# SPDX-License-Identifier: GPL-2.0
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#
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# Block layer core configuration
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#
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menuconfig BLOCK
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bool "Enable the block layer" if EXPERT
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default y
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select SBITMAP
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select SRCU
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help
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Provide block layer support for the kernel.
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Disable this option to remove the block layer support from the
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kernel. This may be useful for embedded devices.
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If this option is disabled:
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- block device files will become unusable
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- some filesystems (such as ext3) will become unavailable.
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Also, SCSI character devices and USB storage will be disabled since
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they make use of various block layer definitions and facilities.
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Say Y here unless you know you really don't want to mount disks and
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suchlike.
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if BLOCK
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config BLK_RQ_ALLOC_TIME
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bool
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config BLK_SCSI_REQUEST
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bool
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config BLK_CGROUP_RWSTAT
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bool
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config BLK_DEV_BSG
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bool "Block layer SG support v4"
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default y
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select BLK_SCSI_REQUEST
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help
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Saying Y here will enable generic SG (SCSI generic) v4 support
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for any block device.
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Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
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can handle complicated SCSI commands: tagged variable length cdbs
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with bidirectional data transfers and generic request/response
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protocols (e.g. Task Management Functions and SMP in Serial
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Attached SCSI).
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This option is required by recent UDEV versions to properly
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access device serial numbers, etc.
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If unsure, say Y.
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config BLK_DEV_BSGLIB
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bool "Block layer SG support v4 helper lib"
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select BLK_DEV_BSG
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select BLK_SCSI_REQUEST
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help
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Subsystems will normally enable this if needed. Users will not
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normally need to manually enable this.
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If unsure, say N.
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config BLK_DEV_INTEGRITY
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bool "Block layer data integrity support"
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help
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Some storage devices allow extra information to be
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stored/retrieved to help protect the data. The block layer
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data integrity option provides hooks which can be used by
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filesystems to ensure better data integrity.
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Say yes here if you have a storage device that provides the
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T10/SCSI Data Integrity Field or the T13/ATA External Path
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Protection. If in doubt, say N.
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config BLK_DEV_INTEGRITY_T10
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tristate
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depends on BLK_DEV_INTEGRITY
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select CRC_T10DIF
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config BLK_DEV_ZONED
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bool "Zoned block device support"
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select MQ_IOSCHED_DEADLINE
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help
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Block layer zoned block device support. This option enables
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support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
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devices.
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Say yes here if you have a ZAC, ZBC, or ZNS storage device.
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config BLK_DEV_THROTTLING
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bool "Block layer bio throttling support"
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depends on BLK_CGROUP=y
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select BLK_CGROUP_RWSTAT
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help
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Block layer bio throttling support. It can be used to limit
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the IO rate to a device. IO rate policies are per cgroup and
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one needs to mount and use blkio cgroup controller for creating
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cgroups and specifying per device IO rate policies.
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See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
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config BLK_DEV_THROTTLING_LOW
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bool "Block throttling .low limit interface support (EXPERIMENTAL)"
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depends on BLK_DEV_THROTTLING
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help
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Add .low limit interface for block throttling. The low limit is a best
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effort limit to prioritize cgroups. Depending on the setting, the limit
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can be used to protect cgroups in terms of bandwidth/iops and better
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utilize disk resource.
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Note, this is an experimental interface and could be changed someday.
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config BLK_CMDLINE_PARSER
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bool "Block device command line partition parser"
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help
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Enabling this option allows you to specify the partition layout from
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the kernel boot args. This is typically of use for embedded devices
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which don't otherwise have any standardized method for listing the
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partitions on a block device.
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See Documentation/block/cmdline-partition.rst for more information.
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config BLK_WBT
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bool "Enable support for block device writeback throttling"
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help
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Enabling this option enables the block layer to throttle buffered
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background writeback from the VM, making it more smooth and having
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less impact on foreground operations. The throttling is done
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dynamically on an algorithm loosely based on CoDel, factoring in
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the realtime performance of the disk.
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config BLK_WBT_MQ
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bool "Enable writeback throttling by default"
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default y
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depends on BLK_WBT
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help
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Enable writeback throttling by default for request-based block devices.
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config BLK_CGROUP_IOLATENCY
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bool "Enable support for latency based cgroup IO protection"
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depends on BLK_CGROUP=y
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help
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Enabling this option enables the .latency interface for IO throttling.
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The IO controller will attempt to maintain average IO latencies below
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the configured latency target, throttling anybody with a higher latency
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target than the victimized group.
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Note, this is an experimental interface and could be changed someday.
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config BLK_CGROUP_IOCOST
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bool "Enable support for cost model based cgroup IO controller"
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depends on BLK_CGROUP=y
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select BLK_RQ_IO_DATA_LEN
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select BLK_RQ_ALLOC_TIME
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help
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Enabling this option enables the .weight interface for cost
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model based proportional IO control. The IO controller
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distributes IO capacity between different groups based on
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their share of the overall weight distribution.
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config BLK_CGROUP_IOPRIO
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bool "Cgroup I/O controller for assigning an I/O priority class"
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depends on BLK_CGROUP
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help
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Enable the .prio interface for assigning an I/O priority class to
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requests. The I/O priority class affects the order in which an I/O
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scheduler and block devices process requests. Only some I/O schedulers
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and some block devices support I/O priorities.
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config BLK_DEBUG_FS
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bool "Block layer debugging information in debugfs"
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default y
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depends on DEBUG_FS
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help
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Include block layer debugging information in debugfs. This information
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is mostly useful for kernel developers, but it doesn't incur any cost
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at runtime.
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Unless you are building a kernel for a tiny system, you should
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say Y here.
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config BLK_DEBUG_FS_ZONED
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bool
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default BLK_DEBUG_FS && BLK_DEV_ZONED
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config BLK_SED_OPAL
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bool "Logic for interfacing with Opal enabled SEDs"
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help
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Builds Logic for interfacing with Opal enabled controllers.
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Enabling this option enables users to setup/unlock/lock
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Locking ranges for SED devices using the Opal protocol.
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config BLK_INLINE_ENCRYPTION
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bool "Enable inline encryption support in block layer"
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help
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Build the blk-crypto subsystem. Enabling this lets the
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block layer handle encryption, so users can take
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advantage of inline encryption hardware if present.
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config BLK_INLINE_ENCRYPTION_FALLBACK
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bool "Enable crypto API fallback for blk-crypto"
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depends on BLK_INLINE_ENCRYPTION
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select CRYPTO
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select CRYPTO_SKCIPHER
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help
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Enabling this lets the block layer handle inline encryption
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by falling back to the kernel crypto API when inline
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encryption hardware is not present.
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menu "Partition Types"
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source "block/partitions/Kconfig"
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endmenu
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endif # BLOCK
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config BLOCK_COMPAT
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bool
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depends on BLOCK && COMPAT
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default y
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config BLK_MQ_PCI
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bool
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depends on BLOCK && PCI
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default y
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config BLK_MQ_VIRTIO
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tristate
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depends on BLOCK && VIRTIO
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default y
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config BLK_MQ_RDMA
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bool
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depends on BLOCK && INFINIBAND
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default y
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config BLK_PM
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def_bool BLOCK && PM
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source "block/Kconfig.iosched"
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