Re: double free of blocks occurred during online defrag

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Hi Aneesh,

Thanks for your reply.

Aneesh Kumar K.V wrote:
We dropped the patch because I found that the double free in my case was
not exactly due the explanation given in the patch above.

I asked to drop the patch in

http://article.gmane.org/gmane.comp.file-systems.ext4/10199

I also found that the patch is not completely correct. The meta-data
blocks which are added to the free_list are not allocated from any
prealloc space.

So what you are seeing may be a different problem which the patch is
hiding from happening.  I guess you will have to look more closely at why the
double-free is happening in your case.

-aneesh


I thought that the problem would be solved if we check whether on-disk and buddy
bitmap is different or not when inode prealloc space is released.
However, my understanding was incorrect.
I will continue examining this problem.

Best regards,
Kazuya Mio
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