target/rd: Allow WriteCacheEnabled=1 operation with rd_mcp backends

This patch adds the missing rd_mcp_template->write_cache_emulated=1 bit to
optionally allow WriteCacheEnabled=1 (WCE) to be enabled for the built-in
TCM/rd_mcp backend driver.

Tested on v3.6-rc[0,2] code with loopback+tcm_vhost fabric ports.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index d00bbe33ff8b..58bcc870366f 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -474,6 +474,7 @@ static int rd_parse_cdb(struct se_cmd *cmd)
 static struct se_subsystem_api rd_mcp_template = {
         .name                   = "rd_mcp",
         .transport_type         = TRANSPORT_PLUGIN_VHBA_VDEV,
+        .write_cache_emulated   = 1,
         .attach_hba             = rd_attach_hba,
         .detach_hba             = rd_detach_hba,
         .allocate_virtdevice    = rd_allocate_virtdevice,