
393ff91f JK	119	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
393ff91f JK	120	if (err)
d624c96f JK	121	goto out;
d624c96f JK	122
393ff91f JK	123	lock_page(page);
393ff91f JK	124
6ead1142	125	if (cp_ver != cpver_of_node(page))
393ff91f	126	goto unlock_out;
d624c96f JK	127
	128	if (!is_fsync_dnode(page))
	129	goto next;
	130
	131	entry = get_fsync_inode(head, ino_of_node(page));
	132	if (entry) {
d624c96f JK	133	if (IS_INODE(page) && is_dent_dnode(page))
	134	set_inode_flag(F2FS_I(entry->inode),
	135	FI_INC_LINK);
	136	} else {
	137	if (IS_INODE(page) && is_dent_dnode(page)) {
6ead1142 JK	138	err = recover_inode_page(sbi, page);
6ead1142 JK	139	if (err)
393ff91f	140	goto unlock_out;
d624c96f JK	141	}
	142
	143	/* add this fsync inode to the list */
	144	entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
	145	if (!entry) {
	146	err = -ENOMEM;
393ff91f	147	goto unlock_out;
d624c96f JK	148	}
d624c96f JK	149
d624c96f JK	150	entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
	151	if (IS_ERR(entry->inode)) {
	152	err = PTR_ERR(entry->inode);
fd8bb65f	153	kmem_cache_free(fsync_entry_slab, entry);
393ff91f	154	goto unlock_out;
d624c96f	155	}
fd8bb65f	156	list_add_tail(&entry->list, head);
d624c96f	157	}
addbe45b JK	158	entry->blkaddr = blkaddr;
addbe45b JK	159
d624c96f JK	160	if (IS_INODE(page)) {
d624c96f JK	161	err = recover_inode(entry->inode, page);
047184b4 CF	162	if (err == -ENOENT) {
	163	goto next;
	164	} else if (err) {
	165	err = -EINVAL;
393ff91f	166	goto unlock_out;
047184b4	167	}
d624c96f JK	168	}
	169	next:
	170	/* check next segment */
	171	blkaddr = next_blkaddr_of_node(page);
d624c96f	172	}
393ff91f	173	unlock_out:
d624c96f	174	unlock_page(page);
393ff91f	175	out:
d624c96f JK	176	__free_pages(page, 0);
	177	return err;
	178	}
	179
	180	static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
	181	struct list_head *head)
	182	{
d8b79b2f DC	183	struct fsync_inode_entry entry, tmp;
	184
	185	list_for_each_entry_safe(entry, tmp, head, list) {
d624c96f JK	186	iput(entry->inode);
	187	list_del(&entry->list);
	188	kmem_cache_free(fsync_entry_slab, entry);
	189	}
	190	}
	191
	192	static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
	193	block_t blkaddr)
	194	{
	195	struct seg_entry *sentry;
	196	unsigned int segno = GET_SEGNO(sbi, blkaddr);
	197	unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
	198	(sbi->blocks_per_seg - 1);
	199	struct f2fs_summary sum;
	200	nid_t ino;
	201	void *kaddr;
	202	struct inode *inode;
	203	struct page *node_page;
	204	block_t bidx;
	205	int i;
	206
	207	sentry = get_seg_entry(sbi, segno);
	208	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
	209	return;
	210
	211	/* Get the previous summary */
	212	for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
	213	struct curseg_info *curseg = CURSEG_I(sbi, i);
	214	if (curseg->segno == segno) {
	215	sum = curseg->sum_blk->entries[blkoff];
	216	break;
	217	}
	218	}
	219	if (i > CURSEG_COLD_DATA) {
	220	struct page *sum_page = get_sum_page(sbi, segno);
	221	struct f2fs_summary_block *sum_node;
	222	kaddr = page_address(sum_page);
	223	sum_node = (struct f2fs_summary_block *)kaddr;
	224	sum = sum_node->entries[blkoff];
	225	f2fs_put_page(sum_page, 1);
	226	}
	227
	228	/* Get the node page */
	229	node_page = get_node_page(sbi, le32_to_cpu(sum.nid));
	230	bidx = start_bidx_of_node(ofs_of_node(node_page)) +
	231	le16_to_cpu(sum.ofs_in_node);
	232	ino = ino_of_node(node_page);
	233	f2fs_put_page(node_page, 1);
	234
	235	/* Deallocate previous index in the node page */
d4686d56	236	inode = f2fs_iget(sbi->sb, ino);
06025f4d NJ	237	if (IS_ERR(inode))
	238	return;
	239
d624c96f JK	240	truncate_hole(inode, bidx, bidx + 1);
	241	iput(inode);
	242	}
	243
6ead1142	244	static int do_recover_data(struct f2fs_sb_info sbi, struct inode inode,
d624c96f JK	245	struct page *page, block_t blkaddr)
	246	{
	247	unsigned int start, end;
	248	struct dnode_of_data dn;
	249	struct f2fs_summary sum;
	250	struct node_info ni;
6ead1142	251	int err = 0;
39936837	252	int ilock;
d624c96f JK	253
	254	start = start_bidx_of_node(ofs_of_node(page));
	255	if (IS_INODE(page))
	256	end = start + ADDRS_PER_INODE;
	257	else
	258	end = start + ADDRS_PER_BLOCK;
	259
39936837	260	ilock = mutex_lock_op(sbi);
d624c96f	261	set_new_dnode(&dn, inode, NULL, NULL, 0);
39936837	262
6ead1142	263	err = get_dnode_of_data(&dn, start, ALLOC_NODE);
39936837 JK	264	if (err) {
39936837 JK	265	mutex_unlock_op(sbi, ilock);
6ead1142	266	return err;
39936837	267	}
d624c96f JK	268
	269	wait_on_page_writeback(dn.node_page);
	270
	271	get_node_info(sbi, dn.nid, &ni);
	272	BUG_ON(ni.ino != ino_of_node(page));
	273	BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));
	274
	275	for (; start < end; start++) {
	276	block_t src, dest;
	277
	278	src = datablock_addr(dn.node_page, dn.ofs_in_node);
	279	dest = datablock_addr(page, dn.ofs_in_node);
	280
	281	if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
	282	if (src == NULL_ADDR) {
	283	int err = reserve_new_block(&dn);
	284	/* We should not get -ENOSPC */
	285	BUG_ON(err);
	286	}
	287
	288	/* Check the previous node page having this index */
	289	check_index_in_prev_nodes(sbi, dest);
	290
	291	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
	292
	293	/* write dummy data page */
	294	recover_data_page(sbi, NULL, &sum, src, dest);
	295	update_extent_cache(dest, &dn);
	296	}
	297	dn.ofs_in_node++;
	298	}
	299
	300	/* write node page in place */
	301	set_summary(&sum, dn.nid, 0, 0);
	302	if (IS_INODE(dn.node_page))
	303	sync_inode_page(&dn);
	304
	305	copy_node_footer(dn.node_page, page);
	306	fill_node_footer(dn.node_page, dn.nid, ni.ino,
	307	ofs_of_node(page), false);
	308	set_page_dirty(dn.node_page);
	309
	310	recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
	311	f2fs_put_dnode(&dn);
39936837	312	mutex_unlock_op(sbi, ilock);
6ead1142	313	return 0;
d624c96f JK	314	}
d624c96f JK	315
6ead1142	316	static int recover_data(struct f2fs_sb_info *sbi,
d624c96f JK	317	struct list_head *head, int type)
	318	{
	319	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	320	struct curseg_info *curseg;
	321	struct page *page;
6ead1142	322	int err = 0;
d624c96f JK	323	block_t blkaddr;
	324
	325	/* get node pages in the current segment */
	326	curseg = CURSEG_I(sbi, type);
	327	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
	328
	329	/* read node page */
	330	page = alloc_page(GFP_NOFS \| __GFP_ZERO);
	331	if (IS_ERR(page))
6ead1142 JK	332	return -ENOMEM;
6ead1142 JK	333
d624c96f JK	334	lock_page(page);
	335
	336	while (1) {
	337	struct fsync_inode_entry *entry;
	338
6ead1142 JK	339	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
6ead1142 JK	340	if (err)
d624c96f JK	341	goto out;
d624c96f JK	342
393ff91f JK	343	lock_page(page);
393ff91f JK	344
d624c96f	345	if (cp_ver != cpver_of_node(page))
393ff91f	346	goto unlock_out;
d624c96f JK	347
	348	entry = get_fsync_inode(head, ino_of_node(page));
	349	if (!entry)
	350	goto next;
	351
6ead1142 JK	352	err = do_recover_data(sbi, entry->inode, page, blkaddr);
	353	if (err)
	354	goto out;
d624c96f JK	355
	356	if (entry->blkaddr == blkaddr) {
	357	iput(entry->inode);
	358	list_del(&entry->list);
	359	kmem_cache_free(fsync_entry_slab, entry);
	360	}
	361	next:
	362	/* check next segment */
	363	blkaddr = next_blkaddr_of_node(page);
d624c96f	364	}
393ff91f	365	unlock_out:
d624c96f	366	unlock_page(page);
393ff91f	367	out:
d624c96f JK	368	__free_pages(page, 0);
d624c96f JK	369
6ead1142 JK	370	if (!err)
	371	allocate_new_segments(sbi);
	372	return err;
d624c96f JK	373	}
d624c96f JK	374
6ead1142	375	int recover_fsync_data(struct f2fs_sb_info *sbi)
d624c96f JK	376	{
d624c96f JK	377	struct list_head inode_list;
6ead1142	378	int err;
d624c96f JK	379
	380	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
	381	sizeof(struct fsync_inode_entry), NULL);
	382	if (unlikely(!fsync_entry_slab))
6ead1142	383	return -ENOMEM;
d624c96f JK	384
	385	INIT_LIST_HEAD(&inode_list);
	386
	387	/* step #1: find fsynced inode numbers */
8c26d7d5	388	sbi->por_doing = 1;
6ead1142 JK	389	err = find_fsync_dnodes(sbi, &inode_list);
6ead1142 JK	390	if (err)
d624c96f JK	391	goto out;
	392
	393	if (list_empty(&inode_list))
	394	goto out;
	395
	396	/* step #2: recover data */
6ead1142	397	err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
d624c96f JK	398	BUG_ON(!list_empty(&inode_list));
	399	out:
	400	destroy_fsync_dnodes(sbi, &inode_list);
	401	kmem_cache_destroy(fsync_entry_slab);
8c26d7d5	402	sbi->por_doing = 0;
43727527	403	write_checkpoint(sbi, false);
6ead1142	404	return err;
d624c96f	405	}