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block/nbd: nbd_co_reconnect_loop(): don't connect if drained 

In a recent commit 12c75e20a2 we've improved
nbd_co_reconnect_loop() to not make drain wait for additional sleep.
Similarly, we shouldn't try to connect, if previous sleep was
interrupted by drain begin, otherwise drain_begin will have to wait for
the whole connection attempt.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200903190301.367620-5-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-09-03 22:03:01 +03:00 committed by Eric Blake
parent 46f56631b5
commit 99d72dba1c
1 changed files with 3 additions and 0 deletions
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3
block/nbd.c
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@ -661,6 +661,9 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBDState *s)
} else {
qemu_co_sleep_ns_wakeable(QEMU_CLOCK_REALTIME, timeout,
&s->connection_co_sleep_ns_state);
if (s->drained) {
continue;
}
if (timeout < max_timeout) {
timeout *= 2;
}