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          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
  24 if BLOCK
  25
  26 config 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
  45 config 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
  60 config 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
  69 config 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
  84 endif # BLOCK
  85
  86 config BLOCK_COMPAT
  87         bool
  88         depends on BLOCK && COMPAT
  89         default y
  90
  91 source block/Kconfig.iosched