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authorTrond Myklebust <trond.myklebust@primarydata.com>2016-09-22 13:39:12 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-09-27 14:34:54 -0400
commitb1a318de9bc4946ad4a20481ab3ce28c2e8cd72c (patch)
treee130b82c8bb97e7eec1adba8dc4f06aa6958d343 /fs/nfs
parent9c27869d3f0680fa01d15616891a666d9e30fd83 (diff)
NFSv4: Fix a race in nfs_inode_reclaim_delegation()
If we race with a delegreturn before taking the spin lock, we currently end up dropping the delegation stateid. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Tested-by: Oleg Drokin <green@linuxhacker.ru> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/delegation.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 5de4cfb2ab07..094e0efe6a82 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -195,15 +195,13 @@ void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
rcu_read_unlock();
put_rpccred(oldcred);
trace_nfs4_reclaim_delegation(inode, res->delegation_type);
- } else {
- /* We appear to have raced with a delegation return. */
- spin_unlock(&delegation->lock);
- rcu_read_unlock();
- nfs_inode_set_delegation(inode, cred, res);
+ return;
}
- } else {
- rcu_read_unlock();
+ /* We appear to have raced with a delegation return. */
+ spin_unlock(&delegation->lock);
}
+ rcu_read_unlock();
+ nfs_inode_set_delegation(inode, cred, res);
}
static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)