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README: document naming inconsitency with datasets & filesystems

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Christian Schwarz 2017-10-05 21:56:37 +02:00
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@ -52,3 +52,20 @@ Make sure to develop an understanding how zrepl is typically used by studying th
* Open an issue when starting to hack on a new feature
* Commits should reference the issue they are related to
* Docs improvements not documenting new features do not require an issue.
### Glossary & Naming Inconsistencies
In ZFS, *dataset* refers to the objects *filesystem*, *ZVOL* and *snapshot*. <br />
However, we need a word for *filesystem* & *ZVOL* but not a snapshot, bookmark, etc.
Toward the user, the following terminology is used:
* **filesystem**: a ZFS filesystem or a ZVOL
* **filesystem version**: a ZFS snapshot or a bookmark
Sadly, the zrepl implementation is inconsistent in its use of these words:
variables and types are often named *dataset* when they in fact refer to a *filesystem*.
There will not be a big refactoring (an attempt was made, but it's destroying too much history without much gain).
However, new contributions & patches should fix naming without further notice in the commit message.