nfsd: avoid permission checks on EXCLUSIVE_CREATE replay
With NFSv4, if we create a file then open it we explicit avoid checking the permissions on the file during the open because the fact that we created it ensures we should be allow to open it (the create and the open should appear to be a single operation). However if the reply to an EXCLUSIVE create gets lots and the client resends the create, the current code will perform the permission check - because it doesn't realise that it did the open already.. This patch should fix this. Note that I haven't actually seen this cause a problem. I was just looking at the code trying to figure out a different EXCLUSIVE open related issue, and this looked wrong. (Fix confirmed with pynfs 4.0 test OPEN4--bfields) Cc: stable@kernel.org Signed-off-by: NNeilBrown <neilb@suse.de> [bfields: use OWNER_OVERRIDE and update for 4.1] Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
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