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

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Message-ID: <bug-201685-13602-6wa6F71yTZ@https.bugzilla.kernel.org/>
Date:   Tue, 04 Dec 2018 18:04:00 +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 #225 from Steven Noonan (steven@...inklabs.net) ---
(In reply to Manfred from comment #224)
> (In reply to Guenter Roeck from comment #223)
> 
> > There is a key difference, though: With 4.18.20, cfq is active.
> > 
> > $ cat /sys/block/sd*/queue/scheduler
> > noop deadline [cfq] 
> > noop deadline [cfq] 
> > 
> > In 4.19, cfq is not available    <--- ?
> 
> # grep  -i cfq    config-4.19.3-gentoo
> 
> CONFIG_IOSCHED_CFQ=y                       < --- !
> # CONFIG_CFQ_GROUP_IOSCHED is not set
> CONFIG_DEFAULT_CFQ=y
> CONFIG_DEFAULT_IOSCHED="cfq"
> 

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.

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