ovl: factor out ovl_check_origin_fh()
Re-factor ovl_check_origin() and ovl_get_origin(), so origin fh xattr is read from upper inode only once during lookup with multiple lower layers and only once when verifying index entry origin. Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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