file_write_ramblock_iov() uses single-shot qio_channel_pwritev() and
only checks for ret < 0. A short write (0 <= ret < requested) would be
treated as success.
Switch to qio_channel_pwritev_all() which retries until all bytes are
written or an error occurs.
Fixes: f427d90b98 ("migration/multifd: Support outgoing mapped-ram stream format")
Signed-off-by: Junjie Cao <junjie.cao@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260420201317.30199-3-junjie.cao@intel.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
5e76440b56