13a65dfe8SJens Axboe# 23a65dfe8SJens Axboe# Block layer core configuration 33a65dfe8SJens Axboe# 416ed002fSJan Engelhardtmenuconfig BLOCK 551d7513aSJens Axboe bool "Enable the block layer" if EMBEDDED 69361401eSDavid Howells default y 79361401eSDavid Howells help 8ee86418dSNick Andrew Provide block layer support for the kernel. 99361401eSDavid Howells 10ee86418dSNick Andrew Disable this option to remove the block layer support from the 11ee86418dSNick Andrew kernel. This may be useful for embedded devices. 12ee86418dSNick Andrew 13ee86418dSNick Andrew If this option is disabled: 14ee86418dSNick Andrew 15ee86418dSNick Andrew - block device files will become unusable 16ee86418dSNick Andrew - some filesystems (such as ext3) will become unavailable. 17ee86418dSNick Andrew 18ee86418dSNick Andrew Also, SCSI character devices and USB storage will be disabled since 19ee86418dSNick Andrew they make use of various block layer definitions and facilities. 209361401eSDavid Howells 219361401eSDavid Howells Say Y here unless you know you really don't want to mount disks and 229361401eSDavid Howells suchlike. 239361401eSDavid Howells 249361401eSDavid Howellsif BLOCK 259361401eSDavid Howells 263a65dfe8SJens Axboeconfig LBD 27*b3a6ffe1SJens Axboe bool "Support for large block devices and files" 28e6243863SMatthew Wilcox depends on !64BIT 293a65dfe8SJens Axboe help 30*b3a6ffe1SJens Axboe Enable block devices or files of size 2TB and larger. 31ee86418dSNick Andrew 32ee86418dSNick Andrew This option is required to support the full capacity of large 33ee86418dSNick Andrew (2TB+) block devices, including RAID, disk, Network Block Device, 34ee86418dSNick Andrew Logical Volume Manager (LVM) and loopback. 35ee86418dSNick Andrew 36*b3a6ffe1SJens Axboe This option also enables support for single files larger than 37*b3a6ffe1SJens Axboe 2TB. 38ee86418dSNick Andrew 39ee86418dSNick Andrew If unsure, say N. 403a65dfe8SJens Axboe 412056a782SJens Axboeconfig BLK_DEV_IO_TRACE 422056a782SJens Axboe bool "Support for tracing block io actions" 4309540e69SJens Axboe depends on SYSFS 442056a782SJens Axboe select RELAY 452056a782SJens Axboe select DEBUG_FS 465f3ea37cSArnaldo Carvalho de Melo select TRACEPOINTS 472056a782SJens Axboe help 48ee86418dSNick Andrew Say Y here if you want to be able to trace the block layer actions 492056a782SJens Axboe on a given queue. Tracing allows you to see any traffic happening 502056a782SJens Axboe on a block device queue. For more information (and the userspace 51ee86418dSNick Andrew support tools needed), fetch the blktrace tools from: 522056a782SJens Axboe 5375ce6facSJens Axboe git://git.kernel.dk/blktrace.git 542056a782SJens Axboe 55ee86418dSNick Andrew If unsure, say N. 56ee86418dSNick Andrew 573d6392cfSJens Axboeconfig BLK_DEV_BSG 58319a7b7fSFUJITA Tomonori bool "Block layer SG support v4 (EXPERIMENTAL)" 5980ed71ceSJames Bottomley depends on EXPERIMENTAL 603d6392cfSJens Axboe ---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 70ee86418dSNick Andrew If unsure, say N. 71ee86418dSNick Andrew 727ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 737ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 747ba1ba12SMartin K. Petersen ---help--- 757ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 767ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 777ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 787ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 797ba1ba12SMartin K. Petersen 807ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 817ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 827ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 837ba1ba12SMartin K. Petersen 842b9e0aaeSLinus Torvaldsendif # BLOCK 852b9e0aaeSLinus Torvalds 8699874d50SJens Axboeconfig BLOCK_COMPAT 8799874d50SJens Axboe bool 882b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 8999874d50SJens Axboe default y 9099874d50SJens Axboe 913a65dfe8SJens Axboesource block/Kconfig.iosched 92