What:		/config/usb-gadget/gadget/functions/mass_storage.name
Date:		Oct 2013
KernelVersion:	3.13
Description:
		The attributes:

		===========	==============================================
		stall		Set to permit function to halt bulk endpoints.
				Disabled on some USB devices known not to work
				correctly. You should set it to true.
		num_buffers	Number of pipeline buffers. Valid numbers
				are 2..4. Available only if
				CONFIG_USB_GADGET_DEBUG_FILES is set.
		===========	==============================================

What:		/config/usb-gadget/gadget/functions/mass_storage.name/lun.name
Date:		Oct 2013
KernelVersion:	3.13
Description:
		The attributes:

		============	==============================================
		file		The path to the backing file for the LUN.
				Required if LUN is not marked as removable.
		ro		Flag specifying access to the LUN shall be
				read-only. This is implied if CD-ROM emulation
				is enabled as well as when it was impossible
				to open "filename" in R/W mode.
		removable	Flag specifying that LUN shall be indicated as
				being removable.
		cdrom		Flag specifying that LUN shall be reported as
				being a CD-ROM.
		nofua		Flag specifying that FUA flag
				in SCSI WRITE(10,12)
		forced_eject	This write-only file is useful only when
				the function is active. It causes the backing
				file to be forcibly detached from the LUN,
				regardless of whether the host has allowed it.
				Any non-zero number of bytes written will
				result in ejection.
		============	==============================================