linux/block/Kconfig
<<
>>
Prefs
   1# SPDX-License-Identifier: GPL-2.0
   2#
   3# Block layer core configuration
   4#
   5menuconfig BLOCK
   6       bool "Enable the block layer" if EXPERT
   7       default y
   8       select SBITMAP
   9       select SRCU
  10       help
  11         Provide block layer support for the kernel.
  12
  13         Disable this option to remove the block layer support from the
  14         kernel. This may be useful for embedded devices.
  15
  16         If this option is disabled:
  17
  18           - block device files will become unusable
  19           - some filesystems (such as ext3) will become unavailable.
  20
  21         Also, SCSI character devices and USB storage will be disabled since
  22         they make use of various block layer definitions and facilities.
  23
  24         Say Y here unless you know you really don't want to mount disks and
  25         suchlike.
  26
  27if BLOCK
  28
  29config LBDAF
  30        bool "Support for large (2TB+) block devices and files"
  31        depends on !64BIT
  32        default y
  33        help
  34          Enable block devices or files of size 2TB and larger.
  35
  36          This option is required to support the full capacity of large
  37          (2TB+) block devices, including RAID, disk, Network Block Device,
  38          Logical Volume Manager (LVM) and loopback.
  39        
  40          This option also enables support for single files larger than
  41          2TB.
  42
  43          The ext4 filesystem requires that this feature be enabled in
  44          order to support filesystems that have the huge_file feature
  45          enabled.  Otherwise, it will refuse to mount in the read-write
  46          mode any filesystems that use the huge_file feature, which is
  47          enabled by default by mke2fs.ext4.
  48
  49          The GFS2 filesystem also requires this feature.
  50
  51          If unsure, say Y.
  52
  53config BLK_SCSI_REQUEST
  54        bool
  55
  56config BLK_DEV_BSG
  57        bool "Block layer SG support v4"
  58        default y
  59        select BLK_SCSI_REQUEST
  60        help
  61          Saying Y here will enable generic SG (SCSI generic) v4 support
  62          for any block device.
  63
  64          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  65          can handle complicated SCSI commands: tagged variable length cdbs
  66          with bidirectional data transfers and generic request/response
  67          protocols (e.g. Task Management Functions and SMP in Serial
  68          Attached SCSI).
  69
  70          This option is required by recent UDEV versions to properly
  71          access device serial numbers, etc.
  72
  73          If unsure, say Y.
  74
  75config BLK_DEV_BSGLIB
  76        bool "Block layer SG support v4 helper lib"
  77        select BLK_DEV_BSG
  78        select BLK_SCSI_REQUEST
  79        help
  80          Subsystems will normally enable this if needed. Users will not
  81          normally need to manually enable this.
  82
  83          If unsure, say N.
  84
  85config BLK_DEV_INTEGRITY
  86        bool "Block layer data integrity support"
  87        select CRC_T10DIF if BLK_DEV_INTEGRITY
  88        ---help---
  89        Some storage devices allow extra information to be
  90        stored/retrieved to help protect the data.  The block layer
  91        data integrity option provides hooks which can be used by
  92        filesystems to ensure better data integrity.
  93
  94        Say yes here if you have a storage device that provides the
  95        T10/SCSI Data Integrity Field or the T13/ATA External Path
  96        Protection.  If in doubt, say N.
  97
  98config BLK_DEV_ZONED
  99        bool "Zoned block device support"
 100        ---help---
 101        Block layer zoned block device support. This option enables
 102        support for ZAC/ZBC host-managed and host-aware zoned block devices.
 103
 104        Say yes here if you have a ZAC or ZBC storage device.
 105
 106config BLK_DEV_THROTTLING
 107        bool "Block layer bio throttling support"
 108        depends on BLK_CGROUP=y
 109        ---help---
 110        Block layer bio throttling support. It can be used to limit
 111        the IO rate to a device. IO rate policies are per cgroup and
 112        one needs to mount and use blkio cgroup controller for creating
 113        cgroups and specifying per device IO rate policies.
 114
 115        See Documentation/cgroup-v1/blkio-controller.txt for more information.
 116
 117config BLK_DEV_THROTTLING_LOW
 118        bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 119        depends on BLK_DEV_THROTTLING
 120        ---help---
 121        Add .low limit interface for block throttling. The low limit is a best
 122        effort limit to prioritize cgroups. Depending on the setting, the limit
 123        can be used to protect cgroups in terms of bandwidth/iops and better
 124        utilize disk resource.
 125
 126        Note, this is an experimental interface and could be changed someday.
 127
 128config BLK_CMDLINE_PARSER
 129        bool "Block device command line partition parser"
 130        ---help---
 131        Enabling this option allows you to specify the partition layout from
 132        the kernel boot args.  This is typically of use for embedded devices
 133        which don't otherwise have any standardized method for listing the
 134        partitions on a block device.
 135
 136        See Documentation/block/cmdline-partition.txt for more information.
 137
 138config BLK_WBT
 139        bool "Enable support for block device writeback throttling"
 140        ---help---
 141        Enabling this option enables the block layer to throttle buffered
 142        background writeback from the VM, making it more smooth and having
 143        less impact on foreground operations. The throttling is done
 144        dynamically on an algorithm loosely based on CoDel, factoring in
 145        the realtime performance of the disk.
 146
 147config BLK_CGROUP_IOLATENCY
 148        bool "Enable support for latency based cgroup IO protection"
 149        depends on BLK_CGROUP=y
 150        ---help---
 151        Enabling this option enables the .latency interface for IO throttling.
 152        The IO controller will attempt to maintain average IO latencies below
 153        the configured latency target, throttling anybody with a higher latency
 154        target than the victimized group.
 155
 156        Note, this is an experimental interface and could be changed someday.
 157
 158config BLK_WBT_SQ
 159        bool "Single queue writeback throttling"
 160        depends on BLK_WBT
 161        ---help---
 162        Enable writeback throttling by default on legacy single queue devices
 163
 164config BLK_WBT_MQ
 165        bool "Multiqueue writeback throttling"
 166        default y
 167        depends on BLK_WBT
 168        ---help---
 169        Enable writeback throttling by default on multiqueue devices.
 170        Multiqueue currently doesn't have support for IO scheduling,
 171        enabling this option is recommended.
 172
 173config BLK_DEBUG_FS
 174        bool "Block layer debugging information in debugfs"
 175        default y
 176        depends on DEBUG_FS
 177        ---help---
 178        Include block layer debugging information in debugfs. This information
 179        is mostly useful for kernel developers, but it doesn't incur any cost
 180        at runtime.
 181
 182        Unless you are building a kernel for a tiny system, you should
 183        say Y here.
 184
 185config BLK_DEBUG_FS_ZONED
 186       bool
 187       default BLK_DEBUG_FS && BLK_DEV_ZONED
 188
 189config BLK_SED_OPAL
 190        bool "Logic for interfacing with Opal enabled SEDs"
 191        ---help---
 192        Builds Logic for interfacing with Opal enabled controllers.
 193        Enabling this option enables users to setup/unlock/lock
 194        Locking ranges for SED devices using the Opal protocol.
 195
 196menu "Partition Types"
 197
 198source "block/partitions/Kconfig"
 199
 200endmenu
 201
 202endif # BLOCK
 203
 204config BLOCK_COMPAT
 205        bool
 206        depends on BLOCK && COMPAT
 207        default y
 208
 209config BLK_MQ_PCI
 210        bool
 211        depends on BLOCK && PCI
 212        default y
 213
 214config BLK_MQ_VIRTIO
 215        bool
 216        depends on BLOCK && VIRTIO
 217        default y
 218
 219config BLK_MQ_RDMA
 220        bool
 221        depends on BLOCK && INFINIBAND
 222        default y
 223
 224config BLK_PM
 225        def_bool BLOCK && PM
 226
 227source block/Kconfig.iosched
 228