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Linux/block/Kconfig

  1 #
  2 # Block layer core configuration
  3 #
  4 menuconfig 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 
 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         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 
 92 config 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 
104 config 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 
115 menu "Partition Types"
116 
117 source "block/partitions/Kconfig"
118 
119 endmenu
120 
121 endif # BLOCK
122 
123 config BLOCK_COMPAT
124         bool
125         depends on BLOCK && COMPAT
126         default y
127 
128 config BLK_MQ_PCI
129         bool
130         depends on BLOCK && PCI
131         default y
132 
133 source block/Kconfig.iosched

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