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Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown.
From: |
Gleb Natapov |
Subject: |
Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown. |
Date: |
Wed, 13 Aug 2008 21:53:39 +0300 |
On Wed, Aug 13, 2008 at 09:40:34PM +0300, Avi Kivity wrote:
> Gleb Natapov wrote:
>> but what bother me is that we
>> consciously drop user data that we can easily save. Why? Real HW tries
>> hard to save every bit of user data and we just decided to drop it. The
>> difference between cancel or complete a request may be corrupted or not
>> corrupted file system after a crash.
>>
>>
>
> If a guest didn't wait for an I/O to complete, it shouldn't expect it to
> be on disk.
If you'll save your swiss bank account details in file and suddenly
your guest will crash, you'll surely appreciate if qemu will save it
for you :)
>
> Of course, we can have the IDE layer wait instead of cancelling, which
> will get the request onto the disk.
>
That is the current approach, but the wait is done for all block IO not
just IDE.
--
Gleb.
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., (continued)
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Anthony Liguori, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Gleb Natapov, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Anthony Liguori, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Gleb Natapov, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Avi Kivity, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown.,
Gleb Natapov <=
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Anthony Liguori, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Jamie Lokier, 2008/08/14
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Anthony Liguori, 2008/08/13
- Re: [Qemu-devel] [PATCH] Flush pending AIO on reboot and shutdown., Samuel Thibault, 2008/08/13