block: Make q_usage_counter also track legacy requests
authorMing Lei <ming.lei@redhat.com>
Thu, 9 Nov 2017 18:49:53 +0000 (10:49 -0800)
committerJens Axboe <axboe@kernel.dk>
Sat, 11 Nov 2017 02:53:25 +0000 (19:53 -0700)
commit055f6e18e08f5b7fd98171fce857a0bad87a919d
tree9885288a924bc3655586455a119ac355588c4eb6
parenteb619fdb2d4cb8b3d3419e9113921e87e7daf557
block: Make q_usage_counter also track legacy requests

This patch makes it possible to pause request allocation for
the legacy block layer by calling blk_mq_freeze_queue() and
blk_mq_unfreeze_queue().

Signed-off-by: Ming Lei <ming.lei@redhat.com>
[ bvanassche: Combined two patches into one, edited a comment and made sure
  REQ_NOWAIT is handled properly in blk_old_get_request() ]
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Martin Steigerwald <martin@lichtvoll.de>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/blk-core.c
block/blk-mq.c