[v7,03/31] NFSv4: Don't report revoked delegations as valid in nfs_have_delegation()
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Message ID 1474565961-21303-4-git-send-email-trond.myklebust@primarydata.com
State New
Headers show

Commit Message

Trond Myklebust Sept. 22, 2016, 5:38 p.m. UTC
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@primarydata.com>
Cc: stable@vger.kernel.org # v3.19+
---
 fs/nfs/delegation.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 322c2585bc34..86d2c748140b 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -51,6 +51,7 @@  nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark)
 	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);