add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/scsi/storvsc_drv.c
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@@ -1014,6 +1014,22 @@
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 			}
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 			/*
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+			 * Check for "Operating parameters have changed"
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+			 * due to Hyper-V changing the VHD/VHDX BlockSize
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+			 * when adding/removing a differencing disk. This
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+			 * causes discard_granularity to change, so do a
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+			 * rescan to pick up the new granularity. We don't
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+			 * want scsi_report_sense() to output a message
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+			 * that a sysadmin wouldn't know what to do with.
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+			 */
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+			if ((asc == 0x3f) && (ascq != 0x03) &&
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+					(ascq != 0x0e)) {
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+				process_err_fn = storvsc_device_scan;
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+				set_host_byte(scmnd, DID_REQUEUE);
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+				goto do_work;
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+			}
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+
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+			/*
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 			 * Otherwise, let upper layer deal with the
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 			 * error when sense message is present
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 			 */
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@@ -1521,6 +1537,8 @@
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 {
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 	blk_queue_rq_timeout(sdevice->request_queue, (storvsc_timeout * HZ));
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+	/* storvsc devices don't support MAINTENANCE_IN SCSI cmd */
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+	sdevice->no_report_opcodes = 1;
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 	sdevice->no_write_same = 1;
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 	/*
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@@ -1625,10 +1643,6 @@
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  */
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 static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
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 {
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-#if IS_ENABLED(CONFIG_SCSI_FC_ATTRS)
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-	if (scmnd->device->host->transportt == fc_transport_template)
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-		return fc_eh_timed_out(scmnd);
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-#endif
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 	return BLK_EH_RESET_TIMER;
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 }
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..
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@@ -1740,7 +1754,7 @@
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 	length = scsi_bufflen(scmnd);
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 	payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
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-	payload_sz = sizeof(cmd_request->mpb);
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+	payload_sz = 0;
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 	if (sg_count) {
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 		unsigned int hvpgoff = 0;
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@@ -1748,10 +1762,10 @@
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 		unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);
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 		u64 hvpfn;
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-		if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
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+		payload_sz = (hvpg_count * sizeof(u64) +
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+			      sizeof(struct vmbus_packet_mpb_array));
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-			payload_sz = (hvpg_count * sizeof(u64) +
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-				      sizeof(struct vmbus_packet_mpb_array));
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+		if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
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 			payload = kzalloc(payload_sz, GFP_ATOMIC);
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 			if (!payload)
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 				return SCSI_MLQUEUE_DEVICE_BUSY;