[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"
#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, 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 0;

	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;

	trace_f2fs_unlink_enter(dir, dentry);
	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:
	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, 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"
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;
39936837	30	int err, ilock;
57397d86 JK	31
	32	inode = new_inode(sb);
	33	if (!inode)
	34	return ERR_PTR(-ENOMEM);
	35
39936837	36	ilock = mutex_lock_op(sbi);
57397d86	37	if (!alloc_nid(sbi, &ino)) {
39936837	38	mutex_unlock_op(sbi, ilock);
57397d86 JK	39	err = -ENOSPC;
	40	goto fail;
	41	}
39936837	42	mutex_unlock_op(sbi, ilock);
57397d86 JK	43
	44	inode->i_uid = current_fsuid();
	45
	46	if (dir->i_mode & S_ISGID) {
	47	inode->i_gid = dir->i_gid;
	48	if (S_ISDIR(mode))
	49	mode \|= S_ISGID;
	50	} else {
	51	inode->i_gid = current_fsgid();
	52	}
	53
	54	inode->i_ino = ino;
	55	inode->i_mode = mode;
	56	inode->i_blocks = 0;
	57	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	58	inode->i_generation = sbi->s_next_generation++;
	59
	60	err = insert_inode_locked(inode);
	61	if (err) {
	62	err = -EINVAL;
	63	nid_free = true;
	64	goto out;
	65	}
	66
	67	mark_inode_dirty(inode);
	68	return inode;
	69
	70	out:
	71	clear_nlink(inode);
	72	unlock_new_inode(inode);
	73	fail:
	74	iput(inode);
	75	if (nid_free)
	76	alloc_nid_failed(sbi, ino);
	77	return ERR_PTR(err);
	78	}
	79
	80	static int is_multimedia_file(const unsigned char s, const char sub)
	81	{
9836b8b9 LR	82	size_t slen = strlen(s);
9836b8b9 LR	83	size_t sublen = strlen(sub);
57397d86 JK	84	int ret;
	85
	86	if (sublen > slen)
e66509f0	87	return 0;
57397d86 JK	88
	89	ret = memcmp(s + slen - sublen, sub, sublen);
	90	if (ret) { /* compare upper case */
	91	int i;
	92	char upper_sub[8];
	93	for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
	94	upper_sub[i] = toupper(sub[i]);
e66509f0	95	return !memcmp(s + slen - sublen, upper_sub, sublen);
57397d86 JK	96	}
57397d86 JK	97
e66509f0	98	return !ret;
57397d86 JK	99	}
57397d86 JK	100
0a8165d7	101	/*
57397d86 JK	102	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	103	*/
953a3e27	104	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	105	const unsigned char *name)
	106	{
	107	int i;
	108	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	109
	110	int count = le32_to_cpu(sbi->raw_super->extension_count);
	111	for (i = 0; i < count; i++) {
e66509f0	112	if (is_multimedia_file(name, extlist[i])) {
953a3e27	113	set_cold_file(inode);
57397d86 JK	114	break;
	115	}
	116	}
	117	}
	118
	119	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	120	bool excl)
	121	{
	122	struct super_block *sb = dir->i_sb;
	123	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	124	struct inode *inode;
	125	nid_t ino = 0;
39936837	126	int err, ilock;
57397d86	127
1efef832 JK	128	f2fs_balance_fs(sbi);
1efef832 JK	129
57397d86 JK	130	inode = f2fs_new_inode(dir, mode);
	131	if (IS_ERR(inode))
	132	return PTR_ERR(inode);
	133
	134	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	135	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	136
	137	inode->i_op = &f2fs_file_inode_operations;
	138	inode->i_fop = &f2fs_file_operations;
	139	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	140	ino = inode->i_ino;
	141
39936837	142	ilock = mutex_lock_op(sbi);
57397d86	143	err = f2fs_add_link(dentry, inode);
39936837	144	mutex_unlock_op(sbi, ilock);
57397d86 JK	145	if (err)
	146	goto out;
	147
	148	alloc_nid_done(sbi, ino);
	149
	150	if (!sbi->por_doing)
	151	d_instantiate(dentry, inode);
	152	unlock_new_inode(inode);
57397d86 JK	153	return 0;
	154	out:
	155	clear_nlink(inode);
	156	unlock_new_inode(inode);
	157	iput(inode);
	158	alloc_nid_failed(sbi, ino);
	159	return err;
	160	}
	161
	162	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	163	struct dentry *dentry)
	164	{
	165	struct inode *inode = old_dentry->d_inode;
	166	struct super_block *sb = dir->i_sb;
	167	struct f2fs_sb_info *sbi = F2FS_SB(sb);
39936837	168	int err, ilock;
57397d86	169
1efef832 JK	170	f2fs_balance_fs(sbi);
1efef832 JK	171
57397d86 JK	172	inode->i_ctime = CURRENT_TIME;
	173	atomic_inc(&inode->i_count);
	174
	175	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	176	ilock = mutex_lock_op(sbi);
57397d86	177	err = f2fs_add_link(dentry, inode);
39936837	178	mutex_unlock_op(sbi, ilock);
57397d86 JK	179	if (err)
	180	goto out;
	181
953a3e27 JK	182	/*
	183	* This file should be checkpointed during fsync.
	184	* We lost i_pino from now on.
	185	*/
	186	set_cp_file(inode);
	187
57397d86	188	d_instantiate(dentry, inode);
57397d86 JK	189	return 0;
	190	out:
	191	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	192	iput(inode);
	193	return err;
	194	}
	195
	196	struct dentry f2fs_get_parent(struct dentry child)
	197	{
	198	struct qstr dotdot = QSTR_INIT("..", 2);
	199	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	200	if (!ino)
	201	return ERR_PTR(-ENOENT);
	202	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	203	}
	204
	205	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	206	unsigned int flags)
	207	{
	208	struct inode *inode = NULL;
	209	struct f2fs_dir_entry *de;
	210	struct page *page;
	211
5a20d339	212	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	213	return ERR_PTR(-ENAMETOOLONG);
	214
	215	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	216	if (de) {
	217	nid_t ino = le32_to_cpu(de->ino);
	218	kunmap(page);
	219	f2fs_put_page(page, 0);
	220
	221	inode = f2fs_iget(dir->i_sb, ino);
	222	if (IS_ERR(inode))
	223	return ERR_CAST(inode);
	224	}
	225
	226	return d_splice_alias(inode, dentry);
	227	}
	228
	229	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	230	{
	231	struct super_block *sb = dir->i_sb;
	232	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	233	struct inode *inode = dentry->d_inode;
	234	struct f2fs_dir_entry *de;
	235	struct page *page;
	236	int err = -ENOENT;
39936837	237	int ilock;
57397d86	238
a2a4a7e4	239	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	240	f2fs_balance_fs(sbi);
1efef832 JK	241
57397d86 JK	242	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	243	if (!de)
	244	goto fail;
	245
	246	err = check_orphan_space(sbi);
	247	if (err) {
	248	kunmap(page);
	249	f2fs_put_page(page, 0);
	250	goto fail;
	251	}
	252
39936837	253	ilock = mutex_lock_op(sbi);
57397d86	254	f2fs_delete_entry(de, page, inode);
39936837	255	mutex_unlock_op(sbi, ilock);
57397d86 JK	256
	257	/* In order to evict this inode, we set it dirty */
	258	mark_inode_dirty(inode);
57397d86	259	fail:
a2a4a7e4	260	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	261	return err;
	262	}
	263
	264	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	265	const char *symname)
	266	{
	267	struct super_block *sb = dir->i_sb;
	268	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	269	struct inode *inode;
9836b8b9	270	size_t symlen = strlen(symname) + 1;
39936837	271	int err, ilock;
57397d86	272
1efef832 JK	273	f2fs_balance_fs(sbi);
1efef832 JK	274
57397d86 JK	275	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	276	if (IS_ERR(inode))
	277	return PTR_ERR(inode);
	278
	279	inode->i_op = &f2fs_symlink_inode_operations;
	280	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	281
39936837	282	ilock = mutex_lock_op(sbi);
57397d86	283	err = f2fs_add_link(dentry, inode);
39936837	284	mutex_unlock_op(sbi, ilock);
57397d86 JK	285	if (err)
	286	goto out;
	287
	288	err = page_symlink(inode, symname, symlen);
	289	alloc_nid_done(sbi, inode->i_ino);
	290
	291	d_instantiate(dentry, inode);
	292	unlock_new_inode(inode);
57397d86 JK	293	return err;
	294	out:
	295	clear_nlink(inode);
	296	unlock_new_inode(inode);
	297	iput(inode);
	298	alloc_nid_failed(sbi, inode->i_ino);
	299	return err;
	300	}
	301
	302	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	303	{
	304	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	305	struct inode *inode;
39936837	306	int err, ilock;
57397d86	307
1efef832 JK	308	f2fs_balance_fs(sbi);
1efef832 JK	309
57397d86	310	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	311	if (IS_ERR(inode))
61412b64	312	return PTR_ERR(inode);
57397d86 JK	313
	314	inode->i_op = &f2fs_dir_inode_operations;
	315	inode->i_fop = &f2fs_dir_operations;
	316	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	317	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	318
57397d86 JK	319	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	320	ilock = mutex_lock_op(sbi);
57397d86	321	err = f2fs_add_link(dentry, inode);
39936837	322	mutex_unlock_op(sbi, ilock);
57397d86 JK	323	if (err)
	324	goto out_fail;
	325
	326	alloc_nid_done(sbi, inode->i_ino);
	327
	328	d_instantiate(dentry, inode);
	329	unlock_new_inode(inode);
	330
57397d86 JK	331	return 0;
	332
	333	out_fail:
	334	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	335	clear_nlink(inode);
	336	unlock_new_inode(inode);
	337	iput(inode);
	338	alloc_nid_failed(sbi, inode->i_ino);
	339	return err;
	340	}
	341
	342	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	343	{
	344	struct inode *inode = dentry->d_inode;
	345	if (f2fs_empty_dir(inode))
	346	return f2fs_unlink(dir, dentry);
	347	return -ENOTEMPTY;
	348	}
	349
	350	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	351	umode_t mode, dev_t rdev)
	352	{
	353	struct super_block *sb = dir->i_sb;
	354	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	355	struct inode *inode;
	356	int err = 0;
39936837	357	int ilock;
57397d86 JK	358
	359	if (!new_valid_dev(rdev))
	360	return -EINVAL;
	361
1efef832 JK	362	f2fs_balance_fs(sbi);
1efef832 JK	363
57397d86 JK	364	inode = f2fs_new_inode(dir, mode);
	365	if (IS_ERR(inode))
	366	return PTR_ERR(inode);
	367
	368	init_special_inode(inode, inode->i_mode, rdev);
	369	inode->i_op = &f2fs_special_inode_operations;
	370
39936837	371	ilock = mutex_lock_op(sbi);
57397d86	372	err = f2fs_add_link(dentry, inode);
39936837	373	mutex_unlock_op(sbi, ilock);
57397d86 JK	374	if (err)
	375	goto out;
	376
	377	alloc_nid_done(sbi, inode->i_ino);
	378	d_instantiate(dentry, inode);
	379	unlock_new_inode(inode);
57397d86 JK	380	return 0;
	381	out:
	382	clear_nlink(inode);
	383	unlock_new_inode(inode);
	384	iput(inode);
	385	alloc_nid_failed(sbi, inode->i_ino);
	386	return err;
	387	}
	388
	389	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	390	struct inode new_dir, struct dentry new_dentry)
	391	{
	392	struct super_block *sb = old_dir->i_sb;
	393	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	394	struct inode *old_inode = old_dentry->d_inode;
	395	struct inode *new_inode = new_dentry->d_inode;
	396	struct page *old_dir_page;
	397	struct page *old_page;
	398	struct f2fs_dir_entry *old_dir_entry = NULL;
	399	struct f2fs_dir_entry *old_entry;
	400	struct f2fs_dir_entry *new_entry;
39936837	401	int err = -ENOENT, ilock = -1;
57397d86	402
1efef832 JK	403	f2fs_balance_fs(sbi);
1efef832 JK	404
57397d86 JK	405	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	406	if (!old_entry)
	407	goto out;
	408
	409	if (S_ISDIR(old_inode->i_mode)) {
	410	err = -EIO;
	411	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	412	if (!old_dir_entry)
	413	goto out_old;
	414	}
	415
39936837	416	ilock = mutex_lock_op(sbi);
57397d86 JK	417
	418	if (new_inode) {
	419	struct page *new_page;
	420
	421	err = -ENOTEMPTY;
	422	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	423	goto out_dir;
	424
	425	err = -ENOENT;
	426	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	427	&new_page);
	428	if (!new_entry)
	429	goto out_dir;
	430
	431	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	432
	433	new_inode->i_ctime = CURRENT_TIME;
	434	if (old_dir_entry)
	435	drop_nlink(new_inode);
	436	drop_nlink(new_inode);
	437	if (!new_inode->i_nlink)
	438	add_orphan_inode(sbi, new_inode->i_ino);
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);
	460	} else {
	461	kunmap(old_dir_page);
	462	f2fs_put_page(old_dir_page, 0);
	463	}
	464	drop_nlink(old_dir);
39936837	465	update_inode_page(old_dir);
57397d86 JK	466	}
57397d86 JK	467
39936837	468	mutex_unlock_op(sbi, ilock);
57397d86 JK	469	return 0;
	470
	471	out_dir:
	472	if (old_dir_entry) {
	473	kunmap(old_dir_page);
	474	f2fs_put_page(old_dir_page, 0);
	475	}
39936837	476	mutex_unlock_op(sbi, ilock);
57397d86 JK	477	out_old:
	478	kunmap(old_page);
	479	f2fs_put_page(old_page, 0);
	480	out:
	481	return err;
	482	}
	483
	484	const struct inode_operations f2fs_dir_inode_operations = {
	485	.create = f2fs_create,
	486	.lookup = f2fs_lookup,
	487	.link = f2fs_link,
	488	.unlink = f2fs_unlink,
	489	.symlink = f2fs_symlink,
	490	.mkdir = f2fs_mkdir,
	491	.rmdir = f2fs_rmdir,
	492	.mknod = f2fs_mknod,
	493	.rename = f2fs_rename,
	494	.setattr = f2fs_setattr,
	495	.get_acl = f2fs_get_acl,
	496	#ifdef CONFIG_F2FS_FS_XATTR
	497	.setxattr = generic_setxattr,
	498	.getxattr = generic_getxattr,
	499	.listxattr = f2fs_listxattr,
	500	.removexattr = generic_removexattr,
	501	#endif
	502	};
	503
	504	const struct inode_operations f2fs_symlink_inode_operations = {
	505	.readlink = generic_readlink,
	506	.follow_link = page_follow_link_light,
	507	.put_link = page_put_link,
	508	.setattr = f2fs_setattr,
	509	#ifdef CONFIG_F2FS_FS_XATTR
	510	.setxattr = generic_setxattr,
	511	.getxattr = generic_getxattr,
	512	.listxattr = f2fs_listxattr,
	513	.removexattr = generic_removexattr,
	514	#endif
	515	};
	516
	517	const struct inode_operations f2fs_special_inode_operations = {
	518	.setattr = f2fs_setattr,
	519	.get_acl = f2fs_get_acl,
	520	#ifdef CONFIG_F2FS_FS_XATTR
	521	.setxattr = generic_setxattr,
	522	.getxattr = generic_getxattr,
	523	.listxattr = f2fs_listxattr,
	524	.removexattr = generic_removexattr,
	525	#endif
	526	};