linux-kernel - State of the UBI fastmap feature

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Message-ID: <20250902-yarn-from-020874b4da63@thorsis.com>
Date: Tue, 2 Sep 2025 08:00:11 +0200
From: Alexander Dahl <ada@...rsis.com>
To: linux-mtd@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Subject: State of the UBI fastmap feature

Hello everyone,

after using UBI for almost 15 years now without fastmap, I'm currently
experimenting with that feature.  The help text in Kconfig menu
(drivers/mtd/ubi/Kconfig) still says "Experimental feature" and
further down:

> Important: this feature is experimental so far and the on-flash
> format for fastmap may change in the next kernel versions

Is this still the current state?  I can not remember seing any patches
touching fastmap in the last time.  Are there plans to stabilize this?
Will there be changes in the on-flash format?  Do folks even use this
feature?  In production?

Happy to get some opinions here.

Greets
Alex