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nfsd: Replace use of rwsem with errseq_t
The nfsd_file nf_rwsem is currently being used to separate file write and commit instances to ensure that we catch errors and apply them to the correct write/commit. We can improve scalability at the expense of a little accuracy (some extra false positives) by replacing the nf_rwsem with more careful use of the errseq_t mechanism to track errors across the different operations. Signed-off-by: Trond Myklebust <[email protected]> Signed-off-by: Chuck Lever <[email protected]> [ cel: rebased on zero-verifier fix ]
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