--- /dev/null	2006-05-22 07:25:23.000000000 -0700
+++ linux-2.6.19.2/fs/pipe-cr-debug.c	2007-01-22 15:39:05.000000000 -0800
@@ -0,0 +1,115 @@
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pipe_fs_i.h>
+#include <linux/uio.h>
+
+#include <linux/device.h>
+
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <linux/cr.h>
+
+static struct class *crctl_class;
+
+#define	CRCTL_MAJOR	200
+#define	CRCTL_NAME	"crctl"
+
+extern int ckpoint_pipe(struct file *filp, struct cr_pipe *img);
+extern int restore_pipe(int *fd, struct cr_pipe *img);
+
+
+static int cr_open(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+
+static int cr_release(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+
+static int crctl_ioctl(struct inode *pino, struct file *filp,
+	   unsigned int cmd, unsigned long arg)
+{
+	int fd[2];
+	struct mig_arg {
+		void    *arg1;
+		void    *arg2;
+	} i;
+
+	switch(cmd) {
+		case 246:
+		{
+			struct file *pipefp;
+			int r, fput;
+
+			if (copy_from_user (&i, (void __user *) arg,
+				sizeof(i))) return -EFAULT;
+			pipefp = fget_light((int) i.arg1, &fput);
+			r = ckpoint_pipe(pipefp, (struct cr_pipe *) i.arg2);
+			fput_light(pipefp, fput);
+			return r;
+		}
+		case 245:
+			if (copy_from_user(&i, (void __user *) arg,
+				sizeof(i))) return -EFAULT;
+			if (copy_from_user(fd, (void __user *) i.arg1,
+				sizeof(int) * 2)) return -EFAULT;
+			return restore_pipe(fd, (struct cr_pipe *) i.arg2);
+	}
+	return 0;
+}
+
+static struct file_operations crctl_fops = {
+	.open		= cr_open,
+	.release	= cr_release,
+	.ioctl		= crctl_ioctl,
+};
+
+static void __exit crctl_exit(void)
+{
+	class_device_destroy(crctl_class, MKDEV(CRCTL_MAJOR, 0));
+	class_destroy(crctl_class);
+	unregister_chrdev(CRCTL_MAJOR, CRCTL_NAME);
+}
+
+static int __init crctl_init(void)
+{
+	int ret;
+	struct class_device *class_err;
+
+	ret = register_chrdev(CRCTL_MAJOR, CRCTL_NAME, &crctl_fops);
+	if (ret < 0)
+		goto out;
+
+	crctl_class = class_create(THIS_MODULE, "crctl");
+	if (IS_ERR(crctl_class)) {
+		ret = PTR_ERR(crctl_class);
+		goto out_cleandev;
+	}
+
+	class_err = class_device_create(crctl_class, NULL,
+		MKDEV(CRCTL_MAJOR, 0), NULL, CRCTL_NAME);
+	if (IS_ERR(class_err)) {
+		ret = PTR_ERR(class_err);
+		goto out_rmclass;
+	}
+	goto out;
+
+out_rmclass:
+	class_destroy(crctl_class);
+out_cleandev:
+	unregister_chrdev(CRCTL_MAJOR, CRCTL_NAME);
+out:
+	return ret;
+}
+
+fs_initcall(crctl_init);
+module_exit(crctl_exit);
--- linux-2.6.19.2/fs/Makefile.original	2007-01-10 11:10:37.000000000 -0800
+++ linux-2.6.19.2/fs/Makefile	2007-01-22 15:13:59.000000000 -0800
@@ -10,7 +10,7 @@ obj-y :=	open.o read_write.o file_table.
 		ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
 		attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
 		seq_file.o xattr.o libfs.o fs-writeback.o \
-		pnode.o drop_caches.o splice.o sync.o utimes.o
+		pnode.o drop_caches.o splice.o sync.o utimes.o pipe-cr-debug.o
 
 ifeq ($(CONFIG_BLOCK),y)
 obj-y +=	buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o