1 files changed, 89 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
new file mode 100644
index 000000000000..108944aab4bd
--- /dev/null
+++ b/fs/btrfs/extent_map.h
@@ -0,0 +1,89 @@
+#ifndef __EXTENTMAP__
+#define __EXTENTMAP__
+#include <linux/rbtree.h>
+#define EXTENT_MAP_INLINE (u64)-2
+#define EXTENT_MAP_DELALLOC (u64)-1
+struct extent_map_tree {
+        struct rb_root map;
+        struct rb_root state;
+        struct address_space *mapping;
+        rwlock_t lock;
+};
+/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
+struct extent_map {
+        u64 start;
+        u64 end; /* inclusive */
+        int in_tree;
+        struct rb_node rb_node;
+        /* block_start and block_end are in bytes */
+        u64 block_start;
+        u64 block_end; /* inclusive */
+        struct block_device *bdev;
+        atomic_t refs;
+};
+/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
+struct extent_state {
+        u64 start;
+        u64 end; /* inclusive */
+        int in_tree;
+        struct rb_node rb_node;
+        wait_queue_head_t wq;
+        atomic_t refs;
+        unsigned long state;
+        struct list_head list;
+};
+struct extent_buffer {
+        u64 start;
+        u64 end; /* inclusive */
+        char *addr;
+        struct page *pages[];
+};
+typedef struct extent_map *(get_extent_t)(struct inode *inode,
+                                          struct page *page,
+                                          size_t page_offset,
+                                          u64 start, u64 end,
+                                          int create);
+void extent_map_tree_init(struct extent_map_tree *tree,
+                          struct address_space *mapping, gfp_t mask);
+struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
+                                         u64 start, u64 end);
+int add_extent_mapping(struct extent_map_tree *tree,
+                       struct extent_map *em);
+int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
+int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
+int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
+int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
+struct extent_map *alloc_extent_map(gfp_t mask);
+void free_extent_map(struct extent_map *em);
+int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
+                          get_extent_t *get_extent);
+void __init extent_map_init(void);
+void __exit extent_map_exit(void);
+int extent_clean_all_trees(struct extent_map_tree *tree);
+int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
+                        gfp_t mask);
+int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
+                   gfp_t mask);
+int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
+                     gfp_t mask);
+int extent_invalidatepage(struct extent_map_tree *tree,
+                          struct page *page, unsigned long offset);
+int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
+                          get_extent_t *get_extent,
+                          struct writeback_control *wbc);
+int extent_prepare_write(struct extent_map_tree *tree,
+                         struct inode *inode, struct page *page,
+                         unsigned from, unsigned to, get_extent_t *get_extent);
+int extent_commit_write(struct extent_map_tree *tree,
+                        struct inode *inode, struct page *page,
+                        unsigned from, unsigned to);
+int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
+#endif

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h new file mode 100644 index 000000000000..108944aab4bd --- /dev/null +++ b/fs/btrfs/extent_map.h
@@ -0,0 +1,89 @@
	1	#ifndef __EXTENTMAP__
	2	#define __EXTENTMAP__
	3
	4	#include <linux/rbtree.h>
	5
	6	#define EXTENT_MAP_INLINE (u64)-2
	7	#define EXTENT_MAP_DELALLOC (u64)-1
	8
	9	struct extent_map_tree {
	10	struct rb_root map;
	11	struct rb_root state;
	12	struct address_space *mapping;
	13	rwlock_t lock;
	14	};
	15
	16	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	17	struct extent_map {
	18	u64 start;
	19	u64 end; /* inclusive */
	20	int in_tree;
	21	struct rb_node rb_node;
	22	/* block_start and block_end are in bytes */
	23	u64 block_start;
	24	u64 block_end; /* inclusive */
	25	struct block_device *bdev;
	26	atomic_t refs;
	27	};
	28
	29	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	30	struct extent_state {
	31	u64 start;
	32	u64 end; /* inclusive */
	33	int in_tree;
	34	struct rb_node rb_node;
	35	wait_queue_head_t wq;
	36	atomic_t refs;
	37	unsigned long state;
	38	struct list_head list;
	39	};
	40
	41	struct extent_buffer {
	42	u64 start;
	43	u64 end; /* inclusive */
	44	char *addr;
	45	struct page *pages[];
	46	};
	47
	48	typedef struct extent_map (get_extent_t)(struct inode inode,
	49	struct page *page,
	50	size_t page_offset,
	51	u64 start, u64 end,
	52	int create);
	53
	54	void extent_map_tree_init(struct extent_map_tree *tree,
	55	struct address_space *mapping, gfp_t mask);
	56	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
	57	u64 start, u64 end);
	58	int add_extent_mapping(struct extent_map_tree *tree,
	59	struct extent_map *em);
	60	int remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
	61	int try_release_extent_mapping(struct extent_map_tree tree, struct page page);
	62	int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	63	int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	64	struct extent_map *alloc_extent_map(gfp_t mask);
	65	void free_extent_map(struct extent_map *em);
	66	int extent_read_full_page(struct extent_map_tree tree, struct page page,
	67	get_extent_t *get_extent);
	68	void __init extent_map_init(void);
	69	void __exit extent_map_exit(void);
	70	int extent_clean_all_trees(struct extent_map_tree *tree);
	71	int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
	72	gfp_t mask);
	73	int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
	74	gfp_t mask);
	75	int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
	76	gfp_t mask);
	77	int extent_invalidatepage(struct extent_map_tree *tree,
	78	struct page *page, unsigned long offset);
	79	int extent_write_full_page(struct extent_map_tree tree, struct page page,
	80	get_extent_t *get_extent,
	81	struct writeback_control *wbc);
	82	int extent_prepare_write(struct extent_map_tree *tree,
	83	struct inode inode, struct page page,
	84	unsigned from, unsigned to, get_extent_t *get_extent);
	85	int extent_commit_write(struct extent_map_tree *tree,
	86	struct inode inode, struct page page,
	87	unsigned from, unsigned to);
	88	int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
	89	#endif