Not all block format drivers expose an io_flush method (reasonable for
read-only protocols), so calling io_flush there will immediately segfault.
Fix by checking for the method's existence before calling it.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit
c53a7285b4377e91f30b7742c7e12c16d6bf86f0)
qemu_aio_wait();
QLIST_FOREACH(node, &aio_handlers, node) {
- ret |= node->io_flush(node->opaque);
+ if (node->io_flush) {
+ ret |= node->io_flush(node->opaque);
+ }
}
} while (qemu_bh_poll() || ret > 0);
}