suse man page for debugfs_create_blob

DEBUGFS_CREATE_BLOB(9)					      The debugfs filesystem					    DEBUGFS_CREATE_BLOB(9)

NAME
       debugfs_create_blob - create a debugfs file that is used to read a binary blob

SYNOPSIS
       struct dentry * debugfs_create_blob(const char * name, mode_t mode, struct dentry * parent, struct debugfs_blob_wrapper * blob);

ARGUMENTS
       name
	   a pointer to a string containing the name of the file to create.

       mode
	   the permission that the file should have

       parent
	   a pointer to the parent dentry for this file. This should be a directory dentry if set. If this parameter is NULL, then the file will
	   be created in the root of the debugfs filesystem.

       blob
	   a pointer to a struct debugfs_blob_wrapper which contains a pointer to the blob data and the size of the data.

DESCRIPTION
       This function creates a file in debugfs with the given name that exports blob->data as a binary blob. If the mode variable is so set it can
       be read from. Writing is not supported.

       This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is
       to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be
       returned.

       If debugfs is not enabled in the kernel, the value -ENODEV will be returned. It is not wise to check for this value, but rather, check for
       NULL or !NULL instead as to eliminate the need for #ifdef in the calling code.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						    DEBUGFS_CREATE_BLOB(9)