13a65dfe8SJens Axboe# 23a65dfe8SJens Axboe# Block layer core configuration 33a65dfe8SJens Axboe# 49361401eSDavid Howellsconfig BLOCK 59361401eSDavid Howells bool "Enable the block layer" 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 Axboe#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64 233a65dfe8SJens Axboe#for instance. 243a65dfe8SJens Axboeconfig LBD 253a65dfe8SJens Axboe bool "Support for Large Block Devices" 26347a8dc3SMartin Schwidefsky depends on X86 || (MIPS && 32BIT) || PPC32 || (S390 && !64BIT) || SUPERH || UML 273a65dfe8SJens Axboe help 283a65dfe8SJens Axboe Say Y here if you want to attach large (bigger than 2TB) discs to 293a65dfe8SJens Axboe your machine, or if you want to have a raid or loopback device 303a65dfe8SJens Axboe bigger than 2TB. Otherwise say N. 313a65dfe8SJens Axboe 322056a782SJens Axboeconfig BLK_DEV_IO_TRACE 332056a782SJens Axboe bool "Support for tracing block io actions" 3409540e69SJens Axboe depends on SYSFS 352056a782SJens Axboe select RELAY 362056a782SJens Axboe select DEBUG_FS 372056a782SJens Axboe help 382056a782SJens Axboe Say Y here, if you want to be able to trace the block layer actions 392056a782SJens Axboe on a given queue. Tracing allows you to see any traffic happening 402056a782SJens Axboe on a block device queue. For more information (and the user space 412056a782SJens Axboe support tools needed), fetch the blktrace app from: 422056a782SJens Axboe 432056a782SJens Axboe git://brick.kernel.dk/data/git/blktrace.git 442056a782SJens Axboe 45a0f62ac6STakashi Satoconfig LSF 46a0f62ac6STakashi Sato bool "Support for Large Single Files" 47a0f62ac6STakashi Sato depends on X86 || (MIPS && 32BIT) || PPC32 || ARCH_S390_31 || SUPERH || UML 48a0f62ac6STakashi Sato help 4988b9adb0STrond Myklebust Say Y here if you want to be able to handle very large files (bigger 5088b9adb0STrond Myklebust than 2TB), otherwise say N. 5188b9adb0STrond Myklebust 5288b9adb0STrond Myklebust If unsure, say Y. 53a0f62ac6STakashi Sato 549361401eSDavid Howellsendif 559361401eSDavid Howells 563a65dfe8SJens Axboesource block/Kconfig.iosched 57