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authorJ. Bruce Fields <bfields@redhat.com>2010-10-25 14:12:40 -0400
committerJ. Bruce Fields <bfields@redhat.com>2010-11-19 18:35:11 -0500
commitca7896cd83456082b1e78816cdf7e41658ef7bcd (patch)
treeb2af6517a66f213807de4cf8c8b6eb89c218eb8e /net/sunrpc
parent62bac4af3d778f6d06d351c0442008967c512588 (diff)
downloadlinux-ca7896cd83456082b1e78816cdf7e41658ef7bcd.tar.bz2
nfsd4: centralize more calls to svc_xprt_received
Follow up on b48fa6b99100dc7772af3cd276035fcec9719ceb 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>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/svc_xprt.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index a74cb67f15bf..dd61cd02461f 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -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);