block/Kconfig

   1 #
   2 # Block layer core configuration
   3 #
   4 menuconfig 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
  20 if BLOCK
  21
  22 config 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
  30 config 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
  43 config 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
  52 endif # BLOCK
  53
  54 config BLK_DEV_BSG
  55         bool "Block layer SG support v4 (EXPERIMENTAL)"
  56         depends on (SCSI=y) && EXPERIMENTAL
  57         ---help---
  58         Saying Y here will enable generic SG (SCSI generic) v4 support
  59         for any block device.
  60
  61         Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  62         can handle complicated SCSI commands: tagged variable length cdbs
  63         with bidirectional data transfers and generic request/response
  64         protocols (e.g. Task Management Functions and SMP in Serial
  65         Attached SCSI).
  66
  67 source block/Kconfig.iosched