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         Provide block layer support for the kernel.
   9
  10         Disable this option to remove the block layer support from the
  11         kernel. This may be useful for embedded devices.
  12
  13         If this option is disabled:
  14
  15           - block device files will become unusable
  16           - some filesystems (such as ext3) will become unavailable.
  17
  18         Also, SCSI character devices and USB storage will be disabled since
  19         they make use of various block layer definitions and facilities.
  20
  21         Say Y here unless you know you really don't want to mount disks and
  22         suchlike.
  23
  24if BLOCK
  25
  26config LBD
  27        bool "Support for Large Block Devices"
  28        depends on !64BIT
  29        help
  30          Enable block devices of size 2TB and larger.
  31
  32          This option is required to support the full capacity of large
  33          (2TB+) block devices, including RAID, disk, Network Block Device,
  34          Logical Volume Manager (LVM) and loopback.
  35
  36          For example, RAID devices are frequently bigger than the capacity
  37          of the largest individual hard drive.
  38
  39          This option is not required if you have individual disk drives
  40          which total 2TB+ and you are not aggregating the capacity into
  41          a large block device (e.g. using RAID or LVM).
  42
  43          If unsure, say N.
  44
  45config BLK_DEV_IO_TRACE
  46        bool "Support for tracing block io actions"
  47        depends on SYSFS
  48        select RELAY
  49        select DEBUG_FS
  50        help
  51          Say Y here if you want to be able to trace the block layer actions
  52          on a given queue. Tracing allows you to see any traffic happening
  53          on a block device queue. For more information (and the userspace
  54          support tools needed), fetch the blktrace tools from:
  55
  56          git://git.kernel.dk/blktrace.git
  57
  58          If unsure, say N.
  59
  60config LSF
  61        bool "Support for Large Single Files"
  62        depends on !64BIT
  63        help
  64          Say Y here if you want to be able to handle very large files (2TB
  65          and larger), otherwise say N.
  66
  67          If unsure, say Y.
  68
  69config BLK_DEV_BSG
  70        bool "Block layer SG support v4 (EXPERIMENTAL)"
  71        depends on EXPERIMENTAL
  72        ---help---
  73          Saying Y here will enable generic SG (SCSI generic) v4 support
  74          for any block device.
  75
  76          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  77          can handle complicated SCSI commands: tagged variable length cdbs
  78          with bidirectional data transfers and generic request/response
  79          protocols (e.g. Task Management Functions and SMP in Serial
  80          Attached SCSI).
  81
  82          If unsure, say N.
  83
  84config BLK_DEV_INTEGRITY
  85        bool "Block layer data integrity support"
  86        ---help---
  87        Some storage devices allow extra information to be
  88        stored/retrieved to help protect the data.  The block layer
  89        data integrity option provides hooks which can be used by
  90        filesystems to ensure better data integrity.
  91
  92        Say yes here if you have a storage device that provides the
  93        T10/SCSI Data Integrity Field or the T13/ATA External Path
  94        Protection.  If in doubt, say N.
  95
  96endif # BLOCK
  97
  98config BLOCK_COMPAT
  99        bool
 100        depends on BLOCK && COMPAT
 101        default y
 102
 103source block/Kconfig.iosched
 104