diff options
| author | Damien Le Moal <damien.lemoal@wdc.com> | 2019-09-05 11:51:29 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-09-06 03:52:33 +0200 |
| commit | 61db437d1cc16c470cf6fccc04d34be9cf6e4e4b (patch) | |
| tree | 98f49d8341df1c9f1d3901ca5aaf43e2f373fa9e /block/elevator.c | |
| parent | lightnvm: print error when target is not found (diff) | |
| download | linux-61db437d1cc16c470cf6fccc04d34be9cf6e4e4b.tar.xz linux-61db437d1cc16c470cf6fccc04d34be9cf6e4e4b.zip | |
block: Cleanup elevator_init_mq() use
Instead of checking a queue tag_set BLK_MQ_F_NO_SCHED flag before
calling elevator_init_mq() to make sure that the queue supports IO
scheduling, use the elevator.c function elv_support_iosched() in
elevator_init_mq(). This does not introduce any functional change but
ensure that elevator_init_mq() does the right thing based on the queue
settings.
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
| -rw-r--r-- | block/elevator.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/block/elevator.c b/block/elevator.c index 86100de88883..4721834815bb 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -619,16 +619,26 @@ out: return ret; } +static inline bool elv_support_iosched(struct request_queue *q) +{ + if (q->tag_set && (q->tag_set->flags & BLK_MQ_F_NO_SCHED)) + return false; + return true; +} + /* - * For blk-mq devices, we default to using mq-deadline, if available, for single - * queue devices. If deadline isn't available OR we have multiple queues, - * default to "none". + * For blk-mq devices supporting IO scheduling, we default to using mq-deadline, + * if available, for single queue devices. If deadline isn't available OR we + * have multiple queues, default to "none". */ int elevator_init_mq(struct request_queue *q) { struct elevator_type *e; int err = 0; + if (!elv_support_iosched(q)) + return 0; + if (q->nr_hw_queues != 1) return 0; @@ -706,13 +716,6 @@ static int __elevator_change(struct request_queue *q, const char *name) return elevator_switch(q, e); } -static inline bool elv_support_iosched(struct request_queue *q) -{ - if (q->tag_set && (q->tag_set->flags & BLK_MQ_F_NO_SCHED)) - return false; - return true; -} - ssize_t elv_iosched_store(struct request_queue *q, const char *name, size_t count) { |