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Re: [Xen-devel] some questions about the new blktap2 module

To: fanliang <fanliang@xxxxxxxxxx>
Subject: Re: [Xen-devel] some questions about the new blktap2 module
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Mon, 21 Dec 2009 11:16:56 +0200
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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On Mon, Dec 21, 2009 at 05:00:56PM +0800, fanliang wrote:
>    Hi, all:
>        I have some questions when read the code of the new blktap2 module.
>    One is  in function tapdisk_vbd_map_device ( ) . In this function , the
>    userspace proccess tapdisk2 used ioctl like this :
>    From the context , we can get that "ring->fd " is the file handle of the
>    ring-device  [/dev/xen/blktap-2/blktap[minor] ]  . In the blktap2 driver
>    codes , I find that blktap_ring_ioctl() didn't implement the
>    BLKTAP_IOCTL_SETMODE ioctl case . I used xen-unstable code package and
>    linux-2.6.18-xen-3.4.2 code package.
>    So my question is :
>    1,  Is blktap2 code in xen-unstable not match with linux-2.6.18-xen-3.4.2
>    ?
>    2,  Any body used VHD disk with blktap2 ?


Afaik blktap2 is not yet ready/working on pv_ops dom0 tree
(xen-unstable uses pv_ops dom0).

Jeremy can possibly comment more about the status of blktap2.

-- Pasi

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