Re: [PATCH 6/9] device-mapper snapshot: barriers not supported

[Andrew Morton]

Alasdair G Kergon <agk@xxxxxxxxxx> wrote:
>
> The snapshot and origin targets are incapable of handling barriers and 
>  need to indicate this.
> 
> ...
>   
>  +	if (unlikely(bio_barrier(bio)))
>  +		return -EOPNOTSUPP;
>  +

And what was happening if people _were_ sending such BIOs down?  Did it all
appear to work correctly?  If so, will this change cause
currently-apparently-working setups to stop working?
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