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    UBI: add notification API · 0e0ee1cc
    Dmitry Pervushin 提交于
    UBI volume notifications are intended to create the API to get clients
    notified about volume creation/deletion, renaming and re-sizing. A
    client can subscribe to these notifications using 'ubi_volume_register()'
    and cancel the subscription using 'ubi_volume_unregister()'. When UBI
    volumes change, a blocking notifier is called. Clients also can request
    "added" events on all volumes that existed before client subscribed
    to the notifications.
    
    If we use notifications instead of calling functions like 'ubi_gluebi_xxx()',
    we can make the MTD emulation layer to be more flexible: build it as a
    separate module and load/unload it on demand.
    
    [Artem: many cleanups, rework locking, add "updated" event, provide
     device/volume info in notifiers]
    Signed-off-by: NDmitry Pervushin <dpervushin@embeddedalley.com>
    Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
    0e0ee1cc
ubi.h 23.9 KB