[Qemu-devel] [PATCH 0/2] qcow2: Do not mark inactive images corrupt

[Max Reitz <mreitz@redhat.com>]

The non-public logs in
https://bugzilla.redhat.com/show_bug.cgi?id=1583346 (sorry...) reveal
this problem:

$ (Create a qcow2 file "foo.qcow2" with a corrupted first L1 entry)
$ echo 'qemu-io none0 "read 0 512"' \
    | x86_64-softmmu/qemu-system-x86_64 -drive if=none,file=foo.qcow2 \
                                        -monitor stdio \
                                        -incoming exec:'cat /dev/null'
QEMU 2.12.50 monitor - type 'help' for more information
(qemu) qemu-io none0 "read 0 512"
qcow2: Marking image as corrupt: L2 table offset 0x44200 unaligned (L1 index: 0); further corruption events will be suppressed
qemu-system-x86_64: block/io.c:1691: bdrv_co_pwritev: Assertion `!(bs->open_flags & BDRV_O_INACTIVE)' failed.
[1]    18444 done                 echo 'qemu-io none0 "read 0 512"' | 
       18445 abort (core dumped)  x86_64-softmmu/qemu-system-x86_64 -drive if=none,file=foo.qcow2 -monitor stdi

Oops.


The first patch in this series fixes this by treating inactive images
like read-only images in this regard (which most importantly means not
trying to set the corrupt flag on them), the second one adds an iotest
case.


Max Reitz (2):
  qcow2: Do not mark inactive images corrupt
  iotests: Add case for a corrupted inactive image

 block/qcow2.c              |  4 +++-
 tests/qemu-iotests/060     | 30 ++++++++++++++++++++++++++++++
 tests/qemu-iotests/060.out | 14 ++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)

-- 
2.17.0