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       select SBITMAP
   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        select CRC_T10DIF if BLK_DEV_INTEGRITY
  82        ---help---
  83        Some storage devices allow extra information to be
  84        stored/retrieved to help protect the data.  The block layer
  85        data integrity option provides hooks which can be used by
  86        filesystems to ensure better data integrity.
  87
  88        Say yes here if you have a storage device that provides the
  89        T10/SCSI Data Integrity Field or the T13/ATA External Path
  90        Protection.  If in doubt, say N.
  91
  92config BLK_DEV_THROTTLING
  93        bool "Block layer bio throttling support"
  94        depends on BLK_CGROUP=y
  95        default n
  96        ---help---
  97        Block layer bio throttling support. It can be used to limit
  98        the IO rate to a device. IO rate policies are per cgroup and
  99        one needs to mount and use blkio cgroup controller for creating
 100        cgroups and specifying per device IO rate policies.
 101
 102        See Documentation/cgroups/blkio-controller.txt for more information.
 103
 104config BLK_CMDLINE_PARSER
 105        bool "Block device command line partition parser"
 106        default n
 107        ---help---
 108        Enabling this option allows you to specify the partition layout from
 109        the kernel boot args.  This is typically of use for embedded devices
 110        which don't otherwise have any standardized method for listing the
 111        partitions on a block device.
 112
 113        See Documentation/block/cmdline-partition.txt for more information.
 114
 115menu "Partition Types"
 116
 117source "block/partitions/Kconfig"
 118
 119endmenu
 120
 121endif # BLOCK
 122
 123config BLOCK_COMPAT
 124        bool
 125        depends on BLOCK && COMPAT
 126        default y
 127
 128config BLK_MQ_PCI
 129        bool
 130        depends on BLOCK && PCI
 131        default y
 132
 133source block/Kconfig.iosched
 134