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 8487c607dSChristoph Hellwig select FS_IOMAP 988459642SOmar Sandoval select SBITMAP 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 29fbdee71bSChristoph Hellwigconfig BLOCK_LEGACY_AUTOLOAD 30fbdee71bSChristoph Hellwig bool "Legacy autoloading support" 31451f0b6fSChristoph Hellwig default y 32fbdee71bSChristoph Hellwig help 33fbdee71bSChristoph Hellwig Enable loading modules and creating block device instances based on 34fbdee71bSChristoph Hellwig accesses through their device special file. This is a historic Linux 35fbdee71bSChristoph Hellwig feature and makes no sense in a udev world where device files are 36451f0b6fSChristoph Hellwig created on demand, but scripts that manually create device nodes and 37451f0b6fSChristoph Hellwig then call losetup might rely on this behavior. 38fbdee71bSChristoph Hellwig 396f816b4bSTejun Heoconfig BLK_RQ_ALLOC_TIME 406f816b4bSTejun Heo bool 416f816b4bSTejun Heo 421d156646STejun Heoconfig BLK_CGROUP_RWSTAT 431d156646STejun Heo bool 441d156646STejun Heo 452c275afeSChristoph Hellwigconfig BLK_CGROUP_PUNT_BIO 462c275afeSChristoph Hellwig bool 472c275afeSChristoph Hellwig 4878011042SChristoph Hellwigconfig BLK_DEV_BSG_COMMON 4978011042SChristoph Hellwig tristate 50ee86418dSNick Andrew 515ef16305SChristoph Hellwigconfig BLK_ICQ 525ef16305SChristoph Hellwig bool 535ef16305SChristoph Hellwig 54aa387cc8SMike Christieconfig BLK_DEV_BSGLIB 55aa387cc8SMike Christie bool "Block layer SG support v4 helper lib" 5678011042SChristoph Hellwig select BLK_DEV_BSG_COMMON 57aa387cc8SMike Christie help 58aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 59aa387cc8SMike Christie normally need to manually enable this. 60aa387cc8SMike Christie 61aa387cc8SMike Christie If unsure, say N. 62aa387cc8SMike Christie 637ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 647ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 65*e9f5f44aSChristoph Hellwig select CRC_T10DIF 66*e9f5f44aSChristoph Hellwig select CRC64_ROCKSOFT 67a7f7f624SMasahiro Yamada help 687ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 697ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 707ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 717ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 727ba1ba12SMartin K. Petersen 737ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 747ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 757ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 767ba1ba12SMartin K. Petersen 77ed5cc702SJan Karaconfig BLK_DEV_WRITE_MOUNTED 78ed5cc702SJan Kara bool "Allow writing to mounted block devices" 79ed5cc702SJan Kara default y 80ed5cc702SJan Kara help 81ed5cc702SJan Kara When a block device is mounted, writing to its buffer cache is very 82ed5cc702SJan Kara likely going to cause filesystem corruption. It is also rather easy to 83ed5cc702SJan Kara crash the kernel in this way since the filesystem has no practical way 84ed5cc702SJan Kara of detecting these writes to buffer cache and verifying its metadata 85ed5cc702SJan Kara integrity. However there are some setups that need this capability 86ed5cc702SJan Kara like running fsck on read-only mounted root device, modifying some 87ed5cc702SJan Kara features on mounted ext4 filesystem, and similar. If you say N, the 88ed5cc702SJan Kara kernel will prevent processes from writing to block devices that are 89ed5cc702SJan Kara mounted by filesystems which provides some more protection from runaway 90ed5cc702SJan Kara privileged processes and generally makes it much harder to crash 91ed5cc702SJan Kara filesystem drivers. Note however that this does not prevent 92ed5cc702SJan Kara underlying device(s) from being modified by other means, e.g. by 93ed5cc702SJan Kara directly submitting SCSI commands or through access to lower layers of 94ed5cc702SJan Kara storage stack. If in doubt, say Y. The configuration can be overridden 95ed5cc702SJan Kara with the bdev_allow_write_mounted boot option. 96ed5cc702SJan Kara 976a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 986a0cb1bcSHannes Reinecke bool "Zoned block device support" 99a7f7f624SMasahiro Yamada help 1006a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 101240e6ee2SKeith Busch support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 102240e6ee2SKeith Busch devices. 1036a0cb1bcSHannes Reinecke 104240e6ee2SKeith Busch Say yes here if you have a ZAC, ZBC, or ZNS storage device. 1056a0cb1bcSHannes Reinecke 106e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 107e43473b7SVivek Goyal bool "Block layer bio throttling support" 108df252bdeSMasahiro Yamada depends on BLK_CGROUP 1091d156646STejun Heo select BLK_CGROUP_RWSTAT 110a7f7f624SMasahiro Yamada help 111e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 112e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 113e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 114e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 115e43473b7SVivek Goyal 116da82c92fSMauro Carvalho Chehab See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 117e43473b7SVivek Goyal 11887760e5eSJens Axboeconfig BLK_WBT 11987760e5eSJens Axboe bool "Enable support for block device writeback throttling" 120a7f7f624SMasahiro Yamada help 12187760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 12287760e5eSJens Axboe background writeback from the VM, making it more smooth and having 12387760e5eSJens Axboe less impact on foreground operations. The throttling is done 12487760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 12587760e5eSJens Axboe the realtime performance of the disk. 12687760e5eSJens Axboe 1275f6776baSBart Van Asscheconfig BLK_WBT_MQ 1285f6776baSBart Van Assche bool "Enable writeback throttling by default" 1295f6776baSBart Van Assche default y 1305f6776baSBart Van Assche depends on BLK_WBT 1315f6776baSBart Van Assche help 1325f6776baSBart Van Assche Enable writeback throttling by default for request-based block devices. 1335f6776baSBart Van Assche 134d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 135d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 136df252bdeSMasahiro Yamada depends on BLK_CGROUP 137a7f7f624SMasahiro Yamada help 138d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 139d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 140d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 141d7067512SJosef Bacik target than the victimized group. 142d7067512SJosef Bacik 143d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 144d7067512SJosef Bacik 145d2bcbeabSMuneendra Kumarconfig BLK_CGROUP_FC_APPID 146d2bcbeabSMuneendra Kumar bool "Enable support to track FC I/O Traffic across cgroup applications" 147d2500a0cSMartin K. Petersen depends on BLK_CGROUP && NVME_FC 148d2bcbeabSMuneendra Kumar help 149d2bcbeabSMuneendra Kumar Enabling this option enables the support to track FC I/O traffic across 150d2bcbeabSMuneendra Kumar cgroup applications. It enables the Fabric and the storage targets to 151d2bcbeabSMuneendra Kumar identify, monitor, and handle FC traffic based on VM tags by inserting 152d2bcbeabSMuneendra Kumar application specific identification into the FC frame. 153d2bcbeabSMuneendra Kumar 1547caa4715STejun Heoconfig BLK_CGROUP_IOCOST 1557caa4715STejun Heo bool "Enable support for cost model based cgroup IO controller" 156df252bdeSMasahiro Yamada depends on BLK_CGROUP 1577caa4715STejun Heo select BLK_RQ_ALLOC_TIME 158a7f7f624SMasahiro Yamada help 1597caa4715STejun Heo Enabling this option enables the .weight interface for cost 1607caa4715STejun Heo model based proportional IO control. The IO controller 1617caa4715STejun Heo distributes IO capacity between different groups based on 1627caa4715STejun Heo their share of the overall weight distribution. 1637caa4715STejun Heo 164556910e3SBart Van Asscheconfig BLK_CGROUP_IOPRIO 165556910e3SBart Van Assche bool "Cgroup I/O controller for assigning an I/O priority class" 166556910e3SBart Van Assche depends on BLK_CGROUP 167556910e3SBart Van Assche help 168556910e3SBart Van Assche Enable the .prio interface for assigning an I/O priority class to 169556910e3SBart Van Assche requests. The I/O priority class affects the order in which an I/O 170556910e3SBart Van Assche scheduler and block devices process requests. Only some I/O schedulers 171556910e3SBart Van Assche and some block devices support I/O priorities. 172556910e3SBart Van Assche 173400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 174400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 175400f73b2SOmar Sandoval default y 176400f73b2SOmar Sandoval depends on DEBUG_FS 177a7f7f624SMasahiro Yamada 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 185455a7b23SScott Bauerconfig BLK_SED_OPAL 186455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 1873bfeb612SGreg Joyce depends on KEYS 1883bfeb612SGreg Joyce select PSERIES_PLPKS if PPC_PSERIES 189ec8cf230SGreg Joyce select PSERIES_PLPKS_SED if PPC_PSERIES 190a7f7f624SMasahiro Yamada help 191455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 192455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 193455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 194455a7b23SScott Bauer 1951b262839SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION 1961b262839SSatya Tangirala bool "Enable inline encryption support in block layer" 1971b262839SSatya Tangirala help 1981b262839SSatya Tangirala Build the blk-crypto subsystem. Enabling this lets the 1991b262839SSatya Tangirala block layer handle encryption, so users can take 2001b262839SSatya Tangirala advantage of inline encryption hardware if present. 2011b262839SSatya Tangirala 202488f6682SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION_FALLBACK 203488f6682SSatya Tangirala bool "Enable crypto API fallback for blk-crypto" 204488f6682SSatya Tangirala depends on BLK_INLINE_ENCRYPTION 205488f6682SSatya Tangirala select CRYPTO 206488f6682SSatya Tangirala select CRYPTO_SKCIPHER 207488f6682SSatya Tangirala help 208488f6682SSatya Tangirala Enabling this lets the block layer handle inline encryption 209488f6682SSatya Tangirala by falling back to the kernel crypto API when inline 210488f6682SSatya Tangirala encryption hardware is not present. 211488f6682SSatya Tangirala 2129be96f3fSAl Virosource "block/partitions/Kconfig" 2139be96f3fSAl Viro 2148ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 215c50fca55SMasahiro Yamada def_bool PCI 2168ec2ef2bSStephen Rothwell 21773473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 21873473427SChristoph Hellwig bool 219c50fca55SMasahiro Yamada depends on VIRTIO 22073473427SChristoph Hellwig default y 22173473427SChristoph Hellwig 222bca6b067SBart Van Asscheconfig BLK_PM 223c50fca55SMasahiro Yamada def_bool PM 224bca6b067SBart Van Assche 225c66fd019SChristoph Hellwig# do not use in new code 226c66fd019SChristoph Hellwigconfig BLOCK_HOLDER_DEPRECATED 227c66fd019SChristoph Hellwig bool 228c66fd019SChristoph Hellwig 229248c7933SChristoph Hellwigconfig BLK_MQ_STACKING 230248c7933SChristoph Hellwig bool 231248c7933SChristoph Hellwig 2328636a1f9SMasahiro Yamadasource "block/Kconfig.iosched" 233c50fca55SMasahiro Yamada 234c50fca55SMasahiro Yamadaendif # BLOCK 235