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

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Message-ID: <bug-201685-13602-xqc5s3y2zD@https.bugzilla.kernel.org/>
Date:   Tue, 04 Dec 2018 18:22:40 +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 #228 from Guenter Roeck (linux@...ck-us.net) ---
I guess I should have been more specific. With CONFIG_SCSI_MQ_DEFAULT=y (or
scsi_mod.use_blk_mq=1), cfq is not available. That applies to any kernel
version with CONFIG_SCSI_MQ_DEFAULT=y (or scsi_mod.use_blk_mq=1), not just to
4.19, and it doesn't apply to 4.19 if CONFIG_SCSI_MQ_DEFAULT=n (or
scsi_mod.use_blk_mq=0).

It is quite irrelevant if other schedulers are available if
CONFIG_SCSI_MQ_DEFAULT=y (or scsi_mod.use_blk_mq=1). cfq is not available, and
it doesn't matter if it is set as default or not.

I hope this is specific enough this time. My apologies if I missed some other
means to enable or disable blk_mq.

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