[PATCH AUTOSEL for 4.9 26/55] nfsd: Ensure we don't recognise lock stateids after freeing them

From: Sasha Levin <Alexander.Levin@microsoft.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>,
	"J . Bruce Fields" <bfields@redhat.com>,
	Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 26/55] nfsd: Ensure we don't recognise lock stateids after freeing them
Date: Wed, 24 Jan 2018 04:15:42 +0000	[thread overview]
Message-ID: <20180124041521.32223-26-alexander.levin@microsoft.com> (raw)
In-Reply-To: <20180124041521.32223-1-alexander.levin@microsoft.com>

From: Trond Myklebust <trond.myklebust@primarydata.com>

[ Upstream commit 659aefb68eca28ba9aa482a9fc64de107332e256 ]

In order to deal with lookup races, nfsd4_free_lock_stateid() needs
to be able to signal to other stateful functions that the lock stateid
is no longer valid. Right now, nfsd_lock() will check whether or not an
existing stateid is still hashed, but only in the "new lock" path.

To ensure the stateid invalidation is also recognised by the "existing lock"
path, and also by a second call to nfsd4_free_lock_stateid() itself, we can
change the type to NFS4_CLOSED_STID under the stp->st_mutex.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 fs/nfsd/nfs4state.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 7f3a11ab4191..fed5902099f5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5098,7 +5098,9 @@ nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
 	struct nfs4_ol_stateid *stp = openlockstateid(s);
 	__be32 ret;
 
-	mutex_lock(&stp->st_mutex);
+	ret = nfsd4_lock_ol_stateid(stp);
+	if (ret)
+		goto out_put_stid;
 
 	ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
 	if (ret)
@@ -5109,11 +5111,13 @@ nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
 			    lockowner(stp->st_stateowner)))
 		goto out;
 
+	stp->st_stid.sc_type = NFS4_CLOSED_STID;
 	release_lock_stateid(stp);
 	ret = nfs_ok;
 
 out:
 	mutex_unlock(&stp->st_mutex);
+out_put_stid:
 	nfs4_put_stid(s);
 	return ret;
 }
@@ -5678,6 +5682,8 @@ find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
 	lockdep_assert_held(&clp->cl_lock);
 
 	list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
+		if (lst->st_stid.sc_type != NFS4_LOCK_STID)
+			continue;
 		if (lst->st_stid.sc_file == fp) {
 			atomic_inc(&lst->st_stid.sc_count);
 			return lst;
@@ -5752,7 +5758,6 @@ lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
 	struct nfs4_lockowner *lo;
 	struct nfs4_ol_stateid *lst;
 	unsigned int strhashval;
-	bool hashed;
 
 	lo = find_lockowner_str(cl, &lock->lk_new_owner);
 	if (!lo) {
@@ -5775,15 +5780,7 @@ retry:
 		goto out;
 	}
 
-	mutex_lock(&lst->st_mutex);
-
-	/* See if it's still hashed to avoid race with FREE_STATEID */
-	spin_lock(&cl->cl_lock);
-	hashed = !list_empty(&lst->st_perfile);
-	spin_unlock(&cl->cl_lock);
-
-	if (!hashed) {
-		mutex_unlock(&lst->st_mutex);
+	if (nfsd4_lock_ol_stateid(lst) != nfs_ok) {
 		nfs4_put_stid(&lst->st_stid);
 		goto retry;
 	}
-- 
2.11.0
