fs/f2fs/inline.c - kernel/msm-4.9 - Gitiles

 /*
  * fs/f2fs/inline.c
  * Copyright (c) 2013, Intel Corporation
  * Authors: Huajun Li <huajun.li@intel.com>
  *          Haicheng Li <haicheng.li@intel.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"

 bool f2fs_may_inline(struct inode *inode)
 {
 	block_t nr_blocks;
 	loff_t i_size;

 	if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
 		return false;

 	if (f2fs_is_atomic_file(inode))
 		return false;

 	nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
 	if (inode->i_blocks > nr_blocks)
 		return false;

 	i_size = i_size_read(inode);
 	if (i_size > MAX_INLINE_DATA)
 		return false;

 	return true;
 }

 int f2fs_read_inline_data(struct inode *inode, struct page *page)
 {
 	struct page *ipage;
 	void *src_addr, *dst_addr;

 	if (page->index) {
 		zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 		goto out;
 	}

 	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	if (IS_ERR(ipage)) {
 		unlock_page(page);
 		return PTR_ERR(ipage);
 	}

 	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);

 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(ipage);
 	dst_addr = kmap(page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 	kunmap(page);
 	f2fs_put_page(ipage, 1);

 out:
 	SetPageUptodate(page);
 	unlock_page(page);

 	return 0;
 }

 static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
 {
 	int err = 0;
 	struct page *ipage;
 	struct dnode_of_data dn;
 	void *src_addr, *dst_addr;
 	block_t new_blk_addr;
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct f2fs_io_info fio = {
 		.type = DATA,
 		.rw = WRITE_SYNC | REQ_PRIO,
 	};

 	f2fs_lock_op(sbi);
 	ipage = get_node_page(sbi, inode->i_ino);
 	if (IS_ERR(ipage)) {
 		err = PTR_ERR(ipage);
 		goto out;
 	}

 	/* someone else converted inline_data already */
 	if (!f2fs_has_inline_data(inode))
 		goto out;

 	/*
 	 * i_addr[0] is not used for inline data,
 	 * so reserving new block will not destroy inline data
 	 */
 	set_new_dnode(&dn, inode, ipage, NULL, 0);
 	err = f2fs_reserve_block(&dn, 0);
 	if (err)
 		goto out;

 	f2fs_wait_on_page_writeback(page, DATA);
 	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);

 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(ipage);
 	dst_addr = kmap(page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 	kunmap(page);
 	SetPageUptodate(page);

 	/* write data page to try to make data consistent */
 	set_page_writeback(page);
 	write_data_page(page, &dn, &new_blk_addr, &fio);
 	update_extent_cache(new_blk_addr, &dn);
 	f2fs_wait_on_page_writeback(page, DATA);

 	/* clear inline data and flag after data writeback */
 	zero_user_segment(ipage, INLINE_DATA_OFFSET,
 				 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 	clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 	stat_dec_inline_inode(inode);

 	sync_inode_page(&dn);
 	f2fs_put_dnode(&dn);
 out:
 	f2fs_unlock_op(sbi);
 	return err;
 }

 int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
 						struct page *page)
 {
 	struct page *new_page = page;
 	int err;

 	if (!f2fs_has_inline_data(inode))
 		return 0;
 	else if (to_size <= MAX_INLINE_DATA)
 		return 0;

 	if (!page || page->index != 0) {
 		new_page = grab_cache_page(inode->i_mapping, 0);
 		if (!new_page)
 			return -ENOMEM;
 	}

 	err = __f2fs_convert_inline_data(inode, new_page);
 	if (!page || page->index != 0)
 		f2fs_put_page(new_page, 1);
 	return err;
 }

 int f2fs_write_inline_data(struct inode *inode,
 				struct page *page, unsigned size)
 {
 	void *src_addr, *dst_addr;
 	struct page *ipage;
 	struct dnode_of_data dn;
 	int err;

 	set_new_dnode(&dn, inode, NULL, NULL, 0);
 	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 	if (err)
 		return err;
 	ipage = dn.inode_page;

 	/* Release any data block if it is allocated */
 	if (!f2fs_has_inline_data(inode)) {
 		int count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 		truncate_data_blocks_range(&dn, count);
 		set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 		stat_inc_inline_inode(inode);
 	}

 	f2fs_wait_on_page_writeback(ipage, NODE);
 	zero_user_segment(ipage, INLINE_DATA_OFFSET,
 				 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 	src_addr = kmap(page);
 	dst_addr = inline_data_addr(ipage);
 	memcpy(dst_addr, src_addr, size);
 	kunmap(page);

 	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 	sync_inode_page(&dn);
 	f2fs_put_dnode(&dn);

 	return 0;
 }

 void truncate_inline_data(struct inode *inode, u64 from)
 {
 	struct page *ipage;

 	if (from >= MAX_INLINE_DATA)
 		return;

 	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	if (IS_ERR(ipage))
 		return;

 	f2fs_wait_on_page_writeback(ipage, NODE);

 	zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
 				INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 	set_page_dirty(ipage);
 	f2fs_put_page(ipage, 1);
 }

 bool recover_inline_data(struct inode *inode, struct page *npage)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct f2fs_inode *ri = NULL;
 	void *src_addr, *dst_addr;
 	struct page *ipage;

 	/*
 	 * The inline_data recovery policy is as follows.
 	 * [prev.] [next] of inline_data flag
 	 *    o       o  -> recover inline_data
 	 *    o       x  -> remove inline_data, and then recover data blocks
 	 *    x       o  -> remove inline_data, and then recover inline_data
 	 *    x       x  -> recover data blocks
 	 */
 	if (IS_INODE(npage))
 		ri = F2FS_INODE(npage);

 	if (f2fs_has_inline_data(inode) &&
 			ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 process_inline:
 		ipage = get_node_page(sbi, inode->i_ino);
 		f2fs_bug_on(sbi, IS_ERR(ipage));

 		f2fs_wait_on_page_writeback(ipage, NODE);

 		src_addr = inline_data_addr(npage);
 		dst_addr = inline_data_addr(ipage);
 		memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 		update_inode(inode, ipage);
 		f2fs_put_page(ipage, 1);
 		return true;
 	}

 	if (f2fs_has_inline_data(inode)) {
 		ipage = get_node_page(sbi, inode->i_ino);
 		f2fs_bug_on(sbi, IS_ERR(ipage));
 		f2fs_wait_on_page_writeback(ipage, NODE);
 		zero_user_segment(ipage, INLINE_DATA_OFFSET,
 				 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 		clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 		update_inode(inode, ipage);
 		f2fs_put_page(ipage, 1);
 	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 		truncate_blocks(inode, 0, false);
 		set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 		goto process_inline;
 	}
 	return false;
 }

 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 				struct qstr *name, struct page **res_page)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct f2fs_inline_dentry *inline_dentry;
 	struct f2fs_dir_entry *de;
 	struct page *ipage;
 	int max_slots = NR_INLINE_DENTRY;

 	ipage = get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return NULL;

 	inline_dentry = inline_data_addr(ipage);

 	de = find_target_dentry(name, &max_slots, &inline_dentry->dentry_bitmap,
 						inline_dentry->dentry,
 						inline_dentry->filename);
 	unlock_page(ipage);
 	if (de)
 		*res_page = ipage;
 	else
 		f2fs_put_page(ipage, 0);

 	/*
 	 * For the most part, it should be a bug when name_len is zero.
 	 * We stop here for figuring out where the bugs has occurred.
 	 */
 	f2fs_bug_on(sbi, max_slots < 0);
 	return de;
 }

 struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
 							struct page **p)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	struct f2fs_dir_entry *de;
 	struct f2fs_inline_dentry *dentry_blk;

 	ipage = get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return NULL;

 	dentry_blk = inline_data_addr(ipage);
 	de = &dentry_blk->dentry[1];
 	*p = ipage;
 	unlock_page(ipage);
 	return de;
 }

 int make_empty_inline_dir(struct inode *inode, struct inode *parent,
 							struct page *ipage)
 {
 	struct f2fs_inline_dentry *dentry_blk;
 	struct f2fs_dir_entry *de;

 	dentry_blk = inline_data_addr(ipage);

 	de = &dentry_blk->dentry[0];
 	de->name_len = cpu_to_le16(1);
 	de->hash_code = 0;
 	de->ino = cpu_to_le32(inode->i_ino);
 	memcpy(dentry_blk->filename[0], ".", 1);
 	set_de_type(de, inode);

 	de = &dentry_blk->dentry[1];
 	de->hash_code = 0;
 	de->name_len = cpu_to_le16(2);
 	de->ino = cpu_to_le32(parent->i_ino);
 	memcpy(dentry_blk->filename[1], "..", 2);
 	set_de_type(de, inode);

 	test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
 	test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);

 	set_page_dirty(ipage);

 	/* update i_size to MAX_INLINE_DATA */
 	if (i_size_read(inode) < MAX_INLINE_DATA) {
 		i_size_write(inode, MAX_INLINE_DATA);
 		set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
 	}
 	return 0;
 }

 int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 				struct f2fs_inline_dentry *inline_dentry)
 {
 	struct page *page;
 	struct dnode_of_data dn;
 	struct f2fs_dentry_block *dentry_blk;
 	int err;

 	page = grab_cache_page(dir->i_mapping, 0);
 	if (!page)
 		return -ENOMEM;

 	set_new_dnode(&dn, dir, ipage, NULL, 0);
 	err = f2fs_reserve_block(&dn, 0);
 	if (err)
 		goto out;

 	f2fs_wait_on_page_writeback(page, DATA);
 	zero_user_segment(page, 0, PAGE_CACHE_SIZE);

 	dentry_blk = kmap(page);

 	/* copy data from inline dentry block to new dentry block */
 	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 					INLINE_DENTRY_BITMAP_SIZE);
 	memcpy(dentry_blk->dentry, inline_dentry->dentry,
 			sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
 	memcpy(dentry_blk->filename, inline_dentry->filename,
 					NR_INLINE_DENTRY * F2FS_SLOT_LEN);

 	kunmap(page);
 	SetPageUptodate(page);
 	set_page_dirty(page);

 	/* clear inline dir and flag after data writeback */
 	zero_user_segment(ipage, INLINE_DATA_OFFSET,
 				 INLINE_DATA_OFFSET + MAX_INLINE_DATA);
 	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
 	stat_dec_inline_inode(dir);

 	if (i_size_read(dir) < PAGE_CACHE_SIZE) {
 		i_size_write(dir, PAGE_CACHE_SIZE);
 		set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 	}

 	sync_inode_page(&dn);
 out:
 	f2fs_put_page(page, 1);
 	return err;
 }

 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
 						struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	unsigned int bit_pos;
 	f2fs_hash_t name_hash;
 	struct f2fs_dir_entry *de;
 	size_t namelen = name->len;
 	struct f2fs_inline_dentry *dentry_blk = NULL;
 	int slots = GET_DENTRY_SLOTS(namelen);
 	struct page *page;
 	int err = 0;
 	int i;

 	name_hash = f2fs_dentry_hash(name);

 	ipage = get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);

 	dentry_blk = inline_data_addr(ipage);
 	bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
 						slots, NR_INLINE_DENTRY);
 	if (bit_pos >= NR_INLINE_DENTRY) {
 		err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
 		if (!err)
 			err = -EAGAIN;
 		goto out;
 	}

 	down_write(&F2FS_I(inode)->i_sem);
 	page = init_inode_metadata(inode, dir, name, ipage);
 	if (IS_ERR(page)) {
 		err = PTR_ERR(page);
 		goto fail;
 	}

 	f2fs_wait_on_page_writeback(ipage, NODE);
 	de = &dentry_blk->dentry[bit_pos];
 	de->hash_code = name_hash;
 	de->name_len = cpu_to_le16(namelen);
 	memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
 	de->ino = cpu_to_le32(inode->i_ino);
 	set_de_type(de, inode);
 	for (i = 0; i < slots; i++)
 		test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
 	set_page_dirty(ipage);

 	/* we don't need to mark_inode_dirty now */
 	F2FS_I(inode)->i_pino = dir->i_ino;
 	update_inode(inode, page);
 	f2fs_put_page(page, 1);

 	update_parent_metadata(dir, inode, 0);
 fail:
 	up_write(&F2FS_I(inode)->i_sem);

 	if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
 		update_inode(dir, ipage);
 		clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
 	}
 out:
 	f2fs_put_page(ipage, 1);
 	return err;
 }

 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 					struct inode *dir, struct inode *inode)
 {
 	struct f2fs_inline_dentry *inline_dentry;
 	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 	unsigned int bit_pos;
 	int i;

 	lock_page(page);
 	f2fs_wait_on_page_writeback(page, NODE);

 	inline_dentry = inline_data_addr(page);
 	bit_pos = dentry - inline_dentry->dentry;
 	for (i = 0; i < slots; i++)
 		test_and_clear_bit_le(bit_pos + i,
 				&inline_dentry->dentry_bitmap);

 	set_page_dirty(page);

 	dir->i_ctime = dir->i_mtime = CURRENT_TIME;

 	if (inode)
 		f2fs_drop_nlink(dir, inode, page);

 	f2fs_put_page(page, 1);
 }

 bool f2fs_empty_inline_dir(struct inode *dir)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	unsigned int bit_pos = 2;
 	struct f2fs_inline_dentry *dentry_blk;

 	ipage = get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return false;

 	dentry_blk = inline_data_addr(ipage);
 	bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
 					NR_INLINE_DENTRY,
 					bit_pos);

 	f2fs_put_page(ipage, 1);

 	if (bit_pos < NR_INLINE_DENTRY)
 		return false;

 	return true;
 }

 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
 {
 	struct inode *inode = file_inode(file);
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	unsigned int bit_pos = 0;
 	struct f2fs_inline_dentry *inline_dentry = NULL;
 	struct f2fs_dir_entry *de = NULL;
 	struct page *ipage = NULL;
 	unsigned char d_type = DT_UNKNOWN;

 	if (ctx->pos == NR_INLINE_DENTRY)
 		return 0;

 	ipage = get_node_page(sbi, inode->i_ino);
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);

 	bit_pos = ((unsigned long)ctx->pos % NR_INLINE_DENTRY);

 	inline_dentry = inline_data_addr(ipage);
 	while (bit_pos < NR_INLINE_DENTRY) {
 		bit_pos = find_next_bit_le(&inline_dentry->dentry_bitmap,
 						NR_INLINE_DENTRY,
 						bit_pos);
 		if (bit_pos >= NR_INLINE_DENTRY)
 			break;

 		de = &inline_dentry->dentry[bit_pos];
 		if (de->file_type < F2FS_FT_MAX)
 			d_type = f2fs_filetype_table[de->file_type];
 		else
 			d_type = DT_UNKNOWN;

 		if (!dir_emit(ctx,
 				inline_dentry->filename[bit_pos],
 				le16_to_cpu(de->name_len),
 				le32_to_cpu(de->ino), d_type))
 			goto out;

 		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 		ctx->pos = bit_pos;
 	}

 	ctx->pos = NR_INLINE_DENTRY;
 out:
 	f2fs_put_page(ipage, 1);

 	return 0;
 }
	/*
	* fs/f2fs/inline.c
	* Copyright (c) 2013, Intel Corporation
	* Authors: Huajun Li <huajun.li@intel.com>
	* Haicheng Li <haicheng.li@intel.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"

	bool f2fs_may_inline(struct inode *inode)
	{
	block_t nr_blocks;
	loff_t i_size;

	if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
	return false;

	if (f2fs_is_atomic_file(inode))
	return false;

	nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
	if (inode->i_blocks > nr_blocks)
	return false;

	i_size = i_size_read(inode);
	if (i_size > MAX_INLINE_DATA)
	return false;

	return true;
	}

	int f2fs_read_inline_data(struct inode inode, struct page page)
	{
	struct page *ipage;
	void src_addr, dst_addr;

	if (page->index) {
	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
	goto out;
	}

	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ipage)) {
	unlock_page(page);
	return PTR_ERR(ipage);
	}

	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);

	/* Copy the whole inline data block */
	src_addr = inline_data_addr(ipage);
	dst_addr = kmap(page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	kunmap(page);
	f2fs_put_page(ipage, 1);

	out:
	SetPageUptodate(page);
	unlock_page(page);

	return 0;
	}

	static int __f2fs_convert_inline_data(struct inode inode, struct page page)
	{
	int err = 0;
	struct page *ipage;
	struct dnode_of_data dn;
	void src_addr, dst_addr;
	block_t new_blk_addr;
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct f2fs_io_info fio = {
	.type = DATA,
	.rw = WRITE_SYNC \| REQ_PRIO,
	};

	f2fs_lock_op(sbi);
	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
	err = PTR_ERR(ipage);
	goto out;
	}

	/* someone else converted inline_data already */
	if (!f2fs_has_inline_data(inode))
	goto out;

	/*
	* i_addr[0] is not used for inline data,
	* so reserving new block will not destroy inline data
	*/
	set_new_dnode(&dn, inode, ipage, NULL, 0);
	err = f2fs_reserve_block(&dn, 0);
	if (err)
	goto out;

	f2fs_wait_on_page_writeback(page, DATA);
	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);

	/* Copy the whole inline data block */
	src_addr = inline_data_addr(ipage);
	dst_addr = kmap(page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	kunmap(page);
	SetPageUptodate(page);

	/* write data page to try to make data consistent */
	set_page_writeback(page);
	write_data_page(page, &dn, &new_blk_addr, &fio);
	update_extent_cache(new_blk_addr, &dn);
	f2fs_wait_on_page_writeback(page, DATA);

	/* clear inline data and flag after data writeback */
	zero_user_segment(ipage, INLINE_DATA_OFFSET,
	INLINE_DATA_OFFSET + MAX_INLINE_DATA);
	clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	stat_dec_inline_inode(inode);

	sync_inode_page(&dn);
	f2fs_put_dnode(&dn);
	out:
	f2fs_unlock_op(sbi);
	return err;
	}

	int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
	struct page *page)
	{
	struct page *new_page = page;
	int err;

	if (!f2fs_has_inline_data(inode))
	return 0;
	else if (to_size <= MAX_INLINE_DATA)
	return 0;

	if (!page \|\| page->index != 0) {
	new_page = grab_cache_page(inode->i_mapping, 0);
	if (!new_page)
	return -ENOMEM;
	}

	err = __f2fs_convert_inline_data(inode, new_page);
	if (!page \|\| page->index != 0)
	f2fs_put_page(new_page, 1);
	return err;
	}

	int f2fs_write_inline_data(struct inode *inode,
	struct page *page, unsigned size)
	{
	void src_addr, dst_addr;
	struct page *ipage;
	struct dnode_of_data dn;
	int err;

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	if (err)
	return err;
	ipage = dn.inode_page;

	/* Release any data block if it is allocated */
	if (!f2fs_has_inline_data(inode)) {
	int count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
	truncate_data_blocks_range(&dn, count);
	set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	stat_inc_inline_inode(inode);
	}

	f2fs_wait_on_page_writeback(ipage, NODE);
	zero_user_segment(ipage, INLINE_DATA_OFFSET,
	INLINE_DATA_OFFSET + MAX_INLINE_DATA);
	src_addr = kmap(page);
	dst_addr = inline_data_addr(ipage);
	memcpy(dst_addr, src_addr, size);
	kunmap(page);

	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
	sync_inode_page(&dn);
	f2fs_put_dnode(&dn);

	return 0;
	}

	void truncate_inline_data(struct inode *inode, u64 from)
	{
	struct page *ipage;

	if (from >= MAX_INLINE_DATA)
	return;

	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ipage))
	return;

	f2fs_wait_on_page_writeback(ipage, NODE);

	zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
	INLINE_DATA_OFFSET + MAX_INLINE_DATA);
	set_page_dirty(ipage);
	f2fs_put_page(ipage, 1);
	}

	bool recover_inline_data(struct inode inode, struct page npage)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct f2fs_inode *ri = NULL;
	void src_addr, dst_addr;
	struct page *ipage;

	/*
	* The inline_data recovery policy is as follows.
	* [prev.] [next] of inline_data flag
	* o o -> recover inline_data
	* o x -> remove inline_data, and then recover data blocks
	* x o -> remove inline_data, and then recover inline_data
	* x x -> recover data blocks
	*/
	if (IS_INODE(npage))
	ri = F2FS_INODE(npage);

	if (f2fs_has_inline_data(inode) &&
	ri && (ri->i_inline & F2FS_INLINE_DATA)) {
	process_inline:
	ipage = get_node_page(sbi, inode->i_ino);
	f2fs_bug_on(sbi, IS_ERR(ipage));

	f2fs_wait_on_page_writeback(ipage, NODE);

	src_addr = inline_data_addr(npage);
	dst_addr = inline_data_addr(ipage);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	update_inode(inode, ipage);
	f2fs_put_page(ipage, 1);
	return true;
	}

	if (f2fs_has_inline_data(inode)) {
	ipage = get_node_page(sbi, inode->i_ino);
	f2fs_bug_on(sbi, IS_ERR(ipage));
	f2fs_wait_on_page_writeback(ipage, NODE);
	zero_user_segment(ipage, INLINE_DATA_OFFSET,
	INLINE_DATA_OFFSET + MAX_INLINE_DATA);
	clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	update_inode(inode, ipage);
	f2fs_put_page(ipage, 1);
	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
	truncate_blocks(inode, 0, false);
	set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	goto process_inline;
	}
	return false;
	}

	struct f2fs_dir_entry find_in_inline_dir(struct inode dir,
	struct qstr name, struct page *res_page)
	{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct f2fs_inline_dentry *inline_dentry;
	struct f2fs_dir_entry *de;
	struct page *ipage;
	int max_slots = NR_INLINE_DENTRY;

	ipage = get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return NULL;

	inline_dentry = inline_data_addr(ipage);

	de = find_target_dentry(name, &max_slots, &inline_dentry->dentry_bitmap,
	inline_dentry->dentry,
	inline_dentry->filename);
	unlock_page(ipage);
	if (de)
	*res_page = ipage;
	else
	f2fs_put_page(ipage, 0);

	/*
	* For the most part, it should be a bug when name_len is zero.
	* We stop here for figuring out where the bugs has occurred.
	*/
	f2fs_bug_on(sbi, max_slots < 0);
	return de;
	}

	struct f2fs_dir_entry f2fs_parent_inline_dir(struct inode dir,
	struct page **p)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	struct f2fs_dir_entry *de;
	struct f2fs_inline_dentry *dentry_blk;

	ipage = get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return NULL;

	dentry_blk = inline_data_addr(ipage);
	de = &dentry_blk->dentry[1];
	*p = ipage;
	unlock_page(ipage);
	return de;
	}

	int make_empty_inline_dir(struct inode inode, struct inode parent,
	struct page *ipage)
	{
	struct f2fs_inline_dentry *dentry_blk;
	struct f2fs_dir_entry *de;

	dentry_blk = inline_data_addr(ipage);

	de = &dentry_blk->dentry[0];
	de->name_len = cpu_to_le16(1);
	de->hash_code = 0;
	de->ino = cpu_to_le32(inode->i_ino);
	memcpy(dentry_blk->filename[0], ".", 1);
	set_de_type(de, inode);

	de = &dentry_blk->dentry[1];
	de->hash_code = 0;
	de->name_len = cpu_to_le16(2);
	de->ino = cpu_to_le32(parent->i_ino);
	memcpy(dentry_blk->filename[1], "..", 2);
	set_de_type(de, inode);

	test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
	test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);

	set_page_dirty(ipage);

	/* update i_size to MAX_INLINE_DATA */
	if (i_size_read(inode) < MAX_INLINE_DATA) {
	i_size_write(inode, MAX_INLINE_DATA);
	set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
	}
	return 0;
	}

	int f2fs_convert_inline_dir(struct inode dir, struct page ipage,
	struct f2fs_inline_dentry *inline_dentry)
	{
	struct page *page;
	struct dnode_of_data dn;
	struct f2fs_dentry_block *dentry_blk;
	int err;

	page = grab_cache_page(dir->i_mapping, 0);
	if (!page)
	return -ENOMEM;

	set_new_dnode(&dn, dir, ipage, NULL, 0);
	err = f2fs_reserve_block(&dn, 0);
	if (err)
	goto out;

	f2fs_wait_on_page_writeback(page, DATA);
	zero_user_segment(page, 0, PAGE_CACHE_SIZE);

	dentry_blk = kmap(page);

	/* copy data from inline dentry block to new dentry block */
	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
	INLINE_DENTRY_BITMAP_SIZE);
	memcpy(dentry_blk->dentry, inline_dentry->dentry,
	sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
	memcpy(dentry_blk->filename, inline_dentry->filename,
	NR_INLINE_DENTRY * F2FS_SLOT_LEN);

	kunmap(page);
	SetPageUptodate(page);
	set_page_dirty(page);

	/* clear inline dir and flag after data writeback */
	zero_user_segment(ipage, INLINE_DATA_OFFSET,
	INLINE_DATA_OFFSET + MAX_INLINE_DATA);
	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
	stat_dec_inline_inode(dir);

	if (i_size_read(dir) < PAGE_CACHE_SIZE) {
	i_size_write(dir, PAGE_CACHE_SIZE);
	set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	}

	sync_inode_page(&dn);
	out:
	f2fs_put_page(page, 1);
	return err;
	}

	int f2fs_add_inline_entry(struct inode dir, const struct qstr name,
	struct inode *inode)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	unsigned int bit_pos;
	f2fs_hash_t name_hash;
	struct f2fs_dir_entry *de;
	size_t namelen = name->len;
	struct f2fs_inline_dentry *dentry_blk = NULL;
	int slots = GET_DENTRY_SLOTS(namelen);
	struct page *page;
	int err = 0;
	int i;

	name_hash = f2fs_dentry_hash(name);

	ipage = get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return PTR_ERR(ipage);

	dentry_blk = inline_data_addr(ipage);
	bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
	slots, NR_INLINE_DENTRY);
	if (bit_pos >= NR_INLINE_DENTRY) {
	err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
	if (!err)
	err = -EAGAIN;
	goto out;
	}

	down_write(&F2FS_I(inode)->i_sem);
	page = init_inode_metadata(inode, dir, name, ipage);
	if (IS_ERR(page)) {
	err = PTR_ERR(page);
	goto fail;
	}

	f2fs_wait_on_page_writeback(ipage, NODE);
	de = &dentry_blk->dentry[bit_pos];
	de->hash_code = name_hash;
	de->name_len = cpu_to_le16(namelen);
	memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
	de->ino = cpu_to_le32(inode->i_ino);
	set_de_type(de, inode);
	for (i = 0; i < slots; i++)
	test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
	set_page_dirty(ipage);

	/* we don't need to mark_inode_dirty now */
	F2FS_I(inode)->i_pino = dir->i_ino;
	update_inode(inode, page);
	f2fs_put_page(page, 1);

	update_parent_metadata(dir, inode, 0);
	fail:
	up_write(&F2FS_I(inode)->i_sem);

	if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
	update_inode(dir, ipage);
	clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	}
	out:
	f2fs_put_page(ipage, 1);
	return err;
	}

	void f2fs_delete_inline_entry(struct f2fs_dir_entry dentry, struct page page,
	struct inode dir, struct inode inode)
	{
	struct f2fs_inline_dentry *inline_dentry;
	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
	unsigned int bit_pos;
	int i;

	lock_page(page);
	f2fs_wait_on_page_writeback(page, NODE);

	inline_dentry = inline_data_addr(page);
	bit_pos = dentry - inline_dentry->dentry;
	for (i = 0; i < slots; i++)
	test_and_clear_bit_le(bit_pos + i,
	&inline_dentry->dentry_bitmap);

	set_page_dirty(page);

	dir->i_ctime = dir->i_mtime = CURRENT_TIME;

	if (inode)
	f2fs_drop_nlink(dir, inode, page);

	f2fs_put_page(page, 1);
	}

	bool f2fs_empty_inline_dir(struct inode *dir)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	unsigned int bit_pos = 2;
	struct f2fs_inline_dentry *dentry_blk;

	ipage = get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return false;

	dentry_blk = inline_data_addr(ipage);
	bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
	NR_INLINE_DENTRY,
	bit_pos);

	f2fs_put_page(ipage, 1);

	if (bit_pos < NR_INLINE_DENTRY)
	return false;

	return true;
	}

	int f2fs_read_inline_dir(struct file file, struct dir_context ctx)
	{
	struct inode *inode = file_inode(file);
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	unsigned int bit_pos = 0;
	struct f2fs_inline_dentry *inline_dentry = NULL;
	struct f2fs_dir_entry *de = NULL;
	struct page *ipage = NULL;
	unsigned char d_type = DT_UNKNOWN;

	if (ctx->pos == NR_INLINE_DENTRY)
	return 0;

	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage))
	return PTR_ERR(ipage);

	bit_pos = ((unsigned long)ctx->pos % NR_INLINE_DENTRY);

	inline_dentry = inline_data_addr(ipage);
	while (bit_pos < NR_INLINE_DENTRY) {
	bit_pos = find_next_bit_le(&inline_dentry->dentry_bitmap,
	NR_INLINE_DENTRY,
	bit_pos);
	if (bit_pos >= NR_INLINE_DENTRY)
	break;

	de = &inline_dentry->dentry[bit_pos];
	if (de->file_type < F2FS_FT_MAX)
	d_type = f2fs_filetype_table[de->file_type];
	else
	d_type = DT_UNKNOWN;

	if (!dir_emit(ctx,
	inline_dentry->filename[bit_pos],
	le16_to_cpu(de->name_len),
	le32_to_cpu(de->ino), d_type))
	goto out;

	bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
	ctx->pos = bit_pos;
	}

	ctx->pos = NR_INLINE_DENTRY;
	out:
	f2fs_put_page(ipage, 1);

	return 0;
	}