LXR linux/block/Kconfig

   1#
   2# Block layer core configuration
   3#
   4menuconfig BLOCK
   5       bool "Enable the block layer" if EXPERT
   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 LBDAF
  27        bool "Support for large (2TB+) block devices and files"
  28        depends on !64BIT
  29        default y
  30        help
  31          Enable block devices or files of size 2TB and larger.
  32
  33          This option is required to support the full capacity of large
  34          (2TB+) block devices, including RAID, disk, Network Block Device,
  35          Logical Volume Manager (LVM) and loopback.
  36        
  37          This option also enables support for single files larger than
  38          2TB.
  39
  40          The ext4 filesystem requires that this feature be enabled in
  41          order to support filesystems that have the huge_file feature
  42          enabled.  Otherwise, it will refuse to mount in the read-write
  43          mode any filesystems that use the huge_file feature, which is
  44          enabled by default by mke2fs.ext4.
  45
  46          The GFS2 filesystem also requires this feature.
  47
  48          If unsure, say Y.
  49
  50config BLK_DEV_BSG
  51        bool "Block layer SG support v4"
  52        default y
  53        help
  54          Saying Y here will enable generic SG (SCSI generic) v4 support
  55          for any block device.
  56
  57          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  58          can handle complicated SCSI commands: tagged variable length cdbs
  59          with bidirectional data transfers and generic request/response
  60          protocols (e.g. Task Management Functions and SMP in Serial
  61          Attached SCSI).
  62
  63          This option is required by recent UDEV versions to properly
  64          access device serial numbers, etc.
  65
  66          If unsure, say Y.
  67
  68config BLK_DEV_BSGLIB
  69        bool "Block layer SG support v4 helper lib"
  70        default n
  71        select BLK_DEV_BSG
  72        help
  73          Subsystems will normally enable this if needed. Users will not
  74          normally need to manually enable this.
  75
  76          If unsure, say N.
  77
  78config BLK_DEV_INTEGRITY
  79        bool "Block layer data integrity support"
  80        ---help---
  81        Some storage devices allow extra information to be
  82        stored/retrieved to help protect the data.  The block layer
  83        data integrity option provides hooks which can be used by
  84        filesystems to ensure better data integrity.
  85
  86        Say yes here if you have a storage device that provides the
  87        T10/SCSI Data Integrity Field or the T13/ATA External Path
  88        Protection.  If in doubt, say N.
  89
  90config BLK_DEV_THROTTLING
  91        bool "Block layer bio throttling support"
  92        depends on BLK_CGROUP=y
  93        default n
  94        ---help---
  95        Block layer bio throttling support. It can be used to limit
  96        the IO rate to a device. IO rate policies are per cgroup and
  97        one needs to mount and use blkio cgroup controller for creating
  98        cgroups and specifying per device IO rate policies.
  99
 100        See Documentation/cgroups/blkio-controller.txt for more information.
 101
 102menu "Partition Types"
 103
 104source "block/partitions/Kconfig"
 105
 106endmenu
 107
 108endif # BLOCK
 109
 110config BLOCK_COMPAT
 111        bool
 112        depends on BLOCK && COMPAT
 113        default y
 114
 115source block/Kconfig.iosched
 116