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pNFS/NFSv4: Improve rejection of out-of-order layouts
[ Upstream commit d29b468 ] If a layoutget ends up being reordered w.r.t. a layoutreturn, e.g. due to a layoutget-on-open not knowing a priori which file to lock, then we must assume the layout is no longer being considered valid state by the server. Incrementally improve our ability to reject such states by using the cached old stateid in conjunction with the plh_barrier to try to identify them. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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