[dm-devel] [PATCH 2/2] dm: Add feature flag to control call to blk_abort_queue

[Mike Anderson]

Add feature flag for no_abort_q.

Signed-off-by: Mike Anderson <andmike at linux.vnet.ibm.com>
---
 drivers/md/dm-mpath.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 4200d03..e55cb41 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -119,6 +119,10 @@ static void trigger_event(struct work_struct *work);
 static void activate_path(struct work_struct *work);
 static void deactivate_path(struct work_struct *work);
 
+enum multipath_feature_flags {
+	MP_FEATURE_NO_ABORT_Q = 0,
+};
+
 static int multipath_test_feature(struct multipath *m, unsigned feature)
 {
 	return test_bit(feature, &m->features);
@@ -156,7 +160,8 @@ static void deactivate_path(struct work_struct *work)
 	struct pgpath *pgpath =
 		container_of(work, struct pgpath, deactivate_path);
 
-	blk_abort_queue(pgpath->path.dev->bdev->bd_disk->queue);
+	if (!multipath_test_feature(pgpath->pg->m, MP_FEATURE_NO_ABORT_Q))
+		blk_abort_queue(pgpath->path.dev->bdev->bd_disk->queue);
 }
 
 static struct priority_group *alloc_priority_group(void)
@@ -822,6 +827,11 @@ static int parse_features(struct arg_set *as, struct multipath *m)
 			continue;
 		}
 
+		if (!strnicmp(param_name, MESG_STR("no_abort_q"))) {
+			multipath_set_feature(m, MP_FEATURE_NO_ABORT_Q);
+			continue;
+		}
+
 		if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
 		    (argc >= 1)) {
 			r = read_param(_params + 1, shift(as),
@@ -1381,11 +1391,14 @@ static int multipath_status(struct dm_target *ti, status_type_t type,
 		DMEMIT("2 %u %u ", m->queue_size, m->pg_init_count);
 	else {
 		DMEMIT("%u ", m->queue_if_no_path +
-			      (m->pg_init_retries > 0) * 2);
+			      (m->pg_init_retries > 0) * 2 +
+			      multipath_test_feature(m, MP_FEATURE_NO_ABORT_Q));
 		if (m->queue_if_no_path)
 			DMEMIT("queue_if_no_path ");
 		if (m->pg_init_retries)
 			DMEMIT("pg_init_retries %u ", m->pg_init_retries);
+		if (multipath_test_feature(m, MP_FEATURE_NO_ABORT_Q))
+			DMEMIT("no_abort_q ");
 	}
 
 	if (!m->hw_handler_name || type == STATUSTYPE_INFO)
-- 
1.6.6.1