Re: [PATCH 1/2] quota: Add mountpath based quota support

[Christoph Hellwig]

> +	if (!mountpoint)
> +		return -ENODEV;
> +
> +	ret = user_path_at(AT_FDCWD, mountpoint,
> +			     LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &mountpath);

user_path_at handles an empty path, although you'll get EFAULT instead.
Do we care about the -ENODEV here?

Otherwise this looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>