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libceph: add ceph_monc_wait_osdmap()

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Add ceph_monc_wait_osdmap(), which will block until the osdmap with the
specified epoch is received or timeout occurs.

Export both of these as they are going to be needed by rbd.

Signed-off-by: Ilya Dryomov <[email protected]>
Reviewed-by: Sage Weil <[email protected]>
This commit is contained in:
Ilya Dryomov 2014-05-13 11:19:27 +04:00 • committed by Yan, Zheng
commit 6044cde6f2
2 changed files with 29 additions and 0 deletions
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27
net/ceph/mon_client.c
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@ -296,6 +296,33 @@ void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
__send_subscribe(monc);
mutex_unlock(&monc->mutex);
}
EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
unsigned long timeout)
{
unsigned long started = jiffies;
int ret;
mutex_lock(&monc->mutex);
while (monc->have_osdmap < epoch) {
mutex_unlock(&monc->mutex);
if (timeout != 0 && time_after_eq(jiffies, started + timeout))
return -ETIMEDOUT;
ret = wait_event_interruptible_timeout(monc->client->auth_wq,
monc->have_osdmap >= epoch, timeout);
if (ret < 0)
return ret;
mutex_lock(&monc->mutex);
}
mutex_unlock(&monc->mutex);
return 0;
}
EXPORT_SYMBOL(ceph_monc_wait_osdmap);
/*
*