Re: Question about loop device DIO/AIO and FLUSH

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On Fri, Jul 01, 2016 at 05:17:28AM +0000, Damien Le Moal wrote:
> Thank you for the clarification. Makes sense.
> Just to be picky though, I think that "completed I/Os" applies only
> to flush in this case (flush of the volatile device cache to media).
> fsync of the host cache (page cache most of the time) to the device
> will issue new BIOs, and those will be waited for until completed.
> Right ?

For fsync the completed I/O at the syscall / VFS level.  Fsync only
needs to cover read/write calls that have return to the user, be that
through a synchronous call or aio completion.
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