On 15.05.2015 08:04, Fam Zheng wrote:
So that NBD export cannot submit IO during bdrv_drain_all().
Signed-off-by: Fam Zheng <f...@redhat.com>
---
nbd.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
But can_read is not cleared until nbd_update_can_read() is called, which
is only in nbd_request_get(), nbd_request_put(), and
nbd_co_receive_request(), which are all called from nbd_trip() - so the
one request which clears can_read will most probably be itself processed.
Maybe we should call nbd_update_can_read() in nbd_op_blocker_changed(),
for all clients of the export? Or just once somewhere at the beginning
of processing a request, and if io_blocked is set, just yield...
Max
