diff --git a/src/fs_attr_linux.icpp b/src/fs_attr_linux.icpp
index 66722fb3..6cac839f 100644
--- a/src/fs_attr_linux.icpp
+++ b/src/fs_attr_linux.icpp
@@ -35,7 +35,13 @@ namespace fs
     get_fs_ioc_flags(const int  fd,
                      int       &flags)
     {
-      return fs::ioctl(fd,FS_IOC_GETFLAGS,(void*)&flags);
+      int rv;
+
+      rv = fs::ioctl(fd,FS_IOC_GETFLAGS,(void*)&flags);
+      if((rv == -1) && (errno == EINVAL))
+        errno = ENOTSUP;
+
+      return rv;
     }
 
     static
@@ -68,7 +74,13 @@ namespace fs
     set_fs_ioc_flags(const int fd,
                      const int flags)
     {
-      return fs::ioctl(fd,FS_IOC_SETFLAGS,(void*)&flags);
+      int rv;
+
+      rv = fs::ioctl(fd,FS_IOC_SETFLAGS,(void*)&flags);
+      if((rv == -1) && (errno == EINVAL))
+        errno = ENOTSUP;
+
+      return rv;
     }
 
     static
diff --git a/src/fs_attr_unsupported.icpp b/src/fs_attr_unsupported.icpp
index 8be00461..63ca83f0 100644
--- a/src/fs_attr_unsupported.icpp
+++ b/src/fs_attr_unsupported.icpp
@@ -26,14 +26,14 @@ namespace fs
     copy(const int fdin,
          const int fdout)
     {
-      return ENOTSUP;
+      return (errno=ENOTSUP,-1);
     }
 
     int
     copy(const std::string &from,
          const std::string &to)
     {
-      return ENOTSUP;
+      return (errno=ENOTSUP,-1);
     }
   }
 }