Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
new file mode 100644
index 0000000..667e06f
--- /dev/null
+++ b/fs/nfs/nfs4renewd.c
@@ -0,0 +1,148 @@
+/*
+ * fs/nfs/nfs4renewd.c
+ *
+ * Copyright (c) 2002 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Kendrick Smith <kmsmith@umich.edu>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Implementation of the NFSv4 "renew daemon", which wakes up periodically to
+ * send a RENEW, to keep state alive on the server. The daemon is implemented
+ * as an rpc_task, not a real kernel thread, so it always runs in rpciod's
+ * context. There is one renewd per nfs_server.
+ *
+ * TODO: If the send queue gets backlogged (e.g., if the server goes down),
+ * we will keep filling the queue with periodic RENEW requests. We need a
+ * mechanism for ensuring that if renewd successfully sends off a request,
+ * then it only wakes up when the request is finished. Maybe use the
+ * child task framework of the RPC layer?
+ */
+
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/clnt.h>
+
+#include <linux/nfs.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs.h>
+
+#define NFSDBG_FACILITY NFSDBG_PROC
+
+void
+nfs4_renew_state(void *data)
+{
+ struct nfs4_client *clp = (struct nfs4_client *)data;
+ long lease, timeout;
+ unsigned long last, now;
+
+ down_read(&clp->cl_sem);
+ dprintk("%s: start\n", __FUNCTION__);
+ /* Are there any active superblocks? */
+ if (list_empty(&clp->cl_superblocks))
+ goto out;
+ spin_lock(&clp->cl_lock);
+ lease = clp->cl_lease_time;
+ last = clp->cl_last_renewal;
+ now = jiffies;
+ timeout = (2 * lease) / 3 + (long)last - (long)now;
+ /* Are we close to a lease timeout? */
+ if (time_after(now, last + lease/3)) {
+ spin_unlock(&clp->cl_lock);
+ /* Queue an asynchronous RENEW. */
+ nfs4_proc_async_renew(clp);
+ timeout = (2 * lease) / 3;
+ spin_lock(&clp->cl_lock);
+ } else
+ dprintk("%s: failed to call renewd. Reason: lease not expired \n",
+ __FUNCTION__);
+ if (timeout < 5 * HZ) /* safeguard */
+ timeout = 5 * HZ;
+ dprintk("%s: requeueing work. Lease period = %ld\n",
+ __FUNCTION__, (timeout + HZ - 1) / HZ);
+ cancel_delayed_work(&clp->cl_renewd);
+ schedule_delayed_work(&clp->cl_renewd, timeout);
+ spin_unlock(&clp->cl_lock);
+out:
+ up_read(&clp->cl_sem);
+ dprintk("%s: done\n", __FUNCTION__);
+}
+
+/* Must be called with clp->cl_sem locked for writes */
+void
+nfs4_schedule_state_renewal(struct nfs4_client *clp)
+{
+ long timeout;
+
+ spin_lock(&clp->cl_lock);
+ timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal
+ - (long)jiffies;
+ if (timeout < 5 * HZ)
+ timeout = 5 * HZ;
+ dprintk("%s: requeueing work. Lease period = %ld\n",
+ __FUNCTION__, (timeout + HZ - 1) / HZ);
+ cancel_delayed_work(&clp->cl_renewd);
+ schedule_delayed_work(&clp->cl_renewd, timeout);
+ spin_unlock(&clp->cl_lock);
+}
+
+void
+nfs4_renewd_prepare_shutdown(struct nfs_server *server)
+{
+ struct nfs4_client *clp = server->nfs4_state;
+
+ if (!clp)
+ return;
+ flush_scheduled_work();
+ down_write(&clp->cl_sem);
+ if (!list_empty(&server->nfs4_siblings))
+ list_del_init(&server->nfs4_siblings);
+ up_write(&clp->cl_sem);
+}
+
+/* Must be called with clp->cl_sem locked for writes */
+void
+nfs4_kill_renewd(struct nfs4_client *clp)
+{
+ down_read(&clp->cl_sem);
+ if (!list_empty(&clp->cl_superblocks)) {
+ up_read(&clp->cl_sem);
+ return;
+ }
+ cancel_delayed_work(&clp->cl_renewd);
+ up_read(&clp->cl_sem);
+ flush_scheduled_work();
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
