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    SubjectRe: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
    Date
    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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