diff -ru linux-2.6.24.2/fs/nfsd/export.c linux-2.6.24.2-nfs.suspend/fs/nfsd/export.c
--- linux-2.6.24.2/fs/nfsd/export.c	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-nfs.suspend/fs/nfsd/export.c	2008-02-13 12:55:17.000000000 -0800
@@ -921,7 +921,7 @@
 	down_read(&hash_sem);
 }
 
-static inline void
+void
 exp_writelock(void)
 {
 	down_write(&hash_sem);
@@ -933,7 +933,7 @@
 	up_read(&hash_sem);
 }
 
-static inline void
+void
 exp_writeunlock(void)
 {
 	up_write(&hash_sem);
@@ -1635,6 +1635,17 @@
 }
 
 /*
+ * Flush exports table without calling RW semaphore.
+ * The caller is required to lock and unlock the export table.
+ */
+void
+export_purge(void)
+{
+	        cache_purge(&svc_expkey_cache);
+	        cache_purge(&svc_export_cache);
+}
+
+/*
  * Initialize the exports module.
  */
 void
Only in linux-2.6.24.2-nfs.suspend/fs/nfsd: export.c.orig
diff -ru linux-2.6.24.2/fs/nfsd/nfsctl.c linux-2.6.24.2-nfs.suspend/fs/nfsd/nfsctl.c
--- linux-2.6.24.2/fs/nfsd/nfsctl.c	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-nfs.suspend/fs/nfsd/nfsctl.c	2008-02-13 12:55:17.000000000 -0800
@@ -39,7 +39,7 @@
 #include <asm/uaccess.h>
 
 /*
- *	We have a single directory with 9 nodes in it.
+ *	We have a single directory with several nodes in it.
  */
 enum {
 	NFSD_Root = 1,
@@ -57,6 +57,7 @@
 	NFSD_Versions,
 	NFSD_Ports,
 	NFSD_MaxBlkSize,
+	NFSD_Suspend,
 	/*
 	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
 	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
@@ -149,6 +150,26 @@
 	.release	= simple_transaction_release,
 };
 
+static ssize_t nfsctl_suspend_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
+{
+	printk("Suspending NFS transactions!\n");
+	exp_writelock();
+	export_purge();
+	return size;
+}
+
+static ssize_t nfsctl_suspend_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
+{
+	printk("Resuming NFS transactions!\n");
+	exp_writeunlock();
+	return 0;
+}
+
+static struct file_operations suspend_ops = {
+	.write		= nfsctl_suspend_write,
+	.read		= nfsctl_suspend_read,
+};
+
 extern struct seq_operations nfs_exports_op;
 static int exports_open(struct inode *inode, struct file *file)
 {
@@ -652,6 +673,7 @@
 		[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
 		[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
+		[NFSD_Suspend] = {"suspend", &suspend_ops, S_IWUSR|S_IRUSR},
 #ifdef CONFIG_NFSD_V4
 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
diff -ru linux-2.6.24.2/include/linux/nfsd/export.h linux-2.6.24.2-nfs.suspend/include/linux/nfsd/export.h
--- linux-2.6.24.2/include/linux/nfsd/export.h	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2-nfs.suspend/include/linux/nfsd/export.h	2008-02-13 12:55:17.000000000 -0800
@@ -125,6 +125,9 @@
 void			nfsd_export_init(void);
 void			nfsd_export_shutdown(void);
 void			nfsd_export_flush(void);
+void			export_purge(void);
+void			exp_writelock(void);
+void			exp_writeunlock(void);
 void			exp_readlock(void);
 void			exp_readunlock(void);
 struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
Only in linux-2.6.24.2-nfs.suspend/include/linux/nfsd: export.h.orig