Hi All,
When the same file is specified with blktap in two or more domains,
it is not checked regardless of the mode.
The configuration file is defined as follows.
Domain1 :
disk = [ ,"tap:aio:/xen/image/tmp/drive.img-1,xvdd,w" ]
Domain2 :
disk = [ ,"tap:aio:/xen/image/tmp/drive.img-1,xvdd,w" ]
Even if the same file is specified, the domain can be started.
# xm create -f Domain1
Using config file "./Domain1"
Started domain Domain1
# xm create -f Domain2
Using config file "./Domain2"
Started domain Domain2
Whether it is possible to share in the specified mode in file backend and
physical device is checked.
However, blktap is not checked at all.
Domain1 Domain2 phy: tap:
mode mode file:
--------+---------+----------+------------
w w Error Started
w r Error Started
w w! Started Started
r w Error Started
r r Started Started
r w! Started Started
w! w Error Started
w! r Started Started
w! w! Started Started
There is a possibility of breaking the file because it can
unconsciously share the same file by two or more domains.
We corrected to do the sharing-check for blktap similarly.
It was tested to check it similarly with all cases in this patch.
Signed-off-by: Takanori Kasai <kasai.takanori@xxxxxxxxxxxxxx>
Signed-off-by: Hirofumi Tsujimura <tsujimura.hirof@xxxxxxxxxxxxxx>
Best Regards
--
Takanori Kasai
Attachment:
sharing-check-for-blktap.patch
Description: Binary data
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