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[9/9] dm-mpath: Add nowait support

Message ID 20171004135511.26110-10-rgoldwyn@suse.de (mailing list archive)
State New, archived
Headers show

Commit Message

Goldwyn Rodrigues Oct. 4, 2017, 1:55 p.m. UTC 
From: Goldwyn Rodrigues <rgoldwyn@suse.com>

If there are no queues, bail if REQ_NOWAIT is set instead
of queueing up I/O.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 drivers/md/dm-mpath.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 11f273d2f018..d714c1b1b066 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -542,6 +542,11 @@  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);