On Thu, May 23, 2024 at 04:05:31PM -0300, Fabiano Rosas wrote:
> When the "file:" migration support was added we missed the special
> case in the qemu_open_old implementation that allows for a particular
> file name format to be used to refer to a set of file descriptors that
> have been previously provided to QEMU via the add-fd QMP command.
>
> When using this fdset feature, we should not truncate the migration
> file because being given an fd means that the management layer is in
> control of the file and will likely already have some data written to
> it. This is further indicated by the presence of the 'offset'
> argument, which indicates the start of the region where QEMU is
> allowed to write.
>
> Fix the issue by replacing the O_TRUNC flag on open by an ftruncate
> call, which will take the offset into consideration.
>
> Fixes: 385f510df5 ("migration: file URI offset")
> Suggested-by: Daniel P. Berrangé <berra...@redhat.com>
> Signed-off-by: Fabiano Rosas <faro...@suse.de>
> ---
> migration/file.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
