1# 2# Block layer core configuration 3# 4menuconfig BLOCK 5 bool "Enable the block layer" if EMBEDDED 6 default y 7 help 8 Provide block layer support for the kernel. 9 10 Disable this option to remove the block layer support from the 11 kernel. This may be useful for embedded devices. 12 13 If this option is disabled: 14 15 - block device files will become unusable 16 - some filesystems (such as ext3) will become unavailable. 17 18 Also, SCSI character devices and USB storage will be disabled since 19 they make use of various block layer definitions and facilities. 20 21 Say Y here unless you know you really don't want to mount disks and 22 suchlike. 23 24if BLOCK 25 26config LBD 27 bool "Support for large block devices and files" 28 depends on !64BIT 29 help 30 Enable block devices or files of size 2TB and larger. 31 32 This option is required to support the full capacity of large 33 (2TB+) block devices, including RAID, disk, Network Block Device, 34 Logical Volume Manager (LVM) and loopback. 35 36 This option also enables support for single files larger than 37 2TB. 38 39 If unsure, say N. 40 41config BLK_DEV_IO_TRACE 42 bool "Support for tracing block io actions" 43 depends on SYSFS 44 select RELAY 45 select DEBUG_FS 46 select TRACEPOINTS 47 help 48 Say Y here if you want to be able to trace the block layer actions 49 on a given queue. Tracing allows you to see any traffic happening 50 on a block device queue. For more information (and the userspace 51 support tools needed), fetch the blktrace tools from: 52 53 git://git.kernel.dk/blktrace.git 54 55 If unsure, say N. 56 57config BLK_DEV_BSG 58 bool "Block layer SG support v4 (EXPERIMENTAL)" 59 depends on EXPERIMENTAL 60 ---help--- 61 Saying Y here will enable generic SG (SCSI generic) v4 support 62 for any block device. 63 64 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 65 can handle complicated SCSI commands: tagged variable length cdbs 66 with bidirectional data transfers and generic request/response 67 protocols (e.g. Task Management Functions and SMP in Serial 68 Attached SCSI). 69 70 If unsure, say N. 71 72config BLK_DEV_INTEGRITY 73 bool "Block layer data integrity support" 74 ---help--- 75 Some storage devices allow extra information to be 76 stored/retrieved to help protect the data. The block layer 77 data integrity option provides hooks which can be used by 78 filesystems to ensure better data integrity. 79 80 Say yes here if you have a storage device that provides the 81 T10/SCSI Data Integrity Field or the T13/ATA External Path 82 Protection. If in doubt, say N. 83 84endif # BLOCK 85 86config BLOCK_COMPAT 87 bool 88 depends on BLOCK && COMPAT 89 default y 90 91source block/Kconfig.iosched 92