[JFFS2] Fix obsoletion of metadata nodes in jffs2_add_tn_to_tree()

We should keep the mdata node with higher version number, not just the
one we happen to find latest. Doh.

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

1 files changed, 10 insertions, 3 deletions

diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 5663e8c7a959..12e83f67eee4 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -229,9 +229,16 @@ static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c,
            check anyway. */
         if (!tn->fn->size) {
                 if (rii->mdata_tn) {
-                        /* We had a candidate mdata node already */
-                        dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version);
-                        jffs2_kill_tn(c, rii->mdata_tn);
+                        if (rii->mdata_tn->version < tn->version) {
+                                /* We had a candidate mdata node already */
+                                dbg_readinode("kill old mdata with ver %d\n", rii->mdata_tn->version);
+                                jffs2_kill_tn(c, rii->mdata_tn);
+                        } else {
+                                dbg_readinode("kill new mdata with ver %d (older than existing %d\n",
+                                              tn->version, rii->mdata_tn->version);
+                                jffs2_kill_tn(c, tn);
+                                return 0;
+                        }
                 }
                 rii->mdata_tn = tn;
                 dbg_readinode("keep new mdata with ver %d\n", tn->version);