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 2690c699a9SBartlomiej Zolnierkiewiczconfig LBDAF 2790c699a9SBartlomiej Zolnierkiewicz bool "Support for large (2TB+) block devices and files" 28e6243863SMatthew Wilcox depends on !64BIT 29db29a6b4SBartlomiej Zolnierkiewicz default y 303a65dfe8SJens Axboe help 31b3a6ffe1SJens Axboe Enable block devices or files of size 2TB and larger. 32ee86418dSNick Andrew 33ee86418dSNick Andrew This option is required to support the full capacity of large 34ee86418dSNick Andrew (2TB+) block devices, including RAID, disk, Network Block Device, 35ee86418dSNick Andrew Logical Volume Manager (LVM) and loopback. 36ee86418dSNick Andrew 37b3a6ffe1SJens Axboe This option also enables support for single files larger than 38b3a6ffe1SJens Axboe 2TB. 39ee86418dSNick Andrew 404d783b09STheodore Ts'o The ext4 filesystem requires that this feature be enabled in 414d783b09STheodore Ts'o order to support filesystems that have the huge_file feature 42db29a6b4SBartlomiej Zolnierkiewicz enabled. Otherwise, it will refuse to mount in the read-write 43db29a6b4SBartlomiej Zolnierkiewicz mode any filesystems that use the huge_file feature, which is 44db29a6b4SBartlomiej Zolnierkiewicz enabled by default by mke2fs.ext4. 454d783b09STheodore Ts'o 46db29a6b4SBartlomiej Zolnierkiewicz The GFS2 filesystem also requires this feature. 47db29a6b4SBartlomiej Zolnierkiewicz 48db29a6b4SBartlomiej Zolnierkiewicz If unsure, say Y. 493a65dfe8SJens Axboe 503d6392cfSJens Axboeconfig BLK_DEV_BSG 51319a7b7fSFUJITA Tomonori bool "Block layer SG support v4 (EXPERIMENTAL)" 5280ed71ceSJames Bottomley depends on EXPERIMENTAL 533d6392cfSJens Axboe ---help--- 54319a7b7fSFUJITA Tomonori Saying Y here will enable generic SG (SCSI generic) v4 support 55319a7b7fSFUJITA Tomonori for any block device. 56319a7b7fSFUJITA Tomonori 57319a7b7fSFUJITA Tomonori Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 58319a7b7fSFUJITA Tomonori can handle complicated SCSI commands: tagged variable length cdbs 59319a7b7fSFUJITA Tomonori with bidirectional data transfers and generic request/response 60319a7b7fSFUJITA Tomonori protocols (e.g. Task Management Functions and SMP in Serial 61319a7b7fSFUJITA Tomonori Attached SCSI). 623d6392cfSJens Axboe 63ee86418dSNick Andrew If unsure, say N. 64ee86418dSNick Andrew 657ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 667ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 677ba1ba12SMartin K. Petersen ---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 772b9e0aaeSLinus Torvaldsendif # BLOCK 782b9e0aaeSLinus Torvalds 7999874d50SJens Axboeconfig BLOCK_COMPAT 8099874d50SJens Axboe bool 812b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 8299874d50SJens Axboe default y 8399874d50SJens Axboe 843a65dfe8SJens Axboesource block/Kconfig.iosched 85