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NFSv4: Don't report revoked delegations as valid in nfs_have_delegation() 

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

Fixes: 869f9dfa4d ("NFSv4: Fix races between nfs_remove_bad_delegation()...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: stable@vger.kernel.org # v3.19+
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2016-09-22 13:38:53 -04:00 committed by Anna Schumaker
parent 7dc72d5f7a
commit b3f9e72390
1 changed files with 1 additions and 0 deletions
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fs/nfs/delegation.c
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@ -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);