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" 28 depends on !64BIT 29 help 30 Enable block devices 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 For example, RAID devices are frequently bigger than the capacity 37 of the largest individual hard drive. 38 39 This option is not required if you have individual disk drives 40 which total 2TB+ and you are not aggregating the capacity into 41 a large block device (e.g. using RAID or LVM). 42 43 If unsure, say N. 44 45config BLK_DEV_IO_TRACE 46 bool "Support for tracing block io actions" 47 depends on SYSFS 48 select RELAY 49 select DEBUG_FS 50 help 51 Say Y here if you want to be able to trace the block layer actions 52 on a given queue. Tracing allows you to see any traffic happening 53 on a block device queue. For more information (and the userspace 54 support tools needed), fetch the blktrace tools from: 55 56 git://git.kernel.dk/blktrace.git 57 58 If unsure, say N. 59 60config LSF 61 bool "Support for Large Single Files" 62 depends on !64BIT 63 help 64 Say Y here if you want to be able to handle very large files (2TB 65 and larger), otherwise say N. 66 67 If unsure, say Y. 68 69config BLK_DEV_BSG 70 bool "Block layer SG support v4 (EXPERIMENTAL)" 71 depends on EXPERIMENTAL 72 ---help--- 73 Saying Y here will enable generic SG (SCSI generic) v4 support 74 for any block device. 75 76 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 77 can handle complicated SCSI commands: tagged variable length cdbs 78 with bidirectional data transfers and generic request/response 79 protocols (e.g. Task Management Functions and SMP in Serial 80 Attached SCSI). 81 82 If unsure, say N. 83 84config BLK_DEV_INTEGRITY 85 bool "Block layer data integrity support" 86 ---help--- 87 Some storage devices allow extra information to be 88 stored/retrieved to help protect the data. The block layer 89 data integrity option provides hooks which can be used by 90 filesystems to ensure better data integrity. 91 92 Say yes here if you have a storage device that provides the 93 T10/SCSI Data Integrity Field or the T13/ATA External Path 94 Protection. If in doubt, say N. 95 96endif # BLOCK 97 98config BLOCK_COMPAT 99 bool 100 depends on BLOCK && COMPAT 101 default y 102 103source block/Kconfig.iosched 104