linux-kernel - Recent changes mean sb_min

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Message-ID: <86290c9b-ba40-4ebd-96c1-d3a258abe9d4@squashfs.org.uk>
Date: Tue, 8 Apr 2025 06:33:53 +0100
From: Phillip Lougher <phillip@...ashfs.org.uk>
To: Jan Kara <jack@...e.cz>, Andreas Gruenbacher <agruenba@...hat.com>,
 Namjae Jeon <linkinjeon@...nel.org>, Sungjong Seo <sj1557.seo@...sung.com>,
 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
 Carlos Maiolino <cem@...nel.org>, "Darrick J. Wong" <djwong@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 Luis Chamberlain <mcgrof@...nel.org>
Subject: Recent changes mean sb_min_blocksize() can now fail

Hi,

A recent (post 6.14) change to the kernel means sb_min_blocksize() can now fail,
and any filesystem which doesn't check the result may behave unexpectedly as a
result.  This change has recently affected Squashfs, and checking the kernel code,
a number of other filesystems including isofs, gfs2, exfat, fat and xfs do not
check the result.  This is a courtesy email to warn others of this change.

The following emails give the relevant details.

https://lore.kernel.org/all/2a13ea1c-08df-4807-83d4-241831b7a2ec@squashfs.org.uk/
https://lore.kernel.org/all/129d4f39-6922-44e9-8b1c-6455ee564dda@squashfs.org.uk/

Regards

Phillip