13a65dfe8SJens Axboe# 23a65dfe8SJens Axboe# Block layer core configuration 33a65dfe8SJens Axboe# 416ed002fSJan Engelhardtmenuconfig BLOCK 56a108a14SDavid Rientjes bool "Enable the block layer" if EXPERT 69361401eSDavid Howells default y 788459642SOmar Sandoval select SBITMAP 8*6a83e74dSBart Van Assche select SRCU 99361401eSDavid Howells help 10ee86418dSNick Andrew Provide block layer support for the kernel. 119361401eSDavid Howells 12ee86418dSNick Andrew Disable this option to remove the block layer support from the 13ee86418dSNick Andrew kernel. This may be useful for embedded devices. 14ee86418dSNick Andrew 15ee86418dSNick Andrew If this option is disabled: 16ee86418dSNick Andrew 17ee86418dSNick Andrew - block device files will become unusable 18ee86418dSNick Andrew - some filesystems (such as ext3) will become unavailable. 19ee86418dSNick Andrew 20ee86418dSNick Andrew Also, SCSI character devices and USB storage will be disabled since 21ee86418dSNick Andrew they make use of various block layer definitions and facilities. 229361401eSDavid Howells 239361401eSDavid Howells Say Y here unless you know you really don't want to mount disks and 249361401eSDavid Howells suchlike. 259361401eSDavid Howells 269361401eSDavid Howellsif BLOCK 279361401eSDavid Howells 2890c699a9SBartlomiej Zolnierkiewiczconfig LBDAF 2990c699a9SBartlomiej Zolnierkiewicz bool "Support for large (2TB+) block devices and files" 30e6243863SMatthew Wilcox depends on !64BIT 31db29a6b4SBartlomiej Zolnierkiewicz default y 323a65dfe8SJens Axboe help 33b3a6ffe1SJens Axboe Enable block devices or files of size 2TB and larger. 34ee86418dSNick Andrew 35ee86418dSNick Andrew This option is required to support the full capacity of large 36ee86418dSNick Andrew (2TB+) block devices, including RAID, disk, Network Block Device, 37ee86418dSNick Andrew Logical Volume Manager (LVM) and loopback. 38ee86418dSNick Andrew 39b3a6ffe1SJens Axboe This option also enables support for single files larger than 40b3a6ffe1SJens Axboe 2TB. 41ee86418dSNick Andrew 424d783b09STheodore Ts'o The ext4 filesystem requires that this feature be enabled in 434d783b09STheodore Ts'o order to support filesystems that have the huge_file feature 44db29a6b4SBartlomiej Zolnierkiewicz enabled. Otherwise, it will refuse to mount in the read-write 45db29a6b4SBartlomiej Zolnierkiewicz mode any filesystems that use the huge_file feature, which is 46db29a6b4SBartlomiej Zolnierkiewicz enabled by default by mke2fs.ext4. 474d783b09STheodore Ts'o 48db29a6b4SBartlomiej Zolnierkiewicz The GFS2 filesystem also requires this feature. 49db29a6b4SBartlomiej Zolnierkiewicz 50db29a6b4SBartlomiej Zolnierkiewicz If unsure, say Y. 513a65dfe8SJens Axboe 523d6392cfSJens Axboeconfig BLK_DEV_BSG 5314d9fa35SJohn Stoffel bool "Block layer SG support v4" 5414d9fa35SJohn Stoffel default y 5514d9fa35SJohn Stoffel help 56319a7b7fSFUJITA Tomonori Saying Y here will enable generic SG (SCSI generic) v4 support 57319a7b7fSFUJITA Tomonori for any block device. 58319a7b7fSFUJITA Tomonori 59319a7b7fSFUJITA Tomonori Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 60319a7b7fSFUJITA Tomonori can handle complicated SCSI commands: tagged variable length cdbs 61319a7b7fSFUJITA Tomonori with bidirectional data transfers and generic request/response 62319a7b7fSFUJITA Tomonori protocols (e.g. Task Management Functions and SMP in Serial 63319a7b7fSFUJITA Tomonori Attached SCSI). 643d6392cfSJens Axboe 6514d9fa35SJohn Stoffel This option is required by recent UDEV versions to properly 6614d9fa35SJohn Stoffel access device serial numbers, etc. 6714d9fa35SJohn Stoffel 6814d9fa35SJohn Stoffel If unsure, say Y. 69ee86418dSNick Andrew 70aa387cc8SMike Christieconfig BLK_DEV_BSGLIB 71aa387cc8SMike Christie bool "Block layer SG support v4 helper lib" 72aa387cc8SMike Christie default n 73aa387cc8SMike Christie select BLK_DEV_BSG 74aa387cc8SMike Christie help 75aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 76aa387cc8SMike Christie normally need to manually enable this. 77aa387cc8SMike Christie 78aa387cc8SMike Christie If unsure, say N. 79aa387cc8SMike Christie 807ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 817ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 822341c2f8SMartin K. Petersen select CRC_T10DIF if BLK_DEV_INTEGRITY 837ba1ba12SMartin K. Petersen ---help--- 847ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 857ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 867ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 877ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 887ba1ba12SMartin K. Petersen 897ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 907ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 917ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 927ba1ba12SMartin K. Petersen 936a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 946a0cb1bcSHannes Reinecke bool "Zoned block device support" 956a0cb1bcSHannes Reinecke ---help--- 966a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 976a0cb1bcSHannes Reinecke support for ZAC/ZBC host-managed and host-aware zoned block devices. 986a0cb1bcSHannes Reinecke 996a0cb1bcSHannes Reinecke Say yes here if you have a ZAC or ZBC storage device. 1006a0cb1bcSHannes Reinecke 101e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 102e43473b7SVivek Goyal bool "Block layer bio throttling support" 1038e42e0a2SKees Cook depends on BLK_CGROUP=y 104e43473b7SVivek Goyal default n 105e43473b7SVivek Goyal ---help--- 106e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 107e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 108e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 109e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 110e43473b7SVivek Goyal 111e43473b7SVivek Goyal See Documentation/cgroups/blkio-controller.txt for more information. 112e43473b7SVivek Goyal 113080506adSPaul Gortmakerconfig BLK_CMDLINE_PARSER 114bab55417SCai Zhiyong bool "Block device command line partition parser" 115bab55417SCai Zhiyong default n 116bab55417SCai Zhiyong ---help--- 117080506adSPaul Gortmaker Enabling this option allows you to specify the partition layout from 118080506adSPaul Gortmaker the kernel boot args. This is typically of use for embedded devices 119080506adSPaul Gortmaker which don't otherwise have any standardized method for listing the 120080506adSPaul Gortmaker partitions on a block device. 121080506adSPaul Gortmaker 122080506adSPaul Gortmaker See Documentation/block/cmdline-partition.txt for more information. 123bab55417SCai Zhiyong 1249be96f3fSAl Viromenu "Partition Types" 1259be96f3fSAl Viro 1269be96f3fSAl Virosource "block/partitions/Kconfig" 1279be96f3fSAl Viro 1289be96f3fSAl Viroendmenu 1299be96f3fSAl Viro 1302b9e0aaeSLinus Torvaldsendif # BLOCK 1312b9e0aaeSLinus Torvalds 13299874d50SJens Axboeconfig BLOCK_COMPAT 13399874d50SJens Axboe bool 1342b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 13599874d50SJens Axboe default y 13699874d50SJens Axboe 1378ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 1388ec2ef2bSStephen Rothwell bool 1398ec2ef2bSStephen Rothwell depends on BLOCK && PCI 1408ec2ef2bSStephen Rothwell default y 1418ec2ef2bSStephen Rothwell 1423a65dfe8SJens Axboesource block/Kconfig.iosched 143