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erofs claims its blob devices with the filesystem type as the holder so
several erofs superblocks can share one. Merge two images from a common
layer and a layer of their own, put the common layer on device-mapper,
mount both and check that:
- a suspend freezes each of them exactly once
- the resume thaws both
- once one of them is unmounted only the other one is frozen
- BLKFLSBUF and ustat() on the shared device work
- mounts that come and go while the device is suspended and resumed
leave nothing frozen behind
mkfs.erofs builds the images, the test is skipped without it.
Link: https://patch.msgid.link/20261012-work-super-dev_hash-v1-1-305cf71cd334@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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