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 default n 78aa387cc8SMike Christie select BLK_DEV_BSG 7972148aecSChristoph Hellwig select BLK_SCSI_REQUEST 80aa387cc8SMike Christie help 81aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 82aa387cc8SMike Christie normally need to manually enable this. 83aa387cc8SMike Christie 84aa387cc8SMike Christie If unsure, say N. 85aa387cc8SMike Christie 867ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 877ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 882341c2f8SMartin K. Petersen select CRC_T10DIF if BLK_DEV_INTEGRITY 897ba1ba12SMartin K. Petersen ---help--- 907ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 917ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 927ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 937ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 947ba1ba12SMartin K. Petersen 957ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 967ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 977ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 987ba1ba12SMartin K. Petersen 996a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 1006a0cb1bcSHannes Reinecke bool "Zoned block device support" 1016a0cb1bcSHannes Reinecke ---help--- 1026a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 1036a0cb1bcSHannes Reinecke support for ZAC/ZBC host-managed and host-aware zoned block devices. 1046a0cb1bcSHannes Reinecke 1056a0cb1bcSHannes Reinecke Say yes here if you have a ZAC or ZBC storage device. 1066a0cb1bcSHannes Reinecke 107e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 108e43473b7SVivek Goyal bool "Block layer bio throttling support" 1098e42e0a2SKees Cook depends on BLK_CGROUP=y 110e43473b7SVivek Goyal default n 111e43473b7SVivek Goyal ---help--- 112e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 113e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 114e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 115e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 116e43473b7SVivek Goyal 1175fb94e9cSMauro Carvalho Chehab See Documentation/cgroup-v1/blkio-controller.txt for more information. 118e43473b7SVivek Goyal 119327ffb9bSShaohua Liconfig BLK_DEV_THROTTLING_LOW 120327ffb9bSShaohua Li bool "Block throttling .low limit interface support (EXPERIMENTAL)" 121327ffb9bSShaohua Li depends on BLK_DEV_THROTTLING 122327ffb9bSShaohua Li default n 123327ffb9bSShaohua Li ---help--- 124327ffb9bSShaohua Li Add .low limit interface for block throttling. The low limit is a best 125327ffb9bSShaohua Li effort limit to prioritize cgroups. Depending on the setting, the limit 126327ffb9bSShaohua Li can be used to protect cgroups in terms of bandwidth/iops and better 127327ffb9bSShaohua Li utilize disk resource. 128327ffb9bSShaohua Li 129327ffb9bSShaohua Li Note, this is an experimental interface and could be changed someday. 130327ffb9bSShaohua Li 131080506adSPaul Gortmakerconfig BLK_CMDLINE_PARSER 132bab55417SCai Zhiyong bool "Block device command line partition parser" 133bab55417SCai Zhiyong default n 134bab55417SCai Zhiyong ---help--- 135080506adSPaul Gortmaker Enabling this option allows you to specify the partition layout from 136080506adSPaul Gortmaker the kernel boot args. This is typically of use for embedded devices 137080506adSPaul Gortmaker which don't otherwise have any standardized method for listing the 138080506adSPaul Gortmaker partitions on a block device. 139080506adSPaul Gortmaker 140080506adSPaul Gortmaker See Documentation/block/cmdline-partition.txt for more information. 141bab55417SCai Zhiyong 14287760e5eSJens Axboeconfig BLK_WBT 14387760e5eSJens Axboe bool "Enable support for block device writeback throttling" 14487760e5eSJens Axboe default n 14587760e5eSJens Axboe ---help--- 14687760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 14787760e5eSJens Axboe background writeback from the VM, making it more smooth and having 14887760e5eSJens Axboe less impact on foreground operations. The throttling is done 14987760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 15087760e5eSJens Axboe the realtime performance of the disk. 15187760e5eSJens Axboe 152*d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 153*d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 154*d7067512SJosef Bacik depends on BLK_CGROUP=y 155*d7067512SJosef Bacik default n 156*d7067512SJosef Bacik ---help--- 157*d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 158*d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 159*d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 160*d7067512SJosef Bacik target than the victimized group. 161*d7067512SJosef Bacik 162*d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 163*d7067512SJosef Bacik 16487760e5eSJens Axboeconfig BLK_WBT_SQ 16587760e5eSJens Axboe bool "Single queue writeback throttling" 16687760e5eSJens Axboe default n 16787760e5eSJens Axboe depends on BLK_WBT 16887760e5eSJens Axboe ---help--- 16987760e5eSJens Axboe Enable writeback throttling by default on legacy single queue devices 17087760e5eSJens Axboe 17187760e5eSJens Axboeconfig BLK_WBT_MQ 17287760e5eSJens Axboe bool "Multiqueue writeback throttling" 17387760e5eSJens Axboe default y 17487760e5eSJens Axboe depends on BLK_WBT 17587760e5eSJens Axboe ---help--- 17687760e5eSJens Axboe Enable writeback throttling by default on multiqueue devices. 17787760e5eSJens Axboe Multiqueue currently doesn't have support for IO scheduling, 17887760e5eSJens Axboe enabling this option is recommended. 17987760e5eSJens Axboe 180400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 181400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 182400f73b2SOmar Sandoval default y 183400f73b2SOmar Sandoval depends on DEBUG_FS 184400f73b2SOmar Sandoval ---help--- 185400f73b2SOmar Sandoval Include block layer debugging information in debugfs. This information 186400f73b2SOmar Sandoval is mostly useful for kernel developers, but it doesn't incur any cost 187400f73b2SOmar Sandoval at runtime. 188400f73b2SOmar Sandoval 189400f73b2SOmar Sandoval Unless you are building a kernel for a tiny system, you should 190400f73b2SOmar Sandoval say Y here. 191400f73b2SOmar Sandoval 1926a5ac984SBart Van Asscheconfig BLK_DEBUG_FS_ZONED 1936a5ac984SBart Van Assche bool 1946a5ac984SBart Van Assche default BLK_DEBUG_FS && BLK_DEV_ZONED 1956a5ac984SBart Van Assche 196455a7b23SScott Bauerconfig BLK_SED_OPAL 197455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 198455a7b23SScott Bauer ---help--- 199455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 200455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 201455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 202455a7b23SScott Bauer 2039be96f3fSAl Viromenu "Partition Types" 2049be96f3fSAl Viro 2059be96f3fSAl Virosource "block/partitions/Kconfig" 2069be96f3fSAl Viro 2079be96f3fSAl Viroendmenu 2089be96f3fSAl Viro 2092b9e0aaeSLinus Torvaldsendif # BLOCK 2102b9e0aaeSLinus Torvalds 21199874d50SJens Axboeconfig BLOCK_COMPAT 21299874d50SJens Axboe bool 2132b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 21499874d50SJens Axboe default y 21599874d50SJens Axboe 2168ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 2178ec2ef2bSStephen Rothwell bool 2188ec2ef2bSStephen Rothwell depends on BLOCK && PCI 2198ec2ef2bSStephen Rothwell default y 2208ec2ef2bSStephen Rothwell 22173473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 22273473427SChristoph Hellwig bool 22373473427SChristoph Hellwig depends on BLOCK && VIRTIO 22473473427SChristoph Hellwig default y 22573473427SChristoph Hellwig 22624c5dc66SSagi Grimbergconfig BLK_MQ_RDMA 22724c5dc66SSagi Grimberg bool 22824c5dc66SSagi Grimberg depends on BLOCK && INFINIBAND 22924c5dc66SSagi Grimberg default y 23024c5dc66SSagi Grimberg 2313a65dfe8SJens Axboesource block/Kconfig.iosched 232