[dm-devel] [PATCH 6/15] scsi xcopy: suppress error messages

[Mikulas Patocka]

This patch suppresses error messages when copying between two arrays that
support XCOPY each, but that cannot copy data between each other.

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>

---
 drivers/scsi/sd.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: linux-4.4-rc4/drivers/scsi/sd.c
===================================================================
--- linux-4.4-rc4.orig/drivers/scsi/sd.c	2015-12-07 16:58:48.000000000 +0100
+++ linux-4.4-rc4/drivers/scsi/sd.c	2015-12-07 16:59:09.000000000 +0100
@@ -1995,6 +1995,20 @@ static int sd_done(struct scsi_cmnd *SCp
 					req->cmd_flags |= REQ_QUIET;
 				}
 			}
+		} else if (sshdr.asc == 0x26) {
+			switch (op) {
+			/*
+			 * Copying between two arrays that support XCOPY, but
+			 * cannot access each other.
+			 */
+			case EXTENDED_COPY:
+				if ((SCpnt->cmnd[1] & 0x1f) == 0) {
+					good_bytes = 0;
+					req->__data_len = blk_rq_bytes(req);
+					req->cmd_flags |= REQ_QUIET;
+				}
+				break;
+			}
 		}
 		break;
 	default: