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Date: Thu, 21 Nov 2019 13:22:40 -0500 From: "Theodore Y. Ts'o" <tytso@....edu> To: "Darrick J. Wong" <darrick.wong@...cle.com> Cc: linux-ext4 <linux-ext4@...r.kernel.org>, eric.saint.etienne@...cle.com Subject: Re: [PATCH] tune2fs: prohibit toggling uninit_bg on live filesystems On Wed, Nov 20, 2019 at 11:32:55AM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@...cle.com> > > An internal customer followed an erroneous AskUbuntu article[1] to try to > change the UUID of a live ext4 filesystem. The article claims that you > can work around tune2fs' "cannot change UUID on live fs" error by > disabling uninit_bg, changing the UUID, and re-enabling the feature. > > This led to metadata corruption because tune2fs' journal descriptor > rewrite races with regular filesystem writes. Therefore, prevent > administrators from turning on or off uninit_bg on a mounted fs. > > [1] https://askubuntu.com/questions/132079/how-do-i-change-uuid-of-a-disk-to-whatever-i-want/195839#459097 > > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com> Thanks, applied. - Ted
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