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

[Bart Van Assche <Bart.VanAssche@sandisk.com>]

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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?

Thanks,

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