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"
 #include "node.h"

 bool f2fs_may_inline_data(struct inode *inode)
 {
 	if (f2fs_is_atomic_file(inode))
 		return false;

 	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
 		return false;

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

 	if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
 		return false;

 	return true;
 }

 bool f2fs_may_inline_dentry(struct inode *inode)
 {
 	if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
 		return false;

 	if (!S_ISDIR(inode->i_mode))
 		return false;

 	return true;
 }

 void read_inline_data(struct page *page, struct page *ipage)
 {
 	void *src_addr, *dst_addr;

 	if (PageUptodate(page))
 		return;

 	f2fs_bug_on(F2FS_P_SB(page), page->index);

 	zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);

 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(ipage);
 	dst_addr = kmap_atomic(page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 	flush_dcache_page(page);
 	kunmap_atomic(dst_addr);
 	SetPageUptodate(page);
 }

 bool truncate_inline_inode(struct page *ipage, u64 from)
 {
 	void *addr;

 	if (from >= MAX_INLINE_DATA)
 		return false;

 	addr = inline_data_addr(ipage);

 	f2fs_wait_on_page_writeback(ipage, NODE, true);
 	memset(addr + from, 0, MAX_INLINE_DATA - from);

 	return true;
 }

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

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

 	if (!f2fs_has_inline_data(inode)) {
 		f2fs_put_page(ipage, 1);
 		return -EAGAIN;
 	}

 	if (page->index)
 		zero_user_segment(page, 0, PAGE_SIZE);
 	else
 		read_inline_data(page, ipage);

 	SetPageUptodate(page);
 	f2fs_put_page(ipage, 1);
 	unlock_page(page);
 	return 0;
 }

 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 {
 	struct f2fs_io_info fio = {
 		.sbi = F2FS_I_SB(dn->inode),
 		.type = DATA,
 		.rw = WRITE_SYNC | REQ_PRIO,
 		.page = page,
 		.encrypted_page = NULL,
 	};
 	int dirty, err;

 	if (!f2fs_exist_data(dn->inode))
 		goto clear_out;

 	err = f2fs_reserve_block(dn, 0);
 	if (err)
 		return err;

 	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));

 	read_inline_data(page, dn->inode_page);
 	set_page_dirty(page);

 	/* clear dirty state */
 	dirty = clear_page_dirty_for_io(page);

 	/* write data page to try to make data consistent */
 	set_page_writeback(page);
 	fio.old_blkaddr = dn->data_blkaddr;
 	write_data_page(dn, &fio);
 	f2fs_wait_on_page_writeback(page, DATA, true);
 	if (dirty)
 		inode_dec_dirty_pages(dn->inode);

 	/* this converted inline_data should be recovered. */
 	set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);

 	/* clear inline data and flag after data writeback */
 	truncate_inline_inode(dn->inode_page, 0);
 	clear_inline_node(dn->inode_page);
 clear_out:
 	stat_dec_inline_inode(dn->inode);
 	f2fs_clear_inline_inode(dn->inode);
 	sync_inode_page(dn);
 	f2fs_put_dnode(dn);
 	return 0;
 }

 int f2fs_convert_inline_inode(struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct dnode_of_data dn;
 	struct page *ipage, *page;
 	int err = 0;

 	if (!f2fs_has_inline_data(inode))
 		return 0;

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

 	f2fs_lock_op(sbi);

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

 	set_new_dnode(&dn, inode, ipage, ipage, 0);

 	if (f2fs_has_inline_data(inode))
 		err = f2fs_convert_inline_page(&dn, page);

 	f2fs_put_dnode(&dn);
 out:
 	f2fs_unlock_op(sbi);

 	f2fs_put_page(page, 1);

 	f2fs_balance_fs(sbi, dn.node_changed);

 	return err;
 }

 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 {
 	void *src_addr, *dst_addr;
 	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;

 	if (!f2fs_has_inline_data(inode)) {
 		f2fs_put_dnode(&dn);
 		return -EAGAIN;
 	}

 	f2fs_bug_on(F2FS_I_SB(inode), page->index);

 	f2fs_wait_on_page_writeback(dn.inode_page, NODE, true);
 	src_addr = kmap_atomic(page);
 	dst_addr = inline_data_addr(dn.inode_page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
 	kunmap_atomic(src_addr);

 	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
 	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);

 	sync_inode_page(&dn);
 	clear_inline_node(dn.inode_page);
 	f2fs_put_dnode(&dn);
 	return 0;
 }

 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, true);

 		src_addr = inline_data_addr(npage);
 		dst_addr = inline_data_addr(ipage);
 		memcpy(dst_addr, src_addr, MAX_INLINE_DATA);

 		set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
 		set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);

 		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));
 		if (!truncate_inline_inode(ipage, 0))
 			return false;
 		f2fs_clear_inline_inode(inode);
 		update_inode(inode, ipage);
 		f2fs_put_page(ipage, 1);
 	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 		if (truncate_blocks(inode, 0, false))
 			return false;
 		goto process_inline;
 	}
 	return false;
 }

 struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
 			struct fscrypt_name *fname, struct page **res_page)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct f2fs_inline_dentry *inline_dentry;
 	struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 	struct f2fs_dir_entry *de;
 	struct f2fs_dentry_ptr d;
 	struct page *ipage;
 	f2fs_hash_t namehash;

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

 	namehash = f2fs_dentry_hash(&name);

 	inline_dentry = inline_data_addr(ipage);

 	make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
 	de = find_target_dentry(fname, namehash, NULL, &d);
 	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, d.max < 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_dentry_ptr d;

 	dentry_blk = inline_data_addr(ipage);

 	make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 	do_make_empty_dir(inode, parent, &d);

 	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;
 }

 /*
  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
  * release ipage in this function.
  */
 static 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) {
 		f2fs_put_page(ipage, 1);
 		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, true);
 	zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);

 	dentry_blk = kmap_atomic(page);

 	/* copy data from inline dentry block to new dentry block */
 	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
 					INLINE_DENTRY_BITMAP_SIZE);
 	memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
 			SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
 	/*
 	 * we do not need to zero out remainder part of dentry and filename
 	 * field, since we have used bitmap for marking the usage status of
 	 * them, besides, we can also ignore copying/zeroing reserved space
 	 * of dentry block, because them haven't been used so far.
 	 */
 	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_atomic(dentry_blk);
 	SetPageUptodate(page);
 	set_page_dirty(page);

 	/* clear inline dir and flag after data writeback */
 	truncate_inline_inode(ipage, 0);

 	stat_dec_inline_dir(dir);
 	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);

 	if (i_size_read(dir) < PAGE_SIZE) {
 		i_size_write(dir, PAGE_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, nid_t ino, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	unsigned int bit_pos;
 	f2fs_hash_t name_hash;
 	size_t namelen = name->len;
 	struct f2fs_inline_dentry *dentry_blk = NULL;
 	struct f2fs_dentry_ptr d;
 	int slots = GET_DENTRY_SLOTS(namelen);
 	struct page *page = NULL;
 	int err = 0;

 	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)
 			return err;
 		err = -EAGAIN;
 		goto out;
 	}

 	if (inode) {
 		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, true);

 	name_hash = f2fs_dentry_hash(name);
 	make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
 	f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);

 	set_page_dirty(ipage);

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

 	update_parent_metadata(dir, inode, 0);
 fail:
 	if (inode)
 		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, true);

 	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 fscrypt_str *fstr)
 {
 	struct inode *inode = file_inode(file);
 	struct f2fs_inline_dentry *inline_dentry = NULL;
 	struct page *ipage = NULL;
 	struct f2fs_dentry_ptr d;

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

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

 	inline_dentry = inline_data_addr(ipage);

 	make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);

 	if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
 		ctx->pos = NR_INLINE_DENTRY;

 	f2fs_put_page(ipage, 1);
 	return 0;
 }

 int f2fs_inline_data_fiemap(struct inode *inode,
 		struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 {
 	__u64 byteaddr, ilen;
 	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 		FIEMAP_EXTENT_LAST;
 	struct node_info ni;
 	struct page *ipage;
 	int err = 0;

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

 	if (!f2fs_has_inline_data(inode)) {
 		err = -EAGAIN;
 		goto out;
 	}

 	ilen = min_t(size_t, MAX_INLINE_DATA, i_size_read(inode));
 	if (start >= ilen)
 		goto out;
 	if (start + len < ilen)
 		ilen = start + len;
 	ilen -= start;

 	get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
 	byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
 	byteaddr += (char *)inline_data_addr(ipage) - (char *)F2FS_INODE(ipage);
 	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
 out:
 	f2fs_put_page(ipage, 1);
 	return err;
 }
	/*
	* 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"
	#include "node.h"

	bool f2fs_may_inline_data(struct inode *inode)
	{
	if (f2fs_is_atomic_file(inode))
	return false;

	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
	return false;

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

	if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
	return false;

	return true;
	}

	bool f2fs_may_inline_dentry(struct inode *inode)
	{
	if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
	return false;

	if (!S_ISDIR(inode->i_mode))
	return false;

	return true;
	}

	void read_inline_data(struct page page, struct page ipage)
	{
	void src_addr, dst_addr;

	if (PageUptodate(page))
	return;

	f2fs_bug_on(F2FS_P_SB(page), page->index);

	zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);

	/* Copy the whole inline data block */
	src_addr = inline_data_addr(ipage);
	dst_addr = kmap_atomic(page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	flush_dcache_page(page);
	kunmap_atomic(dst_addr);
	SetPageUptodate(page);
	}

	bool truncate_inline_inode(struct page *ipage, u64 from)
	{
	void *addr;

	if (from >= MAX_INLINE_DATA)
	return false;

	addr = inline_data_addr(ipage);

	f2fs_wait_on_page_writeback(ipage, NODE, true);
	memset(addr + from, 0, MAX_INLINE_DATA - from);

	return true;
	}

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

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

	if (!f2fs_has_inline_data(inode)) {
	f2fs_put_page(ipage, 1);
	return -EAGAIN;
	}

	if (page->index)
	zero_user_segment(page, 0, PAGE_SIZE);
	else
	read_inline_data(page, ipage);

	SetPageUptodate(page);
	f2fs_put_page(ipage, 1);
	unlock_page(page);
	return 0;
	}

	int f2fs_convert_inline_page(struct dnode_of_data dn, struct page page)
	{
	struct f2fs_io_info fio = {
	.sbi = F2FS_I_SB(dn->inode),
	.type = DATA,
	.rw = WRITE_SYNC \| REQ_PRIO,
	.page = page,
	.encrypted_page = NULL,
	};
	int dirty, err;

	if (!f2fs_exist_data(dn->inode))
	goto clear_out;

	err = f2fs_reserve_block(dn, 0);
	if (err)
	return err;

	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));

	read_inline_data(page, dn->inode_page);
	set_page_dirty(page);

	/* clear dirty state */
	dirty = clear_page_dirty_for_io(page);

	/* write data page to try to make data consistent */
	set_page_writeback(page);
	fio.old_blkaddr = dn->data_blkaddr;
	write_data_page(dn, &fio);
	f2fs_wait_on_page_writeback(page, DATA, true);
	if (dirty)
	inode_dec_dirty_pages(dn->inode);

	/* this converted inline_data should be recovered. */
	set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);

	/* clear inline data and flag after data writeback */
	truncate_inline_inode(dn->inode_page, 0);
	clear_inline_node(dn->inode_page);
	clear_out:
	stat_dec_inline_inode(dn->inode);
	f2fs_clear_inline_inode(dn->inode);
	sync_inode_page(dn);
	f2fs_put_dnode(dn);
	return 0;
	}

	int f2fs_convert_inline_inode(struct inode *inode)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct dnode_of_data dn;
	struct page ipage, page;
	int err = 0;

	if (!f2fs_has_inline_data(inode))
	return 0;

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

	f2fs_lock_op(sbi);

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

	set_new_dnode(&dn, inode, ipage, ipage, 0);

	if (f2fs_has_inline_data(inode))
	err = f2fs_convert_inline_page(&dn, page);

	f2fs_put_dnode(&dn);
	out:
	f2fs_unlock_op(sbi);

	f2fs_put_page(page, 1);

	f2fs_balance_fs(sbi, dn.node_changed);

	return err;
	}

	int f2fs_write_inline_data(struct inode inode, struct page page)
	{
	void src_addr, dst_addr;
	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;

	if (!f2fs_has_inline_data(inode)) {
	f2fs_put_dnode(&dn);
	return -EAGAIN;
	}

	f2fs_bug_on(F2FS_I_SB(inode), page->index);

	f2fs_wait_on_page_writeback(dn.inode_page, NODE, true);
	src_addr = kmap_atomic(page);
	dst_addr = inline_data_addr(dn.inode_page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	kunmap_atomic(src_addr);

	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);

	sync_inode_page(&dn);
	clear_inline_node(dn.inode_page);
	f2fs_put_dnode(&dn);
	return 0;
	}

	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, true);

	src_addr = inline_data_addr(npage);
	dst_addr = inline_data_addr(ipage);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);

	set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);

	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));
	if (!truncate_inline_inode(ipage, 0))
	return false;
	f2fs_clear_inline_inode(inode);
	update_inode(inode, ipage);
	f2fs_put_page(ipage, 1);
	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
	if (truncate_blocks(inode, 0, false))
	return false;
	goto process_inline;
	}
	return false;
	}

	struct f2fs_dir_entry find_in_inline_dir(struct inode dir,
	struct fscrypt_name fname, struct page *res_page)
	{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct f2fs_inline_dentry *inline_dentry;
	struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
	struct f2fs_dir_entry *de;
	struct f2fs_dentry_ptr d;
	struct page *ipage;
	f2fs_hash_t namehash;

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

	namehash = f2fs_dentry_hash(&name);

	inline_dentry = inline_data_addr(ipage);

	make_dentry_ptr(NULL, &d, (void *)inline_dentry, 2);
	de = find_target_dentry(fname, namehash, NULL, &d);
	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, d.max < 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_dentry_ptr d;

	dentry_blk = inline_data_addr(ipage);

	make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
	do_make_empty_dir(inode, parent, &d);

	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;
	}

	/*
	* NOTE: ipage is grabbed by caller, but if any error occurs, we should
	* release ipage in this function.
	*/
	static 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) {
	f2fs_put_page(ipage, 1);
	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, true);
	zero_user_segment(page, MAX_INLINE_DATA, PAGE_SIZE);

	dentry_blk = kmap_atomic(page);

	/* copy data from inline dentry block to new dentry block */
	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
	INLINE_DENTRY_BITMAP_SIZE);
	memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
	SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
	/*
	* we do not need to zero out remainder part of dentry and filename
	* field, since we have used bitmap for marking the usage status of
	* them, besides, we can also ignore copying/zeroing reserved space
	* of dentry block, because them haven't been used so far.
	*/
	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_atomic(dentry_blk);
	SetPageUptodate(page);
	set_page_dirty(page);

	/* clear inline dir and flag after data writeback */
	truncate_inline_inode(ipage, 0);

	stat_dec_inline_dir(dir);
	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);

	if (i_size_read(dir) < PAGE_SIZE) {
	i_size_write(dir, PAGE_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, nid_t ino, umode_t mode)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	unsigned int bit_pos;
	f2fs_hash_t name_hash;
	size_t namelen = name->len;
	struct f2fs_inline_dentry *dentry_blk = NULL;
	struct f2fs_dentry_ptr d;
	int slots = GET_DENTRY_SLOTS(namelen);
	struct page *page = NULL;
	int err = 0;

	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)
	return err;
	err = -EAGAIN;
	goto out;
	}

	if (inode) {
	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, true);

	name_hash = f2fs_dentry_hash(name);
	make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
	f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);

	set_page_dirty(ipage);

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

	update_parent_metadata(dir, inode, 0);
	fail:
	if (inode)
	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, true);

	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 fscrypt_str *fstr)
	{
	struct inode *inode = file_inode(file);
	struct f2fs_inline_dentry *inline_dentry = NULL;
	struct page *ipage = NULL;
	struct f2fs_dentry_ptr d;

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

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

	inline_dentry = inline_data_addr(ipage);

	make_dentry_ptr(inode, &d, (void *)inline_dentry, 2);

	if (!f2fs_fill_dentries(ctx, &d, 0, fstr))
	ctx->pos = NR_INLINE_DENTRY;

	f2fs_put_page(ipage, 1);
	return 0;
	}

	int f2fs_inline_data_fiemap(struct inode *inode,
	struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
	{
	__u64 byteaddr, ilen;
	__u32 flags = FIEMAP_EXTENT_DATA_INLINE \| FIEMAP_EXTENT_NOT_ALIGNED \|
	FIEMAP_EXTENT_LAST;
	struct node_info ni;
	struct page *ipage;
	int err = 0;

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

	if (!f2fs_has_inline_data(inode)) {
	err = -EAGAIN;
	goto out;
	}

	ilen = min_t(size_t, MAX_INLINE_DATA, i_size_read(inode));
	if (start >= ilen)
	goto out;
	if (start + len < ilen)
	ilen = start + len;
	ilen -= start;

	get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
	byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
	byteaddr += (char )inline_data_addr(ipage) - (char )F2FS_INODE(ipage);
	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
	out:
	f2fs_put_page(ipage, 1);
	return err;
	}