From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Fri, 28 Mar 2014 11:01:38 -0700
Subject: Wait for an IO to complete
In-Reply-To: <CADDndfOTsiuJV4-TQH8op4mfyvib-RtXeU4PFOy5AD=icAnS6Q@mail.gmail.com>
References: <CADDndfOTsiuJV4-TQH8op4mfyvib-RtXeU4PFOy5AD=icAnS6Q@mail.gmail.com>
Message-ID: <20140328180138.GA29170@kroah.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Fri, Mar 28, 2014 at 11:16:30PM +0530, Rishi Agrawal wrote:
> Hi All,
> 
> I want to wait in my code till the IO actually goes to the disk.

That's an issue, as you really don't know what a "disk" is from within
the kernel :)

Back up, what exactly are you trying to do?

> For example
> 
> struct buffer_head *bh=sb_bread(sb, 20)
> 
> strcpy(bh->b_data, "Some Data");
> 
> /* mark and sync */
> mark_buffer_dirty(bh);
> sync_dirty_buffer(bh);
> 
> The above code only adds the bh to the request queue and returns.

And that's all you should need.  Why do you feel you need more?

thanks,

greg k-h