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-RBD Export & Import
-===================
-
-This is a file format of an RBD image or snapshot. It's a sparse format
-for the full image. There are three recording sections in the file.
-
-(1) Header.
-(2) Metadata.
-(3) Diffs.
-
-Header
-~~~~~~
-
-"rbd image v2\\n"
-
-Metadata records
-~~~~~~~~~~~~~~~~
-
-Every record has a one byte "tag" that identifies the record type,
-followed by length of data, and then some other data.
-
-Metadata records come in the first part of the image.  Order is not
-important, as long as all the metadata records come before the data
-records.
-
-In v2, we have the following metadata in each section:
-(1 Bytes) tag.
-(8 Bytes) length.
-(n Bytes) data.
-
-In this way, we can skip the unrecognized tag.
-
-Image order
------------
-
-- u8: 'O'
-- le64: length of appending data (8)
-- le64: image order
-
-Image format
-------------
-
-- u8: 'F'
-- le64: length of appending data (8)
-- le64: image format
-
-Image Features
---------------
-
-- u8: 'T'
-- le64: length of appending data (8)
-- le64: image features
-
-Image Stripe unit
------------------
-
-- u8: 'U'
-- le64: length of appending data (8)
-- le64: image striping unit
-
-Image Stripe count
-------------------
-
-- u8: 'C'
-- le64: length of appending data (8)
-- le64: image striping count
-
-Final Record
-~~~~~~~~~~~~
-
-End
----
-
-- u8: 'E'
-
-
-Diffs records
-~~~~~~~~~~~~~~~~~
-Record the all snapshots and the HEAD in this section. 
-
-- le64: number of diffs
-- Diffs ...
-
-Detail please refer to rbd-diff.rst