summaryrefslogtreecommitdiff
path: root/block/blk-mq.c
diff options
context:
space:
mode:
authorGoldwyn Rodrigues <rgoldwyn@suse.com>2017-06-20 07:05:46 -0500
committerJens Axboe <axboe@kernel.dk>2017-06-20 07:12:03 -0600
commit03a07c92a9ed9938d828ca7f1d11b8bc63a7bb89 (patch)
treeaced260faa3cdf56d6f1140579ffaf46f8ba9c25 /block/blk-mq.c
parenta38d1243704f501a4c42de1db1062ff6eba83453 (diff)
block: return on congested block device
A new bio operation flag REQ_NOWAIT is introduced to identify bio's orignating from iocb with IOCB_NOWAIT. This flag indicates to return immediately if a request cannot be made instead of retrying. Stacked devices such as md (the ones with make_request_fn hooks) currently are not supported because it may block for housekeeping. For example, an md can have a part of the device suspended. For this reason, only request based devices are supported. In the future, this feature will be expanded to stacked devices by teaching them how to handle the REQ_NOWAIT flags. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index dd276a9e138e..ca03cd4b263f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -293,6 +293,8 @@ static struct request *blk_mq_get_request(struct request_queue *q,
data->ctx = blk_mq_get_ctx(q);
if (likely(!data->hctx))
data->hctx = blk_mq_map_queue(q, data->ctx->cpu);
+ if (op & REQ_NOWAIT)
+ data->flags |= BLK_MQ_REQ_NOWAIT;
if (e) {
data->flags |= BLK_MQ_REQ_INTERNAL;
@@ -1544,6 +1546,8 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
rq = blk_mq_get_request(q, bio, bio->bi_opf, &data);
if (unlikely(!rq)) {
__wbt_done(q->rq_wb, wb_acct);
+ if (bio->bi_opf & REQ_NOWAIT)
+ bio_wouldblock_error(bio);
return BLK_QC_T_NONE;
}