Re: block: correctly fallback for zeroout

[Martin K. Petersen]

>>>>> "Christoph" == Christoph Hellwig <hch@xxxxxxxxxxxxx> writes:

>> Userland apps rely on EOPNOTSUPP, we can't break that.

Christoph> Rely on what exactly?  Current we return EOPNOTSUPP if the
Christoph> device doesn't claim to support discards, but it returns 0 if
Christoph> the device first claims to support it but then fails the I/O.

Hopefully we can clean up this when/if we go the fallocate() route.

-- 
Martin K. Petersen	Oracle Linux Engineering