[Qemu-devel] [PATCH v4 0/3] Change the backing file of images

[Kevin Wolf <kwolf@redhat.com>]

This patch series adds the functionality to change the backing file of existing
images. This includes simple renaming of a backing file without converting the
COW image as well as safe rebasing onto a different backing file that has some
changes compared to the current backing file.

v2:
- Added missing braces in copied code

v3:
- Added some missing error checks
- Fixed storing the backing file format in qcow2
- Open backing files with right format

v4:
- Handle bdrv_pwrite failure

Kevin Wolf (3):
  block: Introduce BDRV_O_NO_BACKING
  block: Add bdrv_change_backing_file
  qemu-img rebase

 block.c          |   24 +++++-
 block.h          |    3 +
 block/qcow2.c    |  101 ++++++++++++++++++++++++
 block_int.h      |    3 +
 qemu-img-cmds.hx |    6 ++
 qemu-img.c       |  227 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 6 files changed, 361 insertions(+), 3 deletions(-)