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Date: Thu, 12 Jan 2017 14:44:12 +0100
From: Christoph Hellwig <hch@lst.de>
To: Dexuan Cui <decui@microsoft.com>
Cc: Christoph Hellwig <hch@lst.de>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
        Jens Axboe <axboe@fb.com>, Vitaly Kuznetsov <vkuznets@redhat.com>,
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        KY Srinivasan <kys@microsoft.com>,
        "Chris Valean (Cloudbase Solutions SRL)" <v-chvale@microsoft.com>
Subject: Re: [Regression] fstrim hangs on Hyper-V: caused by "block:
        improve handling of the magic discard payload"
Message-ID: <20170112134412.GB15178@lst.de>
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Hi Dexuan,

sorry for dropping the ball on the previous private report, I hoped
I could get my hands on a Hyper-V VM and reproduce it myself, but
that has obviously not happened.

Can you send me the output of the provisioning_mode file for the
scsi disk in question to get started?