[Xen-bugs] [Bug 424] New: Frontend directories are not been removed from store on {network, block}-detach

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=424

           Summary: Frontend directories are not been removed from store on
                    {network,block}-detach
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: mfb@xxxxxxxxxx
 BugsThisDependsOn: 420


If a device is detached from domU the backend directories are being removed by
hotplug scripts, but the frontend ones not.

Who is supposed to remove that?
1. The frontend driver/xenbus
2. Hotplug scripts on dom0

I tested the second approach, but as the the frontend device was not
unregistered it still watching the frontend nodes on store. After I remove that
directory frontend driver rewrite the state node.

When frontend device is unregistered I can remove frontend directory from store
that nothing changes there (as it should be). So we depend on bug #420.

Here is the same text I put on #420 report:
---
As exposed by "05_attach_and_dettach_device_repeatedly_pos" and
"09_attach_and_dettach_device_check_data_pos" if I try to attach a block device
after detach that it will fail without reporting any error.

Here is an example:

$xm block-attach my-domU phy:ram3 hda1 w

$xm block-list my-domU
(769 ((virtual-device 769) (backend-id 0) (state 4) (backend
/local/domain/0/backend/vbd/114/769) (ring-ref 8) (event-channel 6)))

$xm block-detach my-domU 769

$xm block-list my-domU
(769 ((virtual-device 769) (backend-id 0) (state 6) (backend
/local/domain/0/backend/vbd/114/769) (ring-ref 8) (event-channel 6)))

$xm block-attach my-domU phy:ram3 hda1 w

$xm block-list my-domU
(769 ((virtual-device 769) (backend-id 0) (state 1) (backend
/local/domain/0/backend/vbd/114/769) (ring-ref 8) (event-channel 6)))

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