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 The ext4 filesystem requires that this feature be enabled in 40 order to support filesystems that have the huge_file feature 41 enabled. Otherwise, it will refuse to mount any filesystems 42 that use the huge_file feature, which is enabled by default 43 by mke2fs.ext4. The GFS2 filesystem also requires this feature. 44 45 If unsure, say N. 46 47config BLK_DEV_IO_TRACE 48 bool "Support for tracing block io actions" 49 depends on SYSFS 50 select RELAY 51 select DEBUG_FS 52 select TRACEPOINTS 53 help 54 Say Y here if you want to be able to trace the block layer actions 55 on a given queue. Tracing allows you to see any traffic happening 56 on a block device queue. For more information (and the userspace 57 support tools needed), fetch the blktrace tools from: 58 59 git://git.kernel.dk/blktrace.git 60 61 If unsure, say N. 62 63config BLK_DEV_BSG 64 bool "Block layer SG support v4 (EXPERIMENTAL)" 65 depends on EXPERIMENTAL 66 ---help--- 67 Saying Y here will enable generic SG (SCSI generic) v4 support 68 for any block device. 69 70 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 71 can handle complicated SCSI commands: tagged variable length cdbs 72 with bidirectional data transfers and generic request/response 73 protocols (e.g. Task Management Functions and SMP in Serial 74 Attached SCSI). 75 76 If unsure, say N. 77 78config BLK_DEV_INTEGRITY 79 bool "Block layer data integrity support" 80 ---help--- 81 Some storage devices allow extra information to be 82 stored/retrieved to help protect the data. The block layer 83 data integrity option provides hooks which can be used by 84 filesystems to ensure better data integrity. 85 86 Say yes here if you have a storage device that provides the 87 T10/SCSI Data Integrity Field or the T13/ATA External Path 88 Protection. If in doubt, say N. 89 90endif # BLOCK 91 92config BLOCK_COMPAT 93 bool 94 depends on BLOCK && COMPAT 95 default y 96 97source block/Kconfig.iosched 98