[JFFS2] Correct handling of JFFS2_FEATURE_RWCOMPAT_COPY nodes.

We should preserve these when we come to garbage collect them, not let
them get erased. Use jffs2_garbage_collect_pristine() for this, and make
sure the summary code copes -- just refrain from writing a summary for any
block which contains a node we don't understand.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/fs/jffs2/summary.c b/fs/jffs2/summary.c
index 95b5bf8f4a99..53a84b468cfe 100644
--- a/fs/jffs2/summary.c
+++ b/fs/jffs2/summary.c
@@ -760,7 +760,14 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
                         }
 #endif
                         default : {
-                                BUG();  /* unknown node in summary information */
+                                if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
+                                    == JFFS2_FEATURE_RWCOMPAT_COPY) {
+                                        dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
+                                                    je16_to_cpu(temp->u.nodetype));
+                                        jffs2_sum_disable_collecting(c->summary);
+                                } else {
+                                        BUG();  /* unknown node in summary information */
+                                }
                         }
                 }