CIFS: Simplify connection structure search calls

Use separate functions for comparison between existing structure
and what we are requesting for to make server, session and tcon
search code easier to use on next superblock match call.
Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/connect.c

@@ -1642,24 +1642,33 @@ match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
 	return true;
 }
 
-static struct TCP_Server_Info *
-cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
+static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
+			 struct smb_vol *vol)
 {
-	struct TCP_Server_Info *server;
-
-	spin_lock(&cifs_tcp_ses_lock);
-	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 	if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
-			continue;
+		return 0;
 
 	if (!match_address(server, addr,
 			   (struct sockaddr *)&vol->srcaddr))
-			continue;
+		return 0;
 
 	if (!match_port(server, addr))
-			continue;
+		return 0;
 
 	if (!match_security(server, vol))
+		return 0;
+
+	return 1;
+}
+
+static struct TCP_Server_Info *
+cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
+{
+	struct TCP_Server_Info *server;
+
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+		if (!match_server(server, addr, vol))
 			continue;
 
 		++server->srv_count;
@@ -1853,32 +1862,39 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
 	return ERR_PTR(rc);
 }
 
-static struct cifsSesInfo *
-cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
+static int match_session(struct cifsSesInfo *ses, struct smb_vol *vol)
 {
-	struct cifsSesInfo *ses;
-
-	spin_lock(&cifs_tcp_ses_lock);
-	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
-		switch (server->secType) {
+	switch (ses->server->secType) {
 	case Kerberos:
 		if (vol->cred_uid != ses->cred_uid)
-				continue;
+			return 0;
 		break;
 	default:
 		/* anything else takes username/password */
 		if (ses->user_name == NULL)
-				continue;
+			return 0;
 		if (strncmp(ses->user_name, vol->username,
 			    MAX_USERNAME_SIZE))
-				continue;
+			return 0;
 		if (strlen(vol->username) != 0 &&
 		    ses->password != NULL &&
 		    strncmp(ses->password,
 			    vol->password ? vol->password : "",
 			    MAX_PASSWORD_SIZE))
-				continue;
+			return 0;
 	}
+	return 1;
+}
+
+static struct cifsSesInfo *
+cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
+{
+	struct cifsSesInfo *ses;
+
+	spin_lock(&cifs_tcp_ses_lock);
+	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+		if (!match_session(ses, vol))
+			continue;
 		++ses->ses_count;
 		spin_unlock(&cifs_tcp_ses_lock);
 		return ses;
@@ -2021,6 +2037,15 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
 	return ERR_PTR(rc);
 }
 
+static int match_tcon(struct cifsTconInfo *tcon, const char *unc)
+{
+	if (tcon->tidStatus == CifsExiting)
+		return 0;
+	if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
+		return 0;
+	return 1;
+}
+
 static struct cifsTconInfo *
 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
 {
@@ -2030,11 +2055,8 @@ cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
 	spin_lock(&cifs_tcp_ses_lock);
 	list_for_each(tmp, &ses->tcon_list) {
 		tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
-		if (tcon->tidStatus == CifsExiting)
+		if (!match_tcon(tcon, unc))
 			continue;
-		if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
-			continue;
-
 		++tcon->tc_count;
 		spin_unlock(&cifs_tcp_ses_lock);
 		return tcon;