[deliverable/linux.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 = F2FS_NODE(ipage);
	struct f2fs_inode *raw_inode = &(raw_node->i);
	nid_t pino = le32_to_cpu(raw_inode->i_pino);
	struct f2fs_dir_entry *de;
	struct qstr name;
	struct page *page;
	struct inode *dir, *einode;
	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);
		add_dirty_dir_inode(dir);
	}

	name.len = le32_to_cpu(raw_inode->i_namelen);
	name.name = raw_inode->i_name;
retry:
	de = f2fs_find_entry(dir, &name, &page);
	if (de && inode->i_ino == le32_to_cpu(de->ino)) {
		kunmap(page);
		f2fs_put_page(page, 0);
		goto out;
	}
	if (de) {
		einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
		if (IS_ERR(einode)) {
			WARN_ON(1);
			if (PTR_ERR(einode) == -ENOENT)
				err = -EEXIST;
			goto out;
		}
		f2fs_delete_entry(de, page, einode);
		iput(einode);
		goto retry;
	}
	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,
			IS_ERR(dir) ? 0 : dir->i_ino, err);
	return err;
}

static int recover_inode(struct inode *inode, struct page *node_page)
{
	struct f2fs_node *raw_node = F2FS_NODE(node_page);
	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 = cur_cp_version(F2FS_CKPT(sbi));
	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 (!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;

		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 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 int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
			block_t blkaddr, struct dnode_of_data *dn)
{
	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, nid;
	void *kaddr;
	struct inode *inode;
	struct page *node_page;
	unsigned int offset;
	block_t bidx;
	int i;

	sentry = get_seg_entry(sbi, segno);
	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
		return 0;

	/* 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);
	}

	/* Use the locked dnode page and inode */
	nid = le32_to_cpu(sum.nid);
	if (dn->inode->i_ino == nid) {
		struct dnode_of_data tdn = *dn;
		tdn.nid = nid;
		tdn.node_page = dn->inode_page;
		tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
		truncate_data_blocks_range(&tdn, 1);
		return 0;
	} else if (dn->nid == nid) {
		struct dnode_of_data tdn = *dn;
		tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
		truncate_data_blocks_range(&tdn, 1);
		return 0;
	}

	/* Get the node page */
	node_page = get_node_page(sbi, nid);
	if (IS_ERR(node_page))
		return PTR_ERR(node_page);

	offset = ofs_of_node(node_page);
	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 PTR_ERR(inode);

	bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
					le16_to_cpu(sum.ofs_in_node);

	truncate_hole(inode, bidx, bidx + 1);
	iput(inode);
	return 0;
}

static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
					struct page *page, block_t blkaddr)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	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), fi);
	if (IS_INODE(page))
		end = start + ADDRS_PER_INODE(fi);
	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 */
			err = check_index_in_prev_nodes(sbi, dest, &dn);
			if (err)
				goto err;

			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);
err:
	f2fs_put_dnode(&dn);
	mutex_unlock_op(sbi, ilock);

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

static int recover_data(struct f2fs_sb_info *sbi,
				struct list_head *head, int type)
{
	unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
	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 (!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(&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	{
45590710	43	struct f2fs_node *raw_node = F2FS_NODE(ipage);
d624c96f	44	struct f2fs_inode *raw_inode = &(raw_node->i);
74d0b917	45	nid_t pino = le32_to_cpu(raw_inode->i_pino);
6b8213d9	46	struct f2fs_dir_entry *de;
b7f7a5e0	47	struct qstr name;
d624c96f	48	struct page *page;
6b8213d9	49	struct inode dir, einode;
d624c96f JK	50	int err = 0;
d624c96f JK	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);
5deb8267	60	add_dirty_dir_inode(dir);
d624c96f JK	61	}
d624c96f JK	62
b7f7a5e0 AV	63	name.len = le32_to_cpu(raw_inode->i_namelen);
b7f7a5e0 AV	64	name.name = raw_inode->i_name;
6b8213d9 JK	65	retry:
	66	de = f2fs_find_entry(dir, &name, &page);
	67	if (de && inode->i_ino == le32_to_cpu(de->ino)) {
d624c96f JK	68	kunmap(page);
d624c96f JK	69	f2fs_put_page(page, 0);
6b8213d9 JK	70	goto out;
	71	}
	72	if (de) {
	73	einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
	74	if (IS_ERR(einode)) {
	75	WARN_ON(1);
	76	if (PTR_ERR(einode) == -ENOENT)
	77	err = -EEXIST;
	78	goto out;
	79	}
	80	f2fs_delete_entry(de, page, einode);
	81	iput(einode);
	82	goto retry;
d624c96f	83	}
6b8213d9	84	err = __f2fs_add_link(dir, &name, inode);
d624c96f	85	out:
f356fe0c JK	86	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
f356fe0c JK	87	"ino = %x, name = %s, dir = %lx, err = %d",
f28c06fa DC	88	ino_of_node(ipage), raw_inode->i_name,
f28c06fa DC	89	IS_ERR(dir) ? 0 : dir->i_ino, err);
d624c96f JK	90	return err;
	91	}
	92
	93	static int recover_inode(struct inode inode, struct page node_page)
	94	{
45590710	95	struct f2fs_node *raw_node = F2FS_NODE(node_page);
d624c96f JK	96	struct f2fs_inode *raw_inode = &(raw_node->i);
d624c96f JK	97
f356fe0c JK	98	if (!IS_INODE(node_page))
	99	return 0;
	100
25ca923b	101	inode->i_mode = le16_to_cpu(raw_inode->i_mode);
d624c96f JK	102	i_size_write(inode, le64_to_cpu(raw_inode->i_size));
	103	inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	104	inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
	105	inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
	106	inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	107	inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
	108	inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
	109
f356fe0c JK	110	if (is_dent_dnode(node_page))
	111	return recover_dentry(node_page, inode);
	112
	113	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
	114	ino_of_node(node_page), raw_inode->i_name);
	115	return 0;
d624c96f JK	116	}
	117
	118	static int find_fsync_dnodes(struct f2fs_sb_info sbi, struct list_head head)
	119	{
d71b5564	120	unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
d624c96f JK	121	struct curseg_info *curseg;
	122	struct page *page;
	123	block_t blkaddr;
	124	int err = 0;
	125
	126	/* get node pages in the current segment */
	127	curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
	128	blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff;
	129
	130	/* read node page */
	131	page = alloc_page(GFP_F2FS_ZERO);
e27dae4d DC	132	if (!page)
e27dae4d DC	133	return -ENOMEM;
d624c96f JK	134	lock_page(page);
	135
	136	while (1) {
	137	struct fsync_inode_entry *entry;
	138
393ff91f JK	139	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
393ff91f JK	140	if (err)
d624c96f JK	141	goto out;
d624c96f JK	142
393ff91f JK	143	lock_page(page);
393ff91f JK	144
6ead1142	145	if (cp_ver != cpver_of_node(page))
f356fe0c	146	break;
d624c96f JK	147
	148	if (!is_fsync_dnode(page))
	149	goto next;
	150
	151	entry = get_fsync_inode(head, ino_of_node(page));
	152	if (entry) {
d624c96f JK	153	if (IS_INODE(page) && is_dent_dnode(page))
	154	set_inode_flag(F2FS_I(entry->inode),
	155	FI_INC_LINK);
	156	} else {
	157	if (IS_INODE(page) && is_dent_dnode(page)) {
6ead1142 JK	158	err = recover_inode_page(sbi, page);
6ead1142 JK	159	if (err)
f356fe0c	160	break;
d624c96f JK	161	}
	162
	163	/* add this fsync inode to the list */
	164	entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS);
	165	if (!entry) {
	166	err = -ENOMEM;
f356fe0c	167	break;
d624c96f JK	168	}
d624c96f JK	169
d624c96f JK	170	entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
	171	if (IS_ERR(entry->inode)) {
	172	err = PTR_ERR(entry->inode);
fd8bb65f	173	kmem_cache_free(fsync_entry_slab, entry);
f356fe0c	174	break;
d624c96f	175	}
fd8bb65f	176	list_add_tail(&entry->list, head);
d624c96f	177	}
addbe45b JK	178	entry->blkaddr = blkaddr;
addbe45b JK	179
f356fe0c JK	180	err = recover_inode(entry->inode, page);
	181	if (err && err != -ENOENT)
	182	break;
d624c96f JK	183	next:
	184	/* check next segment */
	185	blkaddr = next_blkaddr_of_node(page);
d624c96f	186	}
d624c96f	187	unlock_page(page);
393ff91f	188	out:
d624c96f JK	189	__free_pages(page, 0);
	190	return err;
	191	}
	192
5ebefc5b	193	static void destroy_fsync_dnodes(struct list_head *head)
d624c96f	194	{
d8b79b2f DC	195	struct fsync_inode_entry entry, tmp;
	196
	197	list_for_each_entry_safe(entry, tmp, head, list) {
d624c96f JK	198	iput(entry->inode);
	199	list_del(&entry->list);
	200	kmem_cache_free(fsync_entry_slab, entry);
	201	}
	202	}
	203
39cf72cf	204	static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
b292dcab	205	block_t blkaddr, struct dnode_of_data *dn)
d624c96f JK	206	{
	207	struct seg_entry *sentry;
	208	unsigned int segno = GET_SEGNO(sbi, blkaddr);
	209	unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) &
	210	(sbi->blocks_per_seg - 1);
	211	struct f2fs_summary sum;
b292dcab	212	nid_t ino, nid;
d624c96f JK	213	void *kaddr;
	214	struct inode *inode;
	215	struct page *node_page;
de93653f	216	unsigned int offset;
d624c96f JK	217	block_t bidx;
	218	int i;
	219
	220	sentry = get_seg_entry(sbi, segno);
	221	if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
39cf72cf	222	return 0;
d624c96f JK	223
	224	/* Get the previous summary */
	225	for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
	226	struct curseg_info *curseg = CURSEG_I(sbi, i);
	227	if (curseg->segno == segno) {
	228	sum = curseg->sum_blk->entries[blkoff];
	229	break;
	230	}
	231	}
	232	if (i > CURSEG_COLD_DATA) {
	233	struct page *sum_page = get_sum_page(sbi, segno);
	234	struct f2fs_summary_block *sum_node;
	235	kaddr = page_address(sum_page);
	236	sum_node = (struct f2fs_summary_block *)kaddr;
	237	sum = sum_node->entries[blkoff];
	238	f2fs_put_page(sum_page, 1);
	239	}
	240
b292dcab JK	241	/* Use the locked dnode page and inode */
	242	nid = le32_to_cpu(sum.nid);
	243	if (dn->inode->i_ino == nid) {
	244	struct dnode_of_data tdn = *dn;
	245	tdn.nid = nid;
	246	tdn.node_page = dn->inode_page;
060dd67b	247	tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
b292dcab	248	truncate_data_blocks_range(&tdn, 1);
39cf72cf	249	return 0;
b292dcab JK	250	} else if (dn->nid == nid) {
b292dcab JK	251	struct dnode_of_data tdn = *dn;
060dd67b	252	tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
b292dcab	253	truncate_data_blocks_range(&tdn, 1);
39cf72cf	254	return 0;
b292dcab JK	255	}
b292dcab JK	256
d624c96f	257	/* Get the node page */
b292dcab	258	node_page = get_node_page(sbi, nid);
39cf72cf JK	259	if (IS_ERR(node_page))
39cf72cf JK	260	return PTR_ERR(node_page);
de93653f JK	261
de93653f JK	262	offset = ofs_of_node(node_page);
d624c96f JK	263	ino = ino_of_node(node_page);
	264	f2fs_put_page(node_page, 1);
	265
	266	/* Deallocate previous index in the node page */
d4686d56	267	inode = f2fs_iget(sbi->sb, ino);
06025f4d	268	if (IS_ERR(inode))
39cf72cf	269	return PTR_ERR(inode);
06025f4d	270
de93653f JK	271	bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
	272	le16_to_cpu(sum.ofs_in_node);
	273
d624c96f JK	274	truncate_hole(inode, bidx, bidx + 1);
d624c96f JK	275	iput(inode);
39cf72cf	276	return 0;
d624c96f JK	277	}
d624c96f JK	278
6ead1142	279	static int do_recover_data(struct f2fs_sb_info sbi, struct inode inode,
d624c96f JK	280	struct page *page, block_t blkaddr)
d624c96f JK	281	{
de93653f	282	struct f2fs_inode_info *fi = F2FS_I(inode);
d624c96f JK	283	unsigned int start, end;
	284	struct dnode_of_data dn;
	285	struct f2fs_summary sum;
	286	struct node_info ni;
f356fe0c	287	int err = 0, recovered = 0;
39936837	288	int ilock;
d624c96f	289
de93653f	290	start = start_bidx_of_node(ofs_of_node(page), fi);
d624c96f	291	if (IS_INODE(page))
de93653f	292	end = start + ADDRS_PER_INODE(fi);
d624c96f JK	293	else
	294	end = start + ADDRS_PER_BLOCK;
	295
39936837	296	ilock = mutex_lock_op(sbi);
d624c96f	297	set_new_dnode(&dn, inode, NULL, NULL, 0);
39936837	298
6ead1142	299	err = get_dnode_of_data(&dn, start, ALLOC_NODE);
39936837 JK	300	if (err) {
39936837 JK	301	mutex_unlock_op(sbi, ilock);
6ead1142	302	return err;
39936837	303	}
d624c96f JK	304
	305	wait_on_page_writeback(dn.node_page);
	306
	307	get_node_info(sbi, dn.nid, &ni);
	308	BUG_ON(ni.ino != ino_of_node(page));
	309	BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page));
	310
	311	for (; start < end; start++) {
	312	block_t src, dest;
	313
	314	src = datablock_addr(dn.node_page, dn.ofs_in_node);
	315	dest = datablock_addr(page, dn.ofs_in_node);
	316
	317	if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) {
	318	if (src == NULL_ADDR) {
	319	int err = reserve_new_block(&dn);
	320	/* We should not get -ENOSPC */
	321	BUG_ON(err);
	322	}
	323
	324	/* Check the previous node page having this index */
39cf72cf JK	325	err = check_index_in_prev_nodes(sbi, dest, &dn);
	326	if (err)
	327	goto err;
d624c96f JK	328
	329	set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
	330
	331	/* write dummy data page */
	332	recover_data_page(sbi, NULL, &sum, src, dest);
	333	update_extent_cache(dest, &dn);
f356fe0c	334	recovered++;
d624c96f JK	335	}
	336	dn.ofs_in_node++;
	337	}
	338
	339	/* write node page in place */
	340	set_summary(&sum, dn.nid, 0, 0);
	341	if (IS_INODE(dn.node_page))
	342	sync_inode_page(&dn);
	343
	344	copy_node_footer(dn.node_page, page);
	345	fill_node_footer(dn.node_page, dn.nid, ni.ino,
	346	ofs_of_node(page), false);
	347	set_page_dirty(dn.node_page);
	348
	349	recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr);
39cf72cf	350	err:
d624c96f	351	f2fs_put_dnode(&dn);
39936837	352	mutex_unlock_op(sbi, ilock);
f356fe0c JK	353
f356fe0c JK	354	f2fs_msg(sbi->sb, KERN_NOTICE, "recover_data: ino = %lx, "
39cf72cf JK	355	"recovered_data = %d blocks, err = %d",
	356	inode->i_ino, recovered, err);
	357	return err;
d624c96f JK	358	}
d624c96f JK	359
6ead1142	360	static int recover_data(struct f2fs_sb_info *sbi,
d624c96f JK	361	struct list_head *head, int type)
d624c96f JK	362	{
d71b5564	363	unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
d624c96f JK	364	struct curseg_info *curseg;
d624c96f JK	365	struct page *page;
6ead1142	366	int err = 0;
d624c96f JK	367	block_t blkaddr;
	368
	369	/* get node pages in the current segment */
	370	curseg = CURSEG_I(sbi, type);
	371	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
	372
	373	/* read node page */
	374	page = alloc_page(GFP_NOFS \| __GFP_ZERO);
e27dae4d	375	if (!page)
6ead1142 JK	376	return -ENOMEM;
6ead1142 JK	377
d624c96f JK	378	lock_page(page);
	379
	380	while (1) {
	381	struct fsync_inode_entry *entry;
	382
6ead1142 JK	383	err = f2fs_readpage(sbi, page, blkaddr, READ_SYNC);
6ead1142 JK	384	if (err)
d624c96f JK	385	goto out;
d624c96f JK	386
393ff91f JK	387	lock_page(page);
393ff91f JK	388
d624c96f	389	if (cp_ver != cpver_of_node(page))
45856aff	390	break;
d624c96f JK	391
	392	entry = get_fsync_inode(head, ino_of_node(page));
	393	if (!entry)
	394	goto next;
	395
6ead1142 JK	396	err = do_recover_data(sbi, entry->inode, page, blkaddr);
6ead1142 JK	397	if (err)
45856aff	398	break;
d624c96f JK	399
	400	if (entry->blkaddr == blkaddr) {
	401	iput(entry->inode);
	402	list_del(&entry->list);
	403	kmem_cache_free(fsync_entry_slab, entry);
	404	}
	405	next:
	406	/* check next segment */
	407	blkaddr = next_blkaddr_of_node(page);
d624c96f	408	}
d624c96f	409	unlock_page(page);
393ff91f	410	out:
d624c96f JK	411	__free_pages(page, 0);
d624c96f JK	412
6ead1142 JK	413	if (!err)
	414	allocate_new_segments(sbi);
	415	return err;
d624c96f JK	416	}
d624c96f JK	417
6ead1142	418	int recover_fsync_data(struct f2fs_sb_info *sbi)
d624c96f JK	419	{
d624c96f JK	420	struct list_head inode_list;
6ead1142	421	int err;
d624c96f JK	422
	423	fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
	424	sizeof(struct fsync_inode_entry), NULL);
	425	if (unlikely(!fsync_entry_slab))
6ead1142	426	return -ENOMEM;
d624c96f JK	427
	428	INIT_LIST_HEAD(&inode_list);
	429
	430	/* step #1: find fsynced inode numbers */
8c26d7d5	431	sbi->por_doing = 1;
6ead1142 JK	432	err = find_fsync_dnodes(sbi, &inode_list);
6ead1142 JK	433	if (err)
d624c96f JK	434	goto out;
	435
	436	if (list_empty(&inode_list))
	437	goto out;
	438
	439	/* step #2: recover data */
6ead1142	440	err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
d624c96f JK	441	BUG_ON(!list_empty(&inode_list));
d624c96f JK	442	out:
5ebefc5b	443	destroy_fsync_dnodes(&inode_list);
d624c96f	444	kmem_cache_destroy(fsync_entry_slab);
8c26d7d5	445	sbi->por_doing = 0;
2c2c149f JK	446	if (!err)
2c2c149f JK	447	write_checkpoint(sbi, false);
6ead1142	448	return err;
d624c96f	449	}