[sheepdog] [PATCH] sheep: fix oid scheduling in recovery

[Christoph Hellwig]

I think the right fix is to simply give each recover_object_work() call
it's own work_struct in a structure also containing the oid.  While
this means a memory allocation per object to be recovered it also means
complete independence between recovery operations, including kicking off
onces that have I/O pending ASAP and allowing multiple recoveries in
parallel.  I'm about to leave for a long haul flight and will try to
implement this solution while I'm on the plane.