| # SPDX-License-Identifier: GPL-2.0 | |
| # | |
| # Block layer core configuration | |
| # | |
| menuconfig BLOCK | |
| bool "Enable the block layer" if EXPERT | |
| default y | |
| select FS_IOMAP | |
| select SBITMAP | |
| help | |
| Provide block layer support for the kernel. | |
| Disable this option to remove the block layer support from the | |
| kernel. This may be useful for embedded devices. | |
| If this option is disabled: | |
| - block device files will become unusable | |
| - some filesystems (such as ext3) will become unavailable. | |
| Also, SCSI character devices and USB storage will be disabled since | |
| they make use of various block layer definitions and facilities. | |
| Say Y here unless you know you really don't want to mount disks and | |
| suchlike. | |
| if BLOCK | |
| config BLOCK_LEGACY_AUTOLOAD | |
| bool "Legacy autoloading support" | |
| default y | |
| help | |
| Enable loading modules and creating block device instances based on | |
| accesses through their device special file. This is a historic Linux | |
| feature and makes no sense in a udev world where device files are | |
| created on demand, but scripts that manually create device nodes and | |
| then call losetup might rely on this behavior. | |
| config BLK_RQ_ALLOC_TIME | |
| bool | |
| config BLK_CGROUP_RWSTAT | |
| bool | |
| config BLK_CGROUP_PUNT_BIO | |
| bool | |
| config BLK_DEV_BSG_COMMON | |
| tristate | |
| config BLK_ICQ | |
| bool | |
| config BLK_DEV_BSGLIB | |
| bool "Block layer SG support v4 helper lib" | |
| select BLK_DEV_BSG_COMMON | |
| help | |
| Subsystems will normally enable this if needed. Users will not | |
| normally need to manually enable this. | |
| If unsure, say N. | |
| config BLK_DEV_INTEGRITY | |
| bool "Block layer data integrity support" | |
| select CRC_T10DIF | |
| select CRC64 | |
| help | |
| Some storage devices allow extra information to be | |
| stored/retrieved to help protect the data. The block layer | |
| data integrity option provides hooks which can be used by | |
| filesystems to ensure better data integrity. | |
| Say yes here if you have a storage device that provides the | |
| T10/SCSI Data Integrity Field or the T13/ATA External Path | |
| Protection. If in doubt, say N. | |
| config BLK_DEV_WRITE_MOUNTED | |
| bool "Allow writing to mounted block devices" | |
| default y | |
| help | |
| When a block device is mounted, writing to its buffer cache is very | |
| likely going to cause filesystem corruption. It is also rather easy to | |
| crash the kernel in this way since the filesystem has no practical way | |
| of detecting these writes to buffer cache and verifying its metadata | |
| integrity. However there are some setups that need this capability | |
| like running fsck on read-only mounted root device, modifying some | |
| features on mounted ext4 filesystem, and similar. If you say N, the | |
| kernel will prevent processes from writing to block devices that are | |
| mounted by filesystems which provides some more protection from runaway | |
| privileged processes and generally makes it much harder to crash | |
| filesystem drivers. Note however that this does not prevent | |
| underlying device(s) from being modified by other means, e.g. by | |
| directly submitting SCSI commands or through access to lower layers of | |
| storage stack. If in doubt, say Y. The configuration can be overridden | |
| with the bdev_allow_write_mounted boot option. | |
| config BLK_DEV_ZONED | |
| bool "Zoned block device support" | |
| help | |
| Block layer zoned block device support. This option enables | |
| support for ZAC/ZBC/ZNS host-managed and host-aware zoned block | |
| devices. | |
| Say yes here if you have a ZAC, ZBC, or ZNS storage device. | |
| config BLK_DEV_THROTTLING | |
| bool "Block layer bio throttling support" | |
| depends on BLK_CGROUP | |
| select BLK_CGROUP_RWSTAT | |
| help | |
| Block layer bio throttling support. It can be used to limit | |
| the IO rate to a device. IO rate policies are per cgroup and | |
| one needs to mount and use blkio cgroup controller for creating | |
| cgroups and specifying per device IO rate policies. | |
| See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. | |
| config BLK_WBT | |
| bool "Enable support for block device writeback throttling" | |
| help | |
| Enabling this option enables the block layer to throttle buffered | |
| background writeback from the VM, making it more smooth and having | |
| less impact on foreground operations. The throttling is done | |
| dynamically on an algorithm loosely based on CoDel, factoring in | |
| the realtime performance of the disk. | |
| config BLK_WBT_MQ | |
| bool "Enable writeback throttling by default" | |
| default y | |
| depends on BLK_WBT | |
| help | |
| Enable writeback throttling by default for request-based block devices. | |
| config BLK_CGROUP_IOLATENCY | |
| bool "Enable support for latency based cgroup IO protection" | |
| depends on BLK_CGROUP | |
| help | |
| Enabling this option enables the .latency interface for IO throttling. | |
| The IO controller will attempt to maintain average IO latencies below | |
| the configured latency target, throttling anybody with a higher latency | |
| target than the victimized group. | |
| Note, this is an experimental interface and could be changed someday. | |
| config BLK_CGROUP_FC_APPID | |
| bool "Enable support to track FC I/O Traffic across cgroup applications" | |
| depends on BLK_CGROUP && NVME_FC | |
| help | |
| Enabling this option enables the support to track FC I/O traffic across | |
| cgroup applications. It enables the Fabric and the storage targets to | |
| identify, monitor, and handle FC traffic based on VM tags by inserting | |
| application specific identification into the FC frame. | |
| config BLK_CGROUP_IOCOST | |
| bool "Enable support for cost model based cgroup IO controller" | |
| depends on BLK_CGROUP | |
| select BLK_RQ_ALLOC_TIME | |
| help | |
| Enabling this option enables the .weight interface for cost | |
| model based proportional IO control. The IO controller | |
| distributes IO capacity between different groups based on | |
| their share of the overall weight distribution. | |
| config BLK_CGROUP_IOPRIO | |
| bool "Cgroup I/O controller for assigning an I/O priority class" | |
| depends on BLK_CGROUP | |
| help | |
| Enable the .prio interface for assigning an I/O priority class to | |
| requests. The I/O priority class affects the order in which an I/O | |
| scheduler and block devices process requests. Only some I/O schedulers | |
| and some block devices support I/O priorities. | |
| config BLK_DEBUG_FS | |
| bool "Block layer debugging information in debugfs" | |
| default y | |
| depends on DEBUG_FS | |
| help | |
| Include block layer debugging information in debugfs. This information | |
| is mostly useful for kernel developers, but it doesn't incur any cost | |
| at runtime. | |
| Unless you are building a kernel for a tiny system, you should | |
| say Y here. | |
| config BLK_SED_OPAL | |
| bool "Logic for interfacing with Opal enabled SEDs" | |
| depends on KEYS | |
| select PSERIES_PLPKS if PPC_PSERIES | |
| select PSERIES_PLPKS_SED if PPC_PSERIES | |
| help | |
| Builds Logic for interfacing with Opal enabled controllers. | |
| Enabling this option enables users to setup/unlock/lock | |
| Locking ranges for SED devices using the Opal protocol. | |
| config BLK_INLINE_ENCRYPTION | |
| bool "Enable inline encryption support in block layer" | |
| help | |
| Build the blk-crypto subsystem. Enabling this lets the | |
| block layer handle encryption, so users can take | |
| advantage of inline encryption hardware if present. | |
| config BLK_INLINE_ENCRYPTION_FALLBACK | |
| bool "Enable crypto API fallback for blk-crypto" | |
| depends on BLK_INLINE_ENCRYPTION | |
| select CRYPTO | |
| select CRYPTO_SKCIPHER | |
| help | |
| Enabling this lets the block layer handle inline encryption | |
| by falling back to the kernel crypto API when inline | |
| encryption hardware is not present. | |
| source "block/partitions/Kconfig" | |
| config BLK_PM | |
| def_bool PM | |
| # do not use in new code | |
| config BLOCK_HOLDER_DEPRECATED | |
| bool | |
| config BLK_MQ_STACKING | |
| bool | |
| source "block/Kconfig.iosched" | |
| endif # BLOCK |