linux-kernel - Re: [Regression] fstrim hangs on Hyper-V: caused by "block: improve handling of the magic discard payload"

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Date:   Thu, 12 Jan 2017 16:52:41 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Christoph Hellwig <hch@....de>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Jens Axboe <axboe@...com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        "Chris Valean (Cloudbase Solutions SRL)" <v-chvale@...rosoft.com>
Subject: Re: [Regression] fstrim hangs on Hyper-V: caused by "block:
        improve handling of the magic discard payload"

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);