[Qemu-devel] [PATCH v6 0/6] minor qcow2 compression improvements

[Eric Blake <eblake@redhat.com>]

Even though v5 was posted earlier today, it was worth a respin:
- 2/6: add R-b [Berto]
- 4/6, 6/6: improve commit messages [Max]
- 5/6: new patch, with an iotests proving that 4/6 is a bug fix [Max]

The new test is rather slow (nearly 90 seconds for me using
tmpfs) unless it skips entirely (such as testing on ext4); ideas
for speeding it up are welcome (translation: maybe qemu should
optimize the search for the next available cluster to allocate,
and/or qemu-img check should be faster at reporting leaked
clusters)

001/6:[----] [--] 'qcow2: Prefer byte-based calls into bs->file'
002/6:[----] [--] 'qcow2: Document some maximum size constraints'
003/6:[----] [--] 'qcow2: Reduce REFT_OFFSET_MASK'
004/6:[----] [--] 'qcow2: Don't allow overflow during cluster allocation'
005/6:[down] 'iotests: Add new test 214 for max compressed cluster offset'
006/6:[----] [--] 'qcow2: Avoid memory over-allocation on compressed images'

Eric Blake (6):
  qcow2: Prefer byte-based calls into bs->file
  qcow2: Document some maximum size constraints
  qcow2: Reduce REFT_OFFSET_MASK
  qcow2: Don't allow overflow during cluster allocation
  iotests: Add new test 214 for max compressed cluster offset
  qcow2: Avoid memory over-allocation on compressed images

 docs/interop/qcow2.txt     | 40 +++++++++++++++++--
 block/qcow2.h              |  8 +++-
 block/qcow2-cluster.c      | 32 +++++++++------
 block/qcow2-refcount.c     | 27 ++++++++-----
 block/qcow2.c              |  2 +-
 tests/qemu-iotests/214     | 97 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/214.out | 54 ++++++++++++++++++++++++++
 tests/qemu-iotests/group   |  1 +
 8 files changed, 234 insertions(+), 27 deletions(-)
 create mode 100755 tests/qemu-iotests/214
 create mode 100644 tests/qemu-iotests/214.out

-- 
2.14.3