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(-)
