Is a reboot absolutely needed when moving from a plain /dev/sd* root to
a dm root ? From my understanding of how mount works, swapping the
block device from under a mounted fs is not possible without dm.
I expect it wouldn't be enough to replace s_dev, s_bdev and others in
the super_block struct while suspending all reads/writes, but I would
appreciate a "forget about it" or "it's possible" reply.
Thanks,
Bogdan
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