Export rbd diff between clone and parent¶

Summary¶

                      s1
parent           O----O-------O
                        |   s2
clone                 O---O----O
                     (f)

Currently, there is no way to export diff betwen s2 and s1, if I forget to create snap (f) when clone image created.
So, this blueprint will add the function to handle it.

Owners¶

Li Wang (liwang@ubuntukyiln.com)
Yunchuan Wen(yunchuanwen@ubuntukylin.com)
Name

Interested Parties¶

Name (Affiliation)
Name (Affiliation)
Name

Current Status¶

when from_snap_id equal zero, librbd::diff_iterate would iterate parent image and gather the parent's diff information.

Detailed Description¶

1. Add a flag to diff_iterate routine, let it to skip the work of gather parent's diff when the flag is set.
2. Modify rbd export-diff command, like: rbd export-diff foo --from-parent file

Work items¶

Coding tasks¶

1. Task 1
2. Task 2
3. Task 3

Build / release tasks¶

1. Task 1
2. Task 2
3. Task 3

Documentation tasks¶

1. Task 1
2. Task 2
3. Task 3

Deprecation tasks¶

1. Task 1
2. Task 2
3. Task 3