For the general process of submitting patches to ceph, read the below

Submitting Patches

For documentation patches the following guide will help you get started

Documenting Ceph

Performance enhancements must come with test data and detailed explanations.

Code cleanup is appreciated along with a patch that fixes a bug or implements a feature. Except on rare occasions, code cleanup that only involve coding style or whitespace modifications are discouraged, primarily because they cause problems when rebasing and backporting.