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    NLM: Further cancel fixes · 64a318ee
    J. Bruce Fields 提交于
     If the server receives an NLM cancel call and finds no waiting lock to
     cancel, then chances are the lock has already been applied, and the client
     just hadn't yet processed the NLM granted callback before it sent the
     cancel.
    
     The Open Group text, for example, perimts a server to return either success
     (LCK_GRANTED) or failure (LCK_DENIED) in this case.  But returning an error
     seems more helpful; the client may be able to use it to recognize that a
     race has occurred and to recover from the race.
    
     So, modify the relevant functions to return an error in this case.
    Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
    Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
    64a318ee
locks.c 55.1 KB