new file mode 100644
--- /dev/null
+++ b/packages/fs/jffs2/current/src/background.c
@@ -0,0 +1,159 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: background.c,v 1.16 2001/10/08 09:22:38 dwmw2 Exp $
+ *
+ */
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/unistd.h>
+#include <linux/jffs2.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include "nodelist.h"
+
+
+static int jffs2_garbage_collect_thread(void *);
+static int thread_should_wake(struct jffs2_sb_info *c);
+
+void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
+{
+	spin_lock_bh(&c->erase_completion_lock);
+        if (c->gc_task && thread_should_wake(c))
+                send_sig(SIGHUP, c->gc_task, 1);
+	spin_unlock_bh(&c->erase_completion_lock);
+}
+
+/* This must only ever be called when no GC thread is currently running */
+int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c)
+{
+	pid_t pid;
+	int ret = 0;
+
+	if (c->gc_task)
+		BUG();
+
+	init_MUTEX_LOCKED(&c->gc_thread_start);
+	init_completion(&c->gc_thread_exit);
+
+	pid = kernel_thread(jffs2_garbage_collect_thread, c, CLONE_FS|CLONE_FILES);
+	if (pid < 0) {
+		printk(KERN_WARNING "fork failed for JFFS2 garbage collect thread: %d\n", -pid);
+		complete(&c->gc_thread_exit);
+		ret = pid;
+	} else {
+		/* Wait for it... */
+		D1(printk(KERN_DEBUG "JFFS2: Garbage collect thread is pid %d\n", pid));
+		down(&c->gc_thread_start);
+	}
+ 
+	return ret;
+}
+
+void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c)
+{
+	spin_lock_bh(&c->erase_completion_lock);
+	if (c->gc_task) {
+		D1(printk(KERN_DEBUG "jffs2: Killing GC task %d\n", c->gc_task->pid));
+		send_sig(SIGKILL, c->gc_task, 1);
+	}
+	spin_unlock_bh(&c->erase_completion_lock);
+	wait_for_completion(&c->gc_thread_exit);
+}
+
+static int jffs2_garbage_collect_thread(void *_c)
+{
+	struct jffs2_sb_info *c = _c;
+
+	daemonize();
+	current->tty = NULL;
+	c->gc_task = current;
+	up(&c->gc_thread_start);
+
+        sprintf(current->comm, "jffs2_gcd_mtd%d", c->mtd->index);
+
+	/* FIXME in the 2.2 backport */
+	current->nice = 10;
+
+	for (;;) {
+		spin_lock_irq(&current->sigmask_lock);
+		siginitsetinv (&current->blocked, sigmask(SIGHUP) | sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
+		recalc_sigpending(current);
+		spin_unlock_irq(&current->sigmask_lock);
+
+		if (!thread_should_wake(c)) {
+                        set_current_state (TASK_INTERRUPTIBLE);
+			D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
+			/* Yes, there's a race here; we checked thread_should_wake() before
+			   setting current->state to TASK_INTERRUPTIBLE. But it doesn't
+			   matter - We don't care if we miss a wakeup, because the GC thread
+			   is only an optimisation anyway. */
+			schedule();
+		}
+                
+		if (current->need_resched)
+			schedule();
+
+                /* Put_super will send a SIGKILL and then wait on the sem. 
+                 */
+                while (signal_pending(current)) {
+                        siginfo_t info;
+                        unsigned long signr;
+
+                        spin_lock_irq(&current->sigmask_lock);
+                        signr = dequeue_signal(&current->blocked, &info);
+                        spin_unlock_irq(&current->sigmask_lock);
+
+                        switch(signr) {
+                        case SIGSTOP:
+                                D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGSTOP received.\n"));
+                                set_current_state(TASK_STOPPED);
+                                schedule();
+                                break;
+
+                        case SIGKILL:
+                                D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGKILL received.\n"));
+				spin_lock_bh(&c->erase_completion_lock);
+                                c->gc_task = NULL;
+				spin_unlock_bh(&c->erase_completion_lock);
+				complete_and_exit(&c->gc_thread_exit, 0);
+
+			case SIGHUP:
+				D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): SIGHUP received.\n"));
+				break;
+			default:
+				D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): signal %ld received\n", signr));
+
+                        }
+                }
+		/* We don't want SIGHUP to interrupt us. STOP and KILL are OK though. */
+		spin_lock_irq(&current->sigmask_lock);
+		siginitsetinv (&current->blocked, sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
+		recalc_sigpending(current);
+		spin_unlock_irq(&current->sigmask_lock);
+
+		D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): pass\n"));
+		jffs2_garbage_collect_pass(c);
+	}
+}
+
+static int thread_should_wake(struct jffs2_sb_info *c)
+{
+	D1(printk(KERN_DEBUG "thread_should_wake(): nr_free_blocks %d, nr_erasing_blocks %d, dirty_size 0x%x\n", 
+		  c->nr_free_blocks, c->nr_erasing_blocks, c->dirty_size));
+	if (c->nr_free_blocks + c->nr_erasing_blocks < JFFS2_RESERVED_BLOCKS_GCTRIGGER &&
+	    c->dirty_size > c->sector_size)
+		return 1;
+	else 
+		return 0;
+}