From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751243AbdALPxg (ORCPT ); Thu, 12 Jan 2017 10:53:36 -0500 Received: from verein.lst.de ([213.95.11.211]:46990 "EHLO newverein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750829AbdALPxJ (ORCPT ); Thu, 12 Jan 2017 10:53:09 -0500 Date: Thu, 12 Jan 2017 16:52:41 +0100 From: Christoph Hellwig To: Dexuan Cui Cc: Christoph Hellwig , "linux-block@vger.kernel.org" , Jens Axboe , Vitaly Kuznetsov , "linux-kernel@vger.kernel.org" , KY Srinivasan , "Chris Valean (Cloudbase Solutions SRL)" Subject: Re: [Regression] fstrim hangs on Hyper-V: caused by "block: improve handling of the magic discard payload" Message-ID: <20170112155241.GA18147@lst.de> References: <20170112134412.GB15178@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Can you check if this debug printk triggers for the discard commands? --- diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 888e16e..7ab7d08 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1031,6 +1031,10 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request, data_transfer_length = 0; } + if (cmd_request->payload->range.len != data_transfer_length) + printk_ratelimited("request len: %u, transfer len: %u\n", + cmd_request->payload->range.len, + data_transfer_length); scsi_set_resid(scmnd, cmd_request->payload->range.len - data_transfer_length);