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    Subject[patch 18/33] nfsd: only set file_lock.fl_lmops in nfsd4_lockt if a stateowner is found
    2.6.28-stable review patch.  If anyone has any objections, please let us know.


    From: Jeff Layton <>

    commit fa82a491275a613b15489aab4b99acecb00958d3 upstream.

    nfsd4_lockt does a search for a lockstateowner when building the lock
    struct to test. If one is found, it'll set fl_owner to it. Regardless of
    whether that happens, it'll also set fl_lmops. Given that this lock is
    basically a "lightweight" lock that's just used for checking conflicts,
    setting fl_lmops is probably not appropriate for it.

    This behavior exposed a bug in DLM's GETLK implementation where it
    wasn't clearing out the fields in the file_lock before filling in
    conflicting lock info. While we were able to fix this in DLM, it
    still seems pointless and dangerous to set the fl_lmops this way
    when we may have a NULL lockstateowner.

    Signed-off-by: Jeff Layton <>
    Signed-off-by: J. Bruce Fields <>
    Signed-off-by: Greg Kroah-Hartman <>

    fs/nfsd/nfs4state.c | 1 -
    1 file changed, 1 deletion(-)

    --- a/fs/nfsd/nfs4state.c
    +++ b/fs/nfsd/nfs4state.c
    @@ -2824,7 +2824,6 @@ nfsd4_lockt(struct svc_rqst *rqstp, stru
    file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
    file_lock.fl_pid = current->tgid;
    file_lock.fl_flags = FL_POSIX;
    - file_lock.fl_lmops = &nfsd_posix_mng_ops;

    file_lock.fl_start = lockt->lt_offset;
    if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))

     \ /
      Last update: 2009-02-04 19:47    [W:0.019 / U:61.132 seconds]
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