A recent change to rbd prevented rbd devices from being unmapped
when they were in use. However that change did not address a
different, but related problem. It is possible for an open (the
one that would bump the open count from 0 to 1) to begin after
a request to remove the rbd device has decided it can proceed.
To fix this, define a new "removing" flag to prevent opens from
proceeding once ermoval of a device has begun. The first patch
in this series defines a new flags field, and uses it for this
as well as the "exists" flag for snapshot mappings.
-Alex
[PATCH 1/2] rbd: define flags field, use it for exists flag
[PATCH 2/2] rbd: prevent open for image being removed
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