local allocator is rounding down extents to 0

[djs55]

It should always round up the number of extents:

No free blocks, sleeping for 5s
FreePool.extents 0 extents from ((pv0 (13 32)) (pv0 (11 1)))
There are 1 items in the journal to replay
((volume
  ((volume VHD-1637be81-1b4d-427b-ae6e-9c131a648e06)
   (segments
    (((start_extent 514) (extent_count 0)
      (cls (Linear ((name pv0) (start_extent 13)))))))))
 (device
  ((extents ((pv0 (13 0))))
   (device
    VG_XenStorage--e7752700--0506--dfee--77d2--4b9cfaa36d91-VHD--1637be81--1b4d--427b--ae6e--9c131a648e06)
   (targets
    (((start 4210688) (size 0)
      (kind
       (Linear
        ((device
          (Path
           /dev/disk/by-id/ata-WDC_WD2502ABYS-18B7A0_WD-WCAT1H344267-part3))
         (offset 127104))))))))))
Suspend local dm device
device-mapper: reload ioctl on VG_XenStorage--e7752700--0506--dfee--77d2--4b9cfaa36d91-VHD--1637be81--1b4d--427b--ae6e--9c131a648e06 failed: Invalid argument
Failed to process journal item: Failure("dm_task_run failed")