On Mon, Jan 05, 2026 at 03:29:55PM +0100, Fiona Ebner wrote:
> Commit 5634622bcb ("file-posix: allow BLKZEROOUT with -t writeback")
> enables the BLKZEROOUT ioctl when using 'writeback' cache, regressing
> certain 'qemu-img convert' invocations, because of a pre-existing
> issue. Namely, the BLKZEROOUT ioctl might fail with errno EINVAL when
> the request is shorter than the block size of the block device.
> Fallback to the bounce buffer, similar to when the ioctl is not
> supported at all, rather than treating such an error as fatal.
>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3257
> Resolves: https://bugzilla.proxmox.com/show_bug.cgi?id=7197
> Cc: [email protected]
> Signed-off-by: Fiona Ebner <[email protected]>
> ---
> block/io.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)Thanks, applied to my block tree with a TODO comment about taking the write_zeroes_alignment limit into account: https://gitlab.com/stefanha/qemu/commits/block Stefan
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