Hi, during the past months we talked about making x-blockdev-reopen stable API, and one of the missing things was having support for changing bs->file. See here for the discusssion (I can't find the message from Kashyap that started the thread in the web archives):
https://lists.gnu.org/archive/html/qemu-block/2020-10/msg00922.html I was testing this and one of the problems that I found was that removing a filter node using this command is tricky because of the permission system, see here for details: https://lists.gnu.org/archive/html/qemu-block/2020-12/msg00092.html The good news is that Vladimir posted a set of patches that changes the way that permissions are updated on reopen: https://lists.gnu.org/archive/html/qemu-block/2020-11/msg00745.html I was testing if this would be useful to solve the problem that I mentioned earlier and it seems to be the case so I wrote a patch to add support for changing bs->file, along with a couple of test cases. This is still an RFC but you can see the idea. These patches apply on top of Vladimir's branch: git: https://src.openvz.org/scm/~vsementsov/qemu.git tag: up-block-topologic-perm-v2 Opinions are very welcome! Berto Alberto Garcia (2): block: Allow changing bs->file on reopen iotests: Update 245 to support replacing files with x-blockdev-reopen include/block/block.h | 1 + block.c | 61 ++++++++++++++++++++++++++++++++++++++ tests/qemu-iotests/245 | 61 +++++++++++++++++++++++++++++++++++--- tests/qemu-iotests/245.out | 4 +-- 4 files changed, 121 insertions(+), 6 deletions(-) -- 2.20.1