The rbd device structure has up to now contained information about
the rbd image (and possibly snapshot id) that backs it as well as
the device interface it represents in Linux when it is mapped. In
order to add layering support we're going to want to separate the
mapping information from the image information more clearly. This
was begun recently but these two patches do the bulk of the movement
of the rest of the mapping-related fields.
-Alex
[PATCH 1/2] rbd: move dev_id and list links into mapping
[PATCH 2/2] rbd: move more stuff into mapping
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