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 89361401eSDavid Howells This permits the block layer to be removed from the kernel if it's not 99361401eSDavid Howells needed (on some embedded devices for example). If this option is 109361401eSDavid Howells disabled, then blockdev files will become unusable and some 119361401eSDavid Howells filesystems (such as ext3) will become unavailable. 129361401eSDavid Howells 139361401eSDavid Howells This option will also disable SCSI character devices and USB storage 149361401eSDavid Howells since they make use of various block layer definitions and 159361401eSDavid Howells facilities. 169361401eSDavid Howells 179361401eSDavid Howells Say Y here unless you know you really don't want to mount disks and 189361401eSDavid Howells suchlike. 199361401eSDavid Howells 209361401eSDavid Howellsif BLOCK 219361401eSDavid Howells 223a65dfe8SJens Axboeconfig LBD 233a65dfe8SJens Axboe bool "Support for Large Block Devices" 24e6243863SMatthew Wilcox depends on !64BIT 253a65dfe8SJens Axboe help 263a65dfe8SJens Axboe Say Y here if you want to attach large (bigger than 2TB) discs to 273a65dfe8SJens Axboe your machine, or if you want to have a raid or loopback device 283a65dfe8SJens Axboe bigger than 2TB. Otherwise say N. 293a65dfe8SJens Axboe 302056a782SJens Axboeconfig BLK_DEV_IO_TRACE 312056a782SJens Axboe bool "Support for tracing block io actions" 3209540e69SJens Axboe depends on SYSFS 332056a782SJens Axboe select RELAY 342056a782SJens Axboe select DEBUG_FS 352056a782SJens Axboe help 362056a782SJens Axboe Say Y here, if you want to be able to trace the block layer actions 372056a782SJens Axboe on a given queue. Tracing allows you to see any traffic happening 382056a782SJens Axboe on a block device queue. For more information (and the user space 392056a782SJens Axboe support tools needed), fetch the blktrace app from: 402056a782SJens Axboe 412056a782SJens Axboe git://brick.kernel.dk/data/git/blktrace.git 422056a782SJens Axboe 43a0f62ac6STakashi Satoconfig LSF 44a0f62ac6STakashi Sato bool "Support for Large Single Files" 45e6243863SMatthew Wilcox depends on !64BIT 46a0f62ac6STakashi Sato help 4788b9adb0STrond Myklebust Say Y here if you want to be able to handle very large files (bigger 4888b9adb0STrond Myklebust than 2TB), otherwise say N. 4988b9adb0STrond Myklebust 5088b9adb0STrond Myklebust If unsure, say Y. 51a0f62ac6STakashi Sato 523d6392cfSJens Axboeconfig BLK_DEV_BSG 53319a7b7fSFUJITA Tomonori bool "Block layer SG support v4 (EXPERIMENTAL)" 5480ed71ceSJames Bottomley depends on EXPERIMENTAL 553d6392cfSJens Axboe ---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 652b9e0aaeSLinus Torvaldsendif # BLOCK 662b9e0aaeSLinus Torvalds 6799874d50SJens Axboeconfig BLOCK_COMPAT 6899874d50SJens Axboe bool 692b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 7099874d50SJens Axboe default y 7199874d50SJens Axboe 723a65dfe8SJens Axboesource block/Kconfig.iosched 73