Most requests do not require waiting for inotify to process the
file event before exiting. Rework the NotifySyncLock to make this
optional. Replace the write mutex with the sync lock itself,
a guarantee that the synchronization state is cleaned up when
a request is complete.
This implementation avoids potential deadlocks or long wait times
when inotify is not enabled on a file system.
Signed-off-by: Eric Callahan <arksine.code@gmail.com>
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