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SubjectRe: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
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Dave Kleikamp <dave.kleikamp@oracle.com> writes:

> On 04/20/2012 09:48 AM, Maxim V. Patlasov wrote:
>> On 03/30/2012 07:43 PM, Dave Kleikamp wrote:
>>> From: Zach Brown<zab@zabbo.net>
>>>
>>> This uses the new kernel aio interface to process loopback IO by
>>> submitting concurrent direct aio. Previously loop's IO was serialized
>>> by synchronous processing in a thread.
>>>
>>
>> The patch ignores REQ_FLUSH bit of bi_rw. Is it simply overlook?
>
> Good question. Since the loop device is sending only direct IO requests,
> it shouldn't be necessary to explicitly flush page cache, but REQ_FLUSH

REQ_FLUSH isn't about the page cache, it's about flushing the volatile
disk write cache. You need to handle that.

Cheers,
Jeff


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