Re: [RFC PATCH 0/2] Introduce blkdev_issue_flush_no_wait()

[Anand Jain <anand.jain@oracle.com>]

On 05/16/2017 10:07 PM, Bart Van Assche wrote:
> On Tue, 2017-05-16 at 17:39 +0800, Anand Jain wrote:
>> BTRFS wanted a block device flush function which does not wait for
>> its completion, so that the flush for the next device can be called
>> in the same thread.
>>
>> Here is a RFC patch to provide the function
>> 'blkdev_issue_flush_no_wait()', which is based on the current device
>> flush function 'blkdev_issue_flush()', however it uses submit_bio()
>> instead of submit_bio_wait().
>>
>> This patch is for review comments, will send out a final patch based
>> on the comments received.
>
> Hello Anand,
>
> Since the block layer can reorder requests, I think using
> blkdev_issue_flush_no_wait() will only yield the intended result if
> the caller waits until the requests that have to be flushed have completed.
> Is that how you intend to use this function?

  Yes. The patch 2/2 did that. Sorry for no explanation though.

Thanks, Anand


> Thanks,
>
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