linux-ext4 - question about the casefold feature

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Message-ID: <f6df7d23-d465-5ae8-686c-11e772dc587f@accum.se>
Date: Thu, 25 Dec 2025 23:06:17 +0100 (CET)
From: Bo Branten <bosse@...um.se>
To: linux-ext4@...r.kernel.org
Subject: question about the casefold feature

Hello,
I am studying the casefold feature in ext4 and is trying to understand why 
it was classified as an incompat feature instead of an read-only incompat 
feature? What bad would happen if one only trys to read an fs that was 
created with casefolding with an old kernel as long as one don't do any 
new writing to it?

Bo Brantén