tree c88c7fc51e95af85df170ec9def8cd726351329e
parent 95e1721805eb6c49d819e9d28f8e9f8f3a8936bf
author Daniel Rosenberg <drosen@google.com> 1455237855 -0800
committer chrmhoffmann <chrmhoffmann@gmail.com> 1502637937 +0200

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.

Change-Id: I09563baffad1711a045e45c1bd0bd8713c2cc0b6
Signed-off-by: Daniel Rosenberg <drosen@google.com>