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Re: [Qemu-devel] [Qemu-block] [PATCH 0/2] qcow2: Do not mark inactive im
From: |
John Snow |
Subject: |
Re: [Qemu-devel] [Qemu-block] [PATCH 0/2] qcow2: Do not mark inactive images corrupt |
Date: |
Mon, 4 Jun 2018 14:58:15 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
On 06/04/2018 10:14 AM, Max Reitz wrote:
> 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(-)
>
Makes sense to me, provided it's safe to check via BDRV_O_RDWR instead
of bs->read_only. (I assume it is.)
Reviewed-by: John Snow <address@hidden>