Allowed to suppress error message from failed burn_read_data()

libburn/libburn.h

@@ -1872,7 +1872,9 @@ int burn_random_access_write(struct burn_drive *d, off_t byte_address,
     @param data_size    The amount of data to be read. This does not have to
                         be aligned to any block size.
     @param data_count   The amount of data actually read (interesting on error)
-    @param flag         Bitfield for control purposes: (unused yet, submit 0)
+    @param flag         Bitfield for control purposes:
+                        bit0= - reserved -
+                        bit1= do not submit error message if read error
     @return 1=sucessful , <=0 an error occured
 */
 int burn_read_data(struct burn_drive *d, off_t byte_address,

libburn/mmc.c

@@ -2823,7 +2823,8 @@ int mmc_read_10(struct burn_drive *d, int start,int amount, struct buffer *buf)
 		"SCSI error on read_10(%d,%d): key=%X asc=%2.2Xh ascq=%2.2Xh",
 			start, amount,
 			c.sense[2],c.sense[12],c.sense[13]);
-		libdax_msgs_submit(libdax_messenger, d->global_index,
+		if(!d->silent_on_scsi_error)
+			libdax_msgs_submit(libdax_messenger, d->global_index,
 				0x00020144,
 				LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
 				msg, 0, 0);

libburn/read.c

@@ -293,10 +293,13 @@ int burn_read_data(struct burn_drive *d, off_t byte_address,
                    char data[], off_t data_size, off_t *data_count, int flag)
 {
 	int alignment = 2048, start, upto, chunksize = 1, err, cpy_size, i;
+	int sose_mem = 0;
 	char msg[81], *wpt;
 	struct buffer buf;
 
 	*data_count = 0;
+	sose_mem = d->silent_on_scsi_error;
+
 	if (d->released) {
 		libdax_msgs_submit(libdax_messenger,
 			d->global_index, 0x00020142,
@@ -337,11 +340,19 @@ int burn_read_data(struct burn_drive *d, off_t byte_address,
 			cpy_size = 16 * 2048;
 		} else
 			cpy_size = data_size - *data_count;
+		if (flag & 2)
+			d->silent_on_scsi_error = 1;
 		err = d->read_10(d, start, chunksize, d->buffer);
+		if (flag & 2) 
+			d->silent_on_scsi_error = sose_mem;
 		if (err == BE_CANCELLED) {
 			/* Try to read a smaller part of the chunk */
 			for (i = 0; i < chunksize - 1; i++) {
+				if (flag & 2)
+					d->silent_on_scsi_error = 1;
 				err = d->read_10(d, start + i, 1, d->buffer);
+				if (flag & 2) 
+					d->silent_on_scsi_error = sose_mem;
 				if (err == BE_CANCELLED)
 			break;
 				memcpy(wpt, d->buffer->data, 2048);