[mirror_ubuntu-artful-kernel.git] / fs / f2fs / inline.c

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

	if (f2fs_is_atomic_file(inode))
		return false;

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

	if (i_size_read(inode) > MAX_INLINE_DATA)
		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_CACHE_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);
}

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_CACHE_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)
{
	void *src_addr, *dst_addr;
	block_t new_blk_addr;
	struct f2fs_io_info fio = {
		.type = DATA,
		.rw = WRITE_SYNC | REQ_PRIO,
	};
	int err;

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

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

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

	f2fs_wait_on_page_writeback(page, DATA);

	if (PageUptodate(page))
		goto no_update;

	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);

	/* Copy the whole inline data block */
	src_addr = inline_data_addr(dn->inode_page);
	dst_addr = kmap_atomic(page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
	flush_dcache_page(page);
	kunmap_atomic(dst_addr);
	SetPageUptodate(page);
no_update:
	/* 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 */
	truncate_inline_data(dn->inode_page, 0);
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;

	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);
	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);
	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);
	f2fs_put_dnode(&dn);
	return 0;
}

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

	if (from >= MAX_INLINE_DATA)
		return;

	f2fs_wait_on_page_writeback(ipage, NODE);

	addr = inline_data_addr(ipage);
	memset(addr + from, 0, MAX_INLINE_DATA - from);
}

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);

		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));
		truncate_inline_data(ipage, 0);
		f2fs_clear_inline_inode(inode);
		update_inode(inode, ipage);
		f2fs_put_page(ipage, 1);
	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
		truncate_blocks(inode, 0, false);
		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 f2fs_dentry_ptr d;
	struct page *ipage;

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

	inline_dentry = inline_data_addr(ipage);

	make_dentry_ptr(&d, (void *)inline_dentry, 2);
	de = find_target_dentry(name, 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(&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;
}

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)
		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_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);
	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_data(ipage, 0);

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

	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_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(&d, (void *)inline_dentry, 2);

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

	f2fs_put_page(ipage, 1);
	return 0;
}
Commit	Line	Data
e18c65b2 HL	1	/*
	2	* fs/f2fs/inline.c
	3	* Copyright (c) 2013, Intel Corporation
	4	* Authors: Huajun Li <huajun.li@intel.com>
	5	* Haicheng Li <haicheng.li@intel.com>
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13
	14	#include "f2fs.h"
	15
e18c65b2 HL	16	bool f2fs_may_inline(struct inode *inode)
e18c65b2 HL	17	{
4081363f	18	if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
e18c65b2 HL	19	return false;
e18c65b2 HL	20
88b88a66 JK	21	if (f2fs_is_atomic_file(inode))
	22	return false;
	23
b3d208f9	24	if (!S_ISREG(inode->i_mode))
e18c65b2 HL	25	return false;
e18c65b2 HL	26
92dffd01 JK	27	if (i_size_read(inode) > MAX_INLINE_DATA)
	28	return false;
	29
e18c65b2 HL	30	return true;
	31	}
	32
b3d208f9	33	void read_inline_data(struct page page, struct page ipage)
e18c65b2	34	{
e18c65b2 HL	35	void src_addr, dst_addr;
e18c65b2 HL	36
b3d208f9 JK	37	if (PageUptodate(page))
b3d208f9 JK	38	return;
04a17fb1	39
b3d208f9	40	f2fs_bug_on(F2FS_P_SB(page), page->index);
e18c65b2	41
18309aaa	42	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
e18c65b2 HL	43
	44	/* Copy the whole inline data block */
	45	src_addr = inline_data_addr(ipage);
f1e33a04	46	dst_addr = kmap_atomic(page);
e18c65b2	47	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
427a45c8	48	flush_dcache_page(page);
f1e33a04	49	kunmap_atomic(dst_addr);
e18c65b2	50	SetPageUptodate(page);
b3d208f9 JK	51	}
	52
	53	int f2fs_read_inline_data(struct inode inode, struct page page)
	54	{
	55	struct page *ipage;
	56
	57	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
	58	if (IS_ERR(ipage)) {
	59	unlock_page(page);
	60	return PTR_ERR(ipage);
	61	}
e18c65b2	62
b3d208f9 JK	63	if (!f2fs_has_inline_data(inode)) {
	64	f2fs_put_page(ipage, 1);
	65	return -EAGAIN;
	66	}
	67
	68	if (page->index)
	69	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
	70	else
	71	read_inline_data(page, ipage);
	72
	73	SetPageUptodate(page);
	74	f2fs_put_page(ipage, 1);
	75	unlock_page(page);
e18c65b2 HL	76	return 0;
	77	}
	78
b3d208f9	79	int f2fs_convert_inline_page(struct dnode_of_data dn, struct page page)
e18c65b2	80	{
e18c65b2 HL	81	void src_addr, dst_addr;
e18c65b2 HL	82	block_t new_blk_addr;
e18c65b2 HL	83	struct f2fs_io_info fio = {
	84	.type = DATA,
	85	.rw = WRITE_SYNC \| REQ_PRIO,
	86	};
b3d208f9	87	int err;
e18c65b2	88
b3d208f9	89	f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
e18c65b2	90
b3d208f9 JK	91	if (!f2fs_exist_data(dn->inode))
b3d208f9 JK	92	goto clear_out;
ec4e7af4	93
b3d208f9	94	err = f2fs_reserve_block(dn, 0);
15c6e3aa	95	if (err)
b3d208f9	96	return err;
e18c65b2	97
9ac1349a	98	f2fs_wait_on_page_writeback(page, DATA);
b3d208f9 JK	99
	100	if (PageUptodate(page))
	101	goto no_update;
	102
18309aaa	103	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
e18c65b2 HL	104
e18c65b2 HL	105	/* Copy the whole inline data block */
b3d208f9	106	src_addr = inline_data_addr(dn->inode_page);
f1e33a04	107	dst_addr = kmap_atomic(page);
e18c65b2	108	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
09b8b3c8	109	flush_dcache_page(page);
f1e33a04	110	kunmap_atomic(dst_addr);
9e09fc85	111	SetPageUptodate(page);
b3d208f9	112	no_update:
e18c65b2 HL	113	/* write data page to try to make data consistent */
e18c65b2 HL	114	set_page_writeback(page);
b3d208f9 JK	115
	116	write_data_page(page, dn, &new_blk_addr, &fio);
	117	update_extent_cache(new_blk_addr, dn);
5514f0aa	118	f2fs_wait_on_page_writeback(page, DATA);
e18c65b2 HL	119
e18c65b2 HL	120	/* clear inline data and flag after data writeback */
b3d208f9 JK	121	truncate_inline_data(dn->inode_page, 0);
b3d208f9 JK	122	clear_out:
b3d208f9	123	stat_dec_inline_inode(dn->inode);
57e2a2c0	124	f2fs_clear_inline_inode(dn->inode);
b3d208f9 JK	125	sync_inode_page(dn);
	126	f2fs_put_dnode(dn);
	127	return 0;
e18c65b2 HL	128	}
e18c65b2 HL	129
b3d208f9	130	int f2fs_convert_inline_inode(struct inode *inode)
e18c65b2	131	{
b3d208f9 JK	132	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	133	struct dnode_of_data dn;
	134	struct page ipage, page;
	135	int err = 0;
e18c65b2	136
b3d208f9 JK	137	page = grab_cache_page(inode->i_mapping, 0);
	138	if (!page)
	139	return -ENOMEM;
e18c65b2	140
b3d208f9 JK	141	f2fs_lock_op(sbi);
	142
	143	ipage = get_node_page(sbi, inode->i_ino);
	144	if (IS_ERR(ipage)) {
6d20aff8 JK	145	err = PTR_ERR(ipage);
6d20aff8 JK	146	goto out;
b067ba1f	147	}
e18c65b2	148
b3d208f9 JK	149	set_new_dnode(&dn, inode, ipage, ipage, 0);
	150
	151	if (f2fs_has_inline_data(inode))
	152	err = f2fs_convert_inline_page(&dn, page);
	153
	154	f2fs_put_dnode(&dn);
6d20aff8	155	out:
b3d208f9 JK	156	f2fs_unlock_op(sbi);
	157
	158	f2fs_put_page(page, 1);
e18c65b2 HL	159	return err;
	160	}
	161
b3d208f9	162	int f2fs_write_inline_data(struct inode inode, struct page page)
e18c65b2 HL	163	{
e18c65b2 HL	164	void src_addr, dst_addr;
e18c65b2 HL	165	struct dnode_of_data dn;
	166	int err;
	167
	168	set_new_dnode(&dn, inode, NULL, NULL, 0);
	169	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	170	if (err)
	171	return err;
e18c65b2	172
c08a690b	173	if (!f2fs_has_inline_data(inode)) {
b3d208f9 JK	174	f2fs_put_dnode(&dn);
b3d208f9 JK	175	return -EAGAIN;
c08a690b JK	176	}
c08a690b JK	177
b3d208f9 JK	178	f2fs_bug_on(F2FS_I_SB(inode), page->index);
	179
	180	f2fs_wait_on_page_writeback(dn.inode_page, NODE);
f1e33a04	181	src_addr = kmap_atomic(page);
b3d208f9 JK	182	dst_addr = inline_data_addr(dn.inode_page);
b3d208f9 JK	183	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
f1e33a04	184	kunmap_atomic(src_addr);
e18c65b2	185
fff04f90	186	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
b3d208f9 JK	187	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
b3d208f9 JK	188
e18c65b2 HL	189	sync_inode_page(&dn);
e18c65b2 HL	190	f2fs_put_dnode(&dn);
e18c65b2 HL	191	return 0;
e18c65b2 HL	192	}
1e1bb4ba	193
b3d208f9	194	void truncate_inline_data(struct page *ipage, u64 from)
8aa6f1c5	195	{
b3d208f9	196	void *addr;
8aa6f1c5 CY	197
	198	if (from >= MAX_INLINE_DATA)
	199	return;
	200
54b591df JK	201	f2fs_wait_on_page_writeback(ipage, NODE);
54b591df JK	202
b3d208f9 JK	203	addr = inline_data_addr(ipage);
b3d208f9 JK	204	memset(addr + from, 0, MAX_INLINE_DATA - from);
8aa6f1c5 CY	205	}
8aa6f1c5 CY	206
0342fd30	207	bool recover_inline_data(struct inode inode, struct page npage)
1e1bb4ba	208	{
4081363f	209	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1e1bb4ba JK	210	struct f2fs_inode *ri = NULL;
	211	void src_addr, dst_addr;
	212	struct page *ipage;
	213
	214	/*
	215	* The inline_data recovery policy is as follows.
	216	* [prev.] [next] of inline_data flag
	217	* o o -> recover inline_data
	218	* o x -> remove inline_data, and then recover data blocks
	219	* x o -> remove inline_data, and then recover inline_data
	220	* x x -> recover data blocks
	221	*/
	222	if (IS_INODE(npage))
	223	ri = F2FS_INODE(npage);
	224
	225	if (f2fs_has_inline_data(inode) &&
0342fd30	226	ri && (ri->i_inline & F2FS_INLINE_DATA)) {
1e1bb4ba JK	227	process_inline:
1e1bb4ba JK	228	ipage = get_node_page(sbi, inode->i_ino);
9850cf4a	229	f2fs_bug_on(sbi, IS_ERR(ipage));
1e1bb4ba	230
54b591df JK	231	f2fs_wait_on_page_writeback(ipage, NODE);
54b591df JK	232
1e1bb4ba JK	233	src_addr = inline_data_addr(npage);
	234	dst_addr = inline_data_addr(ipage);
	235	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
b3d208f9 JK	236
	237	set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	238	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
	239
1e1bb4ba JK	240	update_inode(inode, ipage);
1e1bb4ba JK	241	f2fs_put_page(ipage, 1);
0342fd30	242	return true;
1e1bb4ba JK	243	}
	244
	245	if (f2fs_has_inline_data(inode)) {
	246	ipage = get_node_page(sbi, inode->i_ino);
9850cf4a	247	f2fs_bug_on(sbi, IS_ERR(ipage));
b3d208f9 JK	248	truncate_inline_data(ipage, 0);
b3d208f9 JK	249	f2fs_clear_inline_inode(inode);
1e1bb4ba JK	250	update_inode(inode, ipage);
1e1bb4ba JK	251	f2fs_put_page(ipage, 1);
0342fd30	252	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
764aa3e9	253	truncate_blocks(inode, 0, false);
1e1bb4ba JK	254	goto process_inline;
1e1bb4ba JK	255	}
0342fd30	256	return false;
1e1bb4ba	257	}
201a05be CY	258
	259	struct f2fs_dir_entry find_in_inline_dir(struct inode dir,
	260	struct qstr name, struct page *res_page)
	261	{
	262	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
4e6ebf6d	263	struct f2fs_inline_dentry *inline_dentry;
201a05be	264	struct f2fs_dir_entry *de;
7b3cd7d6	265	struct f2fs_dentry_ptr d;
4e6ebf6d	266	struct page *ipage;
201a05be CY	267
	268	ipage = get_node_page(sbi, dir->i_ino);
	269	if (IS_ERR(ipage))
	270	return NULL;
	271
4e6ebf6d	272	inline_dentry = inline_data_addr(ipage);
201a05be	273
7b3cd7d6 JK	274	make_dentry_ptr(&d, (void *)inline_dentry, 2);
	275	de = find_target_dentry(name, NULL, &d);
	276
201a05be	277	unlock_page(ipage);
4e6ebf6d JK	278	if (de)
	279	*res_page = ipage;
	280	else
	281	f2fs_put_page(ipage, 0);
	282
	283	/*
	284	* For the most part, it should be a bug when name_len is zero.
	285	* We stop here for figuring out where the bugs has occurred.
	286	*/
7b3cd7d6	287	f2fs_bug_on(sbi, d.max < 0);
201a05be CY	288	return de;
	289	}
	290
	291	struct f2fs_dir_entry f2fs_parent_inline_dir(struct inode dir,
	292	struct page **p)
	293	{
	294	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	295	struct page *ipage;
	296	struct f2fs_dir_entry *de;
	297	struct f2fs_inline_dentry *dentry_blk;
	298
	299	ipage = get_node_page(sbi, dir->i_ino);
	300	if (IS_ERR(ipage))
	301	return NULL;
	302
	303	dentry_blk = inline_data_addr(ipage);
	304	de = &dentry_blk->dentry[1];
	305	*p = ipage;
	306	unlock_page(ipage);
	307	return de;
	308	}
	309
	310	int make_empty_inline_dir(struct inode inode, struct inode parent,
	311	struct page *ipage)
	312	{
	313	struct f2fs_inline_dentry *dentry_blk;
062a3e7b	314	struct f2fs_dentry_ptr d;
201a05be CY	315
	316	dentry_blk = inline_data_addr(ipage);
	317
062a3e7b JK	318	make_dentry_ptr(&d, (void *)dentry_blk, 2);
062a3e7b JK	319	do_make_empty_dir(inode, parent, &d);
201a05be CY	320
	321	set_page_dirty(ipage);
	322
	323	/* update i_size to MAX_INLINE_DATA */
	324	if (i_size_read(inode) < MAX_INLINE_DATA) {
	325	i_size_write(inode, MAX_INLINE_DATA);
	326	set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
	327	}
	328	return 0;
	329	}
	330
d64948a4	331	static int f2fs_convert_inline_dir(struct inode dir, struct page ipage,
201a05be CY	332	struct f2fs_inline_dentry *inline_dentry)
	333	{
	334	struct page *page;
	335	struct dnode_of_data dn;
	336	struct f2fs_dentry_block *dentry_blk;
	337	int err;
	338
	339	page = grab_cache_page(dir->i_mapping, 0);
	340	if (!page)
	341	return -ENOMEM;
	342
	343	set_new_dnode(&dn, dir, ipage, NULL, 0);
	344	err = f2fs_reserve_block(&dn, 0);
	345	if (err)
	346	goto out;
	347
	348	f2fs_wait_on_page_writeback(page, DATA);
	349	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
	350
f1e33a04	351	dentry_blk = kmap_atomic(page);
201a05be CY	352
	353	/* copy data from inline dentry block to new dentry block */
	354	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
	355	INLINE_DENTRY_BITMAP_SIZE);
	356	memcpy(dentry_blk->dentry, inline_dentry->dentry,
	357	sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
	358	memcpy(dentry_blk->filename, inline_dentry->filename,
	359	NR_INLINE_DENTRY * F2FS_SLOT_LEN);
	360
f1e33a04	361	kunmap_atomic(dentry_blk);
201a05be CY	362	SetPageUptodate(page);
	363	set_page_dirty(page);
	364
	365	/* clear inline dir and flag after data writeback */
b3d208f9 JK	366	truncate_inline_data(ipage, 0);
b3d208f9 JK	367
3289c061	368	stat_dec_inline_dir(dir);
622f28ae	369	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
201a05be CY	370
	371	if (i_size_read(dir) < PAGE_CACHE_SIZE) {
	372	i_size_write(dir, PAGE_CACHE_SIZE);
	373	set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	374	}
	375
	376	sync_inode_page(&dn);
	377	out:
	378	f2fs_put_page(page, 1);
	379	return err;
	380	}
	381
	382	int f2fs_add_inline_entry(struct inode dir, const struct qstr name,
	383	struct inode *inode)
	384	{
	385	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	386	struct page *ipage;
	387	unsigned int bit_pos;
	388	f2fs_hash_t name_hash;
	389	struct f2fs_dir_entry *de;
	390	size_t namelen = name->len;
	391	struct f2fs_inline_dentry *dentry_blk = NULL;
	392	int slots = GET_DENTRY_SLOTS(namelen);
	393	struct page *page;
	394	int err = 0;
	395	int i;
	396
	397	name_hash = f2fs_dentry_hash(name);
	398
	399	ipage = get_node_page(sbi, dir->i_ino);
	400	if (IS_ERR(ipage))
	401	return PTR_ERR(ipage);
	402
	403	dentry_blk = inline_data_addr(ipage);
a82afa20 JK	404	bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
a82afa20 JK	405	slots, NR_INLINE_DENTRY);
201a05be CY	406	if (bit_pos >= NR_INLINE_DENTRY) {
	407	err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
	408	if (!err)
	409	err = -EAGAIN;
	410	goto out;
	411	}
	412
201a05be	413	down_write(&F2FS_I(inode)->i_sem);
bce8d112	414	page = init_inode_metadata(inode, dir, name, ipage);
201a05be CY	415	if (IS_ERR(page)) {
	416	err = PTR_ERR(page);
	417	goto fail;
	418	}
bce8d112 JK	419
bce8d112 JK	420	f2fs_wait_on_page_writeback(ipage, NODE);
201a05be CY	421	de = &dentry_blk->dentry[bit_pos];
	422	de->hash_code = name_hash;
	423	de->name_len = cpu_to_le16(namelen);
	424	memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
	425	de->ino = cpu_to_le32(inode->i_ino);
	426	set_de_type(de, inode);
	427	for (i = 0; i < slots; i++)
	428	test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
	429	set_page_dirty(ipage);
	430
	431	/* we don't need to mark_inode_dirty now */
	432	F2FS_I(inode)->i_pino = dir->i_ino;
	433	update_inode(inode, page);
	434	f2fs_put_page(page, 1);
	435
	436	update_parent_metadata(dir, inode, 0);
	437	fail:
	438	up_write(&F2FS_I(inode)->i_sem);
	439
	440	if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
	441	update_inode(dir, ipage);
	442	clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	443	}
	444	out:
	445	f2fs_put_page(ipage, 1);
	446	return err;
	447	}
	448
	449	void f2fs_delete_inline_entry(struct f2fs_dir_entry dentry, struct page page,
	450	struct inode dir, struct inode inode)
	451	{
	452	struct f2fs_inline_dentry *inline_dentry;
	453	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
	454	unsigned int bit_pos;
	455	int i;
	456
	457	lock_page(page);
59a06155	458	f2fs_wait_on_page_writeback(page, NODE);
201a05be CY	459
	460	inline_dentry = inline_data_addr(page);
	461	bit_pos = dentry - inline_dentry->dentry;
	462	for (i = 0; i < slots; i++)
	463	test_and_clear_bit_le(bit_pos + i,
	464	&inline_dentry->dentry_bitmap);
	465
	466	set_page_dirty(page);
	467
	468	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	469
	470	if (inode)
	471	f2fs_drop_nlink(dir, inode, page);
	472
	473	f2fs_put_page(page, 1);
	474	}
	475
	476	bool f2fs_empty_inline_dir(struct inode *dir)
	477	{
	478	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	479	struct page *ipage;
	480	unsigned int bit_pos = 2;
	481	struct f2fs_inline_dentry *dentry_blk;
	482
	483	ipage = get_node_page(sbi, dir->i_ino);
	484	if (IS_ERR(ipage))
	485	return false;
	486
	487	dentry_blk = inline_data_addr(ipage);
	488	bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
	489	NR_INLINE_DENTRY,
	490	bit_pos);
	491
	492	f2fs_put_page(ipage, 1);
	493
	494	if (bit_pos < NR_INLINE_DENTRY)
	495	return false;
	496
	497	return true;
	498	}
	499
	500	int f2fs_read_inline_dir(struct file file, struct dir_context ctx)
	501	{
	502	struct inode *inode = file_inode(file);
201a05be	503	struct f2fs_inline_dentry *inline_dentry = NULL;
201a05be	504	struct page *ipage = NULL;
7b3cd7d6	505	struct f2fs_dentry_ptr d;
201a05be CY	506
	507	if (ctx->pos == NR_INLINE_DENTRY)
	508	return 0;
	509
38594de7	510	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
201a05be CY	511	if (IS_ERR(ipage))
	512	return PTR_ERR(ipage);
	513
201a05be	514	inline_dentry = inline_data_addr(ipage);
201a05be	515
7b3cd7d6 JK	516	make_dentry_ptr(&d, (void *)inline_dentry, 2);
	517
	518	if (!f2fs_fill_dentries(ctx, &d, 0))
38594de7	519	ctx->pos = NR_INLINE_DENTRY;
201a05be	520
38594de7	521	f2fs_put_page(ipage, 1);
201a05be CY	522	return 0;
201a05be CY	523	}