[GitHub/exynos8895/android_kernel_samsung_universal8895.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);
	struct dentry dent, parent;
	struct f2fs_dir_entry *de;
	struct page *page;
	struct inode *dir;
	int err = 0;

	if (!is_dent_dnode(ipage))
		goto out;

	dir = f2fs_iget(inode->i_sb, le32_to_cpu(raw_inode->i_pino));
	if (IS_ERR(dir)) {
		err = -EINVAL;
		goto out;
	}

	parent.d_inode = dir;
	dent.d_parent = &parent;
	dent.d_name.len = le32_to_cpu(raw_inode->i_namelen);
	dent.d_name.name = raw_inode->i_name;

	de = f2fs_find_entry(dir, &dent.d_name, &page);
	if (de) {
		kunmap(page);
		f2fs_put_page(page, 0);
	} else {
		f2fs_add_link(&dent, inode);
	}
	iput(dir);
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;

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

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

		if (!is_fsync_dnode(page))
			goto next;

		entry = get_fsync_inode(head, ino_of_node(page));
		if (entry) {
			entry->blkaddr = blkaddr;
			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)) {
				if (recover_inode_page(sbi, page)) {
					err = -ENOMEM;
					goto out;
				}
			}

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

			INIT_LIST_HEAD(&entry->list);
			list_add_tail(&entry->list, head);

			entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
			if (IS_ERR(entry->inode)) {
				err = PTR_ERR(entry->inode);
				goto out;
			}
			entry->blkaddr = blkaddr;
		}
		if (IS_INODE(page)) {
			err = recover_inode(entry->inode, page);
			if (err)
				goto out;
		}
next:
		/* check next segment */
		blkaddr = next_blkaddr_of_node(page);
		ClearPageUptodate(page);
	}
out:
	unlock_page(page);
	__free_pages(page, 0);
	return err;
}

static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
					struct list_head *head)
{
	struct list_head *this;
	struct fsync_inode_entry *entry;
	list_for_each(this, head) {
		entry = list_entry(this, struct fsync_inode_entry, 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_nowait(sbi->sb, ino);
	if (IS_ERR(inode))
		return;

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

static void 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;

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

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	if (get_dnode_of_data(&dn, start, 0))
		return;

	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);
}

static void 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;
	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;
	lock_page(page);

	while (1) {
		struct fsync_inode_entry *entry;

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

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

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

		do_recover_data(sbi, entry->inode, page, blkaddr);

		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);
		ClearPageUptodate(page);
	}
out:
	unlock_page(page);
	__free_pages(page, 0);

	allocate_new_segments(sbi);
}

void recover_fsync_data(struct f2fs_sb_info *sbi)
{
	struct list_head inode_list;

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

	INIT_LIST_HEAD(&inode_list);

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

	if (list_empty(&inode_list))
		goto out;

	/* step #2: recover data */
	sbi->por_doing = 1;
	recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
	sbi->por_doing = 0;
	BUG_ON(!list_empty(&inode_list));
out:
	destroy_fsync_dnodes(sbi, &inode_list);
	kmem_cache_destroy(fsync_entry_slab);
	write_checkpoint(sbi, false, false);
}
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);
	45	struct dentry dent, parent;
	46	struct f2fs_dir_entry *de;
	47	struct page *page;
	48	struct inode *dir;
	49	int err = 0;
	50
	51	if (!is_dent_dnode(ipage))
	52	goto out;
	53
	54	dir = f2fs_iget(inode->i_sb, le32_to_cpu(raw_inode->i_pino));
	55	if (IS_ERR(dir)) {
	56	err = -EINVAL;
	57	goto out;
	58	}
	59
	60	parent.d_inode = dir;
	61	dent.d_parent = &parent;
	62	dent.d_name.len = le32_to_cpu(raw_inode->i_namelen);
	63	dent.d_name.name = raw_inode->i_name;
	64
	65	de = f2fs_find_entry(dir, &dent.d_name, &page);
66	if (de) {
67	kunmap(page);
68	f2fs_put_page(page, 0);
69	} else {
70	f2fs_add_link(&dent, inode);
71	}
72	iput(dir);
73	out:
74	kunmap(ipage);
75	return err;
76	}
77
78	static int recover_inode(struct inode inode, struct page node_page)
79	{
80	void *kaddr = page_address(node_page);
81	struct f2fs_node raw_node = (struct f2fs_node )kaddr;
82	struct f2fs_inode *raw_inode = &(raw_node->i);
83
25ca923b	84	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
d624c96f JK	85	i_size_write(inode, le64_to_cpu(raw_inode->i_size));
	86	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	87	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	88	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	89	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	90	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	91	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	92
	93	return recover_dentry(node_page, inode);
	94	}
	95
	96	static int find_fsync_dnodes(struct f2fs_sb_info sbi, struct list_head head)
	97	{
	98	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	99	struct curseg_info *curseg;
	100	struct page *page;
	101	block_t blkaddr;
	102	int err = 0;
	103
	104	/* get node pages in the current segment */
	105	curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
	106	blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
	107
	108	/* read node page */
	109	page = alloc_page(GFP_F2FS_ZERO);
	110	if (IS_ERR(page))
	111	return PTR_ERR(page);
	112	lock_page(page);
	113
	114	while (1) {
	115	struct fsync_inode_entry *entry;
	116
	117	if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC))
	118	goto out;
	119
	120	if (cp_ver != cpver_of_node(page))
	121	goto out;
	122
	123	if (!is_fsync_dnode(page))
	124	goto next;
	125
	126	entry = get_fsync_inode(head, ino_of_node(page));
	127	if (entry) {
	128	entry->blkaddr = blkaddr;
	129	if (IS_INODE(page) && is_dent_dnode(page))
	130	set_inode_flag(F2FS_I(entry->inode),
	131	FI_INC_LINK);
	132	} else {
	133	if (IS_INODE(page) && is_dent_dnode(page)) {
	134	if (recover_inode_page(sbi, page)) {
	135	err = -ENOMEM;
	136	goto out;
	137	}
	138	}
	139
	140	/* add this fsync inode to the list */
	141	entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
	142	if (!entry) {
	143	err = -ENOMEM;
	144	goto out;
	145	}
	146
	147	INIT_LIST_HEAD(&entry->list);
	148	list_add_tail(&entry->list, head);
149
150	entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
151	if (IS_ERR(entry->inode)) {
152	err = PTR_ERR(entry->inode);
153	goto out;
154	}
155	entry->blkaddr = blkaddr;
156	}
157	if (IS_INODE(page)) {
158	err = recover_inode(entry->inode, page);
159	if (err)
160	goto out;
161	}
162	next:
163	/* check next segment */
164	blkaddr = next_blkaddr_of_node(page);
165	ClearPageUptodate(page);
166	}
167	out:
168	unlock_page(page);
169	__free_pages(page, 0);
170	return err;
171	}
172
173	static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
174	struct list_head *head)
175	{
176	struct list_head *this;
177	struct fsync_inode_entry *entry;
178	list_for_each(this, head) {
179	entry = list_entry(this, struct fsync_inode_entry, list);
180	iput(entry->inode);
181	list_del(&entry->list);
182	kmem_cache_free(fsync_entry_slab, entry);
183	}
184	}
185
186	static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
187	block_t blkaddr)
188	{
189	struct seg_entry *sentry;
190	unsigned int segno = GET_SEGNO(sbi, blkaddr);
191	unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
192	(sbi->blocks_per_seg - 1);
193	struct f2fs_summary sum;
194	nid_t ino;
195	void *kaddr;
196	struct inode *inode;
197	struct page *node_page;
198	block_t bidx;
199	int i;
200
201	sentry = get_seg_entry(sbi, segno);
202	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
203	return;
204
205	/* Get the previous summary */
206	for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
207	struct curseg_info *curseg = CURSEG_I(sbi, i);
208	if (curseg->segno == segno) {
209	sum = curseg->sum_blk->entries[blkoff];
210	break;
211	}
212	}
213	if (i > CURSEG_COLD_DATA) {
214	struct page *sum_page = get_sum_page(sbi, segno);
215	struct f2fs_summary_block *sum_node;
216	kaddr = page_address(sum_page);
217	sum_node = (struct f2fs_summary_block *)kaddr;
218	sum = sum_node->entries[blkoff];
219	f2fs_put_page(sum_page, 1);
220	}
221
222	/* Get the node page */
223	node_page = get_node_page(sbi, le32_to_cpu(sum.nid));
224	bidx = start_bidx_of_node(ofs_of_node(node_page)) +
225	le16_to_cpu(sum.ofs_in_node);
226	ino = ino_of_node(node_page);
227	f2fs_put_page(node_page, 1);
228
229	/* Deallocate previous index in the node page */
230	inode = f2fs_iget_nowait(sbi->sb, ino);
06025f4d NJ	231	if (IS_ERR(inode))
	232	return;
	233
d624c96f JK	234	truncate_hole(inode, bidx, bidx + 1);
	235	iput(inode);
	236	}
	237
	238	static void do_recover_data(struct f2fs_sb_info sbi, struct inode inode,
	239	struct page *page, block_t blkaddr)
	240	{
	241	unsigned int start, end;
	242	struct dnode_of_data dn;
	243	struct f2fs_summary sum;
	244	struct node_info ni;
	245
	246	start = start_bidx_of_node(ofs_of_node(page));
	247	if (IS_INODE(page))
	248	end = start + ADDRS_PER_INODE;
	249	else
	250	end = start + ADDRS_PER_BLOCK;
	251
	252	set_new_dnode(&dn, inode, NULL, NULL, 0);
	253	if (get_dnode_of_data(&dn, start, 0))
	254	return;
	255
	256	wait_on_page_writeback(dn.node_page);
	257
	258	get_node_info(sbi, dn.nid, &ni);
	259	BUG_ON(ni.ino != ino_of_node(page));
	260	BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));
	261
	262	for (; start < end; start++) {
	263	block_t src, dest;
	264
	265	src = datablock_addr(dn.node_page, dn.ofs_in_node);
	266	dest = datablock_addr(page, dn.ofs_in_node);
	267
	268	if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
	269	if (src == NULL_ADDR) {
	270	int err = reserve_new_block(&dn);
	271	/* We should not get -ENOSPC */
	272	BUG_ON(err);
	273	}
	274
	275	/* Check the previous node page having this index */
	276	check_index_in_prev_nodes(sbi, dest);
	277
	278	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
	279
	280	/* write dummy data page */
	281	recover_data_page(sbi, NULL, &sum, src, dest);
	282	update_extent_cache(dest, &dn);
	283	}
	284	dn.ofs_in_node++;
	285	}
	286
	287	/* write node page in place */
	288	set_summary(&sum, dn.nid, 0, 0);
	289	if (IS_INODE(dn.node_page))
	290	sync_inode_page(&dn);
	291
	292	copy_node_footer(dn.node_page, page);
	293	fill_node_footer(dn.node_page, dn.nid, ni.ino,
	294	ofs_of_node(page), false);
	295	set_page_dirty(dn.node_page);
	296
	297	recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
298	f2fs_put_dnode(&dn);
299	}
300
301	static void recover_data(struct f2fs_sb_info *sbi,
302	struct list_head *head, int type)
303	{
304	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
305	struct curseg_info *curseg;
306	struct page *page;
307	block_t blkaddr;
308
309	/* get node pages in the current segment */
310	curseg = CURSEG_I(sbi, type);
311	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
312
313	/* read node page */
314	page = alloc_page(GFP_NOFS \| __GFP_ZERO);
315	if (IS_ERR(page))
316	return;
317	lock_page(page);
318
319	while (1) {
320	struct fsync_inode_entry *entry;
321
322	if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC))
323	goto out;
324
325	if (cp_ver != cpver_of_node(page))
326	goto out;
327
328	entry = get_fsync_inode(head, ino_of_node(page));
329	if (!entry)
330	goto next;
331
332	do_recover_data(sbi, entry->inode, page, blkaddr);
333
334	if (entry->blkaddr == blkaddr) {
335	iput(entry->inode);
336	list_del(&entry->list);
337	kmem_cache_free(fsync_entry_slab, entry);
338	}
339	next:
340	/* check next segment */
341	blkaddr = next_blkaddr_of_node(page);
342	ClearPageUptodate(page);
343	}
344	out:
345	unlock_page(page);
346	__free_pages(page, 0);
347
348	allocate_new_segments(sbi);
349	}
350
351	void recover_fsync_data(struct f2fs_sb_info *sbi)
352	{
353	struct list_head inode_list;
354
355	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
356	sizeof(struct fsync_inode_entry), NULL);
357	if (unlikely(!fsync_entry_slab))
358	return;
359
360	INIT_LIST_HEAD(&inode_list);
361
362	/* step #1: find fsynced inode numbers */
363	if (find_fsync_dnodes(sbi, &inode_list))
364	goto out;
365
366	if (list_empty(&inode_list))
367	goto out;
368
369	/* step #2: recover data */
370	sbi->por_doing = 1;
371	recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
372	sbi->por_doing = 0;
373	BUG_ON(!list_empty(&inode_list));
374	out:
375	destroy_fsync_dnodes(sbi, &inode_list);
376	kmem_cache_destroy(fsync_entry_slab);
377	write_checkpoint(sbi, false, false);
378	}