## Block layer core configuration#config BLOCK       bool "Enable the block layer" if EMBEDDED       default y       help	 This permits the block layer to be removed from the kernel if it's not	 needed (on some embedded devices for example).  If this option is	 disabled, then blockdev files will become unusable and some	 filesystems (such as ext3) will become unavailable. 	 This option will also disable SCSI character devices and USB storage	 since they make use of various block layer definitions and	 facilities. 	 Say Y here unless you know you really don't want to mount disks and	 suchlike. if BLOCK config LBD	bool "Support for Large Block Devices"	depends on !64BIT	help	  Say Y here if you want to attach large (bigger than 2TB) discs to	  your machine, or if you want to have a raid or loopback device	  bigger than 2TB.  Otherwise say N. config BLK_DEV_IO_TRACE	bool "Support for tracing block io actions"	depends on SYSFS	select RELAY	select DEBUG_FS	help	  Say Y here, if you want to be able to trace the block layer actions	  on a given queue. Tracing allows you to see any traffic happening	  on a block device queue. For more information (and the user space	  support tools needed), fetch the blktrace app from: 	  git://brick.kernel.dk/data/git/blktrace.git config LSF	bool "Support for Large Single Files"	depends on !64BIT	help	  Say Y here if you want to be able to handle very large files (bigger	  than 2TB), otherwise say N. 	  If unsure, say Y. endif source block/Kconfig.iosched