[PATCH v2] nfsd: fix bug on nfs4 stateid deallocation

[ycnian@gmail.com]

NFS4_OO_PURGE_CLOSE is not handled properly. To avoid memory leak, nfs4 
stateid which is pointed by oo_last_closed_stid is freed in nfsd4_close(), 
but NFS4_OO_PURGE_CLOSE isn't cleared meanwhile. So the stateid released in 
THIS close procedure may be freed immediately in the coming encoding function.
Sorry that Signed-off-by was forgotten in last version.

Signed-off-by: Yanchuan Nian <ycnian@gmail.com>
---
 fs/nfsd/nfs4state.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index cc41bf4..d972db8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3827,6 +3827,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	nfsd4_close_open_stateid(stp);
 	release_last_closed_stateid(oo);
+	oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
 	oo->oo_last_closed_stid = stp;
 
 	if (list_empty(&oo->oo_owner.so_stateids)) {
-- 
1.7.4.4