ANDROID: vfs: add d_canonical_path for stacked filesystem support
Inotify does not currently know when a filesystem is acting as a wrapper around another fs. This means that inotify watchers will miss any modifications to the base file, as well as any made in a separate stacked fs that points to the same file. d_canonical_path solves this problem by allowing the fs to map a dentry to a path in the lower fs. Inotify can use it to find the appropriate place to watch to be informed of all changes to a file. Bug: 70706497 Bug: 120446149 Change-Id: I09563baffad1711a045e45c1bd0bd8713c2cc0b6 Signed-off-by:Daniel Rosenberg <drosen@google.com> [astrachan: Folded 34df4102216e ("ANDROID: fsnotify: Notify lower fs of open") into this patch] Signed-off-by:
Alistair Strachan <astrachan@google.com>
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