Re: [PATCH] fs: Return EOPNOTSUPP if block layer does not support REQ_NOWAIT

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On 12/18/18 1:55 PM, Goldwyn Rodrigues wrote:
On  9:38 17/12, Christoph Hellwig wrote:
On Sun, Dec 16, 2018 at 12:45:19PM +0200, Avi Kivity wrote:
I did see this on XFS too. The whole thing bothers me, it doesn't happen
consistently in some setups, which I don't understand. Either it should
trigger always or never.
Well, if it also happens in XFS the above change isn't going to fix
it alone, there must be another issue hiding in addition to the error
conversion problems.
Are you using multi-device setup as your block device? That could make
it return EOPNOTSUPP since we never got to a point where we could
merge code which supported bio based devices.


Yes, an lvm linear device on top of a single SATA SSD.




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