1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 23a65dfe8SJens Axboe# 33a65dfe8SJens Axboe# Block layer core configuration 43a65dfe8SJens Axboe# 516ed002fSJan Engelhardtmenuconfig BLOCK 66a108a14SDavid Rientjes bool "Enable the block layer" if EXPERT 79361401eSDavid Howells default y 888459642SOmar Sandoval select SBITMAP 96a83e74dSBart Van Assche select SRCU 109361401eSDavid Howells help 11ee86418dSNick Andrew Provide block layer support for the kernel. 129361401eSDavid Howells 13ee86418dSNick Andrew Disable this option to remove the block layer support from the 14ee86418dSNick Andrew kernel. This may be useful for embedded devices. 15ee86418dSNick Andrew 16ee86418dSNick Andrew If this option is disabled: 17ee86418dSNick Andrew 18ee86418dSNick Andrew - block device files will become unusable 19ee86418dSNick Andrew - some filesystems (such as ext3) will become unavailable. 20ee86418dSNick Andrew 21ee86418dSNick Andrew Also, SCSI character devices and USB storage will be disabled since 22ee86418dSNick Andrew they make use of various block layer definitions and facilities. 239361401eSDavid Howells 249361401eSDavid Howells Say Y here unless you know you really don't want to mount disks and 259361401eSDavid Howells suchlike. 269361401eSDavid Howells 279361401eSDavid Howellsif BLOCK 289361401eSDavid Howells 2990c699a9SBartlomiej Zolnierkiewiczconfig LBDAF 3090c699a9SBartlomiej Zolnierkiewicz bool "Support for large (2TB+) block devices and files" 31e6243863SMatthew Wilcox depends on !64BIT 32db29a6b4SBartlomiej Zolnierkiewicz default y 333a65dfe8SJens Axboe help 34b3a6ffe1SJens Axboe Enable block devices or files of size 2TB and larger. 35ee86418dSNick Andrew 36ee86418dSNick Andrew This option is required to support the full capacity of large 37ee86418dSNick Andrew (2TB+) block devices, including RAID, disk, Network Block Device, 38ee86418dSNick Andrew Logical Volume Manager (LVM) and loopback. 39ee86418dSNick Andrew 40b3a6ffe1SJens Axboe This option also enables support for single files larger than 41b3a6ffe1SJens Axboe 2TB. 42ee86418dSNick Andrew 434d783b09STheodore Ts'o The ext4 filesystem requires that this feature be enabled in 444d783b09STheodore Ts'o order to support filesystems that have the huge_file feature 45db29a6b4SBartlomiej Zolnierkiewicz enabled. Otherwise, it will refuse to mount in the read-write 46db29a6b4SBartlomiej Zolnierkiewicz mode any filesystems that use the huge_file feature, which is 47db29a6b4SBartlomiej Zolnierkiewicz enabled by default by mke2fs.ext4. 484d783b09STheodore Ts'o 49db29a6b4SBartlomiej Zolnierkiewicz The GFS2 filesystem also requires this feature. 50db29a6b4SBartlomiej Zolnierkiewicz 51db29a6b4SBartlomiej Zolnierkiewicz If unsure, say Y. 523a65dfe8SJens Axboe 5372148aecSChristoph Hellwigconfig BLK_SCSI_REQUEST 5472148aecSChristoph Hellwig bool 5572148aecSChristoph Hellwig 563d6392cfSJens Axboeconfig BLK_DEV_BSG 5714d9fa35SJohn Stoffel bool "Block layer SG support v4" 5814d9fa35SJohn Stoffel default y 5972148aecSChristoph Hellwig select BLK_SCSI_REQUEST 6014d9fa35SJohn Stoffel help 61319a7b7fSFUJITA Tomonori Saying Y here will enable generic SG (SCSI generic) v4 support 62319a7b7fSFUJITA Tomonori for any block device. 63319a7b7fSFUJITA Tomonori 64319a7b7fSFUJITA Tomonori Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 65319a7b7fSFUJITA Tomonori can handle complicated SCSI commands: tagged variable length cdbs 66319a7b7fSFUJITA Tomonori with bidirectional data transfers and generic request/response 67319a7b7fSFUJITA Tomonori protocols (e.g. Task Management Functions and SMP in Serial 68319a7b7fSFUJITA Tomonori Attached SCSI). 693d6392cfSJens Axboe 7014d9fa35SJohn Stoffel This option is required by recent UDEV versions to properly 7114d9fa35SJohn Stoffel access device serial numbers, etc. 7214d9fa35SJohn Stoffel 7314d9fa35SJohn Stoffel If unsure, say Y. 74ee86418dSNick Andrew 75aa387cc8SMike Christieconfig BLK_DEV_BSGLIB 76aa387cc8SMike Christie bool "Block layer SG support v4 helper lib" 77aa387cc8SMike Christie select BLK_DEV_BSG 7872148aecSChristoph Hellwig select BLK_SCSI_REQUEST 79aa387cc8SMike Christie help 80aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 81aa387cc8SMike Christie normally need to manually enable this. 82aa387cc8SMike Christie 83aa387cc8SMike Christie If unsure, say N. 84aa387cc8SMike Christie 857ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 867ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 872341c2f8SMartin K. Petersen select CRC_T10DIF if BLK_DEV_INTEGRITY 887ba1ba12SMartin K. Petersen ---help--- 897ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 907ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 917ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 927ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 937ba1ba12SMartin K. Petersen 947ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 957ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 967ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 977ba1ba12SMartin K. Petersen 986a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 996a0cb1bcSHannes Reinecke bool "Zoned block device support" 1006a0cb1bcSHannes Reinecke ---help--- 1016a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 1026a0cb1bcSHannes Reinecke support for ZAC/ZBC host-managed and host-aware zoned block devices. 1036a0cb1bcSHannes Reinecke 1046a0cb1bcSHannes Reinecke Say yes here if you have a ZAC or ZBC storage device. 1056a0cb1bcSHannes Reinecke 106e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 107e43473b7SVivek Goyal bool "Block layer bio throttling support" 1088e42e0a2SKees Cook depends on BLK_CGROUP=y 109e43473b7SVivek Goyal ---help--- 110e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 111e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 112e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 113e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 114e43473b7SVivek Goyal 1155fb94e9cSMauro Carvalho Chehab See Documentation/cgroup-v1/blkio-controller.txt for more information. 116e43473b7SVivek Goyal 117327ffb9bSShaohua Liconfig BLK_DEV_THROTTLING_LOW 118327ffb9bSShaohua Li bool "Block throttling .low limit interface support (EXPERIMENTAL)" 119327ffb9bSShaohua Li depends on BLK_DEV_THROTTLING 120327ffb9bSShaohua Li ---help--- 121327ffb9bSShaohua Li Add .low limit interface for block throttling. The low limit is a best 122327ffb9bSShaohua Li effort limit to prioritize cgroups. Depending on the setting, the limit 123327ffb9bSShaohua Li can be used to protect cgroups in terms of bandwidth/iops and better 124327ffb9bSShaohua Li utilize disk resource. 125327ffb9bSShaohua Li 126327ffb9bSShaohua Li Note, this is an experimental interface and could be changed someday. 127327ffb9bSShaohua Li 128080506adSPaul Gortmakerconfig BLK_CMDLINE_PARSER 129bab55417SCai Zhiyong bool "Block device command line partition parser" 130bab55417SCai Zhiyong ---help--- 131080506adSPaul Gortmaker Enabling this option allows you to specify the partition layout from 132080506adSPaul Gortmaker the kernel boot args. This is typically of use for embedded devices 133080506adSPaul Gortmaker which don't otherwise have any standardized method for listing the 134080506adSPaul Gortmaker partitions on a block device. 135080506adSPaul Gortmaker 136080506adSPaul Gortmaker See Documentation/block/cmdline-partition.txt for more information. 137bab55417SCai Zhiyong 13887760e5eSJens Axboeconfig BLK_WBT 13987760e5eSJens Axboe bool "Enable support for block device writeback throttling" 14087760e5eSJens Axboe ---help--- 14187760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 14287760e5eSJens Axboe background writeback from the VM, making it more smooth and having 14387760e5eSJens Axboe less impact on foreground operations. The throttling is done 14487760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 14587760e5eSJens Axboe the realtime performance of the disk. 14687760e5eSJens Axboe 147d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 148d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 149d7067512SJosef Bacik depends on BLK_CGROUP=y 150d7067512SJosef Bacik ---help--- 151d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 152d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 153d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 154d7067512SJosef Bacik target than the victimized group. 155d7067512SJosef Bacik 156d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 157d7067512SJosef Bacik 15887760e5eSJens Axboeconfig BLK_WBT_SQ 15987760e5eSJens Axboe bool "Single queue writeback throttling" 16087760e5eSJens Axboe depends on BLK_WBT 16187760e5eSJens Axboe ---help--- 16287760e5eSJens Axboe Enable writeback throttling by default on legacy single queue devices 16387760e5eSJens Axboe 16487760e5eSJens Axboeconfig BLK_WBT_MQ 16587760e5eSJens Axboe bool "Multiqueue writeback throttling" 16687760e5eSJens Axboe default y 16787760e5eSJens Axboe depends on BLK_WBT 16887760e5eSJens Axboe ---help--- 16987760e5eSJens Axboe Enable writeback throttling by default on multiqueue devices. 17087760e5eSJens Axboe Multiqueue currently doesn't have support for IO scheduling, 17187760e5eSJens Axboe enabling this option is recommended. 17287760e5eSJens Axboe 173400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 174400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 175400f73b2SOmar Sandoval default y 176400f73b2SOmar Sandoval depends on DEBUG_FS 177400f73b2SOmar Sandoval ---help--- 178400f73b2SOmar Sandoval Include block layer debugging information in debugfs. This information 179400f73b2SOmar Sandoval is mostly useful for kernel developers, but it doesn't incur any cost 180400f73b2SOmar Sandoval at runtime. 181400f73b2SOmar Sandoval 182400f73b2SOmar Sandoval Unless you are building a kernel for a tiny system, you should 183400f73b2SOmar Sandoval say Y here. 184400f73b2SOmar Sandoval 1856a5ac984SBart Van Asscheconfig BLK_DEBUG_FS_ZONED 1866a5ac984SBart Van Assche bool 1876a5ac984SBart Van Assche default BLK_DEBUG_FS && BLK_DEV_ZONED 1886a5ac984SBart Van Assche 189455a7b23SScott Bauerconfig BLK_SED_OPAL 190455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 191455a7b23SScott Bauer ---help--- 192455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 193455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 194455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 195455a7b23SScott Bauer 1969be96f3fSAl Viromenu "Partition Types" 1979be96f3fSAl Viro 1989be96f3fSAl Virosource "block/partitions/Kconfig" 1999be96f3fSAl Viro 2009be96f3fSAl Viroendmenu 2019be96f3fSAl Viro 2022b9e0aaeSLinus Torvaldsendif # BLOCK 2032b9e0aaeSLinus Torvalds 20499874d50SJens Axboeconfig BLOCK_COMPAT 20599874d50SJens Axboe bool 2062b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 20799874d50SJens Axboe default y 20899874d50SJens Axboe 2098ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 2108ec2ef2bSStephen Rothwell bool 2118ec2ef2bSStephen Rothwell depends on BLOCK && PCI 2128ec2ef2bSStephen Rothwell default y 2138ec2ef2bSStephen Rothwell 21473473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 21573473427SChristoph Hellwig bool 21673473427SChristoph Hellwig depends on BLOCK && VIRTIO 21773473427SChristoph Hellwig default y 21873473427SChristoph Hellwig 21924c5dc66SSagi Grimbergconfig BLK_MQ_RDMA 22024c5dc66SSagi Grimberg bool 22124c5dc66SSagi Grimberg depends on BLOCK && INFINIBAND 22224c5dc66SSagi Grimberg default y 22324c5dc66SSagi Grimberg 224bca6b067SBart Van Asscheconfig BLK_PM 225bca6b067SBart Van Assche def_bool BLOCK && PM 226bca6b067SBart Van Assche 2278636a1f9SMasahiro Yamadasource "block/Kconfig.iosched" 228