diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 8aae8e28038c..e8140528ca5c 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -57,19 +57,21 @@ cifs_dump_mem(char *label, void *data, int length)
 	}
 }
 
-#ifdef CONFIG_CIFS_DEBUG2
 void cifs_dump_detail(void *buf)
 {
+#ifdef CONFIG_CIFS_DEBUG2
 	struct smb_hdr *smb = (struct smb_hdr *)buf;
 
 	cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d",
 		  smb->Command, smb->Status.CifsError,
 		  smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
 	cERROR(1, "smb buf %p len %d", smb, smbCalcSize(smb));
+#endif /* CONFIG_CIFS_DEBUG2 */
 }
 
 void cifs_dump_mids(struct TCP_Server_Info *server)
 {
+#ifdef CONFIG_CIFS_DEBUG2
 	struct list_head *tmp;
 	struct mid_q_entry *mid_entry;
 
@@ -102,8 +104,8 @@ void cifs_dump_mids(struct TCP_Server_Info *server)
 		}
 	}
 	spin_unlock(&GlobalMid_Lock);
-}
 #endif /* CONFIG_CIFS_DEBUG2 */
+}
 
 #ifdef CONFIG_PROC_FS
 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
diff --git a/fs/cifs/cifs_debug.h b/fs/cifs/cifs_debug.h
index 566e0ae8dc2c..c0c68bb492d7 100644
--- a/fs/cifs/cifs_debug.h
+++ b/fs/cifs/cifs_debug.h
@@ -24,10 +24,10 @@
 #define _H_CIFS_DEBUG
 
 void cifs_dump_mem(char *label, void *data, int length);
-#ifdef CONFIG_CIFS_DEBUG2
-#define DBG2 2
 void cifs_dump_detail(void *);
 void cifs_dump_mids(struct TCP_Server_Info *);
+#ifdef CONFIG_CIFS_DEBUG2
+#define DBG2 2
 #else
 #define DBG2 0
 #endif
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 825140170b1e..1001924f594a 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -175,6 +175,12 @@ struct smb_version_operations {
 	unsigned int (*read_data_length)(char *);
 	/* map smb to linux error */
 	int (*map_error)(char *, bool);
+	/* find mid corresponding to the response message */
+	struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
+	void (*dump_detail)(void *);
+	/* verify the message */
+	int (*check_message)(char *, unsigned int);
+	bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 };
 
 struct smb_version_values {
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 65ec6ef0995e..ce033d74f315 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -783,25 +783,6 @@ is_smb_response(struct TCP_Server_Info *server, unsigned char type)
 	return false;
 }
 
-static struct mid_q_entry *
-find_mid(struct TCP_Server_Info *server, char *buffer)
-{
-	struct smb_hdr *buf = (struct smb_hdr *)buffer;
-	struct mid_q_entry *mid;
-
-	spin_lock(&GlobalMid_Lock);
-	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
-		if (mid->mid == buf->Mid &&
-		    mid->mid_state == MID_REQUEST_SUBMITTED &&
-		    le16_to_cpu(mid->command) == buf->Command) {
-			spin_unlock(&GlobalMid_Lock);
-			return mid;
-		}
-	}
-	spin_unlock(&GlobalMid_Lock);
-	return NULL;
-}
-
 void
 dequeue_mid(struct mid_q_entry *mid, bool malformed)
 {
@@ -986,7 +967,7 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 	 * 48 bytes is enough to display the header and a little bit
 	 * into the payload for debugging purposes.
 	 */
-	length = checkSMB(buf, server->total_read);
+	length = server->ops->check_message(buf, server->total_read);
 	if (length != 0)
 		cifs_dump_mem("Bad SMB: ", buf,
 			min_t(unsigned int, server->total_read, 48));
@@ -1059,7 +1040,7 @@ cifs_demultiplex_thread(void *p)
 			continue;
 		server->total_read += length;
 
-		mid_entry = find_mid(server, buf);
+		mid_entry = server->ops->find_mid(server, buf);
 
 		if (!mid_entry || !mid_entry->receive)
 			length = standard_receive3(server, mid_entry);
@@ -1076,13 +1057,13 @@ cifs_demultiplex_thread(void *p)
 		if (mid_entry != NULL) {
 			if (!mid_entry->multiRsp || mid_entry->multiEnd)
 				mid_entry->callback(mid_entry);
-		} else if (!is_valid_oplock_break(buf, server)) {
+		} else if (!server->ops->is_oplock_break(buf, server)) {
 			cERROR(1, "No task to wake, unknown frame received! "
 				   "NumMids %d", atomic_read(&midCount));
 			cifs_dump_mem("Received Data is: ", buf,
 				      HEADER_SIZE(server));
 #ifdef CONFIG_CIFS_DEBUG2
-			cifs_dump_detail(buf);
+			server->ops->dump_detail(buf);
 			cifs_dump_mids(server);
 #endif /* CIFS_DEBUG2 */
 
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index daa2edec391e..ddc8ca6c3090 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -81,6 +81,25 @@ cifs_read_data_length(char *buf)
 	       le16_to_cpu(rsp->DataLength);
 }
 
+static struct mid_q_entry *
+cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
+{
+	struct smb_hdr *buf = (struct smb_hdr *)buffer;
+	struct mid_q_entry *mid;
+
+	spin_lock(&GlobalMid_Lock);
+	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
+		if (mid->mid == buf->Mid &&
+		    mid->mid_state == MID_REQUEST_SUBMITTED &&
+		    le16_to_cpu(mid->command) == buf->Command) {
+			spin_unlock(&GlobalMid_Lock);
+			return mid;
+		}
+	}
+	spin_unlock(&GlobalMid_Lock);
+	return NULL;
+}
+
 struct smb_version_operations smb1_operations = {
 	.send_cancel = send_nt_cancel,
 	.compare_fids = cifs_compare_fids,
@@ -89,6 +108,10 @@ struct smb_version_operations smb1_operations = {
 	.read_data_offset = cifs_read_data_offset,
 	.read_data_length = cifs_read_data_length,
 	.map_error = map_smb_to_linux_error,
+	.find_mid = cifs_find_mid,
+	.check_message = checkSMB,
+	.dump_detail = cifs_dump_detail,
+	.is_oplock_break = is_valid_oplock_break,
 };
 
 struct smb_version_values smb1_values = {