block: fix deadline elevator drain for zoned block devices
When the deadline scheduler is used with a zoned block device, writes to a zone will be dispatched one at a time. This causes the warning message: deadline: forced dispatching is broken (nr_sorted=X), please report this to be displayed when switching to another elevator with the legacy I/O path while write requests to a zone are being retained in the scheduler queue. Prevent this message from being displayed when executing elv_drain_elevator() for a zoned block device. __blk_drain_queue() will loop until all writes are dispatched and completed, resulting in the desired elevator queue drain without extensive modifications to the deadline code itself to handle forced-dispatch calls. Signed-off-by:Damien Le Moal <damien.lemoal@wdc.com> Fixes: 8dc8146f ("deadline-iosched: Introduce zone locking support") Cc: stable@vger.kernel.org Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
530ca2c9
Please register or sign in to comment