From: Christoph Hellwig <hch@lst.de>
To: John Garry <john.g.garry@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Christoph Hellwig <hch@lst.de>,
"Darrick J. Wong" <djwong@kernel.org>,
linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org
Subject: Re: Do we need an opt-in for file systems use of hw atomic writes?
Date: Tue, 15 Jul 2025 08:02:47 +0200 [thread overview]
Message-ID: <20250715060247.GC18349@lst.de> (raw)
In-Reply-To: <6babdebb-45d1-4f33-b8b5-6b1c4e381e35@oracle.com>
On Mon, Jul 14, 2025 at 04:53:49PM +0100, John Garry wrote:
> I see. I figure that something like a FS_XFLAG could be used for that. But
> we should still protect bdev fops users as well.
I'm not sure a XFLAG is all that useful. It's not really a per-file
persistent thing. It's more of a mount option, or better persistent
mount-option attr like we did for autofsck.
>
> JFYI, I have done a good bit of HW and SW-based atomic powerfail testing
> with fio on a Linux dev board, so there is a decent method available for
> users to verify their HW atomics. But then testing power failures is not
> always practical. Crashing the kernel only tests AWUN, and AWUPF (for
> NVMe).
Yes. There's some ways to emulate power fail for file system level
power fail testing using dm-log-writes and similar, but that doesn't
help at all with testing the power fail behavior of the device which
we rely on here.
next prev parent reply other threads:[~2025-07-15 6:02 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-14 13:17 Do we need an opt-in for file systems use of hw atomic writes? Christoph Hellwig
2025-07-14 13:24 ` Theodore Ts'o
2025-07-14 13:30 ` Christoph Hellwig
2025-07-14 16:04 ` Darrick J. Wong
2025-07-15 6:00 ` Christoph Hellwig
2025-07-15 3:22 ` Martin K. Petersen
2025-07-15 6:00 ` Christoph Hellwig
2025-07-15 12:45 ` Martin K. Petersen
2025-07-14 13:39 ` John Garry
2025-07-14 13:50 ` Christoph Hellwig
2025-07-14 15:53 ` John Garry
2025-07-15 6:02 ` Christoph Hellwig [this message]
2025-07-15 8:42 ` John Garry
2025-07-15 9:03 ` Christoph Hellwig
2025-08-19 11:42 ` John Garry
2025-08-19 13:39 ` Christoph Hellwig
2025-08-19 14:36 ` John Garry
2025-08-19 14:43 ` Darrick J. Wong
2025-08-19 14:45 ` Christoph Hellwig
2025-08-21 14:01 ` Keith Busch
2025-07-15 10:02 ` Christian Brauner
2025-07-15 11:29 ` Christoph Hellwig
2025-07-15 12:20 ` Christian Brauner
2025-07-15 11:58 ` Theodore Ts'o
2025-07-14 20:53 ` Dave Chinner
2025-07-15 6:05 ` Christoph Hellwig
2025-07-15 20:56 ` Keith Busch
2025-07-16 5:50 ` Nilay Shroff
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