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    [PATCH] knfsd: nfsd: don't drop silently on upcall deferral · e0bb89ef
    J.Bruce Fields 提交于
    To avoid tying up server threads when nfsd makes an upcall (to mountd, to get
    export options, to idmapd, for nfsv4 name<->id mapping, etc.), we temporarily
    "drop" the request and save enough information so that we can revisit it
    later.
    
    Certain failures during the deferral process can cause us to really drop the
    request and never revisit it.
    
    This is often less than ideal, and is unacceptable in the NFSv4 case--rfc 3530
    forbids the server from dropping a request without also closing the
    connection.
    
    As a first step, we modify the deferral code to return -ETIMEDOUT (which is
    translated to nfserr_jukebox in the v3 and v4 cases, and remains a drop in the
    v2 case).
    Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
    Signed-off-by: NNeil Brown <neilb@suse.de>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    e0bb89ef
vfs.c 46.9 KB