UBIFS question, atomic file create/rename semantics

[Jon Povey]

Artem Bityutskiy wrote:
> On Mon, 2011-04-04 at 09:54 +0100, Jon Povey wrote:
>> I came up with the following and would appreciate any comments about
>> how reliable this should be:
>>
>> if [ ! -e $FILE ]
>> then
>>         prog > $FILE.tmp
>>         sync
>>         mv $FILE.tmp $FILE
>>         sync
>> fi
>
> It does not mean you should trust me and not test that, but I think
> "yes", your sequence should make it.

Thanks for the quick response!

I was not able to reproduce the "zero file" fault on the bench, if I
powered off shortly after the file was "created" before, on my bench
test it just didn't exist.

After this new code, it seems to reliably exist on flash as soon as
the block exists, so.. off to our testers to bang on it a bit.


--
Jon Povey
jon.povey at racelogic.co.uk

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