ovl: create directories inside merged parent opaque
The benefit of making directories opaque on creation is that lookups can stop short when they reach the original created directory, instead of continue lookup the entire depth of parent directory stack. The best case is overlay with N layers, performing lookup for first level directory, which exists only in upper. In that case, there will be only one lookup instead of N. Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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