2 files changed, 20 insertions, 21 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d2b1bcaf88ec..c17063ddb307 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -100,7 +100,7 @@
  * inode as:
  *
  *  {                        page                        }
- *  [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ *  [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]...
  *
  *
  * one block each for bitmap and buddy information.  So for each group we
@@ -330,6 +330,16 @@
  *        object
  *
  */
+static struct kmem_cache *ext4_pspace_cachep;
+static struct kmem_cache *ext4_ac_cachep;
+static struct kmem_cache *ext4_free_ext_cachep;
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
+                                        ext4_group_t group);
+static int ext4_mb_init_per_dev_proc(struct super_block *sb);
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
+static void release_blocks_on_commit(journal_t *journal, transaction_t *txn);
+
+
 
 static inline void *mb_correct_addr_and_bit(int *bit, void *addr)
 {
@@ -716,7 +726,7 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
  * stored in the inode as
  *
  * {                        page                        }
- * [ group 0 buddy][ group 0 bitmap] [group 1][ group 1]...
+ * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]...
  *
  *
  * one block each for bitmap and buddy information.
@@ -1322,8 +1332,13 @@ static void ext4_mb_use_best_found(struct ext4_allocation_context *ac,
         ac->ac_tail = ret & 0xffff;
         ac->ac_buddy = ret >> 16;
 
-        /* XXXXXXX: SUCH A HORRIBLE **CK */
-        /*FIXME!! Why ? */
+        /*
+         * take the page reference. We want the page to be pinned
+         * so that we don't get a ext4_mb_init_cache_call for this
+         * group until we update the bitmap. That would mean we
+         * double allocate blocks. The reference is dropped
+         * in ext4_mb_release_context
+         */
         ac->ac_bitmap_page = e4b->bd_bitmap_page;
         get_page(ac->ac_bitmap_page);
         ac->ac_buddy_page = e4b->bd_buddy_page;
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index a931b6b4f6ad..997f78fff129 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -99,9 +99,6 @@
  */
 #define MB_DEFAULT_GROUP_PREALLOC       512
 
-static struct kmem_cache *ext4_pspace_cachep;
-static struct kmem_cache *ext4_ac_cachep;
-static struct kmem_cache *ext4_free_ext_cachep;
 
 struct ext4_free_data {
         /* this links the free block information from group_info */
@@ -262,25 +259,12 @@ static inline void ext4_mb_store_history(struct ext4_allocation_context *ac)
 {
         return;
 }
-#else
-static void ext4_mb_store_history(struct ext4_allocation_context *ac);
 #endif
 
 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
 
 struct buffer_head *read_block_bitmap(struct super_block *, ext4_group_t);
 
-static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
-                                        ext4_group_t group);
-static void ext4_mb_return_to_preallocation(struct inode *inode,
-                                        struct ext4_buddy *e4b, sector_t block,
-                                        int count);
-static void ext4_mb_put_pa(struct ext4_allocation_context *,
-                        struct super_block *, struct ext4_prealloc_space *pa);
-static int ext4_mb_init_per_dev_proc(struct super_block *sb);
-static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
-static void release_blocks_on_commit(journal_t *journal, transaction_t *txn);
-
 
 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
 {
@@ -306,7 +290,7 @@ static inline int ext4_is_group_locked(struct super_block *sb,
                                                 &(grinfo->bb_state));
 }
 
-static ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
+static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
                                         struct ext4_free_extent *fex)
 {
         ext4_fsblk_t block;