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[v2,33/38] nfsd: add locking to stateowner release

Message ID 1406666061-14175-34-git-send-email-jlayton@primarydata.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jeff Layton July 29, 2014, 8:34 p.m. UTC 
Once we remove the client_mutex, we'll need to properly protect
the stateowner reference counts using the cl_lock.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
---
 fs/nfsd/nfs4state.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)
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Patch

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index cd7d7df03afa..9b342e164407 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -937,9 +937,14 @@  release_all_access(struct nfs4_ol_stateid *stp)
 
 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
 {
-	if (!atomic_dec_and_test(&sop->so_count))
+	struct nfs4_client *clp = sop->so_client;
+
+	might_lock(&clp->cl_lock);
+
+	if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
 		return;
 	sop->so_ops->so_unhash(sop);
+	spin_unlock(&clp->cl_lock);
 	kfree(sop->so_owner.data);
 	sop->so_ops->so_free(sop);
 }
@@ -3078,11 +3083,7 @@  static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, u
 
 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
 {
-	struct nfs4_client *clp = so->so_client;
-
-	spin_lock(&clp->cl_lock);
 	unhash_openowner_locked(openowner(so));
-	spin_unlock(&clp->cl_lock);
 }
 
 static void nfs4_free_openowner(struct nfs4_stateowner *so)
@@ -4842,11 +4843,7 @@  find_lockowner_str(clientid_t *clid, struct xdr_netobj *owner,
 
 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
 {
-	struct nfs4_client *clp = sop->so_client;
-
-	spin_lock(&clp->cl_lock);
 	unhash_lockowner_locked(lockowner(sop));
-	spin_unlock(&clp->cl_lock);
 }
 
 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)