From: Goldwyn Rodrigues <rgold...@suse.com>
Add support for bio based dm devices, which exclusively
sets a make_request_fn(). Request based devices are supported
by default.
Signed-off-by: Goldwyn Rodrigues <rgold...@suse.com>
---
drivers/md/dm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2edbcc2d7d3f..aa9c1a5f2966 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1550,6 +1550,8 @@ static blk_qc_t dm_make_request(struct request_queue *q,
struct bio *bio)
if (!(bio->bi_opf & REQ_RAHEAD))
queue_io(md, bio);
+ else if (bio->bi_opf & REQ_NOWAIT)
+ bio_wouldblock_error(bio);
else
bio_io_error(bio);
return BLK_QC_T_NONE;
@@ -2066,6 +2068,7 @@ int dm_setup_md_queue(struct mapped_device *md, struct
dm_table *t)
case DM_TYPE_DAX_BIO_BASED:
dm_init_normal_md_queue(md);
blk_queue_make_request(md->queue, dm_make_request);
+ queue_flag_set_unlocked(QUEUE_FLAG_NOWAIT, md->queue);
/*
* DM handles splitting bios as needed. Free the bio_split
bioset
* since it won't be used (saves 1 process per bio-based DM
device).
--
2.12.3
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