dm thin: don't allow changing data device during thin-pool reload
The existing code allows changing the data device when the thin-pool target is reloaded. This capability is not required and only complicates device lifetime guarantees. This can cause crashes like the one reported here: https://bugzilla.redhat.com/show_bug.cgi?id=1788596 where the kernel tries to issue a flush bio located in a structure that was already freed. Take the first step to simplifying the thin-pool's data device lifetime by disallowing changing it. Like the thin-pool's metadata device, the data device is now set in pool_create() and it cannot be changed for a given thin-pool. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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