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1054
2012 Nov 22
3
blkfront failure on migrate
...3983.756743] pm_op(): xenbus_dev_resume+0x0/0x100 returns -12
[6673983.756759] PM: Device vbd-51712 failed to restore: error -12
[6673983.867532] PM: restore of devices complete after 182.808 msecs
Looking at the code in blkif_recover
(http://lxr.linux.no/#linux+v3.6.7/drivers/block/xen-blkfront.c#L1054)
In "Stage 1" as commented, we make a copy of the shadow map. We then
reset the contents of the real shadow map, and selectively copy the
in-use entries back from the copy to the real map.
Looking at the code, it appears possible to do this rearranging inplace
in the real shadow map, w...