1 files changed, 25 insertions, 1 deletions

diff --git a/fs/jffs2/nodelist.c b/fs/jffs2/nodelist.c
index 7997f526c94b..0cf5e6f11989 100644
--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.c,v 1.102 2005/07/28 12:45:10 dedekind Exp $
+ * $Id: nodelist.c,v 1.103 2005/07/31 08:20:44 dedekind Exp $
  *
  */
 
@@ -51,6 +51,30 @@ void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new
         *prev = new;
 }
 
+void jffs2_truncate_fragtree(struct jffs2_sb_info *c, struct rb_root *list, uint32_t size)
+{
+        struct jffs2_node_frag *frag = jffs2_lookup_node_frag(list, size);
+
+        JFFS2_DBG_FRAGTREE("truncating fragtree to 0x%08x bytes\n", size);
+
+        /* We know frag->ofs <= size. That's what lookup does for us */
+        if (frag && frag->ofs != size) {
+                if (frag->ofs+frag->size >= size) {
+                        JFFS2_DBG_FRAGTREE2("truncating frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
+                        frag->size = size - frag->ofs;
+                }
+                frag = frag_next(frag);
+        }
+        while (frag && frag->ofs >= size) {
+                struct jffs2_node_frag *next = frag_next(frag);
+
+                JFFS2_DBG_FRAGTREE("removing frag 0x%08x-0x%08x\n", frag->ofs, frag->ofs+frag->size);
+                frag_erase(frag, list);
+                jffs2_obsolete_node_frag(c, frag);
+                frag = next;
+        }
+}
+
 void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
 {
         if (this->node) {