linux-kernel - [PATCH 4.4 061/112] NFSv4: Dont report revoked delegations as valid in nfs_have

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Date:   Wed, 26 Oct 2016 14:22:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Oleg Drokin <green@...uxhacker.ru>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: [PATCH 4.4 061/112] NFSv4: Dont report revoked delegations as valid in nfs_have_delegation()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit b3f9e7239074613aa6bdafa4caf7c104fe1e7276 upstream.

If the delegation is revoked, then it can't be used for caching.

Fixes: 869f9dfa4d6d ("NFSv4: Fix races between nfs_remove_bad_delegation()...")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Tested-by: Oleg Drokin <green@...uxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/delegation.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -51,6 +51,7 @@ nfs4_do_check_delegation(struct inode *i
 	rcu_read_lock();
 	delegation = rcu_dereference(NFS_I(inode)->delegation);
 	if (delegation != NULL && (delegation->type & flags) == flags &&
+	    !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) &&
 	    !test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) {
 		if (mark)
 			nfs_mark_delegation_referenced(delegation);