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

We try to go to wakeable sleep, so that, if drain begins it will break
the sleep. But what if nbd_client_co_drain_begin() already called and
s->drained is already true? We'll go to sleep, and drain will have to
wait for the whole timeout. Let's improve it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200727184751.15704-5-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-07-27 21:47:50 +03:00 committed by Eric Blake
parent fbeb3e63b3
commit 12c75e20a2
1 changed files with 6 additions and 5 deletions
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11
block/nbd.c
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@ -341,8 +341,6 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBDState *s)
qemu_co_queue_restart_all(&s->free_sema);
}
qemu_co_sleep_ns_wakeable(QEMU_CLOCK_REALTIME, timeout,
&s->connection_co_sleep_ns_state);
if (s->drained) {
bdrv_dec_in_flight(s->bs);
s->wait_drained_end = true;
@ -354,9 +352,12 @@ static coroutine_fn void nbd_co_reconnect_loop(BDRVNBDState *s)
qemu_coroutine_yield();
}
bdrv_inc_in_flight(s->bs);
}
if (timeout < max_timeout) {
timeout *= 2;
} else {
qemu_co_sleep_ns_wakeable(QEMU_CLOCK_REALTIME, timeout,
&s->connection_co_sleep_ns_state);
if (timeout < max_timeout) {
timeout *= 2;
}
}
nbd_reconnect_attempt(s);