Kconfig

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    1 #
    2 # Block layer core configuration
    3 #
    4 menuconfig 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 
   25 if BLOCK
   26 
   27 config 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 
   51 config 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 
   69 config 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 
   79 config 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 
   91 config 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 
  103 menu "Partition Types"
  104 
  105 source "block/partitions/Kconfig"
  106 
  107 endmenu
  108 
  109 endif # BLOCK
  110 
  111 config BLOCK_COMPAT
  112         bool
  113         depends on BLOCK && COMPAT
  114         default y
  115 
  116 source block/Kconfig.iosched

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sys/block/Kconfig