[Devel] [PATCH RHEL8 COMMIT] dm: Introduce dm_requeue_original_rq()

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-305.3.1.vz8.7.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-305.3.1.vz8.7.11
------>
commit 90efd325a0f4a4a3a717949f85b8cdf84a0adcc4
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Fri Sep 10 20:16:48 2021 +0300

    dm: Introduce dm_requeue_original_rq()
    
    Introduce a helper to requeue request by rq.
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
    
    ====================
    push_backup: Make target !immutable.
    
    https://jira.sw.ru/browse/PSBM-127989
    
    Kirill Tkhai (14):
          push_backup: Rename ppb_map
          push_backup: Add unsigned long alignment
          push_backup: Add pending_map
          push_backup: Kill find_node_pbio_range()
          push_backup: Use nr_delayed in postpone_if_required_for_backup()
          push_backup: Introduce hash table
          push_backup: Leave pending pbio in pending queue
          push_backup: Do not split bios by cluster size
          dm: Allow singleton target with devices attached
          dm: Introduce dm_requeue_original_rq()
          push_backup: Make it request based
          push_backup: Change retval postpone_if_required_for_backup()
          push_backup: Change arguments of calc_bio_clusters()
          push_backup: Make the target !immutable
---
 drivers/md/dm-rq.c | 8 ++++++++
 drivers/md/dm-rq.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 44aec0eb0567..f5adab50de88 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -201,6 +201,14 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_
 	rq_completed(md);
 }
 
+void dm_requeue_original_rq(struct request *rq)
+{
+	struct dm_rq_target_io *tio = tio_from_request(rq);
+
+	dm_requeue_original_request(tio, false);
+}
+EXPORT_SYMBOL(dm_requeue_original_rq);
+
 static void dm_done(struct request *clone, blk_status_t error, bool mapped)
 {
 	int r = DM_ENDIO_DONE;
diff --git a/drivers/md/dm-rq.h b/drivers/md/dm-rq.h
index 56156738d1b4..bf625cbd789c 100644
--- a/drivers/md/dm-rq.h
+++ b/drivers/md/dm-rq.h
@@ -45,5 +45,6 @@ ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
 						     const char *buf, size_t count);
 
 void dm_complete_request(struct request *rq, blk_status_t error);
+void dm_requeue_original_rq(struct request *rq);
 
 #endif