[Xen-devel] [PATCH] xend: Fix VDI-VBD link for XenAPI

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi,

I detected problems of VDI-VBD link again.
  - In the case of inactive managed domains, VDI->VBD link was lost 
    by xend restarting (or host OS rebooting).
  - In the case of active domains, both VDI->VBD link and VBD->VDI 
    link were lost by xend restarting.

When xend is restarted, information of VDI instances is restored 
from a vdi.xml file.  But the vdi.xml file does not have UUID of VBD 
because xend does not write the UUID to the vdi.xml file.  Therefore, 
VDI->VBD link is lost.
When xend is restarted, information of VBD instances is restored 
from xenstore.  But xenstore does not have UUID of VDI.  Therefore, 
VBD->VDI link is lost.

This patch solves the problems.
VDI instances stop having UUID of VBD.  Instead, xend gathers UUID of 
VBD each time it's required.  The method is the same as Network->VIF 
link.
Information of VBD instances is restored not only from xenstore but 
from a config.sxp file.  UUID of VDI is restored from the config.sxp 
file.

FYI, VBD->VDI link of inactive managed domains is not lost because 
information of VBD instances is restored from the config.sxp file.
UUID of VDI is written by xend to the config.sxp file.


Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>

Best regards,
 Kan

Attachment: fix_VDI-VBD_link.patch
Description: Binary data

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