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Re: TAKE 972756 - Implement fallocate.

To: Bhagi rathi <jahnu77@xxxxxxxxx>
Subject: Re: TAKE 972756 - Implement fallocate.
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 06 Nov 2007 13:04:05 -0600
Cc: David Chinner <dgc@xxxxxxx>, xfs@xxxxxxxxxxx
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Bhagi rathi wrote:
> File is of size 1k.  A 4k block is allocated as file-system block size is
> 4k.
>  Preallocation happened from 1k to 256k. Now, it looks to me that we have
> un-written extents from 4k to 256k. There is no guarantee that data from 1k
> to 4k is all zero'es. Fallocate is updating size.  Hence on subsequent read,
> we can get garbage from 1k to 4k and all zero'es from 4k to 256k

You've tested this and found it to be true?

-Eric

> Is the expectation here is application should take the responsibility of
> zero'ing
> data?  I still need to through fallocate requirements.


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