some questions about the new blktap2 module

some questions about the new blktap2 module

[fanliang]

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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 :  
     ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
>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 ?
 
Thanks ,
Lyman Van

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Re: some questions about the new blktap2 module

[Pasi Kärkkäinen]

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 :
>         ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
>    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 ?
> 

Hello,

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

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

[fanliang]

Thank you a lot for your attention . 
I got the dom0 kernel source code from xensource.com, and I don't know whether it's the same with  pv_ops dom0 source tree .  I'm wondering that how can people use VHD devices under the new blktap2 if he use SUSE11 as dom0 , whose kernel is 2.6.27 .  In my mind,  the new blktap2 module is developed matching with kernel 2.6.18 . For example, blktap2 includes lots header files from  linux-2.6.18. Is this right ? 


 

-----邮件原件-----
发件人: Pasi Kärkkäinen [mailto:pasik@iki.fi] 
发送时间: 2009年12月21日 17:17
收件人: fanliang
抄送: xen-devel@lists.xensource.com; Jeremy Fitzhardinge
主题: Re: [Xen-devel] some questions about the new blktap2 module

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 :
>         ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
>    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 ?
> 

Hello,

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

Re: ??????: some questions about the new blktap2 module

[Pasi Kärkkäinen]

On Mon, Dec 21, 2009 at 08:10:30PM +0800, fanliang wrote:
> Thank you a lot for your attention . 
> I got the dom0 kernel source code from xensource.com, and I don't know whether it's the same with  pv_ops dom0 source tree .  I'm wondering that how can people use VHD devices under the new blktap2 if he use SUSE11 as dom0 , whose kernel is 2.6.27 .  In my mind,  the new blktap2 module is developed matching with kernel 2.6.18 . For example, blktap2 includes lots header files from  linux-2.6.18. Is this right ? 
> 

pv_ops dom0 changelog is here:
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=xen/master

That's the tree xen-unstable automatically fetches/uses.

SLES11 2.6.27 Xen dom0 kernel is forward-ported from 2.6.18-xen. 
I'm not sure if Novell ported blktap2 aswell.

-- Pasi

> 
>  
> 
> -----????????????-----
> ?????????: Pasi Kärkkäinen [mailto:pasik@iki.fi] 
> ????????????: 2009???12???21??? 17:17
> ?????????: fanliang
> ??????: xen-devel@lists.xensource.com; Jeremy Fitzhardinge
> ??????: Re: [Xen-devel] some questions about the new blktap2 module
> 
> 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 :
> >         ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
> >    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 ?
> > 
> 
> Hello,
> 
> 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
> 
> 
> 

Re: ??????: some questions about the new blktap2 module

[Jan Beulich]

>>> Pasi Kärkkäinen<pasik@iki.fi> 21.12.09 13:25 >>>
>SLES11 2.6.27 Xen dom0 kernel is forward-ported from 2.6.18-xen. 
>I'm not sure if Novell ported blktap2 aswell.

No, that tree pre-dates blktap2. Newer kernels of ours have it, but the
2.6.27 tree isn't expected to ever get it added.

Jan

RE: ??????: some questions about the new blktap2 module

[Ian Pratt]

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> >>> Pasi Kärkkäinen<pasik@iki.fi> 21.12.09 13:25 >>>
> >SLES11 2.6.27 Xen dom0 kernel is forward-ported from 2.6.18-xen.
> >I'm not sure if Novell ported blktap2 aswell.
> 
> No, that tree pre-dates blktap2. Newer kernels of ours have it, but the
> 2.6.27 tree isn't expected to ever get it added.

The 2.6.27 XCP and XCI trees on xenbits both have blktap2. 

Ian 

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Re: ??????: some questions about the new blktap2 module

[Pasi Kärkkäinen]

On Mon, Dec 21, 2009 at 09:01:26PM +0000, Ian Pratt wrote:
> > >>> Pasi Kärkkäinen<pasik@iki.fi> 21.12.09 13:25 >>>
> > >SLES11 2.6.27 Xen dom0 kernel is forward-ported from 2.6.18-xen.
> > >I'm not sure if Novell ported blktap2 aswell.
> > 
> > No, that tree pre-dates blktap2. Newer kernels of ours have it, but the
> > 2.6.27 tree isn't expected to ever get it added.
> 
> The 2.6.27 XCP and XCI trees on xenbits both have blktap2. 
>

Oh, XCP tree is now online? 

-- Pasi

Re: some questions about the new blktap2 module

[fanliang]

I see. 
>From  /pub/scm / linux/kernel/git/jeremy/xen.git / tree    I can see that the new kernel tree discard the old blktap source files , instead by the new blktap2 files. 
Thanks again.



-----邮件原件-----
发件人: Pasi Kärkkäinen [mailto:pasik@iki.fi] 
发送时间: 2009年12月21日 20:26
收件人: fanliang
抄送: xen-devel@lists.xensource.com; 'Jeremy Fitzhardinge'
主题: Re: ??????: [Xen-devel] some questions about the new blktap2 module

On Mon, Dec 21, 2009 at 08:10:30PM +0800, fanliang wrote:
> Thank you a lot for your attention . 
> I got the dom0 kernel source code from xensource.com, and I don't know whether it's the same with  pv_ops dom0 source tree .  I'm wondering that how can people use VHD devices under the new blktap2 if he use SUSE11 as dom0 , whose kernel is 2.6.27 .  In my mind,  the new blktap2 module is developed matching with kernel 2.6.18 . For example, blktap2 includes lots header files from  linux-2.6.18. Is this right ? 
> 

pv_ops dom0 changelog is here:
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=xen/master

That's the tree xen-unstable automatically fetches/uses.

SLES11 2.6.27 Xen dom0 kernel is forward-ported from 2.6.18-xen. 
I'm not sure if Novell ported blktap2 aswell.

-- Pasi

> 
>  
> 
> -----????????????-----
> ?????????: Pasi Kärkkäinen [mailto:pasik@iki.fi]
> ????????????: 2009???12???21??? 17:17
> ?????????: fanliang
> ??????: xen-devel@lists.xensource.com; Jeremy Fitzhardinge
> ??????: Re: [Xen-devel] some questions about the new blktap2 module
> 
> 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 :
> >         ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
> >    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 ?
> > 
> 
> Hello,
> 
> 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
> 
> 
> 

Re: some questions about the new blktap2 module

[Jeremy Fitzhardinge]

On 12/21/2009 01:16 AM, Pasi Kärkkäinen wrote:
> 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.
>    

I've got it to the stage where I can start a domain and it can access 
its disk, but the tapdisk process consumes 100% of the CPU and throws 
kernel oopses when you terminate the domain...

     J

some questions about the new blktap2 module

[fanliang]

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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 :  
     ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
>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 ?
 
Thanks ,
Lyman Van

  _____  

发件人: fanliang [mailto:fanliang@huawei.com] 
发送时间: 2009年12月21日 16:44
收件人: 'xen-devel@lists.xensource.com'
抄送: 'cqj@huawei.com'
主题: some questions about the new blktap2 module


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 :  
     ioctl(ring->fd, BLKTAP_IOCTL_SETMODE, BLKTAP_MODE_INTERPOSE);
>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 ?
 
Thanks ,
Lyman Van

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