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authorChristoph Hellwig <hch@lst.de>2021-10-19 14:25:53 +0200
committerJens Axboe <axboe@kernel.dk>2021-10-19 11:10:09 -0600
commitd92ca9d8348fb12c89eac5928bd651c3a485d7b9 (patch)
tree05d9098b647cd912977e1f87fa297fd9c543ffde /block/blk.h
parentdc5fc361d891e089dfd9c0a975dc78041036b906 (diff)
downloadlinux-d92ca9d8348fb12c89eac5928bd651c3a485d7b9.tar.bz2
blk-mq: don't handle non-flush requests in blk_insert_flush
Return to the normal blk_mq_submit_bio flow if the bio did not end up actually being a flush because the device didn't support it. Note that this is basically impossible to hit without special instrumentation given that submit_bio_checks already clears these flags usually, so we'd need a tight race to actually hit this code path. With this the call to blk_mq_run_hw_queue for the flush requests can be removed given that the actual flush requests are always issued via the requeue workqueue which runs the queue unconditionally. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20211019122553.2467817-1-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk.h')
-rw-r--r--block/blk.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk.h b/block/blk.h
index b9729c12fd62..6a039e6c7d07 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -236,7 +236,7 @@ void __blk_account_io_done(struct request *req, u64 now);
*/
#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
-void blk_insert_flush(struct request *rq);
+bool blk_insert_flush(struct request *rq);
int elevator_switch_mq(struct request_queue *q,
struct elevator_type *new_e);