[PATCH] kthreads hold files open

keventd and friends are currently holding /dev/console open three times.
It's all inherited from init.

Steal the relevant parts of daemonize() to fix that up.

kernel/kthread.c

@@ -10,6 +10,7 @@
 #include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/unistd.h>
+#include <linux/file.h>
 #include <asm/semaphore.h>
 
 struct kthread_create_info
@@ -41,6 +42,21 @@ int kthread_should_stop(void)
 	return (kthread_stop_info.k == current);
 }
 
+
+static void kthread_exit_files(void)
+{
+	struct fs_struct *fs;
+	struct task_struct *tsk = current;
+
+	exit_fs(tsk);		/* current->fs->count--; */
+	fs = init_task.fs;
+	tsk->fs = fs;
+	atomic_inc(&fs->count);
+ 	exit_files(tsk);
+	current->files = init_task.files;
+	atomic_inc(&tsk->files->count);
+}
+
 static int kthread(void *_create)
 {
 	struct kthread_create_info *create = _create;
@@ -50,6 +66,8 @@ static int kthread(void *_create)
 	int ret = -EINTR;
 	cpumask_t mask = CPU_MASK_ALL;
 
+	kthread_exit_files();
+
 	/* Copy data: it's on keventd's stack */
 	threadfn = create->threadfn;
 	data = create->data;