[JFFS2] Fix race in garbage collector

Fix the race problem described here:
http://lists.infradead.org/pipermail/linux-mtd/2005-April/012361.html

Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
index 57f675c2c97f..a65539f28b06 100644
--- a/fs/jffs2/nodelist.h
+++ b/fs/jffs2/nodelist.h
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.h,v 1.128 2005/02/27 23:01:32 dwmw2 Exp $
+ * $Id: nodelist.h,v 1.130 2005/04/09 10:46:59 dedekind Exp $
  *
  */
 
@@ -363,6 +363,18 @@ static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
                 node = node->rb_left;
         return rb_entry(node, struct jffs2_node_frag, rb);
 }
+
+static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
+{
+        struct rb_node *node = root->rb_node;
+
+        if (!node)
+                return NULL;
+        while(node->rb_right)
+                node = node->rb_right;
+        return rb_entry(node, struct jffs2_node_frag, rb);
+}
+
 #define rb_parent(rb) ((rb)->rb_parent)
 #define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb)
 #define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb)