diff --git a/src/engine/fsutils.h b/src/engine/fsutils.h
--- a/src/engine/fsutils.h
+++ b/src/engine/fsutils.h
@@ -38,14 +38,10 @@
 
 /**
  * Disables filesystem copy-on-write feature on given file or directory.
- * Only works on Linux and does nothing on other platforms.
- *
- * It was tested only with Btrfs but in theory can be called on any FS that
- * supports NOCOW.
+ * Only implemented on Linux and does nothing on other platforms.
  */
 void disableCoW(const QString &path);
 
 }
-
 }
 #endif
diff --git a/src/engine/fsutils.cpp b/src/engine/fsutils.cpp
--- a/src/engine/fsutils.cpp
+++ b/src/engine/fsutils.cpp
@@ -92,14 +92,22 @@
     }
 
     if (ioctl(fd, FS_IOC_GETFLAGS, &flags) == -1) {
-        qWarning() << "ioctl error: failed to get file flags (" << errno << ")";
+        const int errno_ioctl = errno;
+        // ignore ENOTTY, filesystem does not support attrs (and likely neither supports COW)
+        if (errno_ioctl != ENOTTY) {
+            qWarning() << "ioctl error: failed to get file flags (" << errno_ioctl << ")";
+        }
         close(fd);
         return;
     }
     if (!(flags & FS_NOCOW_FL)) {
         flags |= FS_NOCOW_FL;
         if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == -1) {
-            qWarning() << "ioctl error: failed to set file flags (" << errno << ")";
+            const int errno_ioctl = errno;
+            // ignore EOPNOTSUPP, returned on filesystems not supporting COW
+            if (errno_ioctl != EOPNOTSUPP) {
+                qWarning() << "ioctl error: failed to set file flags (" << errno_ioctl << ")";
+            }
             close(fd);
             return;
         }