cifs: Simplify SMB2_open_init()

Reduce code duplication by stitching together create contexts in one
place.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: vlendec

fs/cifs/smb2pdu.c

@@ -2835,42 +2835,20 @@ SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
 	}
 
 	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
-		/* need to set Next field of lease context if we request it */
-		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
-			struct create_context *ccontext =
-			    (struct create_context *)iov[n_iov-1].iov_base;
-			ccontext->Next =
-				cpu_to_le32(server->vals->create_lease_size);
-		}
-
 		rc = add_durable_context(iov, &n_iov, oparms,
 					tcon->use_persistent);
 		if (rc)
 			return rc;
 	}
 
 	if (tcon->posix_extensions) {
-		if (n_iov > 2) {
-			struct create_context *ccontext =
-			    (struct create_context *)iov[n_iov-1].iov_base;
-			ccontext->Next =
-				cpu_to_le32(iov[n_iov-1].iov_len);
-		}
-
 		rc = add_posix_context(iov, &n_iov, oparms->mode);
 		if (rc)
 			return rc;
 	}
 
 	if (tcon->snapshot_time) {
 		cifs_dbg(FYI, "adding snapshot context\n");
-		if (n_iov > 2) {
-			struct create_context *ccontext =
-			    (struct create_context *)iov[n_iov-1].iov_base;
-			ccontext->Next =
-				cpu_to_le32(iov[n_iov-1].iov_len);
-		}
-
 		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
 		if (rc)
 			return rc;
@@ -2894,24 +2872,13 @@ SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
 			set_owner = false;
 
 		if (set_owner | set_mode) {
-			if (n_iov > 2) {
-				struct create_context *ccontext =
-				    (struct create_context *)iov[n_iov-1].iov_base;
-				ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
-			}
-
 			cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
 			rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
 			if (rc)
 				return rc;
 		}
 	}
 
-	if (n_iov > 2) {
-		struct create_context *ccontext =
-			(struct create_context *)iov[n_iov-1].iov_base;
-		ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
-	}
 	add_query_id_context(iov, &n_iov);
 
 	if (n_iov > 2) {
@@ -2922,6 +2889,15 @@ SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
 		req->CreateContextsOffset = cpu_to_le32(
 			sizeof(struct smb2_create_req) +
 			iov[1].iov_len);
+
+		for (unsigned int i = 2; i < (n_iov-1); i++) {
+			struct kvec *v = &iov[i];
+			size_t len = v->iov_len;
+			struct create_context *cctx =
+				(struct create_context *)v->iov_base;
+
+			cctx->Next = cpu_to_le32(len);
+		}
 	}
 
 	rqst->rq_nvec = n_iov;