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

[Christoph Hellwig]

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);