From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Vyacheslav Kovalevsky <slava.kovalevskiy.2014@gmail.com>,
tytso@mit.edu, adilger.kernel@dilger.ca,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Writing more than 4096 bytes with O_SYNC flag does not persist all previously written data if system crashes
Date: Wed, 25 Feb 2026 06:20:41 -0800 [thread overview]
Message-ID: <aZ8FOX4S6bXYS8VZ@infradead.org> (raw)
In-Reply-To: <20260224222339.GA13823@frogsfrogsfrogs>
On Tue, Feb 24, 2026 at 02:23:39PM -0800, Darrick J. Wong wrote:
> He did, way at the beginning: open a file, write 5000 bytes, close it,
> open again with O_SYNC, write 300 bytes, close it, force-reboot, and
> watch the file come back up with only 4096 bytes written.
Oh, I misunderstood the load and thought it would write the 300 bytes
after the previous 5000 bytes. If it overwrites the result is totally
expected.
prev parent reply other threads:[~2026-02-25 14:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-18 13:29 Writing more than 4096 bytes with O_SYNC flag does not persist all previously written data if system crashes Vyacheslav Kovalevsky
2026-02-18 21:55 ` Andreas Dilger
2026-02-19 13:32 ` Theodore Tso
2026-02-23 12:46 ` Alejandro Colomar
2026-02-23 19:32 ` Theodore Tso
2026-02-24 1:21 ` Andreas Dilger
2026-03-03 13:19 ` Alejandro Colomar
2026-02-24 14:47 ` Christoph Hellwig
2026-02-24 22:23 ` Darrick J. Wong
2026-02-25 14:20 ` Christoph Hellwig [this message]
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