[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)
{
	void *kaddr = page_address(ipage);
	struct f2fs_node *raw_node = (struct f2fs_node *)kaddr;
	struct f2fs_inode *raw_inode = &(raw_node->i);
	nid_t pino = le32_to_cpu(raw_inode->i_pino);
	struct qstr name;
	struct page *page;
	struct inode *dir;
	int err = 0;

	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;

	if (f2fs_find_entry(dir, &name, &page)) {
		kunmap(page);
		f2fs_put_page(page, 0);
	} else {
		err = __f2fs_add_link(dir, &name, inode);
	}
out:
	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
			"ino = %x, name = %s, dir = %lx, err = %d",
			ino_of_node(ipage), raw_inode->i_name, dir->i_ino, err);
	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);

	if (!IS_INODE(node_page))
		return 0;

	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);

	if (is_dent_dnode(node_page))
		return recover_dentry(node_page, inode);

	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
			ino_of_node(node_page), raw_inode->i_name);
	return 0;
}

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))
			break;

		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)
					break;
			}

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

			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);
				break;
			}
			list_add_tail(&entry->list, head);
		}
		entry->blkaddr = blkaddr;

		err = recover_inode(entry->inode, page);
		if (err && err != -ENOENT)
			break;
next:
		/* check next segment */
		blkaddr = next_blkaddr_of_node(page);
	}
	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, recovered = 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);
			recovered++;
		}
		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);

	f2fs_msg(sbi->sb, KERN_NOTICE, "recover_data: ino = %lx, "
			"recovered_data = %d blocks",
			inode->i_ino, recovered);
	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))
			break;

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

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

		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_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;
	if (!err)
		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	{
9a55ed65 JK	43	void *kaddr = page_address(ipage);
9a55ed65 JK	44	struct f2fs_node raw_node = (struct f2fs_node )kaddr;
d624c96f	45	struct f2fs_inode *raw_inode = &(raw_node->i);
74d0b917	46	nid_t pino = le32_to_cpu(raw_inode->i_pino);
b7f7a5e0	47	struct qstr name;
d624c96f JK	48	struct page *page;
	49	struct inode *dir;
	50	int err = 0;
	51
74d0b917 JK	52	dir = check_dirty_dir_inode(F2FS_SB(inode->i_sb), pino);
	53	if (!dir) {
	54	dir = f2fs_iget(inode->i_sb, pino);
	55	if (IS_ERR(dir)) {
	56	err = PTR_ERR(dir);
	57	goto out;
	58	}
	59	set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
d624c96f JK	60	}
d624c96f JK	61
b7f7a5e0 AV	62	name.len = le32_to_cpu(raw_inode->i_namelen);
b7f7a5e0 AV	63	name.name = raw_inode->i_name;
d624c96f	64
9a55ed65	65	if (f2fs_find_entry(dir, &name, &page)) {
d624c96f JK	66	kunmap(page);
	67	f2fs_put_page(page, 0);
	68	} else {
90b2fc64	69	err = __f2fs_add_link(dir, &name, inode);
d624c96f	70	}
d624c96f	71	out:
f356fe0c JK	72	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
	73	"ino = %x, name = %s, dir = %lx, err = %d",
	74	ino_of_node(ipage), raw_inode->i_name, dir->i_ino, err);
d624c96f JK	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
f356fe0c JK	84	if (!IS_INODE(node_page))
	85	return 0;
	86
25ca923b	87	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
d624c96f JK	88	i_size_write(inode, le64_to_cpu(raw_inode->i_size));
	89	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	90	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	91	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	92	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	93	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	94	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	95
f356fe0c JK	96	if (is_dent_dnode(node_page))
	97	return recover_dentry(node_page, inode);
	98
	99	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
	100	ino_of_node(node_page), raw_inode->i_name);
	101	return 0;
d624c96f JK	102	}
	103
	104	static int find_fsync_dnodes(struct f2fs_sb_info sbi, struct list_head head)
	105	{
	106	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	107	struct curseg_info *curseg;
	108	struct page *page;
	109	block_t blkaddr;
	110	int err = 0;
	111
	112	/* get node pages in the current segment */
	113	curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
	114	blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
	115
	116	/* read node page */
	117	page = alloc_page(GFP_F2FS_ZERO);
	118	if (IS_ERR(page))
	119	return PTR_ERR(page);
	120	lock_page(page);
	121
	122	while (1) {
	123	struct fsync_inode_entry *entry;
	124
393ff91f JK	125	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
393ff91f JK	126	if (err)
d624c96f JK	127	goto out;
d624c96f JK	128
393ff91f JK	129	lock_page(page);
393ff91f JK	130
6ead1142	131	if (cp_ver != cpver_of_node(page))
f356fe0c	132	break;
d624c96f JK	133
	134	if (!is_fsync_dnode(page))
	135	goto next;
	136
	137	entry = get_fsync_inode(head, ino_of_node(page));
	138	if (entry) {
d624c96f JK	139	if (IS_INODE(page) && is_dent_dnode(page))
	140	set_inode_flag(F2FS_I(entry->inode),
	141	FI_INC_LINK);
	142	} else {
	143	if (IS_INODE(page) && is_dent_dnode(page)) {
6ead1142 JK	144	err = recover_inode_page(sbi, page);
6ead1142 JK	145	if (err)
f356fe0c	146	break;
d624c96f JK	147	}
	148
	149	/* add this fsync inode to the list */
	150	entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
	151	if (!entry) {
	152	err = -ENOMEM;
f356fe0c	153	break;
d624c96f JK	154	}
d624c96f JK	155
d624c96f JK	156	entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
	157	if (IS_ERR(entry->inode)) {
	158	err = PTR_ERR(entry->inode);
fd8bb65f	159	kmem_cache_free(fsync_entry_slab, entry);
f356fe0c	160	break;
d624c96f	161	}
fd8bb65f	162	list_add_tail(&entry->list, head);
d624c96f	163	}
addbe45b JK	164	entry->blkaddr = blkaddr;
addbe45b JK	165
f356fe0c JK	166	err = recover_inode(entry->inode, page);
	167	if (err && err != -ENOENT)
	168	break;
d624c96f JK	169	next:
	170	/* check next segment */
	171	blkaddr = next_blkaddr_of_node(page);
d624c96f	172	}
d624c96f	173	unlock_page(page);
393ff91f	174	out:
d624c96f JK	175	__free_pages(page, 0);
	176	return err;
	177	}
	178
	179	static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi,
	180	struct list_head *head)
	181	{
d8b79b2f DC	182	struct fsync_inode_entry entry, tmp;
	183
	184	list_for_each_entry_safe(entry, tmp, head, list) {
d624c96f JK	185	iput(entry->inode);
	186	list_del(&entry->list);
	187	kmem_cache_free(fsync_entry_slab, entry);
	188	}
	189	}
	190
	191	static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
	192	block_t blkaddr)
	193	{
	194	struct seg_entry *sentry;
	195	unsigned int segno = GET_SEGNO(sbi, blkaddr);
	196	unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
	197	(sbi->blocks_per_seg - 1);
	198	struct f2fs_summary sum;
	199	nid_t ino;
	200	void *kaddr;
	201	struct inode *inode;
	202	struct page *node_page;
	203	block_t bidx;
	204	int i;
	205
	206	sentry = get_seg_entry(sbi, segno);
	207	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
	208	return;
	209
	210	/* Get the previous summary */
	211	for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
	212	struct curseg_info *curseg = CURSEG_I(sbi, i);
	213	if (curseg->segno == segno) {
	214	sum = curseg->sum_blk->entries[blkoff];
	215	break;
	216	}
	217	}
	218	if (i > CURSEG_COLD_DATA) {
	219	struct page *sum_page = get_sum_page(sbi, segno);
	220	struct f2fs_summary_block *sum_node;
	221	kaddr = page_address(sum_page);
	222	sum_node = (struct f2fs_summary_block *)kaddr;
	223	sum = sum_node->entries[blkoff];
	224	f2fs_put_page(sum_page, 1);
	225	}
	226
	227	/* Get the node page */
	228	node_page = get_node_page(sbi, le32_to_cpu(sum.nid));
	229	bidx = start_bidx_of_node(ofs_of_node(node_page)) +
	230	le16_to_cpu(sum.ofs_in_node);
	231	ino = ino_of_node(node_page);
	232	f2fs_put_page(node_page, 1);
	233
	234	/* Deallocate previous index in the node page */
d4686d56	235	inode = f2fs_iget(sbi->sb, ino);
06025f4d NJ	236	if (IS_ERR(inode))
	237	return;
	238
d624c96f JK	239	truncate_hole(inode, bidx, bidx + 1);
	240	iput(inode);
	241	}
	242
6ead1142	243	static int do_recover_data(struct f2fs_sb_info sbi, struct inode inode,
d624c96f JK	244	struct page *page, block_t blkaddr)
	245	{
	246	unsigned int start, end;
	247	struct dnode_of_data dn;
	248	struct f2fs_summary sum;
	249	struct node_info ni;
f356fe0c	250	int err = 0, recovered = 0;
39936837	251	int ilock;
d624c96f JK	252
	253	start = start_bidx_of_node(ofs_of_node(page));
	254	if (IS_INODE(page))
	255	end = start + ADDRS_PER_INODE;
	256	else
	257	end = start + ADDRS_PER_BLOCK;
	258
39936837	259	ilock = mutex_lock_op(sbi);
d624c96f	260	set_new_dnode(&dn, inode, NULL, NULL, 0);
39936837	261
6ead1142	262	err = get_dnode_of_data(&dn, start, ALLOC_NODE);
39936837 JK	263	if (err) {
39936837 JK	264	mutex_unlock_op(sbi, ilock);
6ead1142	265	return err;
39936837	266	}
d624c96f JK	267
	268	wait_on_page_writeback(dn.node_page);
	269
	270	get_node_info(sbi, dn.nid, &ni);
	271	BUG_ON(ni.ino != ino_of_node(page));
	272	BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));
	273
	274	for (; start < end; start++) {
	275	block_t src, dest;
	276
	277	src = datablock_addr(dn.node_page, dn.ofs_in_node);
	278	dest = datablock_addr(page, dn.ofs_in_node);
	279
	280	if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
	281	if (src == NULL_ADDR) {
	282	int err = reserve_new_block(&dn);
	283	/* We should not get -ENOSPC */
	284	BUG_ON(err);
	285	}
	286
	287	/* Check the previous node page having this index */
	288	check_index_in_prev_nodes(sbi, dest);
	289
	290	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
	291
	292	/* write dummy data page */
	293	recover_data_page(sbi, NULL, &sum, src, dest);
	294	update_extent_cache(dest, &dn);
f356fe0c	295	recovered++;
d624c96f JK	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);
f356fe0c JK	313
	314	f2fs_msg(sbi->sb, KERN_NOTICE, "recover_data: ino = %lx, "
	315	"recovered_data = %d blocks",
	316	inode->i_ino, recovered);
6ead1142	317	return 0;
d624c96f JK	318	}
d624c96f JK	319
6ead1142	320	static int recover_data(struct f2fs_sb_info *sbi,
d624c96f JK	321	struct list_head *head, int type)
	322	{
	323	unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver);
	324	struct curseg_info *curseg;
	325	struct page *page;
6ead1142	326	int err = 0;
d624c96f JK	327	block_t blkaddr;
	328
	329	/* get node pages in the current segment */
	330	curseg = CURSEG_I(sbi, type);
	331	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
	332
	333	/* read node page */
	334	page = alloc_page(GFP_NOFS \| __GFP_ZERO);
	335	if (IS_ERR(page))
6ead1142 JK	336	return -ENOMEM;
6ead1142 JK	337
d624c96f JK	338	lock_page(page);
	339
	340	while (1) {
	341	struct fsync_inode_entry *entry;
	342
6ead1142 JK	343	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
6ead1142 JK	344	if (err)
d624c96f JK	345	goto out;
d624c96f JK	346
393ff91f JK	347	lock_page(page);
393ff91f JK	348
d624c96f	349	if (cp_ver != cpver_of_node(page))
45856aff	350	break;
d624c96f JK	351
	352	entry = get_fsync_inode(head, ino_of_node(page));
	353	if (!entry)
	354	goto next;
	355
6ead1142 JK	356	err = do_recover_data(sbi, entry->inode, page, blkaddr);
6ead1142 JK	357	if (err)
45856aff	358	break;
d624c96f JK	359
	360	if (entry->blkaddr == blkaddr) {
	361	iput(entry->inode);
	362	list_del(&entry->list);
	363	kmem_cache_free(fsync_entry_slab, entry);
	364	}
	365	next:
	366	/* check next segment */
	367	blkaddr = next_blkaddr_of_node(page);
d624c96f	368	}
d624c96f	369	unlock_page(page);
393ff91f	370	out:
d624c96f JK	371	__free_pages(page, 0);
d624c96f JK	372
6ead1142 JK	373	if (!err)
	374	allocate_new_segments(sbi);
	375	return err;
d624c96f JK	376	}
d624c96f JK	377
6ead1142	378	int recover_fsync_data(struct f2fs_sb_info *sbi)
d624c96f JK	379	{
d624c96f JK	380	struct list_head inode_list;
6ead1142	381	int err;
d624c96f JK	382
	383	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
	384	sizeof(struct fsync_inode_entry), NULL);
	385	if (unlikely(!fsync_entry_slab))
6ead1142	386	return -ENOMEM;
d624c96f JK	387
	388	INIT_LIST_HEAD(&inode_list);
	389
	390	/* step #1: find fsynced inode numbers */
8c26d7d5	391	sbi->por_doing = 1;
6ead1142 JK	392	err = find_fsync_dnodes(sbi, &inode_list);
6ead1142 JK	393	if (err)
d624c96f JK	394	goto out;
	395
	396	if (list_empty(&inode_list))
	397	goto out;
	398
	399	/* step #2: recover data */
6ead1142	400	err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
d624c96f JK	401	BUG_ON(!list_empty(&inode_list));
	402	out:
	403	destroy_fsync_dnodes(sbi, &inode_list);
	404	kmem_cache_destroy(fsync_entry_slab);
8c26d7d5	405	sbi->por_doing = 0;
2c2c149f JK	406	if (!err)
2c2c149f JK	407	write_checkpoint(sbi, false);
6ead1142	408	return err;
d624c96f	409	}