ovl: warn instead of error if d_type is not supported
overlay needs underlying fs to support d_type. Recently I put in a patch in to detect this condition and started failing mount if underlying fs did not support d_type. But this breaks existing configurations over kernel upgrade. Those who are running docker (partially broken configuration) with xfs not supporting d_type, are surprised that after kernel upgrade docker does not run anymore. https://github.com/docker/docker/issues/22937#issuecomment-229881315 So instead of erroring out, detect broken configuration and warn about it. This should allow existing docker setups to continue working after kernel upgrade. Signed-off-by: NVivek Goyal <vgoyal@redhat.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com> Fixes: 45aebeaf ("ovl: Ensure upper filesystem supports d_type") Cc: <stable@vger.kernel.org> 4.6
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