Re: [Xen-devel] [PATCH] fix free of event channel in blkfront

["Kasai Takanori" <kasai.takanori@xxxxxxxxxxxxxx>]

Hi,


> I boot the VM with a img file and the conf file is as follows
> ...
> disk = [ 'file:/vm/dom3.img,sda1,w' ]
>
> and if I want to attach another img file to the VM ,then
> the VM boot img must have many partitions such as sda ,sda1, sda2 when
> the img file is made and
> xm block-attach file:/vm1/template/another.img sda1 w
> then in the VM ,mount the sda1,and access it
> I am not for sure whether I understand your mean
> or do you mean that the another img file with I want to attach to the VM
> needs have many partitions?
The boot image when starting has already been allocated to sda1.
(BackDev: file:/vm/dom3.img)
Therefore, it is not possible to attach to sda1 by block-attach command.
Please do not overlap with FrontEnd device that has already been used.

It is recognized as follows if there is a partition in the attached file.
# xm block-attach file:/vm1/template/another.img sdb w

 another.img file (BackDev)  |   GuestOS(FrontDev)
-------------------------------------------------------
 3 partitions(1,2,3)         |   sdb, sdb1, sdb2, sdb3
 1 partitions(1)             |   sdb, sdb1
※ 1 -> sdb1, 2 -> sdb2, 3->sdb3

It is possible to recognized as follows if there is no partition in attached 
file.
# xm block-attach file:/vm1/template/another.img sdb1 w

Best Regards,

--
Takanori Kasai



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