Re: status of bugzilla #99171 - mdraid broken for O_DIRECT

[Hannes Reinecke <hare@suse.de>]

On 10/16/25 01:09, Roland wrote:
[ .. ]>
> thank you for your feedback.
> 
> i see, things are complicated and O_DIRECT is a very special beast....
> 
> meanwhile, i gave bcachefs a try today , because it looks interesting .
> 
> like zfs, it does not seem to be affected by this problem, at least from 
> my first tests reported at https://bugzilla.kernel.org/show_bug.cgi? 
> id=99171#c26 (i hope this is a valid test for consistency)
> 
> so we have at least a second "software raid" technology besides zfs, 
> which does NOT suffer from the "by design" O_DIRECT breakage.
> 
> that's at least surprising me, as bcachefs is far from production 
> ready,  and i wonder why it just seems to work at this early stage of 
> development.
> 
Hmm. True.

I would suggest bringing up this topic on linux-fsdevel; there is
always a chance that there is a bug somewhere.
At least some explanation would be warranted why bcachefs does not
suffer from this issue.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
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