Test that when two lower hardlinks are copied up, they end up
as two upper hardlinks of the same upper inode.
Drop caches before copy up so there is no knowledge of the
copied up hardlink in inode/dcache.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This test checks if overlayfs hardlinks are preserved across
copy up. Check if they are preserved also after copy up and
mount cycle.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
diff may skip comparing content of files with identical st_ino/st_dev.
Overlayfs stat(2) may return same st_dev/st_ino for hardlink copy ups,
but it does not mean that read(2) will return the same content.
Convert the test to output hardlink files content to golden output
instead of using diff.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Introduce a new test to demonstrate a known issue with overlayfs:
- file A and B are hardlinked in lower
- modify A to trigger copy up
- file A is no longer a hardlink of file B
There is no fix for this issue at this time.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Amir Goldstein