1# 2# Block layer core configuration 3# 4menuconfig BLOCK 5 bool "Enable the block layer" if EMBEDDED 6 default y 7 help 8 This permits the block layer to be removed from the kernel if it's not 9 needed (on some embedded devices for example). If this option is 10 disabled, then blockdev files will become unusable and some 11 filesystems (such as ext3) will become unavailable. 12 13 This option will also disable SCSI character devices and USB storage 14 since they make use of various block layer definitions and 15 facilities. 16 17 Say Y here unless you know you really don't want to mount disks and 18 suchlike. 19 20if BLOCK 21 22config LBD 23 bool "Support for Large Block Devices" 24 depends on !64BIT 25 help 26 Say Y here if you want to attach large (bigger than 2TB) discs to 27 your machine, or if you want to have a raid or loopback device 28 bigger than 2TB. Otherwise say N. 29 30config BLK_DEV_IO_TRACE 31 bool "Support for tracing block io actions" 32 depends on SYSFS 33 select RELAY 34 select DEBUG_FS 35 help 36 Say Y here, if you want to be able to trace the block layer actions 37 on a given queue. Tracing allows you to see any traffic happening 38 on a block device queue. For more information (and the user space 39 support tools needed), fetch the blktrace app from: 40 41 git://git.kernel.dk/blktrace.git 42 43config LSF 44 bool "Support for Large Single Files" 45 depends on !64BIT 46 help 47 Say Y here if you want to be able to handle very large files (bigger 48 than 2TB), otherwise say N. 49 50 If unsure, say Y. 51 52config BLK_DEV_BSG 53 bool "Block layer SG support v4 (EXPERIMENTAL)" 54 depends on EXPERIMENTAL 55 ---help--- 56 Saying Y here will enable generic SG (SCSI generic) v4 support 57 for any block device. 58 59 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 60 can handle complicated SCSI commands: tagged variable length cdbs 61 with bidirectional data transfers and generic request/response 62 protocols (e.g. Task Management Functions and SMP in Serial 63 Attached SCSI). 64 65endif # BLOCK 66 67config BLOCK_COMPAT 68 bool 69 depends on BLOCK && COMPAT 70 default y 71 72source block/Kconfig.iosched 73