[Qemu-devel] [RFC PATCH 0/3] qcow2: Save requests during cluster allocation

[Kevin Wolf]

When a write request spans both allocated and unallocated clusters, qcow2
splits the request in two parts. This is not necessary if we have sequential
writes: If the unallocated area can be allocated such that in the image file it
is adjacent to the already allocated part, a single request is enough.

Kevin Wolf (3):
  qcow2: Factor out count_cow_clusters
  qcow2: Add qcow2_alloc_clusters_at()
  qcow2: Reduce number of I/O requests

 block/qcow2-cluster.c  |  274 +++++++++++++++++++++++++++++++++---------------
 block/qcow2-refcount.c |   28 +++++
 block/qcow2.h          |    3 +
 trace-events           |    1 +
 4 files changed, 222 insertions(+), 84 deletions(-)

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1.7.6.5