linux-ext4 - [Bug 201685] ext4 file system corruption

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Date:   Tue, 04 Dec 2018 18:34:45 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 201685] ext4 file system corruption

https://bugzilla.kernel.org/show_bug.cgi?id=201685

--- Comment #231 from Steven Noonan (steven@...inklabs.net) ---
(In reply to Jens Axboe from comment #227)
> (In reply to Steven Noonan from comment #225)
> > When scsi_mod.use_blk_mq=1 (i.e. result of CONFIG_SCSI_MQ_DEFAULT=y), the
> > I/O scheduler is just "none", and you cannot set a different scheduler.
> 
> That's not true, you can set MQ capable schedulers. CFQ is from the legacy
> stack, it doesn't support MQ. But you can set none/bfq/mq-deadline/kyber,
> for instance.

My bad. I was basing my response on outdated information:

https://mahmoudhatem.wordpress.com/2016/02/08/oracle-uek-4-where-is-my-io-scheduler-none-multi-queue-model-blk-mq/

(Also didn't want to risk turning on MQ on one of my machines just to word my
response, especially if not having CFQ is somehow involved in this corruption
bug!)

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