submit_bio() flush to disk immediately

[Rajat Sharma]

On Tue, Aug 6, 2013 at 12:39 PM, Prashant Shah <pshah.mumbai at gmail.com> wrote:
> Hi,
>
> I am trying to write a bio to a disk block directly using
> submit_bio(), it works without any errors but on read it shows the old
> data until I reboot the machine. Is there any way I can flush the
> particular bio/dirty page immediately or force it to flush before the
> next read ?
>

How are you reading and writing? What is your test utility? 'dd' has
an option to specify iflag/oflag=direct, which would bypass buffer
cache. But anyways this problem should not happen even if data is
written to cache, you should read it back from cache.

> code :
> https://github.com/prashants/km/blob/master/writeblock/writeblock.c
>
> Regards.
>
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Rajat