diff --git a/fs/hmdfs/hmdfs_client.c b/fs/hmdfs/hmdfs_client.c
index fa8e7435c1efe38d6de68695b3b16c75f6ef023e..9da73ee38c33252054fc823dece6642a0208b49c 100644
--- a/fs/hmdfs/hmdfs_client.c
+++ b/fs/hmdfs/hmdfs_client.c
@@ -40,6 +40,7 @@ int hmdfs_send_open(struct hmdfs_peer *con, const char *send_buf,
 	struct hmdfs_send_command sm = {
 		.data = open_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 	hmdfs_init_cmd(&sm.operations, F_OPEN);
 
@@ -102,6 +103,7 @@ int hmdfs_send_fsync(struct hmdfs_peer *con, const struct hmdfs_fid *fid,
 	struct hmdfs_send_command sm = {
 		.data = fsync_req,
 		.len = sizeof(struct fsync_request),
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_FSYNC);
@@ -464,6 +466,7 @@ int hmdfs_client_start_mkdir(struct hmdfs_peer *con,
 	struct hmdfs_send_command sm = {
 		.data = mkdir_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_MKDIR);
@@ -511,6 +514,7 @@ int hmdfs_client_start_create(struct hmdfs_peer *con,
 	struct hmdfs_send_command sm = {
 		.data = create_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_CREATE);
@@ -556,6 +560,7 @@ int hmdfs_client_start_rmdir(struct hmdfs_peer *con, const char *path,
 	struct hmdfs_send_command sm = {
 		.data = rmdir_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_RMDIR);
@@ -585,6 +590,7 @@ int hmdfs_client_start_unlink(struct hmdfs_peer *con, const char *path,
 	struct hmdfs_send_command sm = {
 		.data = unlink_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_UNLINK);
@@ -619,6 +625,7 @@ int hmdfs_client_start_rename(struct hmdfs_peer *con, const char *old_path,
 	struct hmdfs_send_command sm = {
 		.data = rename_req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_RENAME);
@@ -714,6 +721,7 @@ int hmdfs_send_getattr(struct hmdfs_peer *con, const char *send_buf,
 	struct hmdfs_send_command sm = {
 		.data = req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_GETATTR);
@@ -768,6 +776,7 @@ int hmdfs_send_statfs(struct hmdfs_peer *con, const char *path,
 	struct hmdfs_send_command sm = {
 		.data = req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_STATFS);
@@ -850,6 +859,7 @@ int hmdfs_send_getxattr(struct hmdfs_peer *con, const char *send_buf,
 	struct hmdfs_send_command sm = {
 		.data = req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_GETXATTR);
@@ -937,6 +947,7 @@ ssize_t hmdfs_send_listxattr(struct hmdfs_peer *con, const char *send_buf,
 	struct hmdfs_send_command sm = {
 		.data = req,
 		.len = send_len,
+		.out_buf = NULL,
 	};
 
 	hmdfs_init_cmd(&sm.operations, F_LISTXATTR);