target: Add MAXIMUM COMPARE AND WRITE LENGTH in Block Limits VPD
This patch adds the MAXIMUM COMPARE AND WRITE LENGTH bit, currently
hardcoded to a single logical block (NoLB=1) within the Block Limits
VPD in spc_emulate_evpd_b0().
Also add emulate_caw device attribute in configfs (enabled by default)
to allow the exposure of this bit to be disabled, if necessary.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 4cb667d..ed7077a 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -457,6 +457,11 @@
/* Set WSNZ to 1 */
buf[4] = 0x01;
+ /*
+ * Set MAXIMUM COMPARE AND WRITE LENGTH
+ */
+ if (dev->dev_attrib.emulate_caw)
+ buf[5] = 0x01;
/*
* Set OPTIMAL TRANSFER LENGTH GRANULARITY