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[Xen-bugs] [Bug 1506] New: Support "bootloader" mode for "drbd:" devices

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Subject: [Xen-bugs] [Bug 1506] New: Support "bootloader" mode for "drbd:" devices
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Date: Wed, 2 Sep 2009 08:54:10 -0700
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           Summary: Support "bootloader" mode for "drbd:" devices
           Product: Xen
           Version: 3.0.4
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: michael.renner@xxxxxxxxx


there's a bit of glue missing in xend to support the "bootloader" stanza in
Guests which use a "drbd:" device as their bootdevice.

This patch extends and supersedes Bug #1438.

To be able to use "bootloader" on drbd devices the following changes need to be

*) Translation of devicename

_parse_uname which is used by blkdev_uname_to_file which is again used by
_configureBootloader in XendDomainInfo needs to be able to resolve drbd
resouces to the corresponding blockdevice to feed to the configured bootloader. 

*) Activation of drbd device

If the drbd device isn't in Primary mode when the bootloader tries to fetch the
kernel and initrd, the start of the DomU will fail. To prevent this the given
drbd device will be made Primary before the bootloader gets executed. 

The patches need some revising since I'm neither very fluent in Python nor
familiar with the error handling infrastructure in Xen.

A note on the naming of drbd resouces:

drbd uses mostly resource names in it's userland tools. Because of that drbd
VBDs, if configured with the "drbd:" type, should always use the drbd resource
name, as suggested by the drbd documentation at
http://www.drbd.org/users-guide-emb/s-xen-configure-domu.html . My patches
assume that the VBDs are named accordingly.

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