block: add bsg helper library
This moves the FC classes bsg code to the block layer and
makes it a lib so that other classes like iscsi and SAS can use it.
It is helpful because working with the request queue, bios,
creating scatterlists, etc are a pain that the LLD does not
have to worry about with normal IOs and should not have to
worry about for bsg requests.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/block/Kconfig b/block/Kconfig
index 60be1e0..e97934e 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -65,6 +65,16 @@
If unsure, say Y.
+config BLK_DEV_BSGLIB
+ bool "Block layer SG support v4 helper lib"
+ default n
+ select BLK_DEV_BSG
+ help
+ Subsystems will normally enable this if needed. Users will not
+ normally need to manually enable this.
+
+ If unsure, say N.
+
config BLK_DEV_INTEGRITY
bool "Block layer data integrity support"
---help---