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Date: Fri, 2 Mar 2012 08:12:40 -0500
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: fsync, rename, O_ATOMIC/O_PONIES
Message-ID: <20120302131240.GA14186@infradead.org>
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To: Olaf van der Spek <olaf@xwis.net>
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> I'd like to ask:
> - Is there a tool to log all unsafe operations?

What is an unsafe operation?  Anything that's dumb and might lose data?

The possibilities are sheer endless.

> - What is the *right* way to update a file?

 fd = open(tmpfile, ...);
 write(fd, ...);  // or any other update
 fdatasync(fd);
 rename(tmpfile, realfile);


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