Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 140 insertions, 0 deletions

diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
new file mode 100644
index 000000000000..1be6de27dd81
--- /dev/null
+++ b/fs/jffs2/background.c
@@ -0,0 +1,140 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001-2003 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: background.c,v 1.50 2004/11/16 20:36:10 dwmw2 Exp $
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/jffs2.h>
+#include <linux/mtd/mtd.h>
+#include <linux/completion.h>
+#include "nodelist.h"
+
+
+static int jffs2_garbage_collect_thread(void *);
+
+void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c)
+{
+        spin_lock(&c->erase_completion_lock);
+        if (c->gc_task && jffs2_thread_should_wake(c))
+                send_sig(SIGHUP, c->gc_task, 1);
+        spin_unlock(&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(&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(&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("jffs2_gcd_mtd%d", c->mtd->index);
+        allow_signal(SIGKILL);
+        allow_signal(SIGSTOP);
+        allow_signal(SIGCONT);
+
+        c->gc_task = current;
+        up(&c->gc_thread_start);
+
+        set_user_nice(current, 10);
+
+        for (;;) {
+                allow_signal(SIGHUP);
+
+                if (!jffs2_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 jffs2_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 (try_to_freeze(0))
+                        continue;
+
+                cond_resched();
+
+                /* Put_super will send a SIGKILL and then wait on the sem. 
+                 */
+                while (signal_pending(current)) {
+                        siginfo_t info;
+                        unsigned long signr;
+
+                        signr = dequeue_signal_lock(current, &current->blocked, &info);
+
+                        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"));
+                                goto die;
+
+                        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. */
+                disallow_signal(SIGHUP);
+
+                D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread(): pass\n"));
+                if (jffs2_garbage_collect_pass(c) == -ENOSPC) {
+                        printk(KERN_NOTICE "No space for garbage collection. Aborting GC thread\n");
+                        goto die;
+                }
+        }
+ die:
+        spin_lock(&c->erase_completion_lock);
+        c->gc_task = NULL;
+        spin_unlock(&c->erase_completion_lock);
+        complete_and_exit(&c->gc_thread_exit, 0);
+}