When we receive a flush command (or "barrier" in DRBD), we currently use a REQ_OP_FLUSH with the REQ_PREFLUSH flag set.
The correct way to submit a flush bio is by using a REQ_OP_WRITE without any data, and set the REQ_PREFLUSH flag.
Since commit b4a6bb3a67aa ("block: add a sanity check for non-write flush/fua bios"), this triggers a warning in the block layer, but this has been broken for quite some time before that.
So use the correct set of flags to actually make the flush happen.
Cc: Christoph Hellwig hch@infradead.org Cc: stable@vger.kernel.org Fixes: f9ff0da56437 ("drbd: allow parallel flushes for multi-volume resources") Reported-by: Thomas Voegtle tv@lio96.de Signed-off-by: Christoph Böhmwalder christoph.boehmwalder@linbit.com Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20230503121937.17232-1-christoph.boehmwalder@linbi... Signed-off-by: Jens Axboe axboe@kernel.dk (cherry picked from commit 3899d94e3831ee07ea6821c032dc297aec80586a) Signed-off-by: Christoph Böhmwalder christoph.boehmwalder@linbit.com --- drivers/block/drbd/drbd_receiver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index cbb6ef719978..d1d6a7af7e78 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -1310,7 +1310,7 @@ static void submit_one_flush(struct drbd_device *device, struct issue_flush_cont bio_set_dev(bio, device->ldev->backing_bdev); bio->bi_private = octx; bio->bi_end_io = one_flush_endio; - bio->bi_opf = REQ_OP_FLUSH | REQ_PREFLUSH; + bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
device->flush_jif = jiffies; set_bit(FLUSH_PENDING, &device->flags);