• David Howells's avatar
    FS-Cache: Provide proper invalidation · ef778e7a
    David Howells authored
    Provide a proper invalidation method rather than relying on the netfs retiring
    the cookie it has and getting a new one.  The problem with this is that isn't
    easy for the netfs to make sure that it has completed/cancelled all its
    outstanding storage and retrieval operations on the cookie it is retiring.
    
    Instead, have the cache provide an invalidation method that will cancel or wait
    for all currently outstanding operations before invalidating the cache, and
    will cause new operations to queue up behind that.  Whilst invalidation is in
    progress, some requests will be rejected until the cache can stack a barrier on
    the operation queue to cause new operations to be deferred behind it.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    ef778e7a