block/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Block layer core configuration
   4 #
   5 menuconfig 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
  27 if BLOCK
  28
  29 config 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
  53 config BLK_SCSI_REQUEST
  54         bool
  55
  56 config 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
  75 config 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
  85 config 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
  98 config 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
 106 config 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
 117 config 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
 128 config 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
 138 config 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
 147 config 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
 158 config BLK_WBT_MQ
 159         bool "Multiqueue writeback throttling"
 160         default y
 161         depends on BLK_WBT
 162         ---help---
 163         Enable writeback throttling by default on multiqueue devices.
 164         Multiqueue currently doesn't have support for IO scheduling,
 165         enabling this option is recommended.
 166
 167 config BLK_DEBUG_FS
 168         bool "Block layer debugging information in debugfs"
 169         default y
 170         depends on DEBUG_FS
 171         ---help---
 172         Include block layer debugging information in debugfs. This information
 173         is mostly useful for kernel developers, but it doesn't incur any cost
 174         at runtime.
 175
 176         Unless you are building a kernel for a tiny system, you should
 177         say Y here.
 178
 179 config BLK_DEBUG_FS_ZONED
 180        bool
 181        default BLK_DEBUG_FS && BLK_DEV_ZONED
 182
 183 config BLK_SED_OPAL
 184         bool "Logic for interfacing with Opal enabled SEDs"
 185         ---help---
 186         Builds Logic for interfacing with Opal enabled controllers.
 187         Enabling this option enables users to setup/unlock/lock
 188         Locking ranges for SED devices using the Opal protocol.
 189
 190 menu "Partition Types"
 191
 192 source "block/partitions/Kconfig"
 193
 194 endmenu
 195
 196 endif # BLOCK
 197
 198 config BLOCK_COMPAT
 199         bool
 200         depends on BLOCK && COMPAT
 201         default y
 202
 203 config BLK_MQ_PCI
 204         bool
 205         depends on BLOCK && PCI
 206         default y
 207
 208 config BLK_MQ_VIRTIO
 209         bool
 210         depends on BLOCK && VIRTIO
 211         default y
 212
 213 config BLK_MQ_RDMA
 214         bool
 215         depends on BLOCK && INFINIBAND
 216         default y
 217
 218 config BLK_PM
 219         def_bool BLOCK && PM
 220
 221 source "block/Kconfig.iosched"