When a fs is frozen, a process can hang because we wait in
uniterruptible state. We give the user the possibility to kill the process.

Not-signed-off-by: Marco Stornelli <marco.storne...@gmail.com>
---

--- fs/super.c.orig     2013-03-24 09:56:33.000000000 +0100
+++ fs/super.c  2013-03-24 09:58:41.000000000 +0100
@@ -1198,7 +1198,7 @@ retry:
        if (unlikely(sb->s_writers.frozen >= level)) {
                if (!wait)
                        return 0;
-               wait_event(sb->s_writers.wait_unfrozen,
+               wait_event_killable(sb->s_writers.wait_unfrozen,
                           sb->s_writers.frozen < level);
        }
 
@@ -1248,7 +1248,7 @@ static void sb_wait_write(struct super_b
                 * of frozen and checking of the counter
                 */
                prepare_to_wait(&sb->s_writers.wait, &wait,
-                               TASK_UNINTERRUPTIBLE);
+                                TASK_KILLABLE);
 
                writers = percpu_counter_sum(&sb->s_writers.counter[level-1]);
                if (writers)
--
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