From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: Help
Date: Fri, 24 Jul 2015 08:46:06 +0100
Message-ID: <20150724074606.GB6750@zion.uk.xensource.com>
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To: Akash Talole <taloleakash@gmail.com>
Cc: wei.liu2@citrix.com, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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On Thu, Jul 23, 2015 at 08:35:20PM +0530, Akash Talole wrote:
> Hello,
> 
> Issue in tapdisk-vbd.c
> 
> Why td_queue_write(parent,treq); is called in  static void
> __tapdisk_vbd_reissue_td_request(td_vbd_t *vbd,td_image_t *image,
> td_request_t treq) function as we can't write in parent vhd because it is
> read only.
> 
> I have attached the code of tapdisk-vbd.c and block-vhd.c.
> 

There is no need to attach the code. We all have that in our repository.
:-)

> And please tell me about how to write into child vhd after reading from
> parent vhd in block-vhd.c in case of VHD_BM_BIT_CLEAR in function
> vhd_queue_read().
> 

Please describe what your end goal is so that developers with knowledge
in that area can help you better.

  http://wiki.xenproject.org/wiki/Asking_Developer_Questions

Wei.