diff --git a/scst/src/scst_lib.c b/scst/src/scst_lib.c
index 17722342d..018baeed3 100644
--- a/scst/src/scst_lib.c
+++ b/scst/src/scst_lib.c
@@ -175,7 +175,8 @@ static const struct scst_sdbops scst_scsi_op_table[] = {
 			 SCST_EXCL_ACCESS_ALLOWED,
 	 0, get_trans_len_none},
 	{0x01, " M              ", "REWIND",
-	 SCST_DATA_NONE, SCST_LONG_TIMEOUT, 0, get_trans_len_none},
+	 SCST_DATA_NONE, SCST_LONG_TIMEOUT|SCST_WRITE_EXCL_ALLOWED,
+	 0, get_trans_len_none},
 	{0x01, "O V OO OO       ", "REZERO UNIT",
 	 SCST_DATA_NONE, SCST_WRITE_EXCL_ALLOWED,
 	 0, get_trans_len_none},
@@ -376,7 +377,8 @@ static const struct scst_sdbops scst_scsi_op_table[] = {
 	{0x35, "O   OO O        ", "SYNCHRONIZE CACHE",
 	 SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
 	{0x36, "O   OO O        ", "LOCK UNLOCK CACHE",
-	 SCST_DATA_NONE, FLAG_NONE, 0, get_trans_len_none},
+	 SCST_DATA_NONE, SCST_WRITE_EXCL_ALLOWED,
+	 0, get_trans_len_none},
 	{0x37, "O      O        ", "READ DEFECT DATA(10)",
 	 SCST_DATA_READ, SCST_WRITE_EXCL_ALLOWED,
 	 8, get_trans_len_1},
@@ -533,7 +535,8 @@ static const struct scst_sdbops scst_scsi_op_table[] = {
 	 10, get_trans_len_4},
 	{0x8F, "O   OO O        ", "VERIFY(16)",
 	 SCST_DATA_NONE, SCST_TRANSFER_LEN_TYPE_FIXED|
-			 SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED,
+			 SCST_VERIFY_BYTCHK_MISMATCH_ALLOWED|
+			 SCST_WRITE_EXCL_ALLOWED,
 	 10, get_trans_len_4},
 	{0x90, "O   OO O        ", "PRE-FETCH(16)",
 	 SCST_DATA_NONE, SCST_WRITE_EXCL_ALLOWED,