[JFFS2] When retiring nextblock, allocate a node_ref for the wasted space

Failing to do so makes the calculated length of the last node incorrect,
when we're not using eraseblock summaries.

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

1 files changed, 22 insertions, 4 deletions

diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index 71d1630609a5..8bedfd2ff689 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -317,6 +317,8 @@ static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
                 }
         } else {
                 if (jeb && minsize > jeb->free_size) {
+                        uint32_t waste;
+
                         /* Skip the end of this block and file it as having some dirty space */
                         /* If there's a pending write to it, flush now */
 
@@ -329,10 +331,26 @@ static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
                                 goto restart;
                         }
 
-                        c->wasted_size += jeb->free_size;
-                        c->free_size -= jeb->free_size;
-                        jeb->wasted_size += jeb->free_size;
-                        jeb->free_size = 0;
+                        spin_unlock(&c->erase_completion_lock);
+
+                        ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
+                        if (ret)
+                                return ret;
+                        /* Just lock it again and continue. Nothing much can change because
+                           we hold c->alloc_sem anyway. In fact, it's not entirely clear why
+                           we hold c->erase_completion_lock in the majority of this function...
+                           but that's a question for another (more caffeine-rich) day. */
+                        spin_lock(&c->erase_completion_lock);
+
+                        waste = jeb->free_size;
+                        jffs2_link_node_ref(c, jeb,
+                                            (jeb->offset + c->sector_size - waste) | REF_OBSOLETE,
+                                            waste, NULL);
+                        /* FIXME: that made it count as dirty. Convert to wasted */
+                        jeb->dirty_size -= waste;
+                        c->dirty_size -= waste;
+                        jeb->wasted_size += waste;
+                        c->wasted_size += waste;
 
                         jffs2_close_nextblock(c, jeb);
                         jeb = NULL;