From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
If there are no queues, bail if REQ_NOWAIT is set instead
of queueing up I/O.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
drivers/md/dm-mpath.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 0e8ab5bb3575..c6572a9967dc 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -543,6 +543,11 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
if ((pgpath && queue_io) ||
(!pgpath && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))) {
+ /* Bail if nowait is set */
+ if (bio->bi_opf & REQ_NOWAIT) {
+ bio_wouldblock_error(bio);
+ return DM_MAPIO_SUBMITTED;
+ }
/* Queue for the daemon to resubmit */
spin_lock_irqsave(&m->lock, flags);
bio_list_add(&m->queued_bios, bio);
--
2.12.3
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