[Qemu-devel] [PATCH v2 0/3] qcow2: Drop REFCOUNT_SHIFT

[Max Reitz <mreitz@redhat.com>]

In preparation for qemu maybe actually supporting variable refcount
widths in the far future, drop the hardcoded REFCOUNT_SHIFT and instead
use the value as given by the image.

Also, the qcow2 documentation gave the width of a refcount block entry
as sizeof(uint16_t), which is wrong for any refcount order other than 4.
Fix that.

This is a follow-up to my "[PATCH v5 00/11] qcow2: Fix image repairing"
series and therefore depends on it.


v2:
- Patch 2: Fix wrongly fixed calculation [Benoît, Eric]
- Patch 3: Added [Eric]


git-backport-diff against v1:

Key:
[----] : patches are identical
[####] : number of functional differences between upstream/downstream patch
[down] : patch is downstream-only
The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively

001/3:[----] [--] 'qcow2: Drop REFCOUNT_SHIFT'
002/3:[0002] [FC] 'docs/qcow2: Correct refcount_block_entries'
003/3:[down] 'docs/qcow2: Limit refcount_order to [0, 6]'


Max Reitz (3):
  qcow2: Drop REFCOUNT_SHIFT
  docs/qcow2: Correct refcount_block_entries
  docs/qcow2: Limit refcount_order to [0, 6]

 block/qcow2-refcount.c | 32 ++++++++++++++------------------
 block/qcow2.c          |  2 +-
 block/qcow2.h          |  2 --
 docs/specs/qcow2.txt   |  3 ++-
 4 files changed, 17 insertions(+), 22 deletions(-)

-- 
2.1.0