#
# Block layer core configuration
#
-#XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
-#for instance.
+menuconfig BLOCK
+ bool "Enable the block layer" if EMBEDDED
+ default y
+ help
+ This permits the block layer to be removed from the kernel if it's not
+ needed (on some embedded devices for example). If this option is
+ disabled, then blockdev files will become unusable and some
+ filesystems (such as ext3) will become unavailable.
+
+ This option will also disable SCSI character devices and USB storage
+ 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 X86 || (MIPS && 32BIT) || PPC32 || (S390 && !64BIT) || SUPERH || UML
+ depends on !64BIT
help
Say Y here if you want to attach large (bigger than 2TB) discs to
your machine, or if you want to have a raid or loopback device
config LSF
bool "Support for Large Single Files"
- depends on X86 || (MIPS && 32BIT) || PPC32 || ARCH_S390_31 || SUPERH || UML
- default n
+ depends on !64BIT
help
- When CONFIG_LBD is disabled, say Y here if you want to
- handle large file(bigger than 2TB), otherwise say N.
- When CONFIG_LBD is enabled, Y is set automatically.
+ Say Y here if you want to be able to handle very large files (bigger
+ than 2TB), 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).
+
+endif # BLOCK
+
+config BLOCK_COMPAT
+ bool
+ depends on BLOCK && COMPAT
+ default y
source block/Kconfig.iosched