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Re: fsync, rename, O_ATOMIC/O_PONIES

To: xfs@xxxxxxxxxxx
Subject: Re: fsync, rename, O_ATOMIC/O_PONIES
From: Olaf van der Spek <olaf@xxxxxxxx>
Date: Fri, 02 Mar 2012 13:39:37 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2
Hi XFS devs,

I'm a bit late to the party, but I'd like to respond to some comments at http://lwn.net/Articles/476263/#Comments
http://lwn.net/Articles/484709/

> Could any of the fsync advocates post real code that does the atomic variant of open, write, close?

> Hint: it's not possible without tons of regressions.

> Linux devs should really provide a proper solution (like O_ATOMIC) instead of blaming app devs for not doing the impossible.

I'd like to ask:
- Is there a tool to log all unsafe operations?
- What is the *right* way to update a file?

I've asked the last question multiple times, but nobody has been able to give me a proper answer.

Greetings,

Olaf

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