From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B67EC33CB3 for ; Thu, 16 Jan 2020 12:36:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E6EC8206E6 for ; Thu, 16 Jan 2020 12:36:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726752AbgAPMgm (ORCPT ); Thu, 16 Jan 2020 07:36:42 -0500 Received: from relay.sw.ru ([185.231.240.75]:39059 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726151AbgAPMgi (ORCPT ); Thu, 16 Jan 2020 07:36:38 -0500 Received: from dhcp-172-16-24-104.sw.ru ([172.16.24.104] helo=localhost.localdomain) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1is4Nc-0000ya-Th; Thu, 16 Jan 2020 15:36:08 +0300 Subject: [PATCH block v2 3/3] loop: Add support for REQ_NOZERO From: Kirill Tkhai To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, martin.petersen@oracle.com, axboe@kernel.dk, tytso@mit.edu, adilger.kernel@dilger.ca, Chaitanya.Kulkarni@wdc.com, darrick.wong@oracle.com, ming.lei@redhat.com, osandov@fb.com, jthumshirn@suse.de, minwoo.im.dev@gmail.com, damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com, hare@suse.com, tj@kernel.org, ajay.joshi@wdc.com, sagi@grimberg.me, dsterba@suse.com, chaitanya.kulkarni@wdc.com, bvanassche@acm.org, dhowells@redhat.com, asml.silence@gmail.com, ktkhai@virtuozzo.com Date: Thu, 16 Jan 2020 15:36:08 +0300 Message-ID: <157917816871.88675.11513065461322095922.stgit@localhost.localdomain> In-Reply-To: <157917805422.88675.6477661554332322975.stgit@localhost.localdomain> References: <157917805422.88675.6477661554332322975.stgit@localhost.localdomain> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Support for new modifier of REQ_OP_WRITE_ZEROES command. This results in allocation extents in backing file instead of actual blocks zeroing. Signed-off-by: Kirill Tkhai --- drivers/block/loop.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 739b372a5112..f9e5af7b2ee0 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -581,6 +581,15 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, return 0; } +static unsigned int write_zeroes_to_fallocate_mode(unsigned int flags) +{ + if (flags & REQ_NOZERO) + return 0; + if (flags & REQ_NOUNMAP) + return FALLOC_FL_ZERO_RANGE; + return FALLOC_FL_PUNCH_HOLE; +} + static int do_req_filebacked(struct loop_device *lo, struct request *rq) { struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq); @@ -604,9 +613,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq) * write zeroes the range. Otherwise, punch them out. */ return lo_fallocate(lo, rq, pos, - (rq->cmd_flags & REQ_NOUNMAP) ? - FALLOC_FL_ZERO_RANGE : - FALLOC_FL_PUNCH_HOLE); + write_zeroes_to_fallocate_mode(rq->cmd_flags)); case REQ_OP_DISCARD: return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE); case REQ_OP_WRITE: @@ -877,6 +884,7 @@ static void loop_config_discard(struct loop_device *lo) q->limits.discard_alignment = 0; blk_queue_max_discard_sectors(q, 0); blk_queue_max_write_zeroes_sectors(q, 0); + blk_queue_max_allocate_sectors(q, 0); blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q); return; } @@ -886,6 +894,7 @@ static void loop_config_discard(struct loop_device *lo) blk_queue_max_discard_sectors(q, UINT_MAX >> 9); blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9); + blk_queue_max_allocate_sectors(q, UINT_MAX >> 9); blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); }