+static void do_thaw_all_callback(struct super_block *sb)
+{
+ down_write(&sb->s_umount);
+ if (sb->s_root && sb->s_flags & MS_BORN) {
+ emergency_thaw_bdev(sb);
+ thaw_super_locked(sb);
+ } else {
+ up_write(&sb->s_umount);
+ }
+}
+
+static void do_thaw_all(struct work_struct *work)
+{
+ __iterate_supers(do_thaw_all_callback);
+ kfree(work);
+ printk(KERN_WARNING "Emergency Thaw complete\n");
+}
+
+/**
+ * emergency_thaw_all -- forcibly thaw every frozen filesystem
+ *
+ * Used for emergency unfreeze of all filesystems via SysRq
+ */
+void emergency_thaw_all(void)
+{
+ struct work_struct *work;
+
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ if (work) {
+ INIT_WORK(work, do_thaw_all);
+ schedule_work(work);
+ }
+}
+