NFSv4: Send RENEW requests to the server only when we're holding state

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 618a327027b3..75dfb1c717a0 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -8,6 +8,7 @@
  */
 #include <linux/config.h>
 #include <linux/completion.h>
+#include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
@@ -231,6 +232,51 @@ restart:
         spin_unlock(&clp->cl_lock);
 }
 
+int nfs_do_expire_all_delegations(void *ptr)
+{
+        struct nfs4_client *clp = ptr;
+        struct nfs_delegation *delegation;
+        struct inode *inode;
+        int err = 0;
+
+        allow_signal(SIGKILL);
+restart:
+        spin_lock(&clp->cl_lock);
+        if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0)
+                goto out;
+        if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
+                goto out;
+        list_for_each_entry(delegation, &clp->cl_delegations, super_list) {
+                inode = igrab(delegation->inode);
+                if (inode == NULL)
+                        continue;
+                spin_unlock(&clp->cl_lock);
+                err = nfs_inode_return_delegation(inode);
+                iput(inode);
+                if (!err)
+                        goto restart;
+        }
+out:
+        spin_unlock(&clp->cl_lock);
+        nfs4_put_client(clp);
+        module_put_and_exit(0);
+}
+
+void nfs_expire_all_delegations(struct nfs4_client *clp)
+{
+        struct task_struct *task;
+
+        __module_get(THIS_MODULE);
+        atomic_inc(&clp->cl_count);
+        task = kthread_run(nfs_do_expire_all_delegations, clp,
+                        "%u.%u.%u.%u-delegreturn",
+                        NIPQUAD(clp->cl_addr));
+        if (!IS_ERR(task))
+                return;
+        nfs4_put_client(clp);
+        module_put(THIS_MODULE);
+}
+
 /*
  * Return all delegations following an NFS4ERR_CB_PATH_DOWN error.
  */