[deliverable/linux.git] / fs / btrfs / extent_io.h

#ifndef __EXTENTIO__
#define __EXTENTIO__

#include <linux/rbtree.h>

/* bits for the extent state */
#define EXTENT_DIRTY 1
#define EXTENT_WRITEBACK (1 << 1)
#define EXTENT_UPTODATE (1 << 2)
#define EXTENT_LOCKED (1 << 3)
#define EXTENT_NEW (1 << 4)
#define EXTENT_DELALLOC (1 << 5)
#define EXTENT_DEFRAG (1 << 6)
#define EXTENT_DEFRAG_DONE (1 << 7)
#define EXTENT_BUFFER_FILLED (1 << 8)
#define EXTENT_BOUNDARY (1 << 9)
#define EXTENT_NODATASUM (1 << 10)
#define EXTENT_DO_ACCOUNTING (1 << 11)
#define EXTENT_FIRST_DELALLOC (1 << 12)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)

/* flags for bio submission */
#define EXTENT_BIO_COMPRESSED 1

/* these are bit numbers for test/set bit */
#define EXTENT_BUFFER_UPTODATE 0
#define EXTENT_BUFFER_BLOCKING 1
#define EXTENT_BUFFER_DIRTY 2

/* these are flags for extent_clear_unlock_delalloc */
#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
#define EXTENT_CLEAR_UNLOCK	 0x2
#define EXTENT_CLEAR_DELALLOC	 0x4
#define EXTENT_CLEAR_DIRTY	 0x8
#define EXTENT_SET_WRITEBACK	 0x10
#define EXTENT_END_WRITEBACK	 0x20
#define EXTENT_SET_PRIVATE2	 0x40
#define EXTENT_CLEAR_ACCOUNTING  0x80

/*
 * page->private values.  Every page that is controlled by the extent
 * map has page->private set to one.
 */
#define EXTENT_PAGE_PRIVATE 1
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3

struct extent_state;

typedef	int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
				       struct bio *bio, int mirror_num,
				       unsigned long bio_flags, u64 bio_offset);
struct extent_io_ops {
	int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
			     u64 start, u64 end, int *page_started,
			     unsigned long *nr_written);
	int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
	extent_submit_bio_hook_t *submit_bio_hook;
	int (*merge_bio_hook)(struct page *page, unsigned long offset,
			      size_t size, struct bio *bio,
			      unsigned long bio_flags);
	int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_io_failed_hook)(struct bio *bio, struct page *page,
				       u64 start, u64 end,
				       struct extent_state *state);
	int (*writepage_io_failed_hook)(struct bio *bio, struct page *page,
					u64 start, u64 end,
				       struct extent_state *state);
	int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
				    struct extent_state *state);
	int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
				      struct extent_state *state, int uptodate);
	int (*set_bit_hook)(struct inode *inode, struct extent_state *state,
			    int *bits);
	int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
			      int *bits);
	int (*merge_extent_hook)(struct inode *inode,
				 struct extent_state *new,
				 struct extent_state *other);
	int (*split_extent_hook)(struct inode *inode,
				 struct extent_state *orig, u64 split);
	int (*write_cache_pages_lock_hook)(struct page *page);
};

struct extent_io_tree {
	struct rb_root state;
	struct radix_tree_root buffer;
	struct address_space *mapping;
	u64 dirty_bytes;
	spinlock_t lock;
	spinlock_t buffer_lock;
	struct extent_io_ops *ops;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;

	/* ADD NEW ELEMENTS AFTER THIS */
	struct extent_io_tree *tree;
	wait_queue_head_t wq;
	atomic_t refs;
	unsigned long state;
	u64 split_start;
	u64 split_end;

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

	struct list_head leak_list;
};

struct extent_buffer {
	u64 start;
	unsigned long len;
	char *map_token;
	char *kaddr;
	unsigned long map_start;
	unsigned long map_len;
	struct page *first_page;
	unsigned long bflags;
	atomic_t refs;
	struct list_head leak_list;
	struct rcu_head rcu_head;

	/* the spinlock is used to protect most operations */
	spinlock_t lock;

	/*
	 * when we keep the lock held while blocking, waiters go onto
	 * the wq
	 */
	wait_queue_head_t lock_wq;
};

struct extent_map_tree;

static inline struct extent_state *extent_state_next(struct extent_state *state)
{
	struct rb_node *node;
	node = rb_next(&state->rb_node);
	if (!node)
		return NULL;
	return rb_entry(node, struct extent_state, rb_node);
}

typedef struct extent_map *(get_extent_t)(struct inode *inode,
					  struct page *page,
					  size_t page_offset,
					  u64 start, u64 len,
					  int create);

void extent_io_tree_init(struct extent_io_tree *tree,
			  struct address_space *mapping, gfp_t mask);
int try_release_extent_mapping(struct extent_map_tree *map,
			       struct extent_io_tree *tree, struct page *page,
			       gfp_t mask);
int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page);
int try_release_extent_state(struct extent_map_tree *map,
			     struct extent_io_tree *tree, struct page *page,
			     gfp_t mask);
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		     int bits, struct extent_state **cached, gfp_t mask);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
			 struct extent_state **cached, gfp_t mask);
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
		    gfp_t mask);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent);
int __init extent_io_init(void);
void extent_io_exit(void);

u64 count_range_bits(struct extent_io_tree *tree,
		     u64 *start, u64 search_end,
		     u64 max_bytes, unsigned long bits);

void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int filled, struct extent_state *cached_state);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		      int bits, gfp_t mask);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     int bits, int wake, int delete, struct extent_state **cached,
		     gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		    int bits, gfp_t mask);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int exclusive_bits, u64 *failed_start,
		   struct extent_state **cached_state, gfp_t mask);
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
			gfp_t mask);
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
		   gfp_t mask);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
				  u64 end, gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
			struct extent_state **cached_state, gfp_t mask);
int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, int bits);
struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
						 u64 start, int bits);
int extent_invalidatepage(struct extent_io_tree *tree,
			  struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent,
			  struct writeback_control *wbc);
int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
			      u64 start, u64 end, get_extent_t *get_extent,
			      int mode);
int extent_writepages(struct extent_io_tree *tree,
		      struct address_space *mapping,
		      get_extent_t *get_extent,
		      struct writeback_control *wbc);
int extent_readpages(struct extent_io_tree *tree,
		     struct address_space *mapping,
		     struct list_head *pages, unsigned nr_pages,
		     get_extent_t get_extent);
int extent_prepare_write(struct extent_io_tree *tree,
			 struct inode *inode, struct page *page,
			 unsigned from, unsigned to, get_extent_t *get_extent);
int extent_commit_write(struct extent_io_tree *tree,
			struct inode *inode, struct page *page,
			unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
		get_extent_t *get_extent);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		__u64 start, __u64 len, get_extent_t *get_extent);
int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
					  u64 start, unsigned long len,
					  struct page *page0,
					  gfp_t mask);
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
					 u64 start, unsigned long len,
					  gfp_t mask);
void free_extent_buffer(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_io_tree *tree,
			     struct extent_buffer *eb, u64 start, int wait,
			     get_extent_t *get_extent, int mirror_num);

static inline void extent_buffer_get(struct extent_buffer *eb)
{
	atomic_inc(&eb->refs);
}

int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
			  unsigned long start,
			  unsigned long len);
void read_extent_buffer(struct extent_buffer *eb, void *dst,
			unsigned long start,
			unsigned long len);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
			unsigned long dst_offset, unsigned long src_offset,
			unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
			  unsigned long start, unsigned long len);
int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
				    struct extent_buffer *eb);
int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
int clear_extent_buffer_dirty(struct extent_io_tree *tree,
			      struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_io_tree *tree,
			     struct extent_buffer *eb);
int test_extent_buffer_dirty(struct extent_io_tree *tree,
			     struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
			       struct extent_buffer *eb);
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
				struct extent_buffer *eb,
				struct extent_state **cached_state);
int extent_buffer_uptodate(struct extent_io_tree *tree,
			   struct extent_buffer *eb,
			   struct extent_state *cached_state);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
int release_extent_buffer_tail_pages(struct extent_buffer *eb);
int extent_range_uptodate(struct extent_io_tree *tree,
			  u64 start, u64 end);
int extent_clear_unlock_delalloc(struct inode *inode,
				struct extent_io_tree *tree,
				u64 start, u64 end, struct page *locked_page,
				unsigned long op);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
		gfp_t gfp_flags);
#endif
Commit	Line	Data
	1	#ifndef __EXTENTIO__
	2	#define __EXTENTIO__
	3
	4	#include <linux/rbtree.h>
	5
	6	/* bits for the extent state */
	7	#define EXTENT_DIRTY 1
	8	#define EXTENT_WRITEBACK (1 << 1)
	9	#define EXTENT_UPTODATE (1 << 2)
	10	#define EXTENT_LOCKED (1 << 3)
	11	#define EXTENT_NEW (1 << 4)
	12	#define EXTENT_DELALLOC (1 << 5)
	13	#define EXTENT_DEFRAG (1 << 6)
	14	#define EXTENT_DEFRAG_DONE (1 << 7)
	15	#define EXTENT_BUFFER_FILLED (1 << 8)
	16	#define EXTENT_BOUNDARY (1 << 9)
	17	#define EXTENT_NODATASUM (1 << 10)
	18	#define EXTENT_DO_ACCOUNTING (1 << 11)
	19	#define EXTENT_FIRST_DELALLOC (1 << 12)
	20	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	21	#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING \| EXTENT_FIRST_DELALLOC)
	22
	23	/* flags for bio submission */
	24	#define EXTENT_BIO_COMPRESSED 1
	25
	26	/* these are bit numbers for test/set bit */
	27	#define EXTENT_BUFFER_UPTODATE 0
	28	#define EXTENT_BUFFER_BLOCKING 1
	29	#define EXTENT_BUFFER_DIRTY 2
	30
	31	/* these are flags for extent_clear_unlock_delalloc */
	32	#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
	33	#define EXTENT_CLEAR_UNLOCK 0x2
	34	#define EXTENT_CLEAR_DELALLOC 0x4
	35	#define EXTENT_CLEAR_DIRTY 0x8
	36	#define EXTENT_SET_WRITEBACK 0x10
	37	#define EXTENT_END_WRITEBACK 0x20
	38	#define EXTENT_SET_PRIVATE2 0x40
	39	#define EXTENT_CLEAR_ACCOUNTING 0x80
	40
	41	/*
	42	* page->private values. Every page that is controlled by the extent
	43	* map has page->private set to one.
	44	*/
	45	#define EXTENT_PAGE_PRIVATE 1
	46	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	47
	48	struct extent_state;
	49
	50	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
	51	struct bio *bio, int mirror_num,
	52	unsigned long bio_flags, u64 bio_offset);
	53	struct extent_io_ops {
	54	int (fill_delalloc)(struct inode inode, struct page *locked_page,
	55	u64 start, u64 end, int *page_started,
	56	unsigned long *nr_written);
	57	int (writepage_start_hook)(struct page page, u64 start, u64 end);
	58	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	59	extent_submit_bio_hook_t *submit_bio_hook;
	60	int (merge_bio_hook)(struct page page, unsigned long offset,
	61	size_t size, struct bio *bio,
	62	unsigned long bio_flags);
	63	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	64	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	65	u64 start, u64 end,
	66	struct extent_state *state);
	67	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	68	u64 start, u64 end,
	69	struct extent_state *state);
	70	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
	71	struct extent_state *state);
	72	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
	73	struct extent_state *state, int uptodate);
	74	int (set_bit_hook)(struct inode inode, struct extent_state *state,
	75	int *bits);
	76	int (clear_bit_hook)(struct inode inode, struct extent_state *state,
	77	int *bits);
	78	int (merge_extent_hook)(struct inode inode,
	79	struct extent_state *new,
	80	struct extent_state *other);
	81	int (split_extent_hook)(struct inode inode,
	82	struct extent_state *orig, u64 split);
	83	int (write_cache_pages_lock_hook)(struct page page);
	84	};
	85
	86	struct extent_io_tree {
	87	struct rb_root state;
	88	struct radix_tree_root buffer;
	89	struct address_space *mapping;
	90	u64 dirty_bytes;
	91	spinlock_t lock;
	92	spinlock_t buffer_lock;
	93	struct extent_io_ops *ops;
	94	};
	95
	96	struct extent_state {
	97	u64 start;
	98	u64 end; /* inclusive */
	99	struct rb_node rb_node;
	100
	101	/* ADD NEW ELEMENTS AFTER THIS */
	102	struct extent_io_tree *tree;
	103	wait_queue_head_t wq;
	104	atomic_t refs;
	105	unsigned long state;
	106	u64 split_start;
	107	u64 split_end;
	108
	109	/* for use by the FS */
	110	u64 private;
	111
	112	struct list_head leak_list;
	113	};
	114
	115	struct extent_buffer {
	116	u64 start;
	117	unsigned long len;
	118	char *map_token;
	119	char *kaddr;
	120	unsigned long map_start;
	121	unsigned long map_len;
	122	struct page *first_page;
	123	unsigned long bflags;
	124	atomic_t refs;
	125	struct list_head leak_list;
	126	struct rcu_head rcu_head;
	127
	128	/* the spinlock is used to protect most operations */
	129	spinlock_t lock;
	130
	131	/*
	132	* when we keep the lock held while blocking, waiters go onto
	133	* the wq
	134	*/
	135	wait_queue_head_t lock_wq;
	136	};
	137
	138	struct extent_map_tree;
	139
	140	static inline struct extent_state extent_state_next(struct extent_state state)
	141	{
	142	struct rb_node *node;
	143	node = rb_next(&state->rb_node);
	144	if (!node)
	145	return NULL;
	146	return rb_entry(node, struct extent_state, rb_node);
	147	}
	148
	149	typedef struct extent_map (get_extent_t)(struct inode inode,
	150	struct page *page,
	151	size_t page_offset,
	152	u64 start, u64 len,
	153	int create);
	154
	155	void extent_io_tree_init(struct extent_io_tree *tree,
	156	struct address_space *mapping, gfp_t mask);
	157	int try_release_extent_mapping(struct extent_map_tree *map,
	158	struct extent_io_tree tree, struct page page,
	159	gfp_t mask);
	160	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
	161	int try_release_extent_state(struct extent_map_tree *map,
	162	struct extent_io_tree tree, struct page page,
	163	gfp_t mask);
	164	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	165	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	166	int bits, struct extent_state **cached, gfp_t mask);
	167	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	168	int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
	169	struct extent_state **cached, gfp_t mask);
	170	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
	171	gfp_t mask);
	172	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	173	get_extent_t *get_extent);
	174	int __init extent_io_init(void);
	175	void extent_io_exit(void);
	176
	177	u64 count_range_bits(struct extent_io_tree *tree,
	178	u64 *start, u64 search_end,
	179	u64 max_bytes, unsigned long bits);
	180
	181	void free_extent_state(struct extent_state *state);
	182	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	183	int bits, int filled, struct extent_state *cached_state);
	184	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	185	int bits, gfp_t mask);
	186	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
	187	int bits, int wake, int delete, struct extent_state **cached,
	188	gfp_t mask);
	189	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	190	int bits, gfp_t mask);
	191	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
	192	int bits, int exclusive_bits, u64 *failed_start,
	193	struct extent_state **cached_state, gfp_t mask);
	194	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	195	gfp_t mask);
	196	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	197	gfp_t mask);
	198	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	199	gfp_t mask);
	200	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	201	gfp_t mask);
	202	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	203	gfp_t mask);
	204	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	205	u64 end, gfp_t mask);
	206	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
	207	struct extent_state **cached_state, gfp_t mask);
	208	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	209	gfp_t mask);
	210	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
	211	u64 start_ret, u64 end_ret, int bits);
	212	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
	213	u64 start, int bits);
	214	int extent_invalidatepage(struct extent_io_tree *tree,
	215	struct page *page, unsigned long offset);
	216	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	217	get_extent_t *get_extent,
	218	struct writeback_control *wbc);
	219	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	220	u64 start, u64 end, get_extent_t *get_extent,
	221	int mode);
	222	int extent_writepages(struct extent_io_tree *tree,
	223	struct address_space *mapping,
	224	get_extent_t *get_extent,
	225	struct writeback_control *wbc);
	226	int extent_readpages(struct extent_io_tree *tree,
	227	struct address_space *mapping,
	228	struct list_head *pages, unsigned nr_pages,
	229	get_extent_t get_extent);
	230	int extent_prepare_write(struct extent_io_tree *tree,
	231	struct inode inode, struct page page,
	232	unsigned from, unsigned to, get_extent_t *get_extent);
	233	int extent_commit_write(struct extent_io_tree *tree,
	234	struct inode inode, struct page page,
	235	unsigned from, unsigned to);
	236	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	237	get_extent_t *get_extent);
	238	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
	239	__u64 start, __u64 len, get_extent_t *get_extent);
	240	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	241	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	242	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	243	void set_page_extent_mapped(struct page *page);
	244
	245	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	246	u64 start, unsigned long len,
	247	struct page *page0,
	248	gfp_t mask);
	249	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	250	u64 start, unsigned long len,
	251	gfp_t mask);
	252	void free_extent_buffer(struct extent_buffer *eb);
	253	int read_extent_buffer_pages(struct extent_io_tree *tree,
	254	struct extent_buffer *eb, u64 start, int wait,
	255	get_extent_t *get_extent, int mirror_num);
	256
	257	static inline void extent_buffer_get(struct extent_buffer *eb)
	258	{
	259	atomic_inc(&eb->refs);
	260	}
	261
	262	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	263	unsigned long start,
	264	unsigned long len);
	265	void read_extent_buffer(struct extent_buffer eb, void dst,
	266	unsigned long start,
	267	unsigned long len);
	268	void write_extent_buffer(struct extent_buffer eb, const void src,
	269	unsigned long start, unsigned long len);
	270	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	271	unsigned long dst_offset, unsigned long src_offset,
	272	unsigned long len);
	273	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	274	unsigned long src_offset, unsigned long len);
	275	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	276	unsigned long src_offset, unsigned long len);
	277	void memset_extent_buffer(struct extent_buffer *eb, char c,
	278	unsigned long start, unsigned long len);
	279	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	280	struct extent_buffer *eb);
	281	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
	282	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
	283	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	284	struct extent_buffer *eb);
	285	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	286	struct extent_buffer *eb);
	287	int test_extent_buffer_dirty(struct extent_io_tree *tree,
	288	struct extent_buffer *eb);
	289	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	290	struct extent_buffer *eb);
	291	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
	292	struct extent_buffer *eb,
	293	struct extent_state **cached_state);
	294	int extent_buffer_uptodate(struct extent_io_tree *tree,
	295	struct extent_buffer *eb,
	296	struct extent_state *cached_state);
	297	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	298	unsigned long min_len, char token, char map,
	299	unsigned long *map_start,
	300	unsigned long *map_len, int km);
	301	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	302	unsigned long min_len, char token, char map,
	303	unsigned long *map_start,
	304	unsigned long *map_len, int km);
	305	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
	306	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	307	int extent_range_uptodate(struct extent_io_tree *tree,
	308	u64 start, u64 end);
	309	int extent_clear_unlock_delalloc(struct inode *inode,
	310	struct extent_io_tree *tree,
	311	u64 start, u64 end, struct page *locked_page,
	312	unsigned long op);
	313	struct bio *
	314	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	315	gfp_t gfp_flags);
	316	#endif