Btrfs: Use an array of pages in the extent buffers to reduce the cost of find_get_page
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 4ef8bdd..d74a2b3 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -62,6 +62,7 @@
struct list_head list;
};
+#define EXTENT_INLINE_PAGES 32
struct extent_buffer {
u64 start;
unsigned long len;
@@ -69,13 +70,12 @@
int flags;
struct list_head list;
struct list_head leak_list;
- struct page *first_page;
- struct page *last_page;
unsigned long alloc_addr;
char *map_token;
char *kaddr;
unsigned long map_start;
unsigned long map_len;
+ struct page *pages[EXTENT_INLINE_PAGES];
};
typedef struct extent_map *(get_extent_t)(struct inode *inode,