linux-ext4 - Re: [Bug 70121] Increasing efficiency of full data journaling

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Message-ID: <531A2EF7.5010005@ubuntu.com>
Date:	Fri, 07 Mar 2014 15:41:27 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	bugzilla-daemon@...zilla.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [Bug 70121] Increasing efficiency of full data journaling

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On 3/6/2014 12:28 AM, bugzilla-daemon@...zilla.kernel.org wrote:
>> It does no such thing.
> 
> What does it not?

write("foo");
              <-- crash
write("bar");

Your file now has "foo" and not "bar".  The fact that "foo" hit the
journal first, and may or may not have hit the final location before
the crash doesn't change the fact that you crashed between the two
write calls, so "bar" is certainly lost, and if "foo" did hit the
disk, then you have a partially written, and thus corrupt file.


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