/**
 * ecryptfs_do_create
 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
 * @ecryptfs_dentry: New file's dentry in ecryptfs
 * @mode: The mode of the new file
 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 *
 * Creates the underlying file and the eCryptfs inode which will link to
 * it. It will also update the eCryptfs directory inode to mimic the
 * stat of the lower directory inode.
 *
 * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
 */
static struct inode *
ecryptfs_do_create(struct inode *directory_inode,
                   struct dentry *ecryptfs_dentry, umode_t mode)
{
    int rc;
    struct dentry *lower_dentry;
    struct dentry *lower_dir_dentry;
    struct inode *inode;

    lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
    lower_dir_dentry = lock_parent(lower_dentry);
    if (IS_ERR(lower_dir_dentry)) {
        ecryptfs_printk(KERN_ERR, "Error locking directory of "
                        "dentry\n");
        inode = ERR_CAST(lower_dir_dentry);
        goto out;
    }
    rc = vfs_create(lower_dir_dentry->d_inode, lower_dentry, mode, true);
    if (rc) {
        printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
               "rc = [%d]\n", __func__, rc);
        inode = ERR_PTR(rc);
        goto out_lock;
    }
    inode = __ecryptfs_get_inode(lower_dentry->d_inode,
                                 directory_inode->i_sb);
    if (IS_ERR(inode)) {
        vfs_unlink(lower_dir_dentry->d_inode, lower_dentry, NULL);
        goto out_lock;
    }
    fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
    fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
out_lock:
    unlock_dir(lower_dir_dentry);
out:
    return inode;
}

static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
{
	int rc = 0;
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
	struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
	struct dentry *lower_dir_dentry;

	dget(lower_dentry);
	lower_dir_dentry = lock_parent(lower_dentry);
	rc = vfs_unlink(lower_dir_inode, lower_dentry);
	if (rc) {
		printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
		goto out_unlock;
	}
	fsstack_copy_attr_times(dir, lower_dir_inode);
	set_nlink(dentry->d_inode,
		  ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink);
	dentry->d_inode->i_ctime = dir->i_ctime;
	d_drop(dentry);
out_unlock:
	unlock_dir(lower_dir_dentry);
	dput(lower_dentry);
	return rc;
}

static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct dentry *lower_dentry;
	struct dentry *lower_dir_dentry;
	int rc;

	dentry_unhash(dentry);

	lower_dentry = ecryptfs_dentry_to_lower(dentry);
	dget(dentry);
	lower_dir_dentry = lock_parent(lower_dentry);
	dget(lower_dentry);
	rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
	dput(lower_dentry);
	if (!rc && dentry->d_inode)
		clear_nlink(dentry->d_inode);
	fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
	set_nlink(dir, lower_dir_dentry->d_inode->i_nlink);
	unlock_dir(lower_dir_dentry);
	if (!rc)
		d_drop(dentry);
	dput(dentry);
	return rc;
}

/**
 * ecryptfs_show_options
 *
 * Prints the directory we are currently mounted over.
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct super_block *sb = mnt->mnt_sb;
	struct dentry *lower_root_dentry = ecryptfs_dentry_to_lower(sb->s_root);
	struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(sb->s_root);
	char *tmp_page;
	char *path;
	int rc = 0;

	tmp_page = (char *)__get_free_page(GFP_KERNEL);
	if (!tmp_page) {
		rc = -ENOMEM;
		goto out;
	}
	path = d_path(lower_root_dentry, lower_mnt, tmp_page, PAGE_SIZE);
	if (IS_ERR(path)) {
		rc = PTR_ERR(path);
		goto out;
	}
	seq_printf(m, ",dir=%s", path);
	free_page((unsigned long)tmp_page);
out:
	return rc;
}

/**
 * ecryptfs_create_underlying_file
 * @lower_dir_inode: inode of the parent in the lower fs of the new file
 * @dentry: New file's dentry
 * @mode: The mode of the new file
 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
 *
 * Creates the file in the lower file system.
 *
 * Returns zero on success; non-zero on error condition
 */
static int
ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
				struct dentry *dentry, int mode,
				struct nameidata *nd)
{
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
	struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
	struct dentry *dentry_save;
	struct vfsmount *vfsmount_save;
	unsigned int flags_save;
	int rc;

	dentry_save = nd->path.dentry;
	vfsmount_save = nd->path.mnt;
	flags_save = nd->flags;
	nd->path.dentry = lower_dentry;
	nd->path.mnt = lower_mnt;
	nd->flags &= ~LOOKUP_OPEN;
	rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd);
	nd->path.dentry = dentry_save;
	nd->path.mnt = vfsmount_save;
	nd->flags = flags_save;
	return rc;
}

/**
 * ecryptfs_open
 * @inode: inode speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct dentry *lower_dentry;
	struct ecryptfs_file_info *file_info;

	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%s]; rc = [%d]\n", __func__,
			ecryptfs_dentry->d_name.name, rc);
		goto out_free;
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
	    == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_put;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		rc = 0;
		goto out;
	}
	rc = read_or_initialize_metadata(ecryptfs_dentry);
	if (rc)
		goto out_put;
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
			"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
			(unsigned long long)i_size_read(inode));
	goto out;
out_put:
	ecryptfs_put_lower_file(inode);
out_free:
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
out:
	return rc;
}

/**
 * ecryptfs_open
 * @inode: inode speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	struct inode *lower_inode = NULL;
	struct file *lower_file = NULL;
	struct vfsmount *lower_mnt;
	struct ecryptfs_file_info *file_info;
	int lower_flags;

	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_alloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	memset(file_info, 0, sizeof(*file_info));
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mount_crypt_stat = &ecryptfs_superblock_to_private(
		ecryptfs_dentry->d_sb)->mount_crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED);
		ECRYPTFS_SET_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	lower_flags = file->f_flags;
	if ((lower_flags & O_ACCMODE) == O_WRONLY)
		lower_flags = (lower_flags & O_ACCMODE) | O_RDWR;
	if (file->f_flags & O_APPEND)
		lower_flags &= ~O_APPEND;
	lower_mnt = ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
	/* Corresponding fput() in ecryptfs_release() */
	if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, lower_mnt,
					   lower_flags))) {
		ecryptfs_printk(KERN_ERR, "Error opening lower file\n");
		goto out_puts;
	}
	ecryptfs_set_file_lower(file, lower_file);
	/* Isn't this check the same as the one in lookup? */
	lower_inode = lower_dentry->d_inode;
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		ECRYPTFS_CLEAR_FLAG(crypt_stat->flags, ECRYPTFS_ENCRYPTED);
		rc = 0;
		goto out;
	}
	mutex_lock(&crypt_stat->cs_mutex);
	if (i_size_read(lower_inode) < ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE) {
		if (!(mount_crypt_stat->flags
		      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
			rc = -EIO;
			printk(KERN_WARNING "Attempt to read file that is "
			       "not in a valid eCryptfs format, and plaintext "
			       "passthrough mode is not enabled; returning "
			       "-EIO\n");
			mutex_unlock(&crypt_stat->cs_mutex);
			goto out_puts;
		}
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		rc = 0;
		mutex_unlock(&crypt_stat->cs_mutex);
		goto out;
	} else if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
					ECRYPTFS_POLICY_APPLIED)
		   || !ECRYPTFS_CHECK_FLAG(crypt_stat->flags,
					   ECRYPTFS_KEY_VALID)) {
		rc = ecryptfs_read_headers(ecryptfs_dentry, lower_file);
		if (rc) {
			ecryptfs_printk(KERN_DEBUG,
					"Valid headers not found\n");
			if (!(mount_crypt_stat->flags
			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
				rc = -EIO;
				printk(KERN_WARNING "Attempt to read file that "
				       "is not in a valid eCryptfs format, "
				       "and plaintext passthrough mode is not "
				       "enabled; returning -EIO\n");
				mutex_unlock(&crypt_stat->cs_mutex);
				goto out_puts;
//.........这里部分代码省略.........

/**
 * ecryptfs_lookup
 * @dir: inode
 * @dentry: The dentry
 * @nd: nameidata, may be NULL
 *
 * Find a file on disk. If the file does not exist, then we'll add it to the
 * dentry cache and continue on to read it from the disk.
 */
static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
				      struct nameidata *nd)
{
	int rc = 0;
	struct dentry *lower_dir_dentry;
	struct dentry *lower_dentry;
	struct vfsmount *lower_mnt;
	char *encoded_name;
	int encoded_namelen;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	char *page_virt = NULL;
	struct inode *lower_inode;
	u64 file_size;

	lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
	dentry->d_op = &ecryptfs_dops;
	if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, "."))
	    || (dentry->d_name.len == 2
		&& !strcmp(dentry->d_name.name, ".."))) {
		d_drop(dentry);
		goto out;
	}
	encoded_namelen = ecryptfs_encode_filename(crypt_stat,
						   dentry->d_name.name,
						   dentry->d_name.len,
						   &encoded_name);
	if (encoded_namelen < 0) {
		rc = encoded_namelen;
		d_drop(dentry);
		goto out;
	}
	ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen "
			"= [%d]\n", encoded_name, encoded_namelen);
	lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry,
				      encoded_namelen - 1);
	kfree(encoded_name);
	if (IS_ERR(lower_dentry)) {
		ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n");
		rc = PTR_ERR(lower_dentry);
		d_drop(dentry);
		goto out;
	}
	lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
	ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->"
       		"d_name.name = [%s]\n", lower_dentry,
		lower_dentry->d_name.name);
	lower_inode = lower_dentry->d_inode;
	fsstack_copy_attr_atime(dir, lower_dir_dentry->d_inode);
	BUG_ON(!atomic_read(&lower_dentry->d_count));
	ecryptfs_set_dentry_private(dentry,
				    kmem_cache_alloc(ecryptfs_dentry_info_cache,
						     GFP_KERNEL));
	if (!ecryptfs_dentry_to_private(dentry)) {
		rc = -ENOMEM;
		ecryptfs_printk(KERN_ERR, "Out of memory whilst attempting "
				"to allocate ecryptfs_dentry_info struct\n");
		goto out_dput;
	}
	ecryptfs_set_dentry_lower(dentry, lower_dentry);
	ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
	if (!lower_dentry->d_inode) {
		/* We want to add because we couldn't find in lower */
		d_add(dentry, NULL);
		goto out;
	}
	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb,
				ECRYPTFS_INTERPOSE_FLAG_D_ADD);
	if (rc) {
		ecryptfs_printk(KERN_ERR, "Error interposing\n");
		goto out;
	}
	if (S_ISDIR(lower_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "Is a directory; returning\n");
		goto out;
	}
	if (S_ISLNK(lower_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "Is a symlink; returning\n");
		goto out;
	}
	if (special_file(lower_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "Is a special file; returning\n");
		goto out;
	}
	if (!nd) {
		ecryptfs_printk(KERN_DEBUG, "We have a NULL nd, just leave"
				"as we *think* we are about to unlink\n");
		goto out;
	}
	/* Released in this function */
	page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2,
//.........这里部分代码省略.........

static int ecryptfs_update_crypt_flag(struct dentry *dentry, int is_sensitive)
{
	int rc = 0;
	struct dentry *lower_dentry;
	struct inode *inode;
	struct inode *lower_inode;
	struct ecryptfs_crypt_stat *crypt_stat;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;

	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
	if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
		ecryptfs_init_crypt_stat(crypt_stat);
	inode = dentry->d_inode;
	lower_inode = ecryptfs_inode_to_lower(inode);
	lower_dentry = ecryptfs_dentry_to_lower(dentry);

	mutex_lock(&crypt_stat->cs_mutex);

	mount_crypt_stat = &ecryptfs_superblock_to_private(
			dentry->d_sb)->mount_crypt_stat;
	rc = ecryptfs_get_lower_file(dentry, inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("ecryptfs_get_lower_file rc=%d\n", rc);
		goto out;
	}

	if (is_sensitive) {
		crypt_stat->flags |= ECRYPTFS_DEK_IS_SENSITIVE;
		/*
		* Set sensirive for all the pages in the inode 
		*/
		set_sensitive_mapping_pages(inode->i_mapping, 0, -1);
	}
	else{
		crypt_stat->flags &= ~ECRYPTFS_DEK_IS_SENSITIVE;
	}

	rc = ecryptfs_write_metadata(dentry, inode);
	if (rc) {
		if (!(mount_crypt_stat->flags
				& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
			rc = -EIO;
			DEK_LOGE("Either the lower file "
					"is not in a valid eCryptfs format, "
					"or the key could not be retrieved. "
					"Plaintext passthrough mode is not "
					"enabled; returning -EIO\n");
			mutex_unlock(&crypt_stat->cs_mutex);
			DEK_LOGD("ecryptfs_write_metadata rc=%d\n", rc);
			goto out;
		}
		rc = 0;
		crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
				| ECRYPTFS_ENCRYPTED);
	}

	rc = ecryptfs_write_inode_size_to_metadata(inode);
	if (rc) {
		mutex_unlock(&crypt_stat->cs_mutex);
		DEK_LOGE("Problem with "
				"ecryptfs_write_inode_size_to_metadata; "
				"rc = [%d]\n", rc);
		goto out;
	}

	ecryptfs_put_lower_file(inode);

	mutex_unlock(&crypt_stat->cs_mutex);

out:
	fsstack_copy_attr_all(inode, lower_inode);
	return rc;
}

static int
ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
		struct inode *new_dir, struct dentry *new_dentry)
{
	int rc;
	struct dentry *lower_old_dentry;
	struct dentry *lower_new_dentry;
	struct dentry *lower_old_dir_dentry;
	struct dentry *lower_new_dir_dentry;
	struct dentry *trap = NULL;
	struct inode *target_inode;
#ifdef CONFIG_DLP
	sdp_fs_command_t *cmd1 = NULL;
	unsigned long old_inode = old_dentry->d_inode->i_ino;
#endif
#ifdef CONFIG_SDP
	sdp_fs_command_t *cmd = NULL;
	int rename_event = 0x00;
	struct ecryptfs_crypt_stat *crypt_stat =
			&(ecryptfs_inode_to_private(old_dentry->d_inode)->crypt_stat);
	struct ecryptfs_crypt_stat *parent_crypt_stat =
	        &(ecryptfs_inode_to_private(old_dentry->d_parent->d_inode)->crypt_stat);
	struct ecryptfs_crypt_stat *new_parent_crypt_stat =
	        &(ecryptfs_inode_to_private(new_dentry->d_parent->d_inode)->crypt_stat);
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
			&ecryptfs_superblock_to_private(old_dentry->d_sb)->mount_crypt_stat;

#if ECRYPTFS_SDP_RENAME_DEBUG
	printk("You're renaming %s to %s\n",
			old_dentry->d_name.name,
			new_dentry->d_name.name);
	printk("old_dentry[%p] : %s [parent %s : %s] inode:%p\n",
			old_dentry, old_dentry->d_name.name,
			old_dentry->d_parent->d_name.name,
			IS_SENSITIVE_DENTRY(old_dentry->d_parent) ? "sensitive" : "protected",
					old_dentry->d_inode);
	printk("new_dentry[%p] : %s [parent %s : %s] inode:%p\n",
			new_dentry, new_dentry->d_name.name,
			new_dentry->d_parent->d_name.name,
			IS_SENSITIVE_DENTRY(new_dentry->d_parent) ? "sensitive" : "protected",
					new_dentry->d_inode);
#endif

	if(IS_CHAMBER_DENTRY(old_dentry)) {
		printk("Rename trial on chamber : failed\n");
		return -EIO;
	}

#if 0 // kernel panic. new_crypt_stat->engine_id
	if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) &&
			IS_SENSITIVE_DENTRY(new_dentry->d_parent)) {
		if(crypt_stat->engine_id != new_crypt_stat->engine_id) {
			printk("Rename chamber file to another chamber : failed\n");
			return -EIO;
		}
	}
#endif

	if(IS_SENSITIVE_DENTRY(old_dentry->d_parent)) {
	    if(ecryptfs_is_sdp_locked(parent_crypt_stat->engine_id)) {
			printk("Rename/move trial in locked state\n");
			return -EIO;
		}
	}

	if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) &&
			IS_SENSITIVE_DENTRY(new_dentry->d_parent)) {
		if(parent_crypt_stat->engine_id != new_parent_crypt_stat->engine_id) {
	        printk("Can't move between chambers\n");
			return -EIO;
		}
	}

	if(IS_SENSITIVE_DENTRY(old_dentry->d_parent) &&
			!IS_SENSITIVE_DENTRY(new_dentry->d_parent))		
		rename_event |= ECRYPTFS_EVT_RENAME_OUT_OF_CHAMBER;

	if(!IS_SENSITIVE_DENTRY(old_dentry->d_parent) &&
			IS_SENSITIVE_DENTRY(new_dentry->d_parent))
		rename_event |= ECRYPTFS_EVT_RENAME_TO_CHAMBER;
#endif

	lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
	lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
	dget(lower_old_dentry);
	dget(lower_new_dentry);
	lower_old_dir_dentry = dget_parent(lower_old_dentry);
	lower_new_dir_dentry = dget_parent(lower_new_dentry);
	target_inode = new_dentry->d_inode;
	trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
	/* source should not be ancestor of target */
	if (trap == lower_old_dentry) {
		rc = -EINVAL;
		goto out_lock;
	}
	/* target should not be ancestor of source */
	if (trap == lower_new_dentry) {
		rc = -ENOTEMPTY;
		goto out_lock;
	}
//.........这里部分代码省略.........

/**
 * ecryptfs_lookup
 * @ecryptfs_dir_inode: The eCryptfs directory inode
 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 * @ecryptfs_nd: nameidata; may be NULL
 *
 * Find a file on disk. If the file does not exist, then we'll add it to the
 * dentry cache and continue on to read it from the disk.
 */
static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
				      struct dentry *ecryptfs_dentry,
				      struct nameidata *ecryptfs_nd)
{
	char *encrypted_and_encoded_name = NULL;
	size_t encrypted_and_encoded_name_size;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
	struct dentry *lower_dir_dentry, *lower_dentry;
	int rc = 0;

	if ((ecryptfs_dentry->d_name.len == 1
	     && !strcmp(ecryptfs_dentry->d_name.name, "."))
	    || (ecryptfs_dentry->d_name.len == 2
		&& !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
		goto out_d_drop;
	}
	lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
	mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
	lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
				      lower_dir_dentry,
				      ecryptfs_dentry->d_name.len);
	mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
	if (IS_ERR(lower_dentry)) {
		rc = PTR_ERR(lower_dentry);
		ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
				"[%d] on lower_dentry = [%s]\n", __func__, rc,
				encrypted_and_encoded_name);
		goto out_d_drop;
	}
	if (lower_dentry->d_inode)
		goto interpose;
	mount_crypt_stat = &ecryptfs_superblock_to_private(
				ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if (!(mount_crypt_stat
	    && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
		goto interpose;
	dput(lower_dentry);
	rc = ecryptfs_encrypt_and_encode_filename(
		&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
		NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
		ecryptfs_dentry->d_name.len);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to encrypt and encode "
		       "filename; rc = [%d]\n", __func__, rc);
		goto out_d_drop;
	}
	mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
	lower_dentry = lookup_one_len(encrypted_and_encoded_name,
				      lower_dir_dentry,
				      encrypted_and_encoded_name_size);
	mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
	if (IS_ERR(lower_dentry)) {
		rc = PTR_ERR(lower_dentry);
		ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
				"[%d] on lower_dentry = [%s]\n", __func__, rc,
				encrypted_and_encoded_name);
		goto out_d_drop;
	}
interpose:
	rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
				       ecryptfs_dir_inode);
	goto out;
out_d_drop:
	d_drop(ecryptfs_dentry);
out:
	kfree(encrypted_and_encoded_name);
	return ERR_PTR(rc);
}

/**
 * ecryptfs_lookup
 * @ecryptfs_dir_inode: The eCryptfs directory inode
 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 * @ecryptfs_nd: nameidata; may be NULL
 *
 * Find a file on disk. If the file does not exist, then we'll add it to the
 * dentry cache and continue on to read it from the disk.
 */
static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
				      struct dentry *ecryptfs_dentry,
				      struct nameidata *ecryptfs_nd)
{
	char *encrypted_and_encoded_name = NULL;
	size_t encrypted_and_encoded_name_size;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
	struct ecryptfs_inode_info *inode_info;
	struct dentry *lower_dir_dentry, *lower_dentry;
	int rc = 0;

	ecryptfs_dentry->d_op = &ecryptfs_dops;
	if ((ecryptfs_dentry->d_name.len == 1
	     && !strcmp(ecryptfs_dentry->d_name.name, "."))
	    || (ecryptfs_dentry->d_name.len == 2
		&& !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
		goto out_d_drop;
	}
	lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
	lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
				      lower_dir_dentry,
				      ecryptfs_dentry->d_name.len);
	if (IS_ERR(lower_dentry)) {
		rc = PTR_ERR(lower_dentry);
		printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
		       "lower_dentry = [%s]\n", __func__, rc,
		       ecryptfs_dentry->d_name.name);
		goto out_d_drop;
	}
	if (lower_dentry->d_inode)
		goto lookup_and_interpose;
	inode_info =  ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
	if (inode_info) {
		crypt_stat = &inode_info->crypt_stat;
		/* TODO: lock for crypt_stat comparison */
		if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
			ecryptfs_set_default_sizes(crypt_stat);
	}
	if (crypt_stat)
		mount_crypt_stat = crypt_stat->mount_crypt_stat;
	else
		mount_crypt_stat = &ecryptfs_superblock_to_private(
			ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if (!(crypt_stat && (crypt_stat->flags & ECRYPTFS_ENCRYPT_FILENAMES))
	    && !(mount_crypt_stat && (mount_crypt_stat->flags
				     & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
		goto lookup_and_interpose;
	dput(lower_dentry);
	rc = ecryptfs_encrypt_and_encode_filename(
		&encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
		crypt_stat, mount_crypt_stat, ecryptfs_dentry->d_name.name,
		ecryptfs_dentry->d_name.len);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to encrypt and encode "
		       "filename; rc = [%d]\n", __func__, rc);
		goto out_d_drop;
	}
	lower_dentry = lookup_one_len(encrypted_and_encoded_name,
				      lower_dir_dentry,
				      encrypted_and_encoded_name_size - 1);
	if (IS_ERR(lower_dentry)) {
		rc = PTR_ERR(lower_dentry);
		printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
		       "lower_dentry = [%s]\n", __func__, rc,
		       encrypted_and_encoded_name);
		goto out_d_drop;
	}
lookup_and_interpose:
	rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry,
						 crypt_stat, ecryptfs_dir_inode,
						 ecryptfs_nd);
	goto out;
out_d_drop:
	d_drop(ecryptfs_dentry);
out:
	kfree(encrypted_and_encoded_name);
	return ERR_PTR(rc);
}

//.........这里部分代码省略.........
			ecryptfs_set_mapping_sensitive(inode, mount_crypt_stat->userid, TO_SENSITIVE);
		}
		
		if (ecryptfs_is_sdp_locked(crypt_stat->engine_id)) {
			ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc);
		} else {
			int dek_type = crypt_stat->sdp_dek.type;

			ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc);
			if(dek_type != DEK_TYPE_AES_ENC) {
				ecryptfs_printk(KERN_DEBUG, "converting dek...\n");
				rc = ecryptfs_sdp_convert_dek(ecryptfs_dentry);
				ecryptfs_printk(KERN_DEBUG, "conversion ready, rc=%d\n", rc);
				rc = 0; // TODO: Do we need to return error if conversion fails?
			}
		}
	}
#if ECRYPTFS_DEK_DEBUG
	else {
		ecryptfs_printk(KERN_INFO, "ecryptfs_open: dek_file_type is protected\n");
	}
#endif
#endif

#ifdef CONFIG_DLP
	if(crypt_stat->flags & ECRYPTFS_DLP_ENABLED) {
#if DLP_DEBUG
		printk("DLP %s: try to open %s with crypt_stat->flags %d\n",
				__func__, ecryptfs_dentry->d_name.name, crypt_stat->flags);
#endif
		if (dlp_is_locked(mount_crypt_stat->userid)) {
			printk("%s: DLP locked\n", __func__);
			rc = -EPERM;
			goto out_put;
		}
		if(in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED)) {
			dlp_len = ecryptfs_getxattr_lower(
					ecryptfs_dentry_to_lower(ecryptfs_dentry),
					KNOX_DLP_XATTR_NAME,
					&dlp_data, sizeof(dlp_data));
			if (dlp_len == sizeof(dlp_data)) {
				getnstimeofday(&ts);
#if DLP_DEBUG
				printk("DLP %s: current time [%ld/%ld] %s\n",
						__func__, (long)ts.tv_sec, (long)dlp_data.expiry_time.tv_sec, ecryptfs_dentry->d_name.name);
#endif
				if ((ts.tv_sec > dlp_data.expiry_time.tv_sec) && dlp_isInterestedFile(ecryptfs_dentry->d_name.name)==0) {
					/* Command to delete expired file  */
					cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_REMOVE,
							current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
							inode->i_ino, GFP_KERNEL);
					rc = -ENOENT;
					goto out_put;
				}
			} else if (dlp_len == -ENODATA) {
				/* DLP flag is set, but no DLP data. Let it continue, xattr will be set later */
				printk("DLP %s: normal file [%s]\n",
						__func__, ecryptfs_dentry->d_name.name);
			} else {
				printk("DLP %s: Error, len [%ld], [%s]\n",
						__func__, (long)dlp_len, ecryptfs_dentry->d_name.name);
				rc = -EFAULT;
				goto out_put;
			}

#if DLP_DEBUG
			printk("DLP %s: DLP file [%s] opened with tgid %d, %d\n" ,
					__func__, ecryptfs_dentry->d_name.name, current->tgid, in_egroup_p(AID_KNOX_DLP_RESTRICTED));
#endif
			if(in_egroup_p(AID_KNOX_DLP_RESTRICTED)) {
				cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_OPENED,
						current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id,
						inode->i_ino, GFP_KERNEL);
			}
		} else {
			printk("DLP %s: not DLP app [%s]\n", __func__, current->comm);
			rc = -EPERM;
			goto out_put;
		}
	}
#endif

	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
			"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
			(unsigned long long)i_size_read(inode));
	goto out;
out_put:
	ecryptfs_put_lower_file(inode);
out_free:
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
out:
#ifdef CONFIG_DLP
	if(cmd) {
		sdp_fs_request(cmd, NULL);
		sdp_fs_command_free(cmd);
	}
#endif
	return rc;
}

/**
 * ecryptfs_open
 * @inode: inode speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct dentry *lower_dentry;
	struct ecryptfs_file_info *file_info;

	mount_crypt_stat = &ecryptfs_superblock_to_private(
		ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	    && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
		|| (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
		|| (file->f_flags & O_APPEND))) {
		printk(KERN_WARNING "Mount has encrypted view enabled; "
		       "files may only be read\n");
		rc = -EPERM;
		goto out;
	}
	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the persistent file for the dentry with name "
			"[%s]; rc = [%d]\n", __func__,
			ecryptfs_dentry->d_name.name, rc);
		goto out_free;
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
	    == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_free;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		rc = 0;
		goto out;
	}
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
	    || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
		rc = ecryptfs_read_metadata(ecryptfs_dentry);
		if (rc) {
			ecryptfs_printk(KERN_DEBUG,
					"Valid headers not found\n");
			if (!(mount_crypt_stat->flags
			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
				rc = -EIO;
				printk(KERN_WARNING "Either the lower file "
				       "is not in a valid eCryptfs format, "
				       "or the key could not be retrieved. "
				       "Plaintext passthrough mode is not "
				       "enabled; returning -EIO\n");
				mutex_unlock(&crypt_stat->cs_mutex);
				goto out_free;
			}
			rc = 0;
			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
			mutex_unlock(&crypt_stat->cs_mutex);
			goto out;
		}
	}
	mutex_unlock(&crypt_stat->cs_mutex);
//.........这里部分代码省略.........

/**
 * ecryptfs_open
 * @inode: inode speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct dentry *lower_dentry;
	struct ecryptfs_file_info *file_info;

	mount_crypt_stat = &ecryptfs_superblock_to_private(
		ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	    && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
		|| (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
		|| (file->f_flags & O_APPEND))) {
		printk(KERN_WARNING "Mount has encrypted view enabled; "
		       "files may only be read\n");
		rc = -EPERM;
		goto out;
	}
	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode);
	if (rc) {
		printk(KERN_ERR "%s: Error attempting to initialize "
			"the lower file for the dentry with name "
			"[%s]; rc = [%d]\n", __func__,
			ecryptfs_dentry->d_name.name, rc);
		goto out_free;
	}
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE)
	    == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out_put;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		rc = 0;
		goto out;
	}
	rc = read_or_initialize_metadata(ecryptfs_dentry);
	if (rc)
		goto out_put;
#ifdef CONFIG_SDP
	if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) {
		if (ecryptfs_is_persona_locked(crypt_stat->userid)) {
			ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc);
			if (file->f_flags & O_SDP) {
				ecryptfs_printk(KERN_INFO, "ecryptfs_open: O_SDP is set, allow open, rc=%d\n", rc);
				mutex_lock(&crypt_stat->cs_mutex);
				crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
				mutex_unlock(&crypt_stat->cs_mutex);
			} else {
				mutex_lock(&crypt_stat->cs_mutex);
				crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
				mutex_unlock(&crypt_stat->cs_mutex);
				rc = -EACCES;
				goto out_put;
			}
		} else {
			int dek_type = crypt_stat->sdp_dek.type;

			ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc);
			if(dek_type != DEK_TYPE_AES_ENC) {
				ecryptfs_printk(KERN_DEBUG, "converting dek...\n");
//.........这里部分代码省略.........

/**
 * ecryptfs_statfs
 * @sb: The ecryptfs super block
 * @buf: The struct kstatfs to fill in with stats
 *
 * Get the filesystem statistics. Currently, we let this pass right through
 * to the lower filesystem and take no action ourselves.
 */
static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	return vfs_statfs(ecryptfs_dentry_to_lower(dentry), buf);
}

/**
 * ecryptfs_lookup
 * @ecryptfs_dir_inode: The eCryptfs directory inode
 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
 * @ecryptfs_nd: nameidata; may be NULL
 *
 * Find a file on disk. If the file does not exist, then we'll add it to the
 * dentry cache and continue on to read it from the disk.
 */
static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
				      struct dentry *ecryptfs_dentry,
				      unsigned int flags)
{
	char *encrypted_and_encoded_name = NULL;
	size_t encrypted_and_encoded_name_size;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
	struct dentry *lower_dir_dentry, *lower_dentry;
	int rc = 0;

	lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
	mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
	lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
				      lower_dir_dentry,
				      ecryptfs_dentry->d_name.len);
	mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
	if (IS_ERR(lower_dentry)) {
		rc = PTR_ERR(lower_dentry);
		ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
				"[%d] on lower_dentry = [%s]\n", __func__, rc,
				ecryptfs_dentry->d_name.name);
		goto out;
	}
	if (lower_dentry->d_inode)
		goto interpose;
	m