[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 "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);
		down_write(&F2FS_I(old_inode)->i_sem);
		F2FS_I(old_inode)->i_pino = new_dir->i_ino;
		up_write(&F2FS_I(old_inode)->i_sem);

		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);
		}
	}

	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);
			down_write(&F2FS_I(old_inode)->i_sem);
			F2FS_I(old_inode)->i_pino = new_dir->i_ino;
			up_write(&F2FS_I(old_inode)->i_sem);
			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:
	f2fs_put_page(new_page, 1);
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;
}

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,
	.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>
	16
	17	#include "f2fs.h"
953a3e27	18	#include "node.h"
57397d86 JK	19	#include "xattr.h"
57397d86 JK	20	#include "acl.h"
a2a4a7e4	21	#include <trace/events/f2fs.h>
57397d86 JK	22
	23	static struct inode f2fs_new_inode(struct inode dir, umode_t mode)
	24	{
	25	struct super_block *sb = dir->i_sb;
	26	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	27	nid_t ino;
	28	struct inode *inode;
	29	bool nid_free = false;
e479556b	30	int err;
57397d86 JK	31
	32	inode = new_inode(sb);
	33	if (!inode)
	34	return ERR_PTR(-ENOMEM);
	35
e479556b	36	f2fs_lock_op(sbi);
57397d86	37	if (!alloc_nid(sbi, &ino)) {
e479556b	38	f2fs_unlock_op(sbi);
57397d86 JK	39	err = -ENOSPC;
	40	goto fail;
	41	}
e479556b	42	f2fs_unlock_op(sbi);
57397d86	43
70ff5dfe	44	inode_init_owner(inode, dir, mode);
57397d86 JK	45
57397d86 JK	46	inode->i_ino = ino;
57397d86 JK	47	inode->i_blocks = 0;
	48	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	49	inode->i_generation = sbi->s_next_generation++;
	50
	51	err = insert_inode_locked(inode);
	52	if (err) {
	53	err = -EINVAL;
	54	nid_free = true;
	55	goto out;
	56	}
d70b4f53	57	trace_f2fs_new_inode(inode, 0);
57397d86 JK	58	mark_inode_dirty(inode);
	59	return inode;
	60
	61	out:
	62	clear_nlink(inode);
	63	unlock_new_inode(inode);
	64	fail:
d70b4f53	65	trace_f2fs_new_inode(inode, err);
531ad7d5	66	make_bad_inode(inode);
57397d86 JK	67	iput(inode);
	68	if (nid_free)
	69	alloc_nid_failed(sbi, ino);
	70	return ERR_PTR(err);
	71	}
	72
	73	static int is_multimedia_file(const unsigned char s, const char sub)
	74	{
9836b8b9 LR	75	size_t slen = strlen(s);
9836b8b9 LR	76	size_t sublen = strlen(sub);
57397d86 JK	77
57397d86 JK	78	if (sublen > slen)
e66509f0	79	return 0;
57397d86	80
749ebfd1	81	return !strncasecmp(s + slen - sublen, sub, sublen);
57397d86 JK	82	}
57397d86 JK	83
0a8165d7	84	/*
57397d86 JK	85	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	86	*/
953a3e27	87	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	88	const unsigned char *name)
	89	{
	90	int i;
	91	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	92
	93	int count = le32_to_cpu(sbi->raw_super->extension_count);
	94	for (i = 0; i < count; i++) {
e66509f0	95	if (is_multimedia_file(name, extlist[i])) {
354a3399	96	file_set_cold(inode);
57397d86 JK	97	break;
	98	}
	99	}
	100	}
	101
	102	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	103	bool excl)
	104	{
	105	struct super_block *sb = dir->i_sb;
	106	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	107	struct inode *inode;
	108	nid_t ino = 0;
e479556b	109	int err;
57397d86	110
1efef832 JK	111	f2fs_balance_fs(sbi);
1efef832 JK	112
57397d86 JK	113	inode = f2fs_new_inode(dir, mode);
	114	if (IS_ERR(inode))
	115	return PTR_ERR(inode);
	116
	117	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	118	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	119
	120	inode->i_op = &f2fs_file_inode_operations;
	121	inode->i_fop = &f2fs_file_operations;
	122	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	123	ino = inode->i_ino;
	124
e479556b	125	f2fs_lock_op(sbi);
57397d86	126	err = f2fs_add_link(dentry, inode);
e479556b	127	f2fs_unlock_op(sbi);
57397d86 JK	128	if (err)
	129	goto out;
	130
	131	alloc_nid_done(sbi, ino);
	132
0a364af1	133	d_instantiate(dentry, inode);
57397d86	134	unlock_new_inode(inode);
57397d86 JK	135	return 0;
	136	out:
	137	clear_nlink(inode);
	138	unlock_new_inode(inode);
531ad7d5	139	make_bad_inode(inode);
57397d86 JK	140	iput(inode);
	141	alloc_nid_failed(sbi, ino);
	142	return err;
	143	}
	144
	145	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	146	struct dentry *dentry)
	147	{
	148	struct inode *inode = old_dentry->d_inode;
	149	struct super_block *sb = dir->i_sb;
	150	struct f2fs_sb_info *sbi = F2FS_SB(sb);
e479556b	151	int err;
57397d86	152
1efef832 JK	153	f2fs_balance_fs(sbi);
1efef832 JK	154
57397d86	155	inode->i_ctime = CURRENT_TIME;
6f6fd833	156	ihold(inode);
57397d86 JK	157
57397d86 JK	158	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	159	f2fs_lock_op(sbi);
57397d86	160	err = f2fs_add_link(dentry, inode);
e479556b	161	f2fs_unlock_op(sbi);
57397d86 JK	162	if (err)
	163	goto out;
	164
	165	d_instantiate(dentry, inode);
57397d86 JK	166	return 0;
	167	out:
	168	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	169	iput(inode);
	170	return err;
	171	}
	172
	173	struct dentry f2fs_get_parent(struct dentry child)
	174	{
	175	struct qstr dotdot = QSTR_INIT("..", 2);
	176	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	177	if (!ino)
	178	return ERR_PTR(-ENOENT);
	179	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	180	}
	181
	182	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	183	unsigned int flags)
	184	{
	185	struct inode *inode = NULL;
	186	struct f2fs_dir_entry *de;
	187	struct page *page;
	188
5a20d339	189	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	190	return ERR_PTR(-ENAMETOOLONG);
	191
	192	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	193	if (de) {
	194	nid_t ino = le32_to_cpu(de->ino);
	195	kunmap(page);
	196	f2fs_put_page(page, 0);
	197
	198	inode = f2fs_iget(dir->i_sb, ino);
	199	if (IS_ERR(inode))
	200	return ERR_CAST(inode);
48b230a5 CY	201
48b230a5 CY	202	stat_inc_inline_inode(inode);
57397d86 JK	203	}
	204
	205	return d_splice_alias(inode, dentry);
	206	}
	207
	208	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	209	{
	210	struct super_block *sb = dir->i_sb;
	211	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	212	struct inode *inode = dentry->d_inode;
	213	struct f2fs_dir_entry *de;
	214	struct page *page;
	215	int err = -ENOENT;
	216
a2a4a7e4	217	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	218	f2fs_balance_fs(sbi);
1efef832 JK	219
57397d86 JK	220	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	221	if (!de)
	222	goto fail;
	223
ccaaca25	224	f2fs_lock_op(sbi);
cbd56e7d	225	err = acquire_orphan_inode(sbi);
57397d86	226	if (err) {
ccaaca25	227	f2fs_unlock_op(sbi);
57397d86 JK	228	kunmap(page);
	229	f2fs_put_page(page, 0);
	230	goto fail;
	231	}
57397d86	232	f2fs_delete_entry(de, page, inode);
e479556b	233	f2fs_unlock_op(sbi);
57397d86 JK	234
	235	/* In order to evict this inode, we set it dirty */
	236	mark_inode_dirty(inode);
57397d86	237	fail:
a2a4a7e4	238	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	239	return err;
	240	}
	241
	242	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	243	const char *symname)
	244	{
	245	struct super_block *sb = dir->i_sb;
	246	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	247	struct inode *inode;
9836b8b9	248	size_t symlen = strlen(symname) + 1;
e479556b	249	int err;
57397d86	250
1efef832 JK	251	f2fs_balance_fs(sbi);
1efef832 JK	252
57397d86 JK	253	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	254	if (IS_ERR(inode))
	255	return PTR_ERR(inode);
	256
	257	inode->i_op = &f2fs_symlink_inode_operations;
	258	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	259
e479556b	260	f2fs_lock_op(sbi);
57397d86	261	err = f2fs_add_link(dentry, inode);
e479556b	262	f2fs_unlock_op(sbi);
57397d86 JK	263	if (err)
	264	goto out;
	265
	266	err = page_symlink(inode, symname, symlen);
	267	alloc_nid_done(sbi, inode->i_ino);
	268
	269	d_instantiate(dentry, inode);
	270	unlock_new_inode(inode);
57397d86 JK	271	return err;
	272	out:
	273	clear_nlink(inode);
	274	unlock_new_inode(inode);
531ad7d5	275	make_bad_inode(inode);
57397d86 JK	276	iput(inode);
	277	alloc_nid_failed(sbi, inode->i_ino);
	278	return err;
	279	}
	280
	281	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	282	{
	283	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	284	struct inode *inode;
e479556b	285	int err;
57397d86	286
1efef832 JK	287	f2fs_balance_fs(sbi);
1efef832 JK	288
57397d86	289	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	290	if (IS_ERR(inode))
61412b64	291	return PTR_ERR(inode);
57397d86 JK	292
	293	inode->i_op = &f2fs_dir_inode_operations;
	294	inode->i_fop = &f2fs_dir_operations;
	295	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	296	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	297
57397d86 JK	298	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	299	f2fs_lock_op(sbi);
57397d86	300	err = f2fs_add_link(dentry, inode);
e479556b	301	f2fs_unlock_op(sbi);
57397d86 JK	302	if (err)
	303	goto out_fail;
	304
	305	alloc_nid_done(sbi, inode->i_ino);
	306
	307	d_instantiate(dentry, inode);
	308	unlock_new_inode(inode);
	309
57397d86 JK	310	return 0;
	311
	312	out_fail:
	313	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	314	clear_nlink(inode);
	315	unlock_new_inode(inode);
531ad7d5	316	make_bad_inode(inode);
57397d86 JK	317	iput(inode);
	318	alloc_nid_failed(sbi, inode->i_ino);
	319	return err;
	320	}
	321
	322	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	323	{
	324	struct inode *inode = dentry->d_inode;
	325	if (f2fs_empty_dir(inode))
	326	return f2fs_unlink(dir, dentry);
	327	return -ENOTEMPTY;
	328	}
	329
	330	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	331	umode_t mode, dev_t rdev)
	332	{
	333	struct super_block *sb = dir->i_sb;
	334	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	335	struct inode *inode;
	336	int err = 0;
	337
	338	if (!new_valid_dev(rdev))
	339	return -EINVAL;
	340
1efef832 JK	341	f2fs_balance_fs(sbi);
1efef832 JK	342
57397d86 JK	343	inode = f2fs_new_inode(dir, mode);
	344	if (IS_ERR(inode))
	345	return PTR_ERR(inode);
	346
	347	init_special_inode(inode, inode->i_mode, rdev);
	348	inode->i_op = &f2fs_special_inode_operations;
	349
e479556b	350	f2fs_lock_op(sbi);
57397d86	351	err = f2fs_add_link(dentry, inode);
e479556b	352	f2fs_unlock_op(sbi);
57397d86 JK	353	if (err)
	354	goto out;
	355
	356	alloc_nid_done(sbi, inode->i_ino);
	357	d_instantiate(dentry, inode);
	358	unlock_new_inode(inode);
57397d86 JK	359	return 0;
	360	out:
	361	clear_nlink(inode);
	362	unlock_new_inode(inode);
531ad7d5	363	make_bad_inode(inode);
57397d86 JK	364	iput(inode);
	365	alloc_nid_failed(sbi, inode->i_ino);
	366	return err;
	367	}
	368
	369	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	370	struct inode new_dir, struct dentry new_dentry)
	371	{
	372	struct super_block *sb = old_dir->i_sb;
	373	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	374	struct inode *old_inode = old_dentry->d_inode;
	375	struct inode *new_inode = new_dentry->d_inode;
	376	struct page *old_dir_page;
cbd56e7d	377	struct page old_page, new_page;
57397d86 JK	378	struct f2fs_dir_entry *old_dir_entry = NULL;
	379	struct f2fs_dir_entry *old_entry;
	380	struct f2fs_dir_entry *new_entry;
e479556b	381	int err = -ENOENT;
57397d86	382
1efef832 JK	383	f2fs_balance_fs(sbi);
1efef832 JK	384
57397d86 JK	385	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	386	if (!old_entry)
	387	goto out;
	388
	389	if (S_ISDIR(old_inode->i_mode)) {
	390	err = -EIO;
	391	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	392	if (!old_dir_entry)
	393	goto out_old;
	394	}
	395
e479556b	396	f2fs_lock_op(sbi);
57397d86 JK	397
57397d86 JK	398	if (new_inode) {
57397d86 JK	399
	400	err = -ENOTEMPTY;
	401	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	402	goto out_dir;
	403
	404	err = -ENOENT;
	405	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	406	&new_page);
	407	if (!new_entry)
	408	goto out_dir;
	409
cbd56e7d JK	410	err = acquire_orphan_inode(sbi);
	411	if (err)
	412	goto put_out_dir;
	413
1cd14caf	414	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
cbd56e7d JK	415	release_orphan_inode(sbi);
cbd56e7d JK	416	goto put_out_dir;
1cd14caf JK	417	}
1cd14caf JK	418
57397d86	419	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
d928bfbf	420	down_write(&F2FS_I(old_inode)->i_sem);
deead090	421	F2FS_I(old_inode)->i_pino = new_dir->i_ino;
d928bfbf	422	up_write(&F2FS_I(old_inode)->i_sem);
57397d86 JK	423
57397d86 JK	424	new_inode->i_ctime = CURRENT_TIME;
d928bfbf	425	down_write(&F2FS_I(new_inode)->i_sem);
57397d86 JK	426	if (old_dir_entry)
	427	drop_nlink(new_inode);
	428	drop_nlink(new_inode);
d928bfbf JK	429	up_write(&F2FS_I(new_inode)->i_sem);
d928bfbf JK	430
a18ff063	431	mark_inode_dirty(new_inode);
cbd56e7d	432
57397d86 JK	433	if (!new_inode->i_nlink)
57397d86 JK	434	add_orphan_inode(sbi, new_inode->i_ino);
cbd56e7d JK	435	else
	436	release_orphan_inode(sbi);
	437
8cb82688	438	update_inode_page(old_inode);
39936837	439	update_inode_page(new_inode);
57397d86 JK	440	} else {
	441	err = f2fs_add_link(new_dentry, old_inode);
	442	if (err)
	443	goto out_dir;
	444
	445	if (old_dir_entry) {
	446	inc_nlink(new_dir);
39936837	447	update_inode_page(new_dir);
57397d86 JK	448	}
	449	}
	450
	451	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	452	mark_inode_dirty(old_inode);
	453
	454	f2fs_delete_entry(old_entry, old_page, NULL);
	455
	456	if (old_dir_entry) {
	457	if (old_dir != new_dir) {
	458	f2fs_set_link(old_inode, old_dir_entry,
	459	old_dir_page, new_dir);
d928bfbf	460	down_write(&F2FS_I(old_inode)->i_sem);
deead090	461	F2FS_I(old_inode)->i_pino = new_dir->i_ino;
d928bfbf	462	up_write(&F2FS_I(old_inode)->i_sem);
a18ff063	463	update_inode_page(old_inode);
57397d86 JK	464	} else {
	465	kunmap(old_dir_page);
	466	f2fs_put_page(old_dir_page, 0);
	467	}
	468	drop_nlink(old_dir);
a18ff063	469	mark_inode_dirty(old_dir);
39936837	470	update_inode_page(old_dir);
57397d86 JK	471	}
57397d86 JK	472
e479556b	473	f2fs_unlock_op(sbi);
57397d86 JK	474	return 0;
57397d86 JK	475
cbd56e7d JK	476	put_out_dir:
cbd56e7d JK	477	f2fs_put_page(new_page, 1);
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
	491	const struct inode_operations f2fs_dir_inode_operations = {
	492	.create = f2fs_create,
	493	.lookup = f2fs_lookup,
	494	.link = f2fs_link,
	495	.unlink = f2fs_unlink,
	496	.symlink = f2fs_symlink,
	497	.mkdir = f2fs_mkdir,
	498	.rmdir = f2fs_rmdir,
	499	.mknod = f2fs_mknod,
	500	.rename = f2fs_rename,
2d4d9fb5	501	.getattr = f2fs_getattr,
57397d86 JK	502	.setattr = f2fs_setattr,
57397d86 JK	503	.get_acl = f2fs_get_acl,
a6dda0e6	504	.set_acl = f2fs_set_acl,
57397d86 JK	505	#ifdef CONFIG_F2FS_FS_XATTR
	506	.setxattr = generic_setxattr,
	507	.getxattr = generic_getxattr,
	508	.listxattr = f2fs_listxattr,
	509	.removexattr = generic_removexattr,
	510	#endif
	511	};
	512
	513	const struct inode_operations f2fs_symlink_inode_operations = {
	514	.readlink = generic_readlink,
	515	.follow_link = page_follow_link_light,
	516	.put_link = page_put_link,
2d4d9fb5	517	.getattr = f2fs_getattr,
57397d86 JK	518	.setattr = f2fs_setattr,
	519	#ifdef CONFIG_F2FS_FS_XATTR
	520	.setxattr = generic_setxattr,
	521	.getxattr = generic_getxattr,
	522	.listxattr = f2fs_listxattr,
	523	.removexattr = generic_removexattr,
	524	#endif
	525	};
	526
	527	const struct inode_operations f2fs_special_inode_operations = {
2d4d9fb5	528	.getattr = f2fs_getattr,
57397d86 JK	529	.setattr = f2fs_setattr,
57397d86 JK	530	.get_acl = f2fs_get_acl,
a6dda0e6	531	.set_acl = f2fs_set_acl,
57397d86 JK	532	#ifdef CONFIG_F2FS_FS_XATTR
	533	.setxattr = generic_setxattr,
	534	.getxattr = generic_getxattr,
	535	.listxattr = f2fs_listxattr,
	536	.removexattr = generic_removexattr,
	537	#endif
	538	};