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#

# Block layer core configuration

#

menuconfig 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.

config BLK_DEV_BSG

        bool "Block layer SG support v4 (EXPERIMENTAL)"

        depends on EXPERIMENTAL

        ---help---

        Saying Y here will enable generic SG (SCSI generic) v4 support

        for any block device.

        Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4

        can handle complicated SCSI commands: tagged variable length cdbs

        with bidirectional data transfers and generic request/response

        protocols (e.g. Task Management Functions and SMP in Serial

        Attached SCSI).

endif # BLOCK

config BLOCK_COMPAT

        bool

        depends on BLOCK && COMPAT

        default y

source block/Kconfig.iosched