bsg: Kconfig updates
- add the detailed explanation.
- remove 'default y'.
- make 'EXPERIMENTAL' keyword visible to the user in menu.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/Kconfig b/block/Kconfig
index 6597b60..0768741 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -52,11 +52,16 @@
endif # BLOCK
config BLK_DEV_BSG
- bool "Block layer SG support"
+ bool "Block layer SG support v4 (EXPERIMENTAL)"
depends on (SCSI=y) && EXPERIMENTAL
- default y
---help---
- Saying Y here will enable generic SG (SCSI generic) v4
- support for any block device.
+ 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).
source block/Kconfig.iosched