[deliverable/linux.git] / fs / f2fs / namei.c

/*
 * fs/f2fs/namei.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/dcache.h>

#include "f2fs.h"
#include "node.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.h>

static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	nid_t ino;
	struct inode *inode;
	bool nid_free = false;
	int err;

	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	f2fs_lock_op(sbi);
	if (!alloc_nid(sbi, &ino)) {
		f2fs_unlock_op(sbi);
		err = -ENOSPC;
		goto fail;
	}
	f2fs_unlock_op(sbi);

	inode_init_owner(inode, dir, mode);

	inode->i_ino = ino;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	inode->i_generation = sbi->s_next_generation++;

	err = insert_inode_locked(inode);
	if (err) {
		err = -EINVAL;
		nid_free = true;
		goto out;
	}
	trace_f2fs_new_inode(inode, 0);
	mark_inode_dirty(inode);
	return inode;

out:
	clear_nlink(inode);
	unlock_new_inode(inode);
fail:
	trace_f2fs_new_inode(inode, err);
	make_bad_inode(inode);
	iput(inode);
	if (nid_free)
		alloc_nid_failed(sbi, ino);
	return ERR_PTR(err);
}

static int is_multimedia_file(const unsigned char *s, const char *sub)
{
	size_t slen = strlen(s);
	size_t sublen = strlen(sub);

	if (sublen > slen)
		return 0;

	return !strncasecmp(s + slen - sublen, sub, sublen);
}

/*
 * Set multimedia files as cold files for hot/cold data separation
 */
static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
		const unsigned char *name)
{
	int i;
	__u8 (*extlist)[8] = sbi->raw_super->extension_list;

	int count = le32_to_cpu(sbi->raw_super->extension_count);
	for (i = 0; i < count; i++) {
		if (is_multimedia_file(name, extlist[i])) {
			file_set_cold(inode);
			break;
		}
	}
}

static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
						bool excl)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	nid_t ino = 0;
	int err;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
		set_cold_files(sbi, inode, dentry->d_name.name);

	inode->i_op = &f2fs_file_inode_operations;
	inode->i_fop = &f2fs_file_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	ino = inode->i_ino;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	if (err)
		goto out;

	alloc_nid_done(sbi, ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, ino);
	return err;
}

static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	int err;

	f2fs_balance_fs(sbi);

	inode->i_ctime = CURRENT_TIME;
	ihold(inode);

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	if (err)
		goto out;

	d_instantiate(dentry, inode);
	return 0;
out:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	iput(inode);
	return err;
}

struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = QSTR_INIT("..", 2);
	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
		unsigned int flags)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (de) {
		nid_t ino = le32_to_cpu(de->ino);
		kunmap(page);
		f2fs_put_page(page, 0);

		inode = f2fs_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);

		stat_inc_inline_inode(inode);
	}

	return d_splice_alias(inode, dentry);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode = dentry->d_inode;
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	trace_f2fs_unlink_enter(dir, dentry);
	f2fs_balance_fs(sbi);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de)
		goto fail;

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		kunmap(page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, inode);
	f2fs_unlock_op(sbi);

	/* In order to evict this inode,  we set it dirty */
	mark_inode_dirty(inode);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	size_t symlen = strlen(symname) + 1;
	int err;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_symlink_inode_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	if (err)
		goto out;

	err = page_symlink(inode, symname, symlen);
	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return err;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct inode *inode;
	int err;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	if (err)
		goto out_fail;

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	return 0;

out_fail:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	if (f2fs_empty_dir(inode))
		return f2fs_unlink(dir, dentry);
	return -ENOTEMPTY;
}

static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
				umode_t mode, dev_t rdev)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	int err = 0;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_op = &f2fs_special_inode_operations;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	if (err)
		goto out;

	alloc_nid_done(sbi, inode->i_ino);
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct super_block *sb = old_dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *old_inode = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	struct page *old_dir_page;
	struct page *old_page, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	int err = -ENOENT;

	f2fs_balance_fs(sbi);

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry)
		goto out;

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry)
			goto out_old;
	}

	f2fs_lock_op(sbi);

	if (new_inode) {

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
			goto out_dir;

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		if (update_dent_inode(old_inode, &new_dentry->d_name)) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		up_write(&F2FS_I(new_inode)->i_sem);

		mark_inode_dirty(new_inode);

		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		else
			release_orphan_inode(sbi);

		update_inode_page(old_inode);
		update_inode_page(new_inode);
	} else {
		err = f2fs_add_link(new_dentry, old_inode);
		if (err)
			goto out_dir;

		if (old_dir_entry) {
			inc_nlink(new_dir);
			update_inode_page(new_dir);
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	old_inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(old_inode);

	f2fs_delete_entry(old_entry, old_page, NULL);

	if (old_dir_entry) {
		if (old_dir != new_dir) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
			update_inode_page(old_inode);
		} else {
			kunmap(old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
		mark_inode_dirty(old_dir);
		update_inode_page(old_dir);
	}

	f2fs_unlock_op(sbi);
	return 0;

put_out_dir:
	kunmap(new_page);
	f2fs_put_page(new_page, 0);
out_dir:
	if (old_dir_entry) {
		kunmap(old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
	f2fs_unlock_op(sbi);
out_old:
	kunmap(old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}

static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	int err;

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_file_inode_operations;
	inode->i_fop = &f2fs_file_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err)
		goto out;

	err = f2fs_do_tmpfile(inode, dir);
	if (err)
		goto release_out;

	/*
	 * add this non-linked tmpfile to orphan list, in this way we could
	 * remove all unused data of tmpfile after abnormal power-off.
	 */
	add_orphan_inode(sbi, inode->i_ino);
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);
	d_tmpfile(dentry, inode);
	unlock_new_inode(inode);
	return 0;

release_out:
	release_orphan_inode(sbi);
out:
	f2fs_unlock_op(sbi);
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

const struct inode_operations f2fs_dir_inode_operations = {
	.create		= f2fs_create,
	.lookup		= f2fs_lookup,
	.link		= f2fs_link,
	.unlink		= f2fs_unlink,
	.symlink	= f2fs_symlink,
	.mkdir		= f2fs_mkdir,
	.rmdir		= f2fs_rmdir,
	.mknod		= f2fs_mknod,
	.rename		= f2fs_rename,
	.tmpfile	= f2fs_tmpfile,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
	.set_acl	= f2fs_set_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_symlink_inode_operations = {
	.readlink       = generic_readlink,
	.follow_link    = page_follow_link_light,
	.put_link       = page_put_link,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_special_inode_operations = {
	.getattr	= f2fs_getattr,
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_acl,
	.set_acl	= f2fs_set_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};
Commit	Line	Data
0a8165d7	1	/*
57397d86 JK	2	* fs/f2fs/namei.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include <linux/pagemap.h>
	14	#include <linux/sched.h>
	15	#include <linux/ctype.h>
50732df0	16	#include <linux/dcache.h>
57397d86 JK	17
57397d86 JK	18	#include "f2fs.h"
953a3e27	19	#include "node.h"
57397d86 JK	20	#include "xattr.h"
57397d86 JK	21	#include "acl.h"
a2a4a7e4	22	#include <trace/events/f2fs.h>
57397d86 JK	23
	24	static struct inode f2fs_new_inode(struct inode dir, umode_t mode)
	25	{
	26	struct super_block *sb = dir->i_sb;
	27	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	28	nid_t ino;
	29	struct inode *inode;
	30	bool nid_free = false;
e479556b	31	int err;
57397d86 JK	32
	33	inode = new_inode(sb);
	34	if (!inode)
	35	return ERR_PTR(-ENOMEM);
	36
e479556b	37	f2fs_lock_op(sbi);
57397d86	38	if (!alloc_nid(sbi, &ino)) {
e479556b	39	f2fs_unlock_op(sbi);
57397d86 JK	40	err = -ENOSPC;
	41	goto fail;
	42	}
e479556b	43	f2fs_unlock_op(sbi);
57397d86	44
70ff5dfe	45	inode_init_owner(inode, dir, mode);
57397d86 JK	46
57397d86 JK	47	inode->i_ino = ino;
57397d86 JK	48	inode->i_blocks = 0;
	49	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	50	inode->i_generation = sbi->s_next_generation++;
	51
	52	err = insert_inode_locked(inode);
	53	if (err) {
	54	err = -EINVAL;
	55	nid_free = true;
	56	goto out;
	57	}
d70b4f53	58	trace_f2fs_new_inode(inode, 0);
57397d86 JK	59	mark_inode_dirty(inode);
	60	return inode;
	61
	62	out:
	63	clear_nlink(inode);
	64	unlock_new_inode(inode);
	65	fail:
d70b4f53	66	trace_f2fs_new_inode(inode, err);
531ad7d5	67	make_bad_inode(inode);
57397d86 JK	68	iput(inode);
	69	if (nid_free)
	70	alloc_nid_failed(sbi, ino);
	71	return ERR_PTR(err);
	72	}
	73
	74	static int is_multimedia_file(const unsigned char s, const char sub)
	75	{
9836b8b9 LR	76	size_t slen = strlen(s);
9836b8b9 LR	77	size_t sublen = strlen(sub);
57397d86 JK	78
57397d86 JK	79	if (sublen > slen)
e66509f0	80	return 0;
57397d86	81
749ebfd1	82	return !strncasecmp(s + slen - sublen, sub, sublen);
57397d86 JK	83	}
57397d86 JK	84
0a8165d7	85	/*
57397d86 JK	86	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	87	*/
953a3e27	88	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	89	const unsigned char *name)
	90	{
	91	int i;
	92	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	93
	94	int count = le32_to_cpu(sbi->raw_super->extension_count);
	95	for (i = 0; i < count; i++) {
e66509f0	96	if (is_multimedia_file(name, extlist[i])) {
354a3399	97	file_set_cold(inode);
57397d86 JK	98	break;
	99	}
	100	}
	101	}
	102
	103	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	104	bool excl)
	105	{
	106	struct super_block *sb = dir->i_sb;
	107	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	108	struct inode *inode;
	109	nid_t ino = 0;
e479556b	110	int err;
57397d86	111
1efef832 JK	112	f2fs_balance_fs(sbi);
1efef832 JK	113
57397d86 JK	114	inode = f2fs_new_inode(dir, mode);
	115	if (IS_ERR(inode))
	116	return PTR_ERR(inode);
	117
	118	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	119	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	120
	121	inode->i_op = &f2fs_file_inode_operations;
	122	inode->i_fop = &f2fs_file_operations;
	123	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	124	ino = inode->i_ino;
	125
e479556b	126	f2fs_lock_op(sbi);
57397d86	127	err = f2fs_add_link(dentry, inode);
e479556b	128	f2fs_unlock_op(sbi);
57397d86 JK	129	if (err)
	130	goto out;
	131
	132	alloc_nid_done(sbi, ino);
	133
0a364af1	134	d_instantiate(dentry, inode);
57397d86	135	unlock_new_inode(inode);
57397d86 JK	136	return 0;
	137	out:
	138	clear_nlink(inode);
	139	unlock_new_inode(inode);
531ad7d5	140	make_bad_inode(inode);
57397d86 JK	141	iput(inode);
	142	alloc_nid_failed(sbi, ino);
	143	return err;
	144	}
	145
	146	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	147	struct dentry *dentry)
	148	{
	149	struct inode *inode = old_dentry->d_inode;
	150	struct super_block *sb = dir->i_sb;
	151	struct f2fs_sb_info *sbi = F2FS_SB(sb);
e479556b	152	int err;
57397d86	153
1efef832 JK	154	f2fs_balance_fs(sbi);
1efef832 JK	155
57397d86	156	inode->i_ctime = CURRENT_TIME;
6f6fd833	157	ihold(inode);
57397d86 JK	158
57397d86 JK	159	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	160	f2fs_lock_op(sbi);
57397d86	161	err = f2fs_add_link(dentry, inode);
e479556b	162	f2fs_unlock_op(sbi);
57397d86 JK	163	if (err)
	164	goto out;
	165
	166	d_instantiate(dentry, inode);
57397d86 JK	167	return 0;
	168	out:
	169	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	170	iput(inode);
	171	return err;
	172	}
	173
	174	struct dentry f2fs_get_parent(struct dentry child)
	175	{
	176	struct qstr dotdot = QSTR_INIT("..", 2);
	177	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	178	if (!ino)
	179	return ERR_PTR(-ENOENT);
	180	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	181	}
	182
	183	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	184	unsigned int flags)
	185	{
	186	struct inode *inode = NULL;
	187	struct f2fs_dir_entry *de;
	188	struct page *page;
	189
5a20d339	190	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	191	return ERR_PTR(-ENAMETOOLONG);
	192
	193	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	194	if (de) {
	195	nid_t ino = le32_to_cpu(de->ino);
	196	kunmap(page);
	197	f2fs_put_page(page, 0);
	198
	199	inode = f2fs_iget(dir->i_sb, ino);
	200	if (IS_ERR(inode))
	201	return ERR_CAST(inode);
48b230a5 CY	202
48b230a5 CY	203	stat_inc_inline_inode(inode);
57397d86 JK	204	}
	205
	206	return d_splice_alias(inode, dentry);
	207	}
	208
	209	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	210	{
	211	struct super_block *sb = dir->i_sb;
	212	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	213	struct inode *inode = dentry->d_inode;
	214	struct f2fs_dir_entry *de;
	215	struct page *page;
	216	int err = -ENOENT;
	217
a2a4a7e4	218	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	219	f2fs_balance_fs(sbi);
1efef832 JK	220
57397d86 JK	221	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	222	if (!de)
	223	goto fail;
	224
ccaaca25	225	f2fs_lock_op(sbi);
cbd56e7d	226	err = acquire_orphan_inode(sbi);
57397d86	227	if (err) {
ccaaca25	228	f2fs_unlock_op(sbi);
57397d86 JK	229	kunmap(page);
	230	f2fs_put_page(page, 0);
	231	goto fail;
	232	}
57397d86	233	f2fs_delete_entry(de, page, inode);
e479556b	234	f2fs_unlock_op(sbi);
57397d86 JK	235
	236	/* In order to evict this inode, we set it dirty */
	237	mark_inode_dirty(inode);
57397d86	238	fail:
a2a4a7e4	239	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	240	return err;
	241	}
	242
	243	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	244	const char *symname)
	245	{
	246	struct super_block *sb = dir->i_sb;
	247	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	248	struct inode *inode;
9836b8b9	249	size_t symlen = strlen(symname) + 1;
e479556b	250	int err;
57397d86	251
1efef832 JK	252	f2fs_balance_fs(sbi);
1efef832 JK	253
57397d86 JK	254	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	255	if (IS_ERR(inode))
	256	return PTR_ERR(inode);
	257
	258	inode->i_op = &f2fs_symlink_inode_operations;
	259	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	260
e479556b	261	f2fs_lock_op(sbi);
57397d86	262	err = f2fs_add_link(dentry, inode);
e479556b	263	f2fs_unlock_op(sbi);
57397d86 JK	264	if (err)
	265	goto out;
	266
	267	err = page_symlink(inode, symname, symlen);
	268	alloc_nid_done(sbi, inode->i_ino);
	269
	270	d_instantiate(dentry, inode);
	271	unlock_new_inode(inode);
57397d86 JK	272	return err;
	273	out:
	274	clear_nlink(inode);
	275	unlock_new_inode(inode);
531ad7d5	276	make_bad_inode(inode);
57397d86 JK	277	iput(inode);
	278	alloc_nid_failed(sbi, inode->i_ino);
	279	return err;
	280	}
	281
	282	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	283	{
	284	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	285	struct inode *inode;
e479556b	286	int err;
57397d86	287
1efef832 JK	288	f2fs_balance_fs(sbi);
1efef832 JK	289
57397d86	290	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	291	if (IS_ERR(inode))
61412b64	292	return PTR_ERR(inode);
57397d86 JK	293
	294	inode->i_op = &f2fs_dir_inode_operations;
	295	inode->i_fop = &f2fs_dir_operations;
	296	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	297	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	298
57397d86 JK	299	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	300	f2fs_lock_op(sbi);
57397d86	301	err = f2fs_add_link(dentry, inode);
e479556b	302	f2fs_unlock_op(sbi);
57397d86 JK	303	if (err)
	304	goto out_fail;
	305
	306	alloc_nid_done(sbi, inode->i_ino);
	307
	308	d_instantiate(dentry, inode);
	309	unlock_new_inode(inode);
	310
57397d86 JK	311	return 0;
	312
	313	out_fail:
	314	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	315	clear_nlink(inode);
	316	unlock_new_inode(inode);
531ad7d5	317	make_bad_inode(inode);
57397d86 JK	318	iput(inode);
	319	alloc_nid_failed(sbi, inode->i_ino);
	320	return err;
	321	}
	322
	323	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	324	{
	325	struct inode *inode = dentry->d_inode;
	326	if (f2fs_empty_dir(inode))
	327	return f2fs_unlink(dir, dentry);
	328	return -ENOTEMPTY;
	329	}
	330
	331	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	332	umode_t mode, dev_t rdev)
	333	{
	334	struct super_block *sb = dir->i_sb;
	335	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	336	struct inode *inode;
	337	int err = 0;
	338
	339	if (!new_valid_dev(rdev))
	340	return -EINVAL;
	341
1efef832 JK	342	f2fs_balance_fs(sbi);
1efef832 JK	343
57397d86 JK	344	inode = f2fs_new_inode(dir, mode);
	345	if (IS_ERR(inode))
	346	return PTR_ERR(inode);
	347
	348	init_special_inode(inode, inode->i_mode, rdev);
	349	inode->i_op = &f2fs_special_inode_operations;
	350
e479556b	351	f2fs_lock_op(sbi);
57397d86	352	err = f2fs_add_link(dentry, inode);
e479556b	353	f2fs_unlock_op(sbi);
57397d86 JK	354	if (err)
	355	goto out;
	356
	357	alloc_nid_done(sbi, inode->i_ino);
	358	d_instantiate(dentry, inode);
	359	unlock_new_inode(inode);
57397d86 JK	360	return 0;
	361	out:
	362	clear_nlink(inode);
	363	unlock_new_inode(inode);
531ad7d5	364	make_bad_inode(inode);
57397d86 JK	365	iput(inode);
	366	alloc_nid_failed(sbi, inode->i_ino);
	367	return err;
	368	}
	369
	370	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	371	struct inode new_dir, struct dentry new_dentry)
	372	{
	373	struct super_block *sb = old_dir->i_sb;
	374	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	375	struct inode *old_inode = old_dentry->d_inode;
	376	struct inode *new_inode = new_dentry->d_inode;
	377	struct page *old_dir_page;
cbd56e7d	378	struct page old_page, new_page;
57397d86 JK	379	struct f2fs_dir_entry *old_dir_entry = NULL;
	380	struct f2fs_dir_entry *old_entry;
	381	struct f2fs_dir_entry *new_entry;
e479556b	382	int err = -ENOENT;
57397d86	383
1efef832 JK	384	f2fs_balance_fs(sbi);
1efef832 JK	385
57397d86 JK	386	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	387	if (!old_entry)
	388	goto out;
	389
	390	if (S_ISDIR(old_inode->i_mode)) {
	391	err = -EIO;
	392	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	393	if (!old_dir_entry)
	394	goto out_old;
	395	}
	396
e479556b	397	f2fs_lock_op(sbi);
57397d86 JK	398
57397d86 JK	399	if (new_inode) {
57397d86 JK	400
	401	err = -ENOTEMPTY;
	402	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	403	goto out_dir;
	404
	405	err = -ENOENT;
	406	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	407	&new_page);
	408	if (!new_entry)
	409	goto out_dir;
	410
cbd56e7d JK	411	err = acquire_orphan_inode(sbi);
	412	if (err)
	413	goto put_out_dir;
	414
1cd14caf	415	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
cbd56e7d JK	416	release_orphan_inode(sbi);
cbd56e7d JK	417	goto put_out_dir;
1cd14caf JK	418	}
1cd14caf JK	419
57397d86 JK	420	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	421
	422	new_inode->i_ctime = CURRENT_TIME;
d928bfbf	423	down_write(&F2FS_I(new_inode)->i_sem);
57397d86 JK	424	if (old_dir_entry)
	425	drop_nlink(new_inode);
	426	drop_nlink(new_inode);
d928bfbf JK	427	up_write(&F2FS_I(new_inode)->i_sem);
d928bfbf JK	428
a18ff063	429	mark_inode_dirty(new_inode);
cbd56e7d	430
57397d86 JK	431	if (!new_inode->i_nlink)
57397d86 JK	432	add_orphan_inode(sbi, new_inode->i_ino);
cbd56e7d JK	433	else
	434	release_orphan_inode(sbi);
	435
8cb82688	436	update_inode_page(old_inode);
39936837	437	update_inode_page(new_inode);
57397d86 JK	438	} else {
	439	err = f2fs_add_link(new_dentry, old_inode);
	440	if (err)
	441	goto out_dir;
	442
	443	if (old_dir_entry) {
	444	inc_nlink(new_dir);
39936837	445	update_inode_page(new_dir);
57397d86 JK	446	}
	447	}
	448
b2c08299 JK	449	down_write(&F2FS_I(old_inode)->i_sem);
	450	file_lost_pino(old_inode);
	451	up_write(&F2FS_I(old_inode)->i_sem);
	452
57397d86	453	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	454	mark_inode_dirty(old_inode);
	455
	456	f2fs_delete_entry(old_entry, old_page, NULL);
	457
	458	if (old_dir_entry) {
	459	if (old_dir != new_dir) {
	460	f2fs_set_link(old_inode, old_dir_entry,
	461	old_dir_page, new_dir);
a18ff063	462	update_inode_page(old_inode);
57397d86 JK	463	} else {
	464	kunmap(old_dir_page);
	465	f2fs_put_page(old_dir_page, 0);
	466	}
	467	drop_nlink(old_dir);
a18ff063	468	mark_inode_dirty(old_dir);
39936837	469	update_inode_page(old_dir);
57397d86 JK	470	}
57397d86 JK	471
e479556b	472	f2fs_unlock_op(sbi);
57397d86 JK	473	return 0;
57397d86 JK	474
cbd56e7d	475	put_out_dir:
dd4d961f CY	476	kunmap(new_page);
dd4d961f CY	477	f2fs_put_page(new_page, 0);
57397d86 JK	478	out_dir:
	479	if (old_dir_entry) {
	480	kunmap(old_dir_page);
	481	f2fs_put_page(old_dir_page, 0);
	482	}
e479556b	483	f2fs_unlock_op(sbi);
57397d86 JK	484	out_old:
	485	kunmap(old_page);
	486	f2fs_put_page(old_page, 0);
	487	out:
	488	return err;
	489	}
	490
50732df0 CY	491	static int f2fs_tmpfile(struct inode dir, struct dentry dentry, umode_t mode)
	492	{
	493	struct super_block *sb = dir->i_sb;
	494	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	495	struct inode *inode;
50732df0 CY	496	int err;
	497
	498	inode = f2fs_new_inode(dir, mode);
	499	if (IS_ERR(inode))
	500	return PTR_ERR(inode);
	501
	502	inode->i_op = &f2fs_file_inode_operations;
	503	inode->i_fop = &f2fs_file_operations;
	504	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	505
	506	f2fs_lock_op(sbi);
	507	err = acquire_orphan_inode(sbi);
	508	if (err)
	509	goto out;
b97a9b5d JK	510
	511	err = f2fs_do_tmpfile(inode, dir);
	512	if (err)
	513	goto release_out;
	514
50732df0 CY	515	/*
	516	* add this non-linked tmpfile to orphan list, in this way we could
	517	* remove all unused data of tmpfile after abnormal power-off.
	518	*/
	519	add_orphan_inode(sbi, inode->i_ino);
50732df0 CY	520	f2fs_unlock_op(sbi);
	521
	522	alloc_nid_done(sbi, inode->i_ino);
50732df0 CY	523	d_tmpfile(dentry, inode);
	524	unlock_new_inode(inode);
	525	return 0;
b97a9b5d JK	526
	527	release_out:
	528	release_orphan_inode(sbi);
50732df0 CY	529	out:
	530	f2fs_unlock_op(sbi);
	531	clear_nlink(inode);
	532	unlock_new_inode(inode);
	533	make_bad_inode(inode);
	534	iput(inode);
	535	alloc_nid_failed(sbi, inode->i_ino);
	536	return err;
	537	}
	538
57397d86 JK	539	const struct inode_operations f2fs_dir_inode_operations = {
	540	.create = f2fs_create,
	541	.lookup = f2fs_lookup,
	542	.link = f2fs_link,
	543	.unlink = f2fs_unlink,
	544	.symlink = f2fs_symlink,
	545	.mkdir = f2fs_mkdir,
	546	.rmdir = f2fs_rmdir,
	547	.mknod = f2fs_mknod,
	548	.rename = f2fs_rename,
50732df0	549	.tmpfile = f2fs_tmpfile,
2d4d9fb5	550	.getattr = f2fs_getattr,
57397d86 JK	551	.setattr = f2fs_setattr,
57397d86 JK	552	.get_acl = f2fs_get_acl,
a6dda0e6	553	.set_acl = f2fs_set_acl,
57397d86 JK	554	#ifdef CONFIG_F2FS_FS_XATTR
	555	.setxattr = generic_setxattr,
	556	.getxattr = generic_getxattr,
	557	.listxattr = f2fs_listxattr,
	558	.removexattr = generic_removexattr,
	559	#endif
	560	};
	561
	562	const struct inode_operations f2fs_symlink_inode_operations = {
	563	.readlink = generic_readlink,
	564	.follow_link = page_follow_link_light,
	565	.put_link = page_put_link,
2d4d9fb5	566	.getattr = f2fs_getattr,
57397d86 JK	567	.setattr = f2fs_setattr,
	568	#ifdef CONFIG_F2FS_FS_XATTR
	569	.setxattr = generic_setxattr,
	570	.getxattr = generic_getxattr,
	571	.listxattr = f2fs_listxattr,
	572	.removexattr = generic_removexattr,
	573	#endif
	574	};
	575
	576	const struct inode_operations f2fs_special_inode_operations = {
2d4d9fb5	577	.getattr = f2fs_getattr,
57397d86 JK	578	.setattr = f2fs_setattr,
57397d86 JK	579	.get_acl = f2fs_get_acl,
a6dda0e6	580	.set_acl = f2fs_set_acl,
57397d86 JK	581	#ifdef CONFIG_F2FS_FS_XATTR
	582	.setxattr = generic_setxattr,
	583	.getxattr = generic_getxattr,
	584	.listxattr = f2fs_listxattr,
	585	.removexattr = generic_removexattr,
	586	#endif
	587	};