linux-kernel - Re: [PATCH 1/4] blk-mq: update comment for blk_mq_quiesce_queue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20221101172720.GA20526@lst.de>
Date:   Tue, 1 Nov 2022 18:27:20 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jinlong Chen <nickyc975@....edu.cn>
Cc:     axboe@...nel.dk, hch@....de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] blk-mq: update comment for
 blk_mq_quiesce_queue_nowait()

On Tue, Nov 01, 2022 at 11:11:34PM +0800, Jinlong Chen wrote:
> blk_mq_quiesce_queue_nowait() is now reasonably used by scsi_host_block()
> to avoid calling synchronize_rcu() for each LUN. We should not consider to
> remove it.

I strongly disagree about this being a reasonable use.  What SCSI did
there is a horrible hack that should have never been merged.  The
right thing to do is the per-tag_set quiesce that we've been working
on.