linux-kernel - [PATCH 3/3] SUNRPC: PipeFS MOUNT notification optimization for dying clients

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Message-ID: <20130610144015.7498.92979.stgit@localhost.localdomain>
Date:	Mon, 10 Jun 2013 18:40:15 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Trond.Myklebust@...app.com
Cc:	linux-nfs@...r.kernel.org, devel@...nvz.org,
	linux-kernel@...r.kernel.org, jlayton@...hat.com
Subject: [PATCH 3/3] SUNRPC: PipeFS MOUNT notification optimization for dying
	clients

Not need to create pipes for dying client. So just skip them.

Note: we can safely dereference the client structure, because notification
caller is holding sn->pipefs_sb_lock.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc: stable@...r.kernel.org
---
 net/sunrpc/clnt.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 3c133f2..fc4f4d1 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -185,6 +185,8 @@ static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event
 	if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
 	    ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
 		return 1;
+	if ((event == RPC_PIPEFS_MOUNT) && atomic_read(&clnt->cl_count) == 0)
+		return 1;
 	return 0;
 }
 

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