linux-ext4 - Re: [PATCH -next RFC 01/14] block: add some bdev apis

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Date: Wed, 6 Dec 2023 09:57:46 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Theodore Ts'o <tytso@....edu>
Cc: Christoph Hellwig <hch@...radead.org>,
	Yu Kuai <yukuai1@...weicloud.com>, axboe@...nel.dk,
	roger.pau@...rix.com, colyli@...e.de, kent.overstreet@...il.com,
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	xiang@...nel.org, chao@...nel.org, adilger.kernel@...ger.ca,
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	linux-s390@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-bcachefs@...r.kernel.org, linux-btrfs@...r.kernel.org,
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	gfs2@...ts.linux.dev, linux-nilfs@...r.kernel.org,
	yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH -next RFC 01/14] block: add some bdev apis

On Wed, Dec 06, 2023 at 12:50:38PM -0500, Theodore Ts'o wrote:
> This was added because pulling a mounted a USB thumb drive (or a HDD
> drops off the SATA bus) while the file system is mounted and actively
> in use, would result in a kernel OOPS.  If that's no longer true,
> that's great, but it would be good to test to make sure this is the
> case....

And, surprise, surprise - that didn't just affect ext4.  So I ended
up fixing this properly in the block layer.

> If we really want to remove it, I'd suggest doing this as a separate
> commit, so that after we see syzbot reports, or users complaining
> about kernel crashes, we can revert the removal if necessary.

Yes, this should of course be separate, well documented commit.