[linux-2.6-block.git] / fs / btrfs / extent_map.h

#ifndef __EXTENTMAP__
#define __EXTENTMAP__

#include <linux/rbtree.h>

#define EXTENT_MAP_INLINE (u64)-2
#define EXTENT_MAP_DELALLOC (u64)-1

struct extent_map_ops {
	int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
};

struct extent_map_tree {
	struct rb_root map;
	struct rb_root state;
	struct address_space *mapping;
	rwlock_t lock;
	struct extent_map_ops *ops;
};

/* 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;

	/* for use by the FS */
	u64 private;

	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 set_extent_delalloc(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);
int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
#endif
Commit	Line	Data
a52d9a80 CM	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
07157aac CM	9	struct extent_map_ops {
	10	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	11	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	12	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	13	int (readpage_end_io_hook)(struct page page, u64 start, u64 end);
	14	};
	15
a52d9a80 CM	16	struct extent_map_tree {
	17	struct rb_root map;
	18	struct rb_root state;
	19	struct address_space *mapping;
	20	rwlock_t lock;
07157aac	21	struct extent_map_ops *ops;
a52d9a80 CM	22	};
	23
	24	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	25	struct extent_map {
	26	u64 start;
	27	u64 end; /* inclusive */
	28	int in_tree;
	29	struct rb_node rb_node;
	30	/* block_start and block_end are in bytes */
	31	u64 block_start;
	32	u64 block_end; /* inclusive */
	33	struct block_device *bdev;
	34	atomic_t refs;
	35	};
	36
	37	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	38	struct extent_state {
	39	u64 start;
	40	u64 end; /* inclusive */
	41	int in_tree;
	42	struct rb_node rb_node;
	43	wait_queue_head_t wq;
	44	atomic_t refs;
	45	unsigned long state;
07157aac CM	46
	47	/* for use by the FS */
	48	u64 private;
	49
a52d9a80 CM	50	struct list_head list;
	51	};
	52
	53	struct extent_buffer {
	54	u64 start;
	55	u64 end; /* inclusive */
	56	char *addr;
	57	struct page *pages[];
	58	};
	59
	60	typedef struct extent_map (get_extent_t)(struct inode inode,
	61	struct page *page,
	62	size_t page_offset,
	63	u64 start, u64 end,
	64	int create);
	65
	66	void extent_map_tree_init(struct extent_map_tree *tree,
	67	struct address_space *mapping, gfp_t mask);
	68	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
	69	u64 start, u64 end);
	70	int add_extent_mapping(struct extent_map_tree *tree,
	71	struct extent_map *em);
	72	int remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
	73	int try_release_extent_mapping(struct extent_map_tree tree, struct page page);
	74	int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	75	int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	76	struct extent_map *alloc_extent_map(gfp_t mask);
	77	void free_extent_map(struct extent_map *em);
	78	int extent_read_full_page(struct extent_map_tree tree, struct page page,
	79	get_extent_t *get_extent);
	80	void __init extent_map_init(void);
	81	void __exit extent_map_exit(void);
	82	int extent_clean_all_trees(struct extent_map_tree *tree);
	83	int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
	84	gfp_t mask);
	85	int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
	86	gfp_t mask);
	87	int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
	88	gfp_t mask);
b888db2b CM	89	int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
b888db2b CM	90	gfp_t mask);
a52d9a80 CM	91	int extent_invalidatepage(struct extent_map_tree *tree,
	92	struct page *page, unsigned long offset);
	93	int extent_write_full_page(struct extent_map_tree tree, struct page page,
	94	get_extent_t *get_extent,
	95	struct writeback_control *wbc);
	96	int extent_prepare_write(struct extent_map_tree *tree,
	97	struct inode inode, struct page page,
	98	unsigned from, unsigned to, get_extent_t *get_extent);
	99	int extent_commit_write(struct extent_map_tree *tree,
	100	struct inode inode, struct page page,
	101	unsigned from, unsigned to);
	102	int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
07157aac CM	103	int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
07157aac CM	104	int get_state_private(struct extent_map_tree tree, u64 start, u64 private);
a52d9a80	105	#endif