[PATCH 40/70] NFSd: Ensure that nfs4_open_delegation() references the delegation stateid

[Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>]

Ensure that nfs4_open_delegation() keeps a reference to the delegation
stateid until it is done working with it.

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
 fs/nfsd/nfs4state.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 822eed0de95d..d1e4f0e07f09 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -520,6 +520,7 @@ static void unhash_stid(struct nfs4_stid *s)
 static void
 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
 {
+	atomic_inc(&dp->dl_stid.sc_count);
 	dp->dl_stid.sc_type = NFS4_DELEG_STID;
 	spin_lock(&fp->fi_inode->i_lock);
 	list_add(&dp->dl_perfile, &fp->fi_delegations);
@@ -3395,6 +3396,7 @@ nfs4_open_delegation(struct net *net, struct svc_fh *fh,
 	dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
 		STATEID_VAL(&dp->dl_stid.sc_stateid));
 	open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
+	nfs4_put_delegation(dp);
 	return;
 out_free:
 	nfs4_put_delegation(dp);
-- 
1.9.0

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