ovl: improve mount helpers
Move common checks into ovl_mount_dir() helper.
Create helper for looking up lower directories.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
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Move common checks into ovl_mount_dir() helper.
Create helper for looking up lower directories.
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>