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Re: [Qemu-block] [PATCH 1/2] qcow2: Do not mark inactive images corrupt
From: |
Jeff Cody |
Subject: |
Re: [Qemu-block] [PATCH 1/2] qcow2: Do not mark inactive images corrupt |
Date: |
Mon, 4 Jun 2018 16:06:11 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Mon, Jun 04, 2018 at 04:14:36PM +0200, Max Reitz wrote:
> When signaling a corruption on a read-only image, qcow2 already makes
> fatal events non-fatal (i.e., they will not result in the image being
> closed, and the image header's corrupt flag will not be set). This is
> necessary because we cannot set the corrupt flag on read-only images,
> and it is possible because further corruption of read-only images is
> impossible.
>
> Inactive images are effectively read-only, too, so we should do the same
> for them.
>
> (Otherwise, the assert(!(bs->open_flags & BDRV_O_INACTIVE)) in
> bdrv_co_pwritev() will fail, crashing qemu.)
>
> Cc: address@hidden
> Signed-off-by: Max Reitz <address@hidden>
> ---
> block/qcow2.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/block/qcow2.c b/block/qcow2.c
> index 59a38b9cd3..8b5f7386f7 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -4402,7 +4402,9 @@ void qcow2_signal_corruption(BlockDriverState *bs, bool
> fatal, int64_t offset,
> char *message;
> va_list ap;
>
> - fatal = fatal && !bs->read_only;
> + if ((bs->open_flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) != BDRV_O_RDWR) {
Hmm, this is pretty much exactly what the bdrv_is_writable() helper function
does in block.c; too bad it's scope is limited to block.c. Maybe worth it
to make it a more widely available helper and use it here?
> + fatal = false;
> + }
>
> if (s->signaled_corruption &&
> (!fatal || (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT)))
> --
> 2.17.0
>
>