From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> 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 <rgoldwyn@xxxxxxxx> --- 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 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
