1# 2# Block layer core configuration 3# 4menuconfig BLOCK 5 bool "Enable the block layer" if EXPERT 6 default y 7 select PERCPU_RWSEM 8 help 9 Provide block layer support for the kernel. 10 11 Disable this option to remove the block layer support from the 12 kernel. This may be useful for embedded devices. 13 14 If this option is disabled: 15 16 - block device files will become unusable 17 - some filesystems (such as ext3) will become unavailable. 18 19 Also, SCSI character devices and USB storage will be disabled since 20 they make use of various block layer definitions and facilities. 21 22 Say Y here unless you know you really don't want to mount disks and 23 suchlike. 24 25if BLOCK 26 27config LBDAF 28 bool "Support for large (2TB+) block devices and files" 29 depends on !64BIT 30 default y 31 help 32 Enable block devices or files of size 2TB and larger. 33 34 This option is required to support the full capacity of large 35 (2TB+) block devices, including RAID, disk, Network Block Device, 36 Logical Volume Manager (LVM) and loopback. 37 38 This option also enables support for single files larger than 39 2TB. 40 41 The ext4 filesystem requires that this feature be enabled in 42 order to support filesystems that have the huge_file feature 43 enabled. Otherwise, it will refuse to mount in the read-write 44 mode any filesystems that use the huge_file feature, which is 45 enabled by default by mke2fs.ext4. 46 47 The GFS2 filesystem also requires this feature. 48 49 If unsure, say Y. 50 51config BLK_DEV_BSG 52 bool "Block layer SG support v4" 53 default y 54 help 55 Saying Y here will enable generic SG (SCSI generic) v4 support 56 for any block device. 57 58 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 59 can handle complicated SCSI commands: tagged variable length cdbs 60 with bidirectional data transfers and generic request/response 61 protocols (e.g. Task Management Functions and SMP in Serial 62 Attached SCSI). 63 64 This option is required by recent UDEV versions to properly 65 access device serial numbers, etc. 66 67 If unsure, say Y. 68 69config BLK_DEV_BSGLIB 70 bool "Block layer SG support v4 helper lib" 71 default n 72 select BLK_DEV_BSG 73 help 74 Subsystems will normally enable this if needed. Users will not 75 normally need to manually enable this. 76 77 If unsure, say N. 78 79config BLK_DEV_INTEGRITY 80 bool "Block layer data integrity support" 81 ---help--- 82 Some storage devices allow extra information to be 83 stored/retrieved to help protect the data. The block layer 84 data integrity option provides hooks which can be used by 85 filesystems to ensure better data integrity. 86 87 Say yes here if you have a storage device that provides the 88 T10/SCSI Data Integrity Field or the T13/ATA External Path 89 Protection. If in doubt, say N. 90 91config BLK_DEV_THROTTLING 92 bool "Block layer bio throttling support" 93 depends on BLK_CGROUP=y 94 default n 95 ---help--- 96 Block layer bio throttling support. It can be used to limit 97 the IO rate to a device. IO rate policies are per cgroup and 98 one needs to mount and use blkio cgroup controller for creating 99 cgroups and specifying per device IO rate policies. 100 101 See Documentation/cgroups/blkio-controller.txt for more information. 102 103menu "Partition Types" 104 105source "block/partitions/Kconfig" 106 107endmenu 108 109endif # BLOCK 110 111config BLOCK_COMPAT 112 bool 113 depends on BLOCK && COMPAT 114 default y 115 116source block/Kconfig.iosched 117