2 # Block layer core configuration
5 bool "Enable the block layer" if EMBEDDED
8 Provide block layer support for the kernel.
10 Disable this option to remove the block layer support from the
11 kernel. This may be useful for embedded devices.
13 If this option is disabled:
15 - block device files will become unusable
16 - some filesystems (such as ext3) will become unavailable.
18 Also, SCSI character devices and USB storage will be disabled since
19 they make use of various block layer definitions and facilities.
21 Say Y here unless you know you really don't want to mount disks and
27 bool "Support for Large Block Devices"
30 Enable block devices of size 2TB and larger.
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.
36 For example, RAID devices are frequently bigger than the capacity
37 of the largest individual hard drive.
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).
45 config BLK_DEV_IO_TRACE
46 bool "Support for tracing block io actions"
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:
56 git://git.kernel.dk/blktrace.git
61 bool "Support for Large Single Files"
64 Say Y here if you want to be able to handle very large files (2TB
65 and larger), otherwise say N.
70 bool "Block layer SG support v4 (EXPERIMENTAL)"
71 depends on EXPERIMENTAL
73 Saying Y here will enable generic SG (SCSI generic) v4 support
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
84 config BLK_DEV_INTEGRITY
85 bool "Block layer data integrity support"
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.
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.
100 depends on BLOCK && COMPAT
103 source block/Kconfig.iosched