From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konstantin Khlebnikov Subject: [PATCH RFC 0/3] block: allow REQ_NOWAIT to some bio-based/stacked devices Date: Mon, 01 Jun 2020 15:37:01 +0300 Message-ID: <159101473169.180989.12175693728191972447.stgit@buzz> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, Jens Axboe Cc: Christoph Hellwig List-Id: linux-raid.ids Here is pretty straight forward attempt of handling REQ_NOWAIT for bio-based and stacked devices. They are marked with flag queue->limits.nowait_requests which tells that queue method make_request() handles REQ_NOWAIT or doesn't delay requests, and all backend devices do the same. As a example second/third patches add support into md-raid0 and dm-linear. --- Konstantin Khlebnikov (3): block: add flag 'nowait_requests' into queue limits md/raid0: enable REQ_NOWAIT dm: add support for REQ_NOWAIT and enable for target dm-linear drivers/md/dm-linear.c | 5 +++-- drivers/md/dm-table.c | 3 +++ drivers/md/dm.c | 4 +++- drivers/md/raid0.c | 3 +++ include/linux/device-mapper.h | 6 ++++++ 5 files changed, 18 insertions(+), 3 deletions(-) -- Signature