NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0
[ Upstream commit eb2c50da9e256dbbb3ff27694440e4c1900cfef8 ] If the attempt to resend the I/O results in no bytes being read/written, we must ensure that we report the error. Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com> Fixes: 0a00b77b ("nfs: mirroring support for direct io") Cc: stable@vger.kernel.org # v3.20+ Signed-off-by: NSasha Levin <sashal@kernel.org>
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