[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, ilock;

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

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

	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, ilock;

	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;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	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, ilock;

	f2fs_balance_fs(sbi);

	inode->i_ctime = CURRENT_TIME;
	atomic_inc(&inode->i_count);

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	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;
	int ilock;

	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;
	}

	ilock = mutex_lock_op(sbi);
	f2fs_delete_entry(de, page, inode);
	mutex_unlock_op(sbi, ilock);

	/* 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, ilock;

	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;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	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, ilock;

	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);
	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	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;
	int ilock;

	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;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	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, ilock = -1;

	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;
	}

	ilock = mutex_lock_op(sbi);

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

	mutex_unlock_op(sbi, ilock);
	return 0;

out_dir:
	if (old_dir_entry) {
		kunmap(old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
	mutex_unlock_op(sbi, ilock);
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;
39936837	29	int err, ilock;
57397d86 JK	30
	31	inode = new_inode(sb);
	32	if (!inode)
	33	return ERR_PTR(-ENOMEM);
	34
39936837	35	ilock = mutex_lock_op(sbi);
57397d86	36	if (!alloc_nid(sbi, &ino)) {
39936837	37	mutex_unlock_op(sbi, ilock);
57397d86 JK	38	err = -ENOSPC;
	39	goto fail;
	40	}
39936837	41	mutex_unlock_op(sbi, ilock);
57397d86 JK	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;
39936837	125	int err, ilock;
57397d86	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
39936837	141	ilock = mutex_lock_op(sbi);
57397d86	142	err = f2fs_add_link(dentry, inode);
39936837	143	mutex_unlock_op(sbi, ilock);
57397d86 JK	144	if (err)
	145	goto out;
	146
	147	alloc_nid_done(sbi, ino);
	148
	149	if (!sbi->por_doing)
	150	d_instantiate(dentry, inode);
	151	unlock_new_inode(inode);
57397d86 JK	152	return 0;
	153	out:
	154	clear_nlink(inode);
	155	unlock_new_inode(inode);
	156	iput(inode);
	157	alloc_nid_failed(sbi, ino);
	158	return err;
	159	}
	160
	161	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	162	struct dentry *dentry)
	163	{
	164	struct inode *inode = old_dentry->d_inode;
	165	struct super_block *sb = dir->i_sb;
	166	struct f2fs_sb_info *sbi = F2FS_SB(sb);
39936837	167	int err, ilock;
57397d86	168
1efef832 JK	169	f2fs_balance_fs(sbi);
1efef832 JK	170
57397d86 JK	171	inode->i_ctime = CURRENT_TIME;
	172	atomic_inc(&inode->i_count);
	173
	174	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	175	ilock = mutex_lock_op(sbi);
57397d86	176	err = f2fs_add_link(dentry, inode);
39936837	177	mutex_unlock_op(sbi, ilock);
57397d86 JK	178	if (err)
	179	goto out;
	180
953a3e27 JK	181	/*
	182	* This file should be checkpointed during fsync.
	183	* We lost i_pino from now on.
	184	*/
	185	set_cp_file(inode);
	186
57397d86	187	d_instantiate(dentry, inode);
57397d86 JK	188	return 0;
	189	out:
	190	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	191	iput(inode);
	192	return err;
	193	}
	194
	195	struct dentry f2fs_get_parent(struct dentry child)
	196	{
	197	struct qstr dotdot = QSTR_INIT("..", 2);
	198	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	199	if (!ino)
	200	return ERR_PTR(-ENOENT);
	201	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	202	}
	203
	204	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	205	unsigned int flags)
	206	{
	207	struct inode *inode = NULL;
	208	struct f2fs_dir_entry *de;
	209	struct page *page;
	210
5a20d339	211	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	212	return ERR_PTR(-ENAMETOOLONG);
	213
	214	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	215	if (de) {
	216	nid_t ino = le32_to_cpu(de->ino);
	217	kunmap(page);
	218	f2fs_put_page(page, 0);
	219
	220	inode = f2fs_iget(dir->i_sb, ino);
	221	if (IS_ERR(inode))
	222	return ERR_CAST(inode);
	223	}
	224
	225	return d_splice_alias(inode, dentry);
	226	}
	227
	228	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	229	{
	230	struct super_block *sb = dir->i_sb;
	231	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	232	struct inode *inode = dentry->d_inode;
	233	struct f2fs_dir_entry *de;
	234	struct page *page;
	235	int err = -ENOENT;
39936837	236	int ilock;
57397d86	237
1efef832 JK	238	f2fs_balance_fs(sbi);
1efef832 JK	239
57397d86 JK	240	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	241	if (!de)
	242	goto fail;
	243
	244	err = check_orphan_space(sbi);
	245	if (err) {
	246	kunmap(page);
	247	f2fs_put_page(page, 0);
	248	goto fail;
	249	}
	250
39936837	251	ilock = mutex_lock_op(sbi);
57397d86	252	f2fs_delete_entry(de, page, inode);
39936837	253	mutex_unlock_op(sbi, ilock);
57397d86 JK	254
	255	/* In order to evict this inode, we set it dirty */
	256	mark_inode_dirty(inode);
57397d86 JK	257	fail:
	258	return err;
	259	}
	260
	261	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	262	const char *symname)
	263	{
	264	struct super_block *sb = dir->i_sb;
	265	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	266	struct inode *inode;
9836b8b9	267	size_t symlen = strlen(symname) + 1;
39936837	268	int err, ilock;
57397d86	269
1efef832 JK	270	f2fs_balance_fs(sbi);
1efef832 JK	271
57397d86 JK	272	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	273	if (IS_ERR(inode))
	274	return PTR_ERR(inode);
	275
	276	inode->i_op = &f2fs_symlink_inode_operations;
	277	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	278
39936837	279	ilock = mutex_lock_op(sbi);
57397d86	280	err = f2fs_add_link(dentry, inode);
39936837	281	mutex_unlock_op(sbi, ilock);
57397d86 JK	282	if (err)
	283	goto out;
	284
	285	err = page_symlink(inode, symname, symlen);
	286	alloc_nid_done(sbi, inode->i_ino);
	287
	288	d_instantiate(dentry, inode);
	289	unlock_new_inode(inode);
57397d86 JK	290	return err;
	291	out:
	292	clear_nlink(inode);
	293	unlock_new_inode(inode);
	294	iput(inode);
	295	alloc_nid_failed(sbi, inode->i_ino);
	296	return err;
	297	}
	298
	299	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	300	{
	301	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	302	struct inode *inode;
39936837	303	int err, ilock;
57397d86	304
1efef832 JK	305	f2fs_balance_fs(sbi);
1efef832 JK	306
57397d86	307	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	308	if (IS_ERR(inode))
61412b64	309	return PTR_ERR(inode);
57397d86 JK	310
	311	inode->i_op = &f2fs_dir_inode_operations;
	312	inode->i_fop = &f2fs_dir_operations;
	313	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	314	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	315
57397d86 JK	316	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	317	ilock = mutex_lock_op(sbi);
57397d86	318	err = f2fs_add_link(dentry, inode);
39936837	319	mutex_unlock_op(sbi, ilock);
57397d86 JK	320	if (err)
	321	goto out_fail;
	322
	323	alloc_nid_done(sbi, inode->i_ino);
	324
	325	d_instantiate(dentry, inode);
	326	unlock_new_inode(inode);
	327
57397d86 JK	328	return 0;
	329
	330	out_fail:
	331	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	332	clear_nlink(inode);
	333	unlock_new_inode(inode);
	334	iput(inode);
	335	alloc_nid_failed(sbi, inode->i_ino);
	336	return err;
	337	}
	338
	339	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	340	{
	341	struct inode *inode = dentry->d_inode;
	342	if (f2fs_empty_dir(inode))
	343	return f2fs_unlink(dir, dentry);
	344	return -ENOTEMPTY;
	345	}
	346
	347	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	348	umode_t mode, dev_t rdev)
	349	{
	350	struct super_block *sb = dir->i_sb;
	351	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	352	struct inode *inode;
	353	int err = 0;
39936837	354	int ilock;
57397d86 JK	355
	356	if (!new_valid_dev(rdev))
	357	return -EINVAL;
	358
1efef832 JK	359	f2fs_balance_fs(sbi);
1efef832 JK	360
57397d86 JK	361	inode = f2fs_new_inode(dir, mode);
	362	if (IS_ERR(inode))
	363	return PTR_ERR(inode);
	364
	365	init_special_inode(inode, inode->i_mode, rdev);
	366	inode->i_op = &f2fs_special_inode_operations;
	367
39936837	368	ilock = mutex_lock_op(sbi);
57397d86	369	err = f2fs_add_link(dentry, inode);
39936837	370	mutex_unlock_op(sbi, ilock);
57397d86 JK	371	if (err)
	372	goto out;
	373
	374	alloc_nid_done(sbi, inode->i_ino);
	375	d_instantiate(dentry, inode);
	376	unlock_new_inode(inode);
57397d86 JK	377	return 0;
	378	out:
	379	clear_nlink(inode);
	380	unlock_new_inode(inode);
	381	iput(inode);
	382	alloc_nid_failed(sbi, inode->i_ino);
	383	return err;
	384	}
	385
	386	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	387	struct inode new_dir, struct dentry new_dentry)
	388	{
	389	struct super_block *sb = old_dir->i_sb;
	390	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	391	struct inode *old_inode = old_dentry->d_inode;
	392	struct inode *new_inode = new_dentry->d_inode;
	393	struct page *old_dir_page;
	394	struct page *old_page;
	395	struct f2fs_dir_entry *old_dir_entry = NULL;
	396	struct f2fs_dir_entry *old_entry;
	397	struct f2fs_dir_entry *new_entry;
39936837	398	int err = -ENOENT, ilock = -1;
57397d86	399
1efef832 JK	400	f2fs_balance_fs(sbi);
1efef832 JK	401
57397d86 JK	402	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	403	if (!old_entry)
	404	goto out;
	405
	406	if (S_ISDIR(old_inode->i_mode)) {
	407	err = -EIO;
	408	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	409	if (!old_dir_entry)
	410	goto out_old;
	411	}
	412
39936837	413	ilock = mutex_lock_op(sbi);
57397d86 JK	414
	415	if (new_inode) {
	416	struct page *new_page;
	417
	418	err = -ENOTEMPTY;
	419	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	420	goto out_dir;
	421
	422	err = -ENOENT;
	423	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	424	&new_page);
	425	if (!new_entry)
	426	goto out_dir;
	427
	428	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	429
	430	new_inode->i_ctime = CURRENT_TIME;
	431	if (old_dir_entry)
	432	drop_nlink(new_inode);
	433	drop_nlink(new_inode);
	434	if (!new_inode->i_nlink)
	435	add_orphan_inode(sbi, new_inode->i_ino);
39936837	436	update_inode_page(new_inode);
57397d86 JK	437	} else {
	438	err = f2fs_add_link(new_dentry, old_inode);
	439	if (err)
	440	goto out_dir;
	441
	442	if (old_dir_entry) {
	443	inc_nlink(new_dir);
39936837	444	update_inode_page(new_dir);
57397d86 JK	445	}
	446	}
	447
	448	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	449	mark_inode_dirty(old_inode);
	450
	451	f2fs_delete_entry(old_entry, old_page, NULL);
	452
	453	if (old_dir_entry) {
	454	if (old_dir != new_dir) {
	455	f2fs_set_link(old_inode, old_dir_entry,
	456	old_dir_page, new_dir);
	457	} else {
	458	kunmap(old_dir_page);
	459	f2fs_put_page(old_dir_page, 0);
	460	}
	461	drop_nlink(old_dir);
39936837	462	update_inode_page(old_dir);
57397d86 JK	463	}
57397d86 JK	464
39936837	465	mutex_unlock_op(sbi, ilock);
57397d86 JK	466	return 0;
	467
	468	out_dir:
	469	if (old_dir_entry) {
	470	kunmap(old_dir_page);
	471	f2fs_put_page(old_dir_page, 0);
	472	}
39936837	473	mutex_unlock_op(sbi, ilock);
57397d86 JK	474	out_old:
	475	kunmap(old_page);
	476	f2fs_put_page(old_page, 0);
	477	out:
	478	return err;
	479	}
	480
	481	const struct inode_operations f2fs_dir_inode_operations = {
	482	.create = f2fs_create,
	483	.lookup = f2fs_lookup,
	484	.link = f2fs_link,
	485	.unlink = f2fs_unlink,
	486	.symlink = f2fs_symlink,
	487	.mkdir = f2fs_mkdir,
	488	.rmdir = f2fs_rmdir,
	489	.mknod = f2fs_mknod,
	490	.rename = f2fs_rename,
	491	.setattr = f2fs_setattr,
	492	.get_acl = f2fs_get_acl,
	493	#ifdef CONFIG_F2FS_FS_XATTR
	494	.setxattr = generic_setxattr,
	495	.getxattr = generic_getxattr,
	496	.listxattr = f2fs_listxattr,
	497	.removexattr = generic_removexattr,
	498	#endif
	499	};
	500
	501	const struct inode_operations f2fs_symlink_inode_operations = {
	502	.readlink = generic_readlink,
	503	.follow_link = page_follow_link_light,
	504	.put_link = page_put_link,
	505	.setattr = f2fs_setattr,
	506	#ifdef CONFIG_F2FS_FS_XATTR
	507	.setxattr = generic_setxattr,
	508	.getxattr = generic_getxattr,
	509	.listxattr = f2fs_listxattr,
	510	.removexattr = generic_removexattr,
	511	#endif
	512	};
	513
	514	const struct inode_operations f2fs_special_inode_operations = {
	515	.setattr = f2fs_setattr,
	516	.get_acl = f2fs_get_acl,
	517	#ifdef CONFIG_F2FS_FS_XATTR
	518	.setxattr = generic_setxattr,
	519	.getxattr = generic_getxattr,
	520	.listxattr = f2fs_listxattr,
	521	.removexattr = generic_removexattr,
	522	#endif
	523	};