filestore loop shutdown: 1. E_CANCELLED code shouldn't be wrapped int…

…o MAKE_FILESTORE_ERROR 2. CompletionQueue should be notified about request cancellation (#1520)

* filestore loop shutdown: 1. E_CANCELLED code shouldn't be wrapped into MAKE_FILESTORE_ERROR 2. CompletionQueue should be notified about request cancellation

* filestore loop shutdown: 1. E_CANCELLED code shouldn't be wrapped into MAKE_FILESTORE_ERROR 2. CompletionQueue should be notified about request cancellation - added missing include

* filestore loop shutdown: 1. E_CANCELLED code shouldn't be wrapped into MAKE_FILESTORE_ERROR 2. CompletionQueue should be notified about request cancellation - added missing include

* filestore loop shutdown: 1. E_CANCELLED code shouldn't be wrapped into MAKE_FILESTORE_ERROR 2. CompletionQueue should be notified about request cancellation - fixed build

cloud/filestore/libs/vfs_fuse/fs.cpp

@@ -1,7 +1,9 @@
 #include "fs.h"
 
 #include "fs_impl.h"
+
 #include <cloud/filestore/libs/vfs/probes.h>
+#include <cloud/storage/core/libs/common/helpers.h>
 
 namespace NCloud::NFileStore::NFuse {
 
@@ -360,12 +362,12 @@ void CancelRequest(
         req,
         static_cast<fuse_cancelation_code>(callContext.CancellationCode));
 
+    ui32 flags = 0;
+    SetProtoFlag(flags, NCloud::NProto::EF_SILENT);
     requestStats.RequestCompleted(
         log,
         callContext,
-        MakeError(
-            MAKE_FILESTORE_ERROR(E_CANCELLED),
-            "Driver is stopping"));
+        MakeError(E_CANCELLED, "Driver is stopping", flags));
 
     const ui64 now = GetCycleCount();
     const auto ts = callContext.CalcRequestTime(now);

cloud/filestore/libs/vfs_fuse/fs_impl.cpp

@@ -226,6 +226,10 @@ void TFileSystem::CancelRequest(TCallContextPtr callContext, fuse_req_t req)
         *RequestStats,
         *callContext,
         req);
+
+    // notifying CompletionQueue about request completion to decrement inflight
+    // request counter and unblock the stopping procedure
+    CompletionQueue->Complete(req, [&] (fuse_req_t) { return 0; });
 }
 
 }   // namespace NCloud::NFileStore::NFuse