Re: [PATCH v4 16/31] loop: use aio to perform io on the underlyingfile

From: Dave Kleikamp
Date: Mon Dec 03 2012 - 21:58:41 EST

On 12/03/2012 08:52 PM, Dave Chinner wrote:
> On Mon, Dec 03, 2012 at 10:59:39AM -0600, Dave Kleikamp wrote:
>> On 11/22/2012 05:06 PM, Dave Chinner wrote:

>>> And this extra fsync is now not done in the aio path. I.e. the AIO
>>> completion path needs to issue the fsync to maintain correct REQ_FUA
>>> semantics...
>> If this is really necessary, I can fix it.
> Absolutely. If we don't implement FUA properly, we'll end up with
> corrupted filesystems and/or data loss when kernel crashes or
> powerloss occurs. That's not an acceptable outcome, so we need FUA
> to be implemented properly.

Okay, just wanted to make sure.

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