When using an XrdOfs plugin, the file open call will be handed to the plugin Open function.
In case validation fails, the plugin should return a status code (e.g: SFS_ERROR), with more details in the XrdOucErrInfo error object.

For the following code (XrdXRootdXeq.cc::1393):

// Open the file
//
   if ((rc = fp->open(fn, (XrdSfsFileOpenMode)openopts,
                     (mode_t)mode, CRED, opaque)))
      {rc = fsError(rc, opC, fp->error, fn, opaque); return rc;}

Providing a status != 0 will trigger parsing of the error object.
The errno from the error object is translated in the XProtocol::mapError() function.
However, for EINVAL, it defaults to kXR_FSError, which is a retryable error.

The complementary XProtocol::toErrno() function provides a mapping between kXR_ArgInvalid/kXR_ArgMissing to EINVAL.

There's no benefit in retrying an EINVAL error from the open call.
Would be useful to have a mapping between EINVAL to a kXR_ error code.

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