[deliverable/linux.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_data(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) && !S_ISLNK(inode->i_mode))
		return false;

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

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);
	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_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;
	struct f2fs_io_info fio = {
		.sbi = F2FS_I_SB(dn->inode),
		.type = DATA,
		.rw = WRITE_SYNC | REQ_PRIO,
		.page = page,
	};
	int dirty, 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:
	/* clear dirty state */
	dirty = clear_page_dirty_for_io(page);

	/* write data page to try to make data consistent */
	set_page_writeback(page);
	fio.blk_addr = dn->data_blkaddr;
	write_data_page(dn, &fio);
	set_data_blkaddr(dn);
	f2fs_update_extent_cache(dn);
	f2fs_wait_on_page_writeback(page, DATA);
	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_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;
}

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_inode(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_inode(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, 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)
			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);

	name_hash = f2fs_dentry_hash(name);
	make_dentry_ptr(&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);

	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
01b960e9	16	bool f2fs_may_inline_data(struct inode *inode)
e18c65b2	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
368a0e40	24	if (!S_ISREG(inode->i_mode) && !S_ISLNK(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
01b960e9 JK	33	bool f2fs_may_inline_dentry(struct inode *inode)
	34	{
	35	if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
	36	return false;
	37
	38	if (!S_ISDIR(inode->i_mode))
	39	return false;
	40
	41	return true;
	42	}
	43
b3d208f9	44	void read_inline_data(struct page page, struct page ipage)
e18c65b2	45	{
e18c65b2 HL	46	void src_addr, dst_addr;
e18c65b2 HL	47
b3d208f9 JK	48	if (PageUptodate(page))
b3d208f9 JK	49	return;
04a17fb1	50
b3d208f9	51	f2fs_bug_on(F2FS_P_SB(page), page->index);
e18c65b2	52
18309aaa	53	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
e18c65b2 HL	54
	55	/* Copy the whole inline data block */
	56	src_addr = inline_data_addr(ipage);
f1e33a04	57	dst_addr = kmap_atomic(page);
e18c65b2	58	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
427a45c8	59	flush_dcache_page(page);
f1e33a04	60	kunmap_atomic(dst_addr);
e18c65b2	61	SetPageUptodate(page);
b3d208f9 JK	62	}
b3d208f9 JK	63
0bfcfcca	64	bool truncate_inline_inode(struct page *ipage, u64 from)
feeb0deb	65	{
0bfcfcca CY	66	void *addr;
0bfcfcca CY	67
0bfcfcca CY	68	if (from >= MAX_INLINE_DATA)
	69	return false;
	70
	71	addr = inline_data_addr(ipage);
	72
feeb0deb	73	f2fs_wait_on_page_writeback(ipage, NODE);
0bfcfcca CY	74	memset(addr + from, 0, MAX_INLINE_DATA - from);
	75
	76	return true;
feeb0deb CY	77	}
feeb0deb CY	78
b3d208f9 JK	79	int f2fs_read_inline_data(struct inode inode, struct page page)
	80	{
	81	struct page *ipage;
	82
	83	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
	84	if (IS_ERR(ipage)) {
	85	unlock_page(page);
	86	return PTR_ERR(ipage);
	87	}
e18c65b2	88
b3d208f9 JK	89	if (!f2fs_has_inline_data(inode)) {
	90	f2fs_put_page(ipage, 1);
	91	return -EAGAIN;
	92	}
	93
	94	if (page->index)
	95	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
	96	else
	97	read_inline_data(page, ipage);
	98
	99	SetPageUptodate(page);
	100	f2fs_put_page(ipage, 1);
	101	unlock_page(page);
e18c65b2 HL	102	return 0;
	103	}
	104
b3d208f9	105	int f2fs_convert_inline_page(struct dnode_of_data dn, struct page page)
e18c65b2	106	{
e18c65b2	107	void src_addr, dst_addr;
e18c65b2	108	struct f2fs_io_info fio = {
05ca3632	109	.sbi = F2FS_I_SB(dn->inode),
e18c65b2 HL	110	.type = DATA,
e18c65b2 HL	111	.rw = WRITE_SYNC \| REQ_PRIO,
05ca3632	112	.page = page,
e18c65b2	113	};
158c194c	114	int dirty, err;
e18c65b2	115
b3d208f9	116	f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
e18c65b2	117
b3d208f9 JK	118	if (!f2fs_exist_data(dn->inode))
b3d208f9 JK	119	goto clear_out;
ec4e7af4	120
b3d208f9	121	err = f2fs_reserve_block(dn, 0);
15c6e3aa	122	if (err)
b3d208f9	123	return err;
e18c65b2	124
9ac1349a	125	f2fs_wait_on_page_writeback(page, DATA);
b3d208f9 JK	126
	127	if (PageUptodate(page))
	128	goto no_update;
	129
18309aaa	130	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
e18c65b2 HL	131
e18c65b2 HL	132	/* Copy the whole inline data block */
b3d208f9	133	src_addr = inline_data_addr(dn->inode_page);
f1e33a04	134	dst_addr = kmap_atomic(page);
e18c65b2	135	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
09b8b3c8	136	flush_dcache_page(page);
f1e33a04	137	kunmap_atomic(dst_addr);
9e09fc85	138	SetPageUptodate(page);
b3d208f9	139	no_update:
158c194c JK	140	/* clear dirty state */
	141	dirty = clear_page_dirty_for_io(page);
	142
e18c65b2 HL	143	/* write data page to try to make data consistent */
e18c65b2 HL	144	set_page_writeback(page);
cf04e8eb	145	fio.blk_addr = dn->data_blkaddr;
05ca3632	146	write_data_page(dn, &fio);
216a620a	147	set_data_blkaddr(dn);
7e4dde79	148	f2fs_update_extent_cache(dn);
5514f0aa	149	f2fs_wait_on_page_writeback(page, DATA);
158c194c JK	150	if (dirty)
158c194c JK	151	inode_dec_dirty_pages(dn->inode);
e18c65b2	152
95f5b0fc JK	153	/* this converted inline_data should be recovered. */
	154	set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
	155
e18c65b2	156	/* clear inline data and flag after data writeback */
0bfcfcca	157	truncate_inline_inode(dn->inode_page, 0);
b3d208f9	158	clear_out:
b3d208f9	159	stat_dec_inline_inode(dn->inode);
57e2a2c0	160	f2fs_clear_inline_inode(dn->inode);
b3d208f9 JK	161	sync_inode_page(dn);
	162	f2fs_put_dnode(dn);
	163	return 0;
e18c65b2 HL	164	}
e18c65b2 HL	165
b3d208f9	166	int f2fs_convert_inline_inode(struct inode *inode)
e18c65b2	167	{
b3d208f9 JK	168	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	169	struct dnode_of_data dn;
	170	struct page ipage, page;
	171	int err = 0;
e18c65b2	172
b3d208f9 JK	173	page = grab_cache_page(inode->i_mapping, 0);
	174	if (!page)
	175	return -ENOMEM;
e18c65b2	176
b3d208f9 JK	177	f2fs_lock_op(sbi);
	178
	179	ipage = get_node_page(sbi, inode->i_ino);
	180	if (IS_ERR(ipage)) {
6d20aff8 JK	181	err = PTR_ERR(ipage);
6d20aff8 JK	182	goto out;
b067ba1f	183	}
e18c65b2	184
b3d208f9 JK	185	set_new_dnode(&dn, inode, ipage, ipage, 0);
	186
	187	if (f2fs_has_inline_data(inode))
	188	err = f2fs_convert_inline_page(&dn, page);
	189
	190	f2fs_put_dnode(&dn);
6d20aff8	191	out:
b3d208f9 JK	192	f2fs_unlock_op(sbi);
	193
	194	f2fs_put_page(page, 1);
e18c65b2 HL	195	return err;
	196	}
	197
b3d208f9	198	int f2fs_write_inline_data(struct inode inode, struct page page)
e18c65b2 HL	199	{
e18c65b2 HL	200	void src_addr, dst_addr;
e18c65b2 HL	201	struct dnode_of_data dn;
	202	int err;
	203
	204	set_new_dnode(&dn, inode, NULL, NULL, 0);
	205	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	206	if (err)
	207	return err;
e18c65b2	208
c08a690b	209	if (!f2fs_has_inline_data(inode)) {
b3d208f9 JK	210	f2fs_put_dnode(&dn);
b3d208f9 JK	211	return -EAGAIN;
c08a690b JK	212	}
c08a690b JK	213
b3d208f9 JK	214	f2fs_bug_on(F2FS_I_SB(inode), page->index);
	215
	216	f2fs_wait_on_page_writeback(dn.inode_page, NODE);
f1e33a04	217	src_addr = kmap_atomic(page);
b3d208f9 JK	218	dst_addr = inline_data_addr(dn.inode_page);
b3d208f9 JK	219	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
f1e33a04	220	kunmap_atomic(src_addr);
e18c65b2	221
fff04f90	222	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
b3d208f9 JK	223	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
b3d208f9 JK	224
e18c65b2 HL	225	sync_inode_page(&dn);
e18c65b2 HL	226	f2fs_put_dnode(&dn);
e18c65b2 HL	227	return 0;
e18c65b2 HL	228	}
1e1bb4ba	229
0342fd30	230	bool recover_inline_data(struct inode inode, struct page npage)
1e1bb4ba	231	{
4081363f	232	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1e1bb4ba JK	233	struct f2fs_inode *ri = NULL;
	234	void src_addr, dst_addr;
	235	struct page *ipage;
	236
	237	/*
	238	* The inline_data recovery policy is as follows.
	239	* [prev.] [next] of inline_data flag
	240	* o o -> recover inline_data
	241	* o x -> remove inline_data, and then recover data blocks
	242	* x o -> remove inline_data, and then recover inline_data
	243	* x x -> recover data blocks
	244	*/
	245	if (IS_INODE(npage))
	246	ri = F2FS_INODE(npage);
	247
	248	if (f2fs_has_inline_data(inode) &&
0342fd30	249	ri && (ri->i_inline & F2FS_INLINE_DATA)) {
1e1bb4ba JK	250	process_inline:
1e1bb4ba JK	251	ipage = get_node_page(sbi, inode->i_ino);
9850cf4a	252	f2fs_bug_on(sbi, IS_ERR(ipage));
1e1bb4ba	253
54b591df JK	254	f2fs_wait_on_page_writeback(ipage, NODE);
54b591df JK	255
1e1bb4ba JK	256	src_addr = inline_data_addr(npage);
	257	dst_addr = inline_data_addr(ipage);
	258	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
b3d208f9 JK	259
	260	set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
	261	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
	262
1e1bb4ba JK	263	update_inode(inode, ipage);
1e1bb4ba JK	264	f2fs_put_page(ipage, 1);
0342fd30	265	return true;
1e1bb4ba JK	266	}
	267
	268	if (f2fs_has_inline_data(inode)) {
	269	ipage = get_node_page(sbi, inode->i_ino);
9850cf4a	270	f2fs_bug_on(sbi, IS_ERR(ipage));
0bfcfcca	271	truncate_inline_inode(ipage, 0);
b3d208f9	272	f2fs_clear_inline_inode(inode);
1e1bb4ba JK	273	update_inode(inode, ipage);
1e1bb4ba JK	274	f2fs_put_page(ipage, 1);
0342fd30	275	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
764aa3e9	276	truncate_blocks(inode, 0, false);
1e1bb4ba JK	277	goto process_inline;
1e1bb4ba JK	278	}
0342fd30	279	return false;
1e1bb4ba	280	}
201a05be CY	281
	282	struct f2fs_dir_entry find_in_inline_dir(struct inode dir,
	283	struct qstr name, struct page *res_page)
	284	{
	285	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
4e6ebf6d	286	struct f2fs_inline_dentry *inline_dentry;
201a05be	287	struct f2fs_dir_entry *de;
7b3cd7d6	288	struct f2fs_dentry_ptr d;
4e6ebf6d	289	struct page *ipage;
201a05be CY	290
	291	ipage = get_node_page(sbi, dir->i_ino);
	292	if (IS_ERR(ipage))
	293	return NULL;
	294
4e6ebf6d	295	inline_dentry = inline_data_addr(ipage);
201a05be	296
7b3cd7d6 JK	297	make_dentry_ptr(&d, (void *)inline_dentry, 2);
	298	de = find_target_dentry(name, NULL, &d);
	299
201a05be	300	unlock_page(ipage);
4e6ebf6d JK	301	if (de)
	302	*res_page = ipage;
	303	else
	304	f2fs_put_page(ipage, 0);
	305
	306	/*
	307	* For the most part, it should be a bug when name_len is zero.
	308	* We stop here for figuring out where the bugs has occurred.
	309	*/
7b3cd7d6	310	f2fs_bug_on(sbi, d.max < 0);
201a05be CY	311	return de;
	312	}
	313
	314	struct f2fs_dir_entry f2fs_parent_inline_dir(struct inode dir,
	315	struct page **p)
	316	{
	317	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	318	struct page *ipage;
	319	struct f2fs_dir_entry *de;
	320	struct f2fs_inline_dentry *dentry_blk;
	321
	322	ipage = get_node_page(sbi, dir->i_ino);
	323	if (IS_ERR(ipage))
	324	return NULL;
	325
	326	dentry_blk = inline_data_addr(ipage);
	327	de = &dentry_blk->dentry[1];
	328	*p = ipage;
	329	unlock_page(ipage);
	330	return de;
	331	}
	332
	333	int make_empty_inline_dir(struct inode inode, struct inode parent,
	334	struct page *ipage)
	335	{
	336	struct f2fs_inline_dentry *dentry_blk;
062a3e7b	337	struct f2fs_dentry_ptr d;
201a05be CY	338
	339	dentry_blk = inline_data_addr(ipage);
	340
062a3e7b JK	341	make_dentry_ptr(&d, (void *)dentry_blk, 2);
062a3e7b JK	342	do_make_empty_dir(inode, parent, &d);
201a05be CY	343
	344	set_page_dirty(ipage);
	345
	346	/* update i_size to MAX_INLINE_DATA */
	347	if (i_size_read(inode) < MAX_INLINE_DATA) {
	348	i_size_write(inode, MAX_INLINE_DATA);
	349	set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
	350	}
	351	return 0;
	352	}
	353
d64948a4	354	static int f2fs_convert_inline_dir(struct inode dir, struct page ipage,
201a05be CY	355	struct f2fs_inline_dentry *inline_dentry)
	356	{
	357	struct page *page;
	358	struct dnode_of_data dn;
	359	struct f2fs_dentry_block *dentry_blk;
	360	int err;
	361
	362	page = grab_cache_page(dir->i_mapping, 0);
	363	if (!page)
	364	return -ENOMEM;
	365
	366	set_new_dnode(&dn, dir, ipage, NULL, 0);
	367	err = f2fs_reserve_block(&dn, 0);
	368	if (err)
	369	goto out;
	370
	371	f2fs_wait_on_page_writeback(page, DATA);
	372	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
	373
f1e33a04	374	dentry_blk = kmap_atomic(page);
201a05be CY	375
	376	/* copy data from inline dentry block to new dentry block */
	377	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
	378	INLINE_DENTRY_BITMAP_SIZE);
	379	memcpy(dentry_blk->dentry, inline_dentry->dentry,
	380	sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
	381	memcpy(dentry_blk->filename, inline_dentry->filename,
	382	NR_INLINE_DENTRY * F2FS_SLOT_LEN);
	383
f1e33a04	384	kunmap_atomic(dentry_blk);
201a05be CY	385	SetPageUptodate(page);
	386	set_page_dirty(page);
	387
	388	/* clear inline dir and flag after data writeback */
0bfcfcca	389	truncate_inline_inode(ipage, 0);
b3d208f9	390
3289c061	391	stat_dec_inline_dir(dir);
622f28ae	392	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
201a05be CY	393
	394	if (i_size_read(dir) < PAGE_CACHE_SIZE) {
	395	i_size_write(dir, PAGE_CACHE_SIZE);
	396	set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	397	}
	398
	399	sync_inode_page(&dn);
	400	out:
	401	f2fs_put_page(page, 1);
	402	return err;
	403	}
	404
	405	int f2fs_add_inline_entry(struct inode dir, const struct qstr name,
510022a8	406	struct inode *inode, nid_t ino, umode_t mode)
201a05be CY	407	{
	408	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	409	struct page *ipage;
	410	unsigned int bit_pos;
	411	f2fs_hash_t name_hash;
201a05be CY	412	size_t namelen = name->len;
201a05be CY	413	struct f2fs_inline_dentry *dentry_blk = NULL;
3b4d732a	414	struct f2fs_dentry_ptr d;
201a05be	415	int slots = GET_DENTRY_SLOTS(namelen);
510022a8	416	struct page *page = NULL;
201a05be	417	int err = 0;
201a05be CY	418
	419	ipage = get_node_page(sbi, dir->i_ino);
	420	if (IS_ERR(ipage))
	421	return PTR_ERR(ipage);
	422
	423	dentry_blk = inline_data_addr(ipage);
a82afa20 JK	424	bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
a82afa20 JK	425	slots, NR_INLINE_DENTRY);
201a05be CY	426	if (bit_pos >= NR_INLINE_DENTRY) {
	427	err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
	428	if (!err)
	429	err = -EAGAIN;
	430	goto out;
	431	}
	432
510022a8 JK	433	if (inode) {
	434	down_write(&F2FS_I(inode)->i_sem);
	435	page = init_inode_metadata(inode, dir, name, ipage);
	436	if (IS_ERR(page)) {
	437	err = PTR_ERR(page);
	438	goto fail;
	439	}
201a05be	440	}
bce8d112 JK	441
bce8d112 JK	442	f2fs_wait_on_page_writeback(ipage, NODE);
3b4d732a CY	443
	444	name_hash = f2fs_dentry_hash(name);
	445	make_dentry_ptr(&d, (void *)dentry_blk, 2);
510022a8	446	f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
3b4d732a	447
201a05be CY	448	set_page_dirty(ipage);
	449
	450	/* we don't need to mark_inode_dirty now */
510022a8 JK	451	if (inode) {
	452	F2FS_I(inode)->i_pino = dir->i_ino;
	453	update_inode(inode, page);
	454	f2fs_put_page(page, 1);
	455	}
201a05be CY	456
	457	update_parent_metadata(dir, inode, 0);
	458	fail:
510022a8 JK	459	if (inode)
510022a8 JK	460	up_write(&F2FS_I(inode)->i_sem);
201a05be CY	461
	462	if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
	463	update_inode(dir, ipage);
	464	clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
	465	}
	466	out:
	467	f2fs_put_page(ipage, 1);
	468	return err;
	469	}
	470
	471	void f2fs_delete_inline_entry(struct f2fs_dir_entry dentry, struct page page,
	472	struct inode dir, struct inode inode)
	473	{
	474	struct f2fs_inline_dentry *inline_dentry;
	475	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
	476	unsigned int bit_pos;
	477	int i;
	478
	479	lock_page(page);
59a06155	480	f2fs_wait_on_page_writeback(page, NODE);
201a05be CY	481
	482	inline_dentry = inline_data_addr(page);
	483	bit_pos = dentry - inline_dentry->dentry;
	484	for (i = 0; i < slots; i++)
	485	test_and_clear_bit_le(bit_pos + i,
	486	&inline_dentry->dentry_bitmap);
	487
	488	set_page_dirty(page);
	489
	490	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	491
	492	if (inode)
	493	f2fs_drop_nlink(dir, inode, page);
	494
	495	f2fs_put_page(page, 1);
	496	}
	497
	498	bool f2fs_empty_inline_dir(struct inode *dir)
	499	{
	500	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	501	struct page *ipage;
	502	unsigned int bit_pos = 2;
	503	struct f2fs_inline_dentry *dentry_blk;
	504
	505	ipage = get_node_page(sbi, dir->i_ino);
	506	if (IS_ERR(ipage))
	507	return false;
	508
	509	dentry_blk = inline_data_addr(ipage);
	510	bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
	511	NR_INLINE_DENTRY,
	512	bit_pos);
	513
	514	f2fs_put_page(ipage, 1);
	515
	516	if (bit_pos < NR_INLINE_DENTRY)
	517	return false;
	518
	519	return true;
	520	}
	521
	522	int f2fs_read_inline_dir(struct file file, struct dir_context ctx)
	523	{
	524	struct inode *inode = file_inode(file);
201a05be	525	struct f2fs_inline_dentry *inline_dentry = NULL;
201a05be	526	struct page *ipage = NULL;
7b3cd7d6	527	struct f2fs_dentry_ptr d;
201a05be CY	528
	529	if (ctx->pos == NR_INLINE_DENTRY)
	530	return 0;
	531
38594de7	532	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
201a05be CY	533	if (IS_ERR(ipage))
	534	return PTR_ERR(ipage);
	535
201a05be	536	inline_dentry = inline_data_addr(ipage);
201a05be	537
7b3cd7d6 JK	538	make_dentry_ptr(&d, (void *)inline_dentry, 2);
	539
	540	if (!f2fs_fill_dentries(ctx, &d, 0))
38594de7	541	ctx->pos = NR_INLINE_DENTRY;
201a05be	542
38594de7	543	f2fs_put_page(ipage, 1);
201a05be CY	544	return 0;
201a05be CY	545	}