target: Add force_pr_aptpl device attribute

This patch adds a force_pr_aptpl device attribute used to force SPC-3 PR
Activate Persistence across Target Power Loss (APTPL) operation.  This
makes PR metadata write-out occur during state change regardless if new
PERSISTENT_RESERVE_OUT CDBs have their APTPL feature bit set.

This is useful during H/A failover in active/passive setups where all PR
state is being re-created on a different node, driven by configfs backend
device + export layout and pre-loaded $DEV/pr/res_aptpl_metadata.

Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index b106240d8385..23c518a0340c 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -108,6 +108,8 @@
 #define DA_EMULATE_ALUA                         0
 /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
 #define DA_ENFORCE_PR_ISIDS                     1
+/* Force SPC-3 PR Activate Persistence across Target Power Loss */
+#define DA_FORCE_PR_APTPL                       0
 #define DA_STATUS_MAX_SECTORS_MIN               16
 #define DA_STATUS_MAX_SECTORS_MAX               8192
 /* By default don't report non-rotating (solid state) medium */
@@ -680,6 +682,7 @@ struct se_dev_attrib {
         enum target_prot_type pi_prot_type;
         enum target_prot_type hw_pi_prot_type;
         int             enforce_pr_isids;
+        int             force_pr_aptpl;
         int             is_nonrot;
         int             emulate_rest_reord;
         u32             hw_block_size;