LXR linux/block/Kconfig

   1#
   2# Block layer core configuration
   3#
   4menuconfig BLOCK
   5       bool "Enable the block layer" if EMBEDDED
   6       default y
   7       help
   8         This permits the block layer to be removed from the kernel if it's not
   9         needed (on some embedded devices for example).  If this option is
  10         disabled, then blockdev files will become unusable and some
  11         filesystems (such as ext3) will become unavailable.
  12
  13         This option will also disable SCSI character devices and USB storage
  14         since they make use of various block layer definitions and
  15         facilities.
  16
  17         Say Y here unless you know you really don't want to mount disks and
  18         suchlike.
  19
  20if BLOCK
  21
  22config LBD
  23        bool "Support for Large Block Devices"
  24        depends on !64BIT
  25        help
  26          Say Y here if you want to attach large (bigger than 2TB) discs to
  27          your machine, or if you want to have a raid or loopback device
  28          bigger than 2TB.  Otherwise say N.
  29
  30config BLK_DEV_IO_TRACE
  31        bool "Support for tracing block io actions"
  32        depends on SYSFS
  33        select RELAY
  34        select DEBUG_FS
  35        help
  36          Say Y here, if you want to be able to trace the block layer actions
  37          on a given queue. Tracing allows you to see any traffic happening
  38          on a block device queue. For more information (and the user space
  39          support tools needed), fetch the blktrace app from:
  40
  41          git://brick.kernel.dk/data/git/blktrace.git
  42
  43config LSF
  44        bool "Support for Large Single Files"
  45        depends on !64BIT
  46        help
  47          Say Y here if you want to be able to handle very large files (bigger
  48          than 2TB), otherwise say N.
  49
  50          If unsure, say Y.
  51
  52config BLK_DEV_BSG
  53        bool "Block layer SG support v4 (EXPERIMENTAL)"
  54        depends on EXPERIMENTAL
  55        ---help---
  56        Saying Y here will enable generic SG (SCSI generic) v4 support
  57        for any block device.
  58
  59        Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  60        can handle complicated SCSI commands: tagged variable length cdbs
  61        with bidirectional data transfers and generic request/response
  62        protocols (e.g. Task Management Functions and SMP in Serial
  63        Attached SCSI).
  64
  65endif # BLOCK
  66
  67config BLOCK_COMPAT
  68        bool
  69        depends on BLOCK && COMPAT
  70        default y
  71
  72source block/Kconfig.iosched
  73