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5f49f15cf4
kernel v4.13 introduced the index=on feature for not breaking hardlinks on copy-up. With the index feature enabled a regression was introduced - lower files that are hardlined while overlay is offline can result in lookup error after overlay in mounted. The regression was fixed by upstream commit 6eaf011144af ovl: fix EIO from lookup of non-indexed upper that was merged to v4.14-rc7. This test verifies that behavior is sane after creating lower hardlinks for copied up files while overlayfs is offline. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>