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H A Dexport.cdiff 4b91c30a5a19332e8dd10b601d05b72caf657730 Thu Jan 18 15:39:13 CET 2018 Amir Goldstein <amir73il@gmail.com> ovl: lookup connected ancestor of dir in inode cache

Decoding a dir file handle requires walking backward up to layer root and
for lower dir also checking the index to see if any of the parents have
been copied up.

Lookup overlay ancestor dentry in inode/dentry cache by decoded real
parents to shortcut looking up all the way back to layer root.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>