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This function creates a directory in securityfs with the given name.
This function returns a pointer to a dentry if it succeeds. This pointer must be passed to the securityfs_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 securityfs is not enabled in the kernel, the value -ENODEV is 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.