[GitHub/exynos8895/android_kernel_samsung_universal8895.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"

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);

	mutex_lock_op(sbi, NODE_NEW);
	if (!alloc_nid(sbi, &ino)) {
		mutex_unlock_op(sbi, NODE_NEW);
		err = -ENOSPC;
		goto fail;
	}
	mutex_unlock_op(sbi, NODE_NEW);

	inode->i_uid = current_fsuid();

	if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else {
		inode->i_gid = current_fsgid();
	}

	inode->i_ino = ino;
	inode->i_mode = mode;
	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;
	}

	mark_inode_dirty(inode);
	return inode;

out:
	clear_nlink(inode);
	unlock_new_inode(inode);
fail:
	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);
	int ret;

	if (sublen > slen)
		return 1;

	ret = memcmp(s + slen - sublen, sub, sublen);
	if (ret) {	/* compare upper case */
		int i;
		char upper_sub[8];
		for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
			upper_sub[i] = toupper(sub[i]);
		return memcmp(s + slen - sublen, upper_sub, sublen);
	}

	return ret;
}

/*
 * 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])) {
			set_cold_file(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;

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

	alloc_nid_done(sbi, ino);

	if (!sbi->por_doing)
		d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_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;
	atomic_inc(&inode->i_count);

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

	/*
	 * This file should be checkpointed during fsync.
	 * We lost i_pino from now on.
	 */
	set_cp_file(inode);

	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);
	}

	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;

	f2fs_balance_fs(sbi);

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

	err = check_orphan_space(sbi);
	if (err) {
		kunmap(page);
		f2fs_put_page(page, 0);
		goto fail;
	}

	f2fs_delete_entry(de, page, inode);

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

	err = f2fs_add_link(dentry, inode);
	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);
	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);
	err = f2fs_add_link(dentry, inode);
	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);
	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;

	err = f2fs_add_link(dentry, inode);
	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);
	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;
	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;
	}

	mutex_lock_op(sbi, RENAME);

	if (new_inode) {
		struct page *new_page;

		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;

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		f2fs_write_inode(new_inode, NULL);
	} else {
		err = f2fs_add_link(new_dentry, old_inode);
		if (err)
			goto out_dir;

		if (old_dir_entry) {
			inc_nlink(new_dir);
			f2fs_write_inode(new_dir, NULL);
		}
	}

	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);
		} else {
			kunmap(old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
		f2fs_write_inode(old_dir, NULL);
	}

	mutex_unlock_op(sbi, RENAME);
	return 0;

out_dir:
	if (old_dir_entry) {
		kunmap(old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
	mutex_unlock_op(sbi, RENAME);
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,
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_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,
	.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 = {
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_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"
	20	#include "acl.h"
	21
	22	static struct inode f2fs_new_inode(struct inode dir, umode_t mode)
	23	{
	24	struct super_block *sb = dir->i_sb;
	25	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	26	nid_t ino;
	27	struct inode *inode;
	28	bool nid_free = false;
	29	int err;
	30
	31	inode = new_inode(sb);
	32	if (!inode)
	33	return ERR_PTR(-ENOMEM);
	34
	35	mutex_lock_op(sbi, NODE_NEW);
	36	if (!alloc_nid(sbi, &ino)) {
	37	mutex_unlock_op(sbi, NODE_NEW);
	38	err = -ENOSPC;
	39	goto fail;
	40	}
	41	mutex_unlock_op(sbi, NODE_NEW);
	42
	43	inode->i_uid = current_fsuid();
	44
	45	if (dir->i_mode & S_ISGID) {
	46	inode->i_gid = dir->i_gid;
	47	if (S_ISDIR(mode))
	48	mode \|= S_ISGID;
	49	} else {
	50	inode->i_gid = current_fsgid();
	51	}
	52
	53	inode->i_ino = ino;
	54	inode->i_mode = mode;
	55	inode->i_blocks = 0;
	56	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	57	inode->i_generation = sbi->s_next_generation++;
	58
	59	err = insert_inode_locked(inode);
	60	if (err) {
	61	err = -EINVAL;
	62	nid_free = true;
	63	goto out;
	64	}
	65
	66	mark_inode_dirty(inode);
	67	return inode;
	68
	69	out:
	70	clear_nlink(inode);
	71	unlock_new_inode(inode);
	72	fail:
	73	iput(inode);
	74	if (nid_free)
	75	alloc_nid_failed(sbi, ino);
	76	return ERR_PTR(err);
	77	}
	78
	79	static int is_multimedia_file(const unsigned char s, const char sub)
	80	{
9836b8b9 LR	81	size_t slen = strlen(s);
9836b8b9 LR	82	size_t sublen = strlen(sub);
57397d86 JK	83	int ret;
	84
	85	if (sublen > slen)
	86	return 1;
	87
	88	ret = memcmp(s + slen - sublen, sub, sublen);
	89	if (ret) { /* compare upper case */
	90	int i;
	91	char upper_sub[8];
	92	for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
	93	upper_sub[i] = toupper(sub[i]);
	94	return memcmp(s + slen - sublen, upper_sub, sublen);
	95	}
	96
	97	return ret;
	98	}
	99
0a8165d7	100	/*
57397d86 JK	101	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	102	*/
953a3e27	103	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	104	const unsigned char *name)
	105	{
	106	int i;
	107	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	108
	109	int count = le32_to_cpu(sbi->raw_super->extension_count);
	110	for (i = 0; i < count; i++) {
	111	if (!is_multimedia_file(name, extlist[i])) {
953a3e27	112	set_cold_file(inode);
57397d86 JK	113	break;
	114	}
	115	}
	116	}
	117
	118	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	119	bool excl)
	120	{
	121	struct super_block *sb = dir->i_sb;
	122	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	123	struct inode *inode;
	124	nid_t ino = 0;
	125	int err;
	126
1efef832 JK	127	f2fs_balance_fs(sbi);
1efef832 JK	128
57397d86 JK	129	inode = f2fs_new_inode(dir, mode);
	130	if (IS_ERR(inode))
	131	return PTR_ERR(inode);
	132
	133	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	134	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	135
	136	inode->i_op = &f2fs_file_inode_operations;
	137	inode->i_fop = &f2fs_file_operations;
	138	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	139	ino = inode->i_ino;
	140
	141	err = f2fs_add_link(dentry, inode);
	142	if (err)
	143	goto out;
	144
	145	alloc_nid_done(sbi, ino);
	146
	147	if (!sbi->por_doing)
	148	d_instantiate(dentry, inode);
	149	unlock_new_inode(inode);
57397d86 JK	150	return 0;
	151	out:
	152	clear_nlink(inode);
	153	unlock_new_inode(inode);
	154	iput(inode);
	155	alloc_nid_failed(sbi, ino);
	156	return err;
	157	}
	158
	159	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	160	struct dentry *dentry)
	161	{
	162	struct inode *inode = old_dentry->d_inode;
	163	struct super_block *sb = dir->i_sb;
	164	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	165	int err;
	166
1efef832 JK	167	f2fs_balance_fs(sbi);
1efef832 JK	168
57397d86 JK	169	inode->i_ctime = CURRENT_TIME;
	170	atomic_inc(&inode->i_count);
	171
	172	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	173	err = f2fs_add_link(dentry, inode);
	174	if (err)
	175	goto out;
	176
953a3e27 JK	177	/*
	178	* This file should be checkpointed during fsync.
	179	* We lost i_pino from now on.
	180	*/
	181	set_cp_file(inode);
	182
57397d86	183	d_instantiate(dentry, inode);
57397d86 JK	184	return 0;
	185	out:
	186	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	187	iput(inode);
	188	return err;
	189	}
	190
	191	struct dentry f2fs_get_parent(struct dentry child)
	192	{
	193	struct qstr dotdot = QSTR_INIT("..", 2);
	194	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	195	if (!ino)
	196	return ERR_PTR(-ENOENT);
	197	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	198	}
	199
	200	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	201	unsigned int flags)
	202	{
	203	struct inode *inode = NULL;
	204	struct f2fs_dir_entry *de;
	205	struct page *page;
	206
5a20d339	207	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	208	return ERR_PTR(-ENAMETOOLONG);
	209
	210	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	211	if (de) {
	212	nid_t ino = le32_to_cpu(de->ino);
	213	kunmap(page);
	214	f2fs_put_page(page, 0);
	215
	216	inode = f2fs_iget(dir->i_sb, ino);
	217	if (IS_ERR(inode))
	218	return ERR_CAST(inode);
	219	}
	220
	221	return d_splice_alias(inode, dentry);
	222	}
	223
	224	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	225	{
	226	struct super_block *sb = dir->i_sb;
	227	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	228	struct inode *inode = dentry->d_inode;
	229	struct f2fs_dir_entry *de;
	230	struct page *page;
	231	int err = -ENOENT;
	232
1efef832 JK	233	f2fs_balance_fs(sbi);
1efef832 JK	234
57397d86 JK	235	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	236	if (!de)
	237	goto fail;
	238
	239	err = check_orphan_space(sbi);
	240	if (err) {
	241	kunmap(page);
	242	f2fs_put_page(page, 0);
	243	goto fail;
	244	}
	245
	246	f2fs_delete_entry(de, page, inode);
	247
	248	/* In order to evict this inode, we set it dirty */
	249	mark_inode_dirty(inode);
57397d86 JK	250	fail:
	251	return err;
	252	}
	253
	254	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	255	const char *symname)
	256	{
	257	struct super_block *sb = dir->i_sb;
	258	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	259	struct inode *inode;
9836b8b9	260	size_t symlen = strlen(symname) + 1;
57397d86 JK	261	int err;
57397d86 JK	262
1efef832 JK	263	f2fs_balance_fs(sbi);
1efef832 JK	264
57397d86 JK	265	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	266	if (IS_ERR(inode))
	267	return PTR_ERR(inode);
	268
	269	inode->i_op = &f2fs_symlink_inode_operations;
	270	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	271
	272	err = f2fs_add_link(dentry, inode);
	273	if (err)
	274	goto out;
	275
	276	err = page_symlink(inode, symname, symlen);
	277	alloc_nid_done(sbi, inode->i_ino);
	278
	279	d_instantiate(dentry, inode);
	280	unlock_new_inode(inode);
57397d86 JK	281	return err;
	282	out:
	283	clear_nlink(inode);
	284	unlock_new_inode(inode);
	285	iput(inode);
	286	alloc_nid_failed(sbi, inode->i_ino);
	287	return err;
	288	}
	289
	290	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	291	{
	292	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	293	struct inode *inode;
	294	int err;
	295
1efef832 JK	296	f2fs_balance_fs(sbi);
1efef832 JK	297
57397d86	298	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	299	if (IS_ERR(inode))
61412b64	300	return PTR_ERR(inode);
57397d86 JK	301
	302	inode->i_op = &f2fs_dir_inode_operations;
	303	inode->i_fop = &f2fs_dir_operations;
	304	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	305	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	306
	307	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	308	err = f2fs_add_link(dentry, inode);
	309	if (err)
	310	goto out_fail;
	311
	312	alloc_nid_done(sbi, inode->i_ino);
	313
	314	d_instantiate(dentry, inode);
	315	unlock_new_inode(inode);
	316
57397d86 JK	317	return 0;
	318
	319	out_fail:
	320	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	321	clear_nlink(inode);
	322	unlock_new_inode(inode);
	323	iput(inode);
	324	alloc_nid_failed(sbi, inode->i_ino);
	325	return err;
	326	}
	327
	328	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	329	{
	330	struct inode *inode = dentry->d_inode;
	331	if (f2fs_empty_dir(inode))
	332	return f2fs_unlink(dir, dentry);
	333	return -ENOTEMPTY;
	334	}
	335
	336	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	337	umode_t mode, dev_t rdev)
	338	{
	339	struct super_block *sb = dir->i_sb;
	340	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	341	struct inode *inode;
	342	int err = 0;
	343
	344	if (!new_valid_dev(rdev))
	345	return -EINVAL;
	346
1efef832 JK	347	f2fs_balance_fs(sbi);
1efef832 JK	348
57397d86 JK	349	inode = f2fs_new_inode(dir, mode);
	350	if (IS_ERR(inode))
	351	return PTR_ERR(inode);
	352
	353	init_special_inode(inode, inode->i_mode, rdev);
	354	inode->i_op = &f2fs_special_inode_operations;
	355
	356	err = f2fs_add_link(dentry, inode);
	357	if (err)
	358	goto out;
	359
	360	alloc_nid_done(sbi, inode->i_ino);
	361	d_instantiate(dentry, inode);
	362	unlock_new_inode(inode);
57397d86 JK	363	return 0;
	364	out:
	365	clear_nlink(inode);
	366	unlock_new_inode(inode);
	367	iput(inode);
	368	alloc_nid_failed(sbi, inode->i_ino);
	369	return err;
	370	}
	371
	372	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	373	struct inode new_dir, struct dentry new_dentry)
	374	{
	375	struct super_block *sb = old_dir->i_sb;
	376	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	377	struct inode *old_inode = old_dentry->d_inode;
	378	struct inode *new_inode = new_dentry->d_inode;
	379	struct page *old_dir_page;
	380	struct page *old_page;
	381	struct f2fs_dir_entry *old_dir_entry = NULL;
	382	struct f2fs_dir_entry *old_entry;
	383	struct f2fs_dir_entry *new_entry;
	384	int err = -ENOENT;
	385
1efef832 JK	386	f2fs_balance_fs(sbi);
1efef832 JK	387
57397d86 JK	388	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	389	if (!old_entry)
	390	goto out;
	391
	392	if (S_ISDIR(old_inode->i_mode)) {
	393	err = -EIO;
	394	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	395	if (!old_dir_entry)
	396	goto out_old;
	397	}
	398
	399	mutex_lock_op(sbi, RENAME);
	400
	401	if (new_inode) {
	402	struct page *new_page;
	403
	404	err = -ENOTEMPTY;
	405	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	406	goto out_dir;
	407
	408	err = -ENOENT;
	409	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	410	&new_page);
	411	if (!new_entry)
	412	goto out_dir;
	413
	414	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	415
	416	new_inode->i_ctime = CURRENT_TIME;
	417	if (old_dir_entry)
	418	drop_nlink(new_inode);
	419	drop_nlink(new_inode);
	420	if (!new_inode->i_nlink)
	421	add_orphan_inode(sbi, new_inode->i_ino);
	422	f2fs_write_inode(new_inode, NULL);
	423	} else {
	424	err = f2fs_add_link(new_dentry, old_inode);
	425	if (err)
	426	goto out_dir;
	427
	428	if (old_dir_entry) {
	429	inc_nlink(new_dir);
	430	f2fs_write_inode(new_dir, NULL);
	431	}
	432	}
	433
	434	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	435	mark_inode_dirty(old_inode);
	436
	437	f2fs_delete_entry(old_entry, old_page, NULL);
	438
	439	if (old_dir_entry) {
	440	if (old_dir != new_dir) {
	441	f2fs_set_link(old_inode, old_dir_entry,
	442	old_dir_page, new_dir);
	443	} else {
	444	kunmap(old_dir_page);
	445	f2fs_put_page(old_dir_page, 0);
	446	}
	447	drop_nlink(old_dir);
	448	f2fs_write_inode(old_dir, NULL);
	449	}
	450
	451	mutex_unlock_op(sbi, RENAME);
57397d86 JK	452	return 0;
	453
	454	out_dir:
	455	if (old_dir_entry) {
	456	kunmap(old_dir_page);
	457	f2fs_put_page(old_dir_page, 0);
	458	}
	459	mutex_unlock_op(sbi, RENAME);
	460	out_old:
	461	kunmap(old_page);
	462	f2fs_put_page(old_page, 0);
	463	out:
	464	return err;
	465	}
	466
	467	const struct inode_operations f2fs_dir_inode_operations = {
	468	.create = f2fs_create,
	469	.lookup = f2fs_lookup,
	470	.link = f2fs_link,
	471	.unlink = f2fs_unlink,
	472	.symlink = f2fs_symlink,
	473	.mkdir = f2fs_mkdir,
	474	.rmdir = f2fs_rmdir,
	475	.mknod = f2fs_mknod,
	476	.rename = f2fs_rename,
	477	.setattr = f2fs_setattr,
	478	.get_acl = f2fs_get_acl,
	479	#ifdef CONFIG_F2FS_FS_XATTR
	480	.setxattr = generic_setxattr,
	481	.getxattr = generic_getxattr,
	482	.listxattr = f2fs_listxattr,
	483	.removexattr = generic_removexattr,
	484	#endif
	485	};
	486
	487	const struct inode_operations f2fs_symlink_inode_operations = {
	488	.readlink = generic_readlink,
	489	.follow_link = page_follow_link_light,
	490	.put_link = page_put_link,
	491	.setattr = f2fs_setattr,
	492	#ifdef CONFIG_F2FS_FS_XATTR
	493	.setxattr = generic_setxattr,
	494	.getxattr = generic_getxattr,
	495	.listxattr = f2fs_listxattr,
	496	.removexattr = generic_removexattr,
	497	#endif
	498	};
	499
	500	const struct inode_operations f2fs_special_inode_operations = {
	501	.setattr = f2fs_setattr,
	502	.get_acl = f2fs_get_acl,
	503	#ifdef CONFIG_F2FS_FS_XATTR
	504	.setxattr = generic_setxattr,
	505	.getxattr = generic_getxattr,
	506	.listxattr = f2fs_listxattr,
	507	.removexattr = generic_removexattr,
	508	#endif
	509	};