From: Olaf van der Spek <olafvdspek@gmail.com>
To: Massimo Maggi <massimo@mmmm.it>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Atomic file data replace API
Date: Fri, 7 Jan 2011 17:34:52 +0100 [thread overview]
Message-ID: <AANLkTin=1LqF_qCu0SXM3sP0670HDSnCuw55A48hDJBd@mail.gmail.com> (raw)
In-Reply-To: <4D274022.5070507@mmmm.it>
On Fri, Jan 7, 2011 at 5:32 PM, Massimo Maggi <massimo@mmmm.it> wrote:
> Are you suggesting to do:
> 1)fopen with O_TRUNC, O_ATOMIC: returns fd to a temporary file
> 2)application writes to that fd, with one or more system calls, in a
> short time or in long time, at his will.
> 3)at fclose (or even at fsync ) atomically swap "data pointer" of "re=
al
> file" with "temp file", then delete temp.In a transparent mode to
> userland. =C2=A0(something similar to e4defrag).
> Is this sum up correct?
Almost. Swap should probably not be done at fsync time.
Other open references (for example running executables) should be swapp=
ed too.
The new-file case has to be handled too.
Olaf
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next prev parent reply other threads:[~2011-01-07 16:34 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 20:01 Atomic file data replace API Olaf van der Spek
2011-01-07 13:55 ` Mike Fleetwood
2011-01-07 14:01 ` Olaf van der Spek
2011-01-07 14:10 ` Olaf van der Spek
2011-01-07 14:58 ` Chris Mason
2011-01-07 15:01 ` Olaf van der Spek
2011-01-07 15:05 ` Chris Mason
2011-01-07 15:08 ` Olaf van der Spek
2011-01-07 15:13 ` Chris Mason
2011-01-07 15:17 ` Olaf van der Spek
2011-01-07 16:12 ` Chris Mason
2011-01-07 16:19 ` Olaf van der Spek
2011-01-07 16:26 ` Hubert Kario
2011-01-07 19:29 ` Chris Mason
2011-01-08 14:40 ` Olaf van der Spek
2011-01-26 18:30 ` Olaf van der Spek
2011-01-26 19:30 ` Chris Mason
2011-01-26 21:56 ` Olaf van der Spek
2011-01-07 16:32 ` Massimo Maggi
2011-01-07 16:34 ` Olaf van der Spek [this message]
2011-01-07 19:29 ` Thomas Bellman
2011-01-08 14:36 ` Olaf van der Spek
2011-01-08 21:43 ` Thomas Bellman
2011-01-09 15:16 ` Olaf van der Spek
2011-01-09 18:56 ` Thomas Bellman
2011-01-09 19:06 ` Olaf van der Spek
2011-01-09 20:13 ` Phillip Susi
2011-01-08 1:11 ` Phillip Susi
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