linux-kernel - [PATCH] nfs: Don't return referenced delegations

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Date:	Thu, 13 Dec 2012 14:37:16 +0800
From:	ycnian@...il.com
To:	Trond.Myklebust@...app.com
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	Yanchuan Nian <ycnian@...il.com>
Subject: [PATCH] nfs: Don't return referenced delegations

From: Yanchuan Nian <ycnian@...il.com>

The client returns unreferenced delegations in state management. It scans all
delegations and tests the NFS_DELEGATION_REFERENCED flag. if this flag is not
set, NFS_DELEGATION_RETURN will be set and the delegation will be returned. 
But unfortunately NFS_DELEGATION_REFERENCED is cleared after the testing, so 
delegations which are still being used will be returned in the next state
management.

Signed-off-by: Yanchuan Nian <ycnian@...il.com>
---
 fs/nfs/delegation.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 81c5eec..485e8c0 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -506,7 +506,7 @@ static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
 	struct nfs_delegation *delegation;
 
 	list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
-		if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
+		if (test_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
 			continue;
 		nfs_mark_return_delegation(server, delegation);
 	}
-- 
1.7.4.4

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