filer: keep the remote check for an exclusive create in a transaction

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

weed/filer/filer.go

@@ -525,10 +525,10 @@ func (f *Filer) CreateEntry(ctx context.Context, entry *Entry, existing *Entry,
 	if oldEntry == nil {
 		var findErr error
 		// A lazy fetch here would persist outside the transaction and wait on
-		// the lock it holds for a target it just deleted; the create writes
-		// the path either way.
+		// the lock it holds for a target it just deleted; a non-exclusive
+		// create writes the path either way.
 		findCtx := ctx
-		if ctx.Value(storeTransactionKey{}) != nil {
+		if ctx.Value(storeTransactionKey{}) != nil && !o_excl {
 			findCtx = context.WithValue(ctx, lazyFetchContextKey{}, true)
 		}
 		oldEntry, findErr = f.FindEntry(findCtx, entry.FullPath)

weed/filer/filer_lazy_remote_test.go

@@ -763,6 +763,11 @@ func TestCreateEntry_SkipsTheLazyFetchInsideAStoreTransaction(t *testing.T) {
 	require.NotNil(t, entry)
 	assert.True(t, entry.IsInRemoteOnly())
 	assert.NotZero(t, countingStub.statCalls)
+
+	// an exclusive create inside the transaction still sees the remote object
+	excl := &Entry{FullPath: "/buckets/mybucket/dir/c.txt", Attr: Attr{Mode: 0644, Mtime: time.Now(), Crtime: time.Now()}}
+	err = f.CreateEntry(txCtx, excl, nil, true, false, nil, false, f.MaxFilenameLength)
+	assert.ErrorIs(t, err, filer_pb.ErrEntryAlreadyExists)
 }
 
 func TestMaybeLazyFetchFromRemote_GuardedClientRejectsEndpoint(t *testing.T) {