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nfsd4: centralize more calls to svc_xprt_received 

Follow up on b48fa6b991 by moving all the
svc_xprt_received() calls for the main xprt to one place.  The clearing
of XPT_BUSY here is critical to the correctness of the server, so I'd
prefer it to be obvious where we do it.

The only substantive result is moving svc_xprt_received() after
svc_receive_deferred().  Other than a (likely insignificant) delay
waking up the next thread, that should be harmless.

Also reshuffle the exit code a little to skip a few other steps that we
don't care about the in the svc_delete_xprt() case.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2010-10-25 14:12:40 -04:00
parent 62bac4af3d
commit ca7896cd83
1 changed files with 14 additions and 12 deletions
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26
net/sunrpc/svc_xprt.c
View File

@ -716,7 +716,10 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
if (test_bit(XPT_CLOSE, &xprt->xpt_flags)) {
dprintk("svc_recv: found XPT_CLOSE\n");
svc_delete_xprt(xprt);
} else if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
/* Leave XPT_BUSY set on the dead xprt: */
goto out;
}
if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
struct svc_xprt *newxpt;
newxpt = xprt->xpt_ops->xpo_accept(xprt);
if (newxpt) {
@ -741,28 +744,23 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
spin_unlock_bh(&serv->sv_lock);
svc_xprt_received(newxpt);
}
svc_xprt_received(xprt);
} else {
dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",
rqstp, pool->sp_id, xprt,
atomic_read(&xprt->xpt_ref.refcount));
rqstp->rq_deferred = svc_deferred_dequeue(xprt);
if (rqstp->rq_deferred) {
svc_xprt_received(xprt);
if (rqstp->rq_deferred)
len = svc_deferred_recv(rqstp);
} else {
else
len = xprt->xpt_ops->xpo_recvfrom(rqstp);
svc_xprt_received(xprt);
}
dprintk("svc: got len=%d\n", len);
}
svc_xprt_received(xprt);
/* No data, incomplete (TCP) read, or accept() */
if (len == 0 || len == -EAGAIN) {
rqstp->rq_res.len = 0;
svc_xprt_release(rqstp);
return -EAGAIN;
}
if (len == 0 || len == -EAGAIN)
goto out;
clear_bit(XPT_OLD, &xprt->xpt_flags);
rqstp->rq_secure = svc_port_is_privileged(svc_addr(rqstp));
@ -771,6 +769,10 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
if (serv->sv_stats)
serv->sv_stats->netcnt++;
return len;
out:
rqstp->rq_res.len = 0;
svc_xprt_release(rqstp);
return -EAGAIN;
}
EXPORT_SYMBOL_GPL(svc_recv);