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    Subjectmmap/MAP_SHARED and mandatory flock
    Date
    It seems to me that the mmap/MAP_SHARED locks_verify_locked() check
    and fcntl_setlk() have no synchronization. For example, a process
    invoking fcntl_setlk on a IS_MANDLOCK inode can check that it has
    no i_mmap vma list, then go on and sleep later before queueing a
    file_lock on the inode i_flock. Subsequently, an mmaper can come
    in, invoke locks_verify_locked(), see no file_lock on the inode
    i_flock, and succeed. The file locker can then wake up and also
    return success.

    Am I missing some synchronization lock/algorithm?

    Kanoj
    kanoj@engr.sgi.com

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