[PATCH 28/70] NFSd: Add reference counting to the lock and open stateids

[Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>]

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
 fs/nfsd/nfs4state.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 41314e493110..32ab3f1c83f8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -710,8 +710,10 @@ static void close_generic_stateid(struct nfs4_ol_stateid *stp)
 	release_all_access(stp);
 }
 
-static void free_generic_stateid(struct nfs4_ol_stateid *stp)
+static void put_generic_stateid(struct nfs4_ol_stateid *stp)
 {
+	if (!atomic_dec_and_test(&stp->st_stid.sc_count))
+		return;
 	remove_stid(&stp->st_stid);
 	if (stp->st_file)
 		put_nfs4_file(stp->st_file);
@@ -730,7 +732,7 @@ static void __release_lock_stateid(struct nfs4_lockowner *lo,
 	if (file)
 		filp_close(file, (fl_owner_t)lo);
 	close_generic_stateid(stp);
-	free_generic_stateid(stp);
+	put_generic_stateid(stp);
 }
 
 static void unhash_lockowner(struct nfs4_lockowner *lo)
@@ -793,7 +795,7 @@ static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
 static void release_open_stateid(struct nfs4_ol_stateid *stp)
 {
 	unhash_open_stateid(stp);
-	free_generic_stateid(stp);
+	put_generic_stateid(stp);
 }
 
 static void unhash_openowner(struct nfs4_openowner *oo)
@@ -814,7 +816,7 @@ static void release_last_closed_stateid(struct nfs4_openowner *oo)
 	struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
 
 	if (s) {
-		free_generic_stateid(s);
+		put_generic_stateid(s);
 		oo->oo_last_closed_stid = NULL;
 	}
 }
@@ -3512,7 +3514,7 @@ void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
 	if (open->op_file)
 		nfsd4_free_file(open->op_file);
 	if (open->op_stp)
-		free_generic_stateid(open->op_stp);
+		put_generic_stateid(open->op_stp);
 }
 
 static __be32 lookup_clientid(clientid_t *clid, bool session, struct nfsd_net *nn, struct nfs4_client **clp)
@@ -4214,7 +4216,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	nfsd4_close_open_stateid(stp);
 
 	if (cstate->minorversion)
-		free_generic_stateid(stp);
+		put_generic_stateid(stp);
 	else
 		oo->oo_last_closed_stid = stp;
 
-- 
1.9.0

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