linux-ext4 - [PATCH FOR-STABLE-2.6.27 10/24] ext4: cleanup mballoc header files

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Date:	Tue, 17 Feb 2009 10:58:30 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...nel.org
Cc:	linux-ext4@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH FOR-STABLE-2.6.27 10/24] ext4: cleanup mballoc header files

From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Move some of the forward declaration of the static functions
to mballoc.c where they are used. This enables us to include
mballoc.h in other .c files. Also correct the buddy cache
documentation.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
(cherry picked from commit c3a326a657562dab81acf05aee106dc1fe345eb4)
---
 fs/ext4/mballoc.c |   22 ++++++++++++++++++----
 fs/ext4/mballoc.h |   20 +-------------------
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index ee19c03..103f2c3 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 +330,15 @@
  *        object
  *
  */
+static struct kmem_cache *ext4_pspace_cachep;
+static struct kmem_cache *ext4_ac_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 ext4_mb_free_committed_blocks(struct super_block *);
+static void ext4_mb_poll_new_transaction(struct super_block *sb,
+					 handle_t *handle);
 
 static inline void *mb_correct_addr_and_bit(int *bit, void *addr)
 {
@@ -718,7 +727,7 @@ 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.
@@ -1320,8 +1329,13 @@ 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 ee7c800..0e6a264 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -97,9 +97,6 @@
  */
 #define MB_DEFAULT_GROUP_PREALLOC	512
 
-static struct kmem_cache *ext4_pspace_cachep;
-static struct kmem_cache *ext4_ac_cachep;
-
 #ifdef EXT4_BB_MAX_BLOCKS
 #undef EXT4_BB_MAX_BLOCKS
 #endif
@@ -254,8 +251,6 @@ 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)
@@ -263,19 +258,6 @@ static void ext4_mb_store_history(struct ext4_allocation_context *ac);
 static struct proc_dir_entry *proc_root_ext4;
 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_poll_new_transaction(struct super_block *, handle_t *);
-static void ext4_mb_free_committed_blocks(struct super_block *);
-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 inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
 {
 	struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
@@ -300,7 +282,7 @@ 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;
-- 
1.5.6.3

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