| # 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" |
| 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_INTEGRITY_T10 |
| tristate |
| depends on BLK_DEV_INTEGRITY |
| select CRC_T10DIF |
| select CRC64_ROCKSOFT |
| |
| 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" |
| select MQ_IOSCHED_DEADLINE |
| 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_DEV_THROTTLING_LOW |
| bool "Block throttling .low limit interface support (EXPERIMENTAL)" |
| depends on BLK_DEV_THROTTLING |
| help |
| Add .low limit interface for block throttling. The low limit is a best |
| effort limit to prioritize cgroups. Depending on the setting, the limit |
| can be used to protect cgroups in terms of bandwidth/iops and better |
| utilize disk resource. |
| |
| Note, this is an experimental interface and could be changed someday. |
| |
| 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_DEBUG_FS_ZONED |
| bool |
| default BLK_DEBUG_FS && BLK_DEV_ZONED |
| |
| 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_MQ_PCI |
| def_bool PCI |
| |
| config BLK_MQ_VIRTIO |
| bool |
| depends on VIRTIO |
| default y |
| |
| 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 |
