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#
# Block layer core configuration
#
menuconfig BLOCK
bool "Enable the block layer" if EMBEDDED
default y
help
Provide block layer support for the kernel.
Disable this option to remove the block layer support from the
kernel. This may be useful for embedded devices.
If this option is disabled:
- block device files will become unusable
- some filesystems (such as ext3) will become unavailable.
Also, SCSI character devices and USB storage will be disabled since
they make use of various block layer definitions and facilities.
Say Y here unless you know you really don't want to mount disks and
suchlike.
if BLOCK
config LBD
bool "Support for Large Block Devices"
depends on !64BIT
help
Enable block devices of size 2TB and larger.
This option is required to support the full capacity of large
(2TB+) block devices, including RAID, disk, Network Block Device,
Logical Volume Manager (LVM) and loopback.
For example, RAID devices are frequently bigger than the capacity
of the largest individual hard drive.
This option is not required if you have individual disk drives
which total 2TB+ and you are not aggregating the capacity into
a large block device (e.g. using RAID or LVM).
If unsure, say N.
config BLK_DEV_IO_TRACE
bool "Support for tracing block io actions"
depends on SYSFS
select RELAY
select DEBUG_FS
help
Say Y here if you want to be able to trace the block layer actions
on a given queue. Tracing allows you to see any traffic happening
on a block device queue. For more information (and the userspace
support tools needed), fetch the blktrace tools from:
git://git.kernel.dk/blktrace.git
If unsure, say N.
config LSF
bool "Support for Large Single Files"
depends on !64BIT
help
Say Y here if you want to be able to handle very large files (2TB
and larger), otherwise say N.
If unsure, say Y.
config BLK_DEV_BSG
bool "Block layer SG support v4 (EXPERIMENTAL)"
depends on EXPERIMENTAL
---help---
Saying Y here will enable generic SG (SCSI generic) v4 support
for any block device.
Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
can handle complicated SCSI commands: tagged variable length cdbs
with bidirectional data transfers and generic request/response
protocols (e.g. Task Management Functions and SMP in Serial
Attached SCSI).
If unsure, say N.
endif # BLOCK
config BLOCK_COMPAT
bool
depends on BLOCK && COMPAT
default y
source block/Kconfig.iosched
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