Re: [Xen-devel] CS 21556 (blktap2: Fix tapdisk disktype issues) is no longer working for "vhd" [and 1 more messages]

[Boris Derzhavets <bderzhavets@xxxxxxxxx>]

1. [PATCH] blktap2: blktap2 and pygrub (xen-unstable)

diff -r a672af698bc3 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py    Fri Jul 09 12:35:58 2010 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py    Sun Jul 11 17:16:39 2010 +0400
@@ -3261,6 +3261,7 @@
 
     taptype = blkdev_uname_to_taptype(disk)
     mounted = devtype in ['tap', 'tap2'] and taptype != 'aio' and taptype != 'sync' and not os.stat(fn).st_rdev
+            mounted_vbd_uuid = 0
             if mounted:
                 # This is a file, not a device.  pygrub can cope with a
                 # file if it's raw, but if it's QCOW or other such formats
@@ -3276,7 +3277,8 @@
 
                 from xen.xend import XendDomain
                 dom0 = XendDomain.instance().privilegedDomain()
-                dom0._waitForDeviceUUID(dom0.create_vbd(vbd, disk))
+                mounted_vbd_uuid = dom0.create_vbd(vbd, disk);
+                dom0._waitForDeviceUUID(mounted_vbd_uuid)
                 fn = BOOTLOADER_LOOPBACK_DEVICE
 
             try:
@@ -3286,8 +3288,9 @@
                 if mounted:
                     log.info("Unmounting %s from %s." %
                              (fn, BOOTLOADER_LOOPBACK_DEVICE))
-
-                    dom0.destroyDevice('tap', BOOTLOADER_LOOPBACK_DEVICE)
+                    _, vbd_info = dom0.info['devices'][mounted_vbd_uuid]
+                    dom0.destroyDevice(dom0.getBlockDeviceClass(vbd_info['devid']),
+                                       BOOTLOADER_LOOPBACK_DEVICE, force = True)
 
             if blcfg is None:
                 msg = "Had a bootloader specified, but can't find disk"

2. [PATCH] blktap/blktap2: Fix for incorrect parse disk configuration (xen-unstable)

diff -r a672af698bc3 tools/python/xen/util/blkif.py
--- a/tools/python/xen/util/blkif.py    Fri Jul 09 12:35:58 2010 +0100
+++ b/tools/python/xen/util/blkif.py    Sun Jul 11 12:13:34 2010 +0400
@@ -87,7 +87,10 @@
                 fn = "/dev/%s" %(fn,)
               
         if typ in ("tap", "tap2"):
-            (taptype, fn) = fn.split(":", 1)
+            if fn.count(":") == 1:
+                (taptype, fn) = fn.split(":", 1)
+            else:
+                (taptype, fn) = fn.split(":", 2)[1:3]
     return (fn, taptype)
 
 def blkdev_uname_to_file(uname):


I've tested this patches. They make things working for NexexentaStor 3.0.2 xen image
with "vhd" files and pygrub as bootloader at Xen 4.1-unstable ( tip CS) & 2.6.32.16 Dom0
on top of Ubuntu 10.04 Server.


Per exeCooler :-

process of booting DomU with 'mounted-blktap2' (VHD for example) and 'pygrub' as bootloader:

1. Connect boot-device to Dom0 as '/dev/xpvd'

2. Pygrub get info for load DomU

3. Disconnect boot-device from Dom0

4. Boot DomU

During step 3 created device disconnecting from Dom0, but xenstore does not scrape away after device disconnected from Dom0 => result: 

    "Error: Device /dev/xvdp (51952, tap2) is already connected."

During step 3 created device disconnecting from Dom0, but 'destroyDevice' method is passed 'tap' always => result:

    "Error: Device 51952 not connected"

Boris.
P.S. It's just a reminder of content been already posted by exeCooler to xen-devel mailing list.

--- On Mon, 7/12/10, eXeC001er <execooler@xxxxxxxxx> wrote:

From: eXeC001er <execooler@xxxxxxxxx>
Subject: Re: [Xen-devel] CS 21556 (blktap2: Fix tapdisk disktype issues) is no longer working for "vhd" [and 1 more messages]
To: "Ian Jackson" <Ian.Jackson@xxxxxxxxxxxxx>
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Boris Derzhavets" <bderzhavets@xxxxxxxxx>, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
Date: Monday, July 12, 2010, 1:08 PM

2010/7/12 Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

Boris Derzhavets writes ("[Xen-devel] CS 21556 (blktap2: Fix tapdisk disktype issues) is no longer working for "vhd""):
> In about the most recent 4-5 days an error :

This is related to 21541:7ff0e885b5c3 and 21728:51160a8ecf7d.

> root@ServerLSX:~/NexentaStor-Community-3.0.2# xm create -c nexentastor-community-3.0.2-xen.cfg
> Using config file "./nexentastor-community-3.0.2-xen.cfg".
> Error: [Errno 2] No such file or directory: 'vhd:/root/NexentaStor-Community-3.0.2/syspool.img'
>
> has been brought back under xen-unstable.

Does this work in 4.0-testing ?

No.

 

eXeC001er writes ("[Xen-devel] Re: CS 21556 (blktap2: Fix tapdisk disktype issues) is no longer working for "vhd""):
> My patch was not quite correct. I waited until the return change back to
> make a new one.
> The new patch will be ready today or tomorrow. Let's see how will the
> situation was.

Thanks.  As I wrote earlier:

 Can I ask you to try to (a) separate out these patches, and (b)
 explain the reasoning behind them in more detail ?  If you can
 provide a separate message with a separate patch for each change,
 with an explanation at greater length, it will be much easier for us
 to evaluate them.  Thanks.

I sent two patches: 

1. [PATCH] blktap2: blktap2 and pygrub (xen-unstable)

2. [PATCH] blktap/blktap2: Fix for incorrect parse disk configuration (xen-unstable)

 

Thanks,
Ian.

Thanks. 

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