[Devel] [PATCH RHEL7 COMMIT] ms/target/sbc: Add LBPRZ attribute + control CDB emulation

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-693.21.1.vz7.46.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.21.1.vz7.46.2
------>
commit 6670637e00d204e25c3d7b67f022b825d93520e4
Author: Jamie Pocas <jamie.pocas at emc.com>
Date:   Mon Apr 2 17:28:24 2018 +0300

    ms/target/sbc: Add LBPRZ attribute + control CDB emulation
    
    ML: e6f41633cb79b55ead84b023c02035322c7827e7
    
    This change sets the LBPRZ flag in EVPD page b2h and READ CAPACITY (16)
    based on a new unmap_zeroes_data device attribute. This flag is set
    automatically for iblock based on underlying block device queue's
    discard_zeroes_data flag.
    
    Signed-off-by: Jamie Pocas <jamie.pocas at emc.com>
    Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
    Signed-off-by: Andrei Vagin <avagin at openvz.org>
---
 drivers/target/target_core_iblock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index c68e2555edf4..02c5ab0a56e8 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -144,6 +144,8 @@ static int iblock_configure_device(struct se_device *dev)
 				q->limits.discard_granularity >> 9;
 		dev->dev_attrib.unmap_granularity_alignment =
 				q->limits.discard_alignment;
+		dev->dev_attrib.unmap_zeroes_data =
+				q->limits.discard_zeroes_data;
 
 		pr_debug("IBLOCK: BLOCK Discard support available,"
 				" disabled by default\n");