[Qemu-devel] [PATCH 0/4] block: more read-only changes, related to backing files

[Naphtali Sprei]

The read-only changes broke qemu-img create with read-only base image
These changes fix it.
It also make things a little safer, opening the backing file for read-only,
upgrading to read-write only for commit, and back to read-only when done.

Naphtali Sprei (4):
  Add open_flags to BlockDriverState Will be used later
  qemu-img: Fix qemu-img can't create qcow image based on read-only
    image
  Block: readonly changes
  Open backing file read-only also for snapshot mode

 block.c     |   57 +++++++++++++++++++++++++++++++++++++++++++++++++--------
 block_int.h |    2 ++
 qemu-img.c  |   15 ++++++++++-----
 3 files changed, 61 insertions(+), 13 deletions(-)