fsnotify: parent event notification
inotify and dnotify both use a similar parent notification mechanism. We add a generic parent notification mechanism to fsnotify for both of these to use. This new machanism also adds the dentry flag optimization which exists for inotify to dnotify. Signed-off-by: NEric Paris <eparis@redhat.com> Acked-by: NAl Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de>
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