cifs: add server param

As we get down to the transport layer, plenty of functions are passed
the session pointer and assume the transport to use is ses->server.

Instead we modify those functions to pass (ses, server) so that we
can decouple the session from the server.

Signed-off-by: Aurelien Aptel <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/cifs/cifsglob.h

···
 	bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 	/* setup request: allocate mid, sign message */
 	struct mid_q_entry *(*setup_request)(struct cifs_ses *,
-						struct smb_rqst *);
+					     struct TCP_Server_Info *,
+					     struct smb_rqst *);
 	/* setup async request: allocate mid, sign message */
 	struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
 						struct smb_rqst *);

fs/cifs/cifsproto.h

···
 extern int SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
 			    char *in_buf, int flags);
 extern struct mid_q_entry *cifs_setup_request(struct cifs_ses *,
+				struct TCP_Server_Info *,
 				struct smb_rqst *);
 extern struct mid_q_entry *cifs_setup_async_request(struct TCP_Server_Info *,
 						struct smb_rqst *);

fs/cifs/smb2proto.h

···
 extern int smb2_check_receive(struct mid_q_entry *mid,
 			      struct TCP_Server_Info *server, bool log_error);
 extern struct mid_q_entry *smb2_setup_request(struct cifs_ses *ses,
-			      struct smb_rqst *rqst);
+					      struct TCP_Server_Info *,
+					      struct smb_rqst *rqst);
 extern struct mid_q_entry *smb2_setup_async_request(
 			struct TCP_Server_Info *server, struct smb_rqst *rqst);
 extern struct cifs_ses *smb2_find_smb_ses(struct TCP_Server_Info *server,

fs/cifs/smb2transport.c

···
 }
 
 static int
-smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
-		   struct mid_q_entry **mid)
+smb2_get_mid_entry(struct cifs_ses *ses, struct TCP_Server_Info *server,
+		   struct smb2_sync_hdr *shdr, struct mid_q_entry **mid)
 {
-	if (ses->server->tcpStatus == CifsExiting)
+	if (server->tcpStatus == CifsExiting)
 		return -ENOENT;
 
-	if (ses->server->tcpStatus == CifsNeedReconnect) {
+	if (server->tcpStatus == CifsNeedReconnect) {
 		cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
 		return -EAGAIN;
 	}
 
-	if (ses->server->tcpStatus == CifsNeedNegotiate &&
+	if (server->tcpStatus == CifsNeedNegotiate &&
 	   shdr->Command != SMB2_NEGOTIATE)
 		return -EAGAIN;
 
···
 		/* else ok - we are shutting down the session */
 	}
 
-	*mid = smb2_mid_entry_alloc(shdr, ses->server);
+	*mid = smb2_mid_entry_alloc(shdr, server);
 	if (*mid == NULL)
 		return -ENOMEM;
 	spin_lock(&GlobalMid_Lock);
-	list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
+	list_add_tail(&(*mid)->qhead, &server->pending_mid_q);
 	spin_unlock(&GlobalMid_Lock);
 
 	return 0;
···
 }
 
 struct mid_q_entry *
-smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
+smb2_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *server,
+		   struct smb_rqst *rqst)
 {
 	int rc;
 	struct smb2_sync_hdr *shdr =
 			(struct smb2_sync_hdr *)rqst->rq_iov[0].iov_base;
 	struct mid_q_entry *mid;
 
-	smb2_seq_num_into_buf(ses->server, shdr);
+	smb2_seq_num_into_buf(server, shdr);
 
-	rc = smb2_get_mid_entry(ses, shdr, &mid);
+	rc = smb2_get_mid_entry(ses, server, shdr, &mid);
 	if (rc) {
-		revert_current_mid_from_hdr(ses->server, shdr);
+		revert_current_mid_from_hdr(server, shdr);
 		return ERR_PTR(rc);
 	}
 
-	rc = smb2_sign_rqst(rqst, ses->server);
+	rc = smb2_sign_rqst(rqst, server);
 	if (rc) {
-		revert_current_mid_from_hdr(ses->server, shdr);
+		revert_current_mid_from_hdr(server, shdr);
 		cifs_delete_mid(mid);
 		return ERR_PTR(rc);
 	}

fs/cifs/transport.c

···
 }
 
 struct mid_q_entry *
-cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
+cifs_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *ignored,
+		   struct smb_rqst *rqst)
 {
 	int rc;
 	struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
···
 	}
 
 	for (i = 0; i < num_rqst; i++) {
-		midQ[i] = server->ops->setup_request(ses, &rqst[i]);
+		midQ[i] = server->ops->setup_request(ses, server, &rqst[i]);
 		if (IS_ERR(midQ[i])) {
 			revert_current_mid(server, i);
 			for (j = 0; j < i; j++)