linux-ext4 - Re: Atomic non-durable file write API

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Message-ID: <20101223224740.GE12763@thunk.org>
Date:	Thu, 23 Dec 2010 17:47:40 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	Olaf van der Spek <olafvdspek@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: Atomic non-durable file write API

On Fri, Dec 24, 2010 at 09:43:09AM +1100, Dave Chinner wrote:
> 
> So you are looking for something like:
> 
> http://developer.apple.com/library/mac/#DOCUMENTATION/Darwin/Reference/ManPages/man2/exchangedata.2.html
> 

It doesn't look like the man page for exchangedata() states what
happens if the system crashes.  It says "atomic" the same way the
rename() system call says it is "atomic".... i.e., from the
perspective of processes running on the system see either the
pre-exchange or post-exchange state.

						- Ted
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