[libvirt] [PATCH 0/2] rbd: improvements to actual disk-usage calculation

[jdillama at redhat.com]

From: Jason Dillaman <dillaman at redhat.com>

The RBD fast-diff feature can vastly reduce the amount of time needed
to calculate actual disk usage of volumes, but it might still be a 
slow operation for large RBD pools or pools with large RBD images.
Therefore, this feature should be able to be optionally disabled if
needed.

Additionally, the fast-diff feature can only be used if the fast-diff
map isn't flagged as invalid. Otherwise, librbd will silently perform
a costly block-by-block scan to calculate the disk usage.

Jason Dillaman (2):
  rbd: do not attempt to use fast-diff if it's marked invalid
  rbd: optionally disable actual disk-usage during pool/volume refresh

 docs/formatstorage.html.in        | 13 ++++-
 src/storage/storage_backend_rbd.c | 80 ++++++++++++++++++++++++++++---
 2 files changed, 84 insertions(+), 9 deletions(-)

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2.20.1