ovl: store layer index in ovl_layer
Store the fs root layer index inside ovl_layer struct, so we can get the root fs layer index from merge dir lower layer instead of find it with ovl_find_layer() helper. Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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