Clone field from rados df command

[Mallikarjun Biradar <mallikarjuna.biradar@xxxxxxxxx>]

What exactly "clone" field from "rados df"meant for? 

Steps tried:

Created an rbd image & mapped it

Wrote some 1GB of data on /dev/rbd1 using fio

Unmapped rbd image

Took snapshot

Mapped rbd image again and overwrite 1GB of data using fio

Unmapped rbd image

Took snapshot

Mapped rbd image again and wrote 5GB of data by overwriting initial 1GB of data using fio

After this rados df is showing 256 clones under clone field. 

Since, I haven't created any rbd image clones, I want to get clarify on why rados df is displaying these clones?

-Thanks & Regards,

Arjun

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