linux/block/Kconfig
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   1#
   2# Block layer core configuration
   3#
   4menuconfig BLOCK
   5       bool "Enable the block layer" if EXPERT
   6       default y
   7       select PERCPU_RWSEM
   8       help
   9         Provide block layer support for the kernel.
  10
  11         Disable this option to remove the block layer support from the
  12         kernel. This may be useful for embedded devices.
  13
  14         If this option is disabled:
  15
  16           - block device files will become unusable
  17           - some filesystems (such as ext3) will become unavailable.
  18
  19         Also, SCSI character devices and USB storage will be disabled since
  20         they make use of various block layer definitions and facilities.
  21
  22         Say Y here unless you know you really don't want to mount disks and
  23         suchlike.
  24
  25if BLOCK
  26
  27config LBDAF
  28        bool "Support for large (2TB+) block devices and files"
  29        depends on !64BIT
  30        default y
  31        help
  32          Enable block devices or files of size 2TB and larger.
  33
  34          This option is required to support the full capacity of large
  35          (2TB+) block devices, including RAID, disk, Network Block Device,
  36          Logical Volume Manager (LVM) and loopback.
  37        
  38          This option also enables support for single files larger than
  39          2TB.
  40
  41          The ext4 filesystem requires that this feature be enabled in
  42          order to support filesystems that have the huge_file feature
  43          enabled.  Otherwise, it will refuse to mount in the read-write
  44          mode any filesystems that use the huge_file feature, which is
  45          enabled by default by mke2fs.ext4.
  46
  47          The GFS2 filesystem also requires this feature.
  48
  49          If unsure, say Y.
  50
  51config BLK_DEV_BSG
  52        bool "Block layer SG support v4"
  53        default y
  54        help
  55          Saying Y here will enable generic SG (SCSI generic) v4 support
  56          for any block device.
  57
  58          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  59          can handle complicated SCSI commands: tagged variable length cdbs
  60          with bidirectional data transfers and generic request/response
  61          protocols (e.g. Task Management Functions and SMP in Serial
  62          Attached SCSI).
  63
  64          This option is required by recent UDEV versions to properly
  65          access device serial numbers, etc.
  66
  67          If unsure, say Y.
  68
  69config BLK_DEV_BSGLIB
  70        bool "Block layer SG support v4 helper lib"
  71        default n
  72        select BLK_DEV_BSG
  73        help
  74          Subsystems will normally enable this if needed. Users will not
  75          normally need to manually enable this.
  76
  77          If unsure, say N.
  78
  79config BLK_DEV_INTEGRITY
  80        bool "Block layer data integrity support"
  81        ---help---
  82        Some storage devices allow extra information to be
  83        stored/retrieved to help protect the data.  The block layer
  84        data integrity option provides hooks which can be used by
  85        filesystems to ensure better data integrity.
  86
  87        Say yes here if you have a storage device that provides the
  88        T10/SCSI Data Integrity Field or the T13/ATA External Path
  89        Protection.  If in doubt, say N.
  90
  91config BLK_DEV_THROTTLING
  92        bool "Block layer bio throttling support"
  93        depends on BLK_CGROUP=y
  94        default n
  95        ---help---
  96        Block layer bio throttling support. It can be used to limit
  97        the IO rate to a device. IO rate policies are per cgroup and
  98        one needs to mount and use blkio cgroup controller for creating
  99        cgroups and specifying per device IO rate policies.
 100
 101        See Documentation/cgroups/blkio-controller.txt for more information.
 102
 103menu "Partition Types"
 104
 105source "block/partitions/Kconfig"
 106
 107endmenu
 108
 109endif # BLOCK
 110
 111config BLOCK_COMPAT
 112        bool
 113        depends on BLOCK && COMPAT
 114        default y
 115
 116source block/Kconfig.iosched
 117
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