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-rw-r--r--fs/ext4/mballoc.c23
-rw-r--r--fs/ext4/mballoc.h18
2 files changed, 20 insertions, 21 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d2b1bca..c17063d 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 a931b6b..997f78f 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;
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