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Re: [PATCH 1/2] migration/compress: compress QEMUFile is not writable
From: |
Wei Yang |
Subject: |
Re: [PATCH 1/2] migration/compress: compress QEMUFile is not writable |
Date: |
Thu, 7 Nov 2019 20:08:56 +0800 |
User-agent: |
Mutt/1.9.4 (2018-02-28) |
On Thu, Nov 07, 2019 at 11:59:10AM +0000, Dr. David Alan Gilbert wrote:
>* Wei Yang (address@hidden) wrote:
>> We open a file with empty_ops for compress QEMUFile, which means this is
>> not writable.
>
>That explanation sounds reasonable; but I'm confused by the history of
>this; the code was added by Liang Li in :
>
> b3be289 qemu-file: Fix qemu_put_compression_data flaw
>
> ( https://www.mail-archive.com/address@hidden/msg368974.html )
>
>with almost exactly the opposite argument; can we figure out why?
>
Hmm... sounds interesting.
Toke a look into the change log, which says
Current qemu_put_compression_data can only work with no writable
QEMUFile, and can't work with the writable QEMUFile. But it does
not provide any measure to prevent users from using it with a
writable QEMUFile.
We should fix this flaw to make it works with writable QEMUFile.
While I don't see a chance to use writable QEMUFile. Do I miss something?
>Dave
>
--
Wei Yang
Help you, Help me