[JFFS2] Add some preemptive BUG checks for XATTR code

In a couple of places, we assume that what's at the end of the
->next_in_ino list is a struct jffs2_inode_cache. Let's check
for that, since we expect it to change soon.

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

2 files changed, 5 insertions, 0 deletions

diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
index 0fc19a2fb5d9..4616fed75730 100644
--- a/fs/jffs2/erase.c
+++ b/fs/jffs2/erase.c
@@ -230,6 +230,7 @@ static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
                            at the end of the linked list. Stash it and continue
                            from the beginning of the list */
                         ic = (struct jffs2_inode_cache *)(*prev);
+                        BUG_ON(ic->class != RAWNODE_CLASS_INODE_CACHE);
                         prev = &ic->nodes;
                         continue;
                 }
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index e10e58eab8e5..34a452bdde05 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -661,6 +661,10 @@ void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
                 spin_lock(&c->erase_completion_lock);
 
                 ic = jffs2_raw_ref_to_ic(ref);
+                /* It seems we should never call jffs2_mark_node_obsolete() for
+                   XATTR nodes.... yet. Make sure we notice if/when we change
+                   that :) */
+                BUG_ON(ic->class != RAWNODE_CLASS_INODE_CACHE);
                 for (p = &ic->nodes; (*p) != ref; p = &((*p)->next_in_ino))
                         ;