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nfsd: add some comments to nfsd_file_do_acquire
David Howells mentioned that he found this bit of code confusing, so sprinkle in some comments to clarify. Reported-by: David Howells <dhowells@redhat.com> Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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@ -1094,6 +1094,11 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
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rcu_read_unlock();
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if (nf) {
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/*
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* If the nf is on the LRU then it holds an extra reference
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* that must be put if it's removed. It had better not be
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* the last one however, since we should hold another.
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*/
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if (nfsd_file_lru_remove(nf))
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WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref));
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goto wait_for_construction;
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