9aa04c0151
fixed the issues with file descriptor locks, but the same problems are present for vnode lock/user map lock. If the nfs_asyncio() cannot find the free nfsiod, schedule task to create new nfsiod and return error. This causes fall back to the synchronous i/o for nfs_strategy(), or does not start read at all in the case of readahead. The caller that holds vnode and potentially user map lock does not wait for kproc_create() to finish, preventing the LORs. The change effectively reverts r203072, because we never hand off the request to newly created nfsiod thread anymore. Reviewed by: jhb Tested by: jhb, pluknet MFC after: 3 weeks
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