[linux-2.6-block.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_ORDERED (1 << 9)
#define EXTENT_ORDERED_METADATA (1 << 10)
#define EXTENT_BOUNDARY (1 << 11)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)

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

/*
 * 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);
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, u64 start, u64 end,
			    unsigned long old, unsigned long bits);
	int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
			    unsigned long old, unsigned long bits);
	int (*write_cache_pages_lock_hook)(struct page *page);
};

struct extent_io_tree {
	struct rb_root state;
	struct rb_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;
	struct extent_io_tree *tree;
	wait_queue_head_t wq;
	atomic_t refs;
	unsigned long state;

	/* 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;
	atomic_t refs;
	int flags;
	struct list_head leak_list;
	struct rb_node rb_node;
	struct mutex mutex;
};

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 unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, 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);

int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int filled);
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, gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		    int bits, 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,
		     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 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 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);
int extent_buffer_uptodate(struct extent_io_tree *tree,
			   struct extent_buffer *eb);
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,
				int unlock_page,
				int clear_unlock,
				int clear_delalloc, int clear_dirty,
				int set_writeback,
				int end_writeback);
#endif
Commit	Line	Data
d1310b2e CM	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)
e6dcd2dc CM	16	#define EXTENT_ORDERED (1 << 9)
e6dcd2dc CM	17	#define EXTENT_ORDERED_METADATA (1 << 10)
5b21f2ed	18	#define EXTENT_BOUNDARY (1 << 11)
d1310b2e CM	19	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
d1310b2e CM	20
c8b97818 CM	21	/* flags for bio submission */
	22	#define EXTENT_BIO_COMPRESSED 1
	23
d1310b2e CM	24	/*
	25	* page->private values. Every page that is controlled by the extent
	26	* map has page->private set to one.
	27	*/
	28	#define EXTENT_PAGE_PRIVATE 1
	29	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	30
70dec807 CM	31	struct extent_state;
70dec807 CM	32
44b8bd7e	33	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818 CM	34	struct bio *bio, int mirror_num,
c8b97818 CM	35	unsigned long bio_flags);
d1310b2e	36	struct extent_io_ops {
c8b97818	37	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	38	u64 start, u64 end, int *page_started,
771ed689 CM	39	unsigned long *nr_written);
247e743c	40	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	41	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	42	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3	43	int (merge_bio_hook)(struct page page, unsigned long offset,
c8b97818 CM	44	size_t size, struct bio *bio,
c8b97818 CM	45	unsigned long bio_flags);
d1310b2e	46	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	47	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	48	u64 start, u64 end,
	49	struct extent_state *state);
1259ab75 CM	50	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	51	u64 start, u64 end,
	52	struct extent_state *state);
70dec807 CM	53	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	54	struct extent_state *state);
1259ab75	55	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	56	struct extent_state *state, int uptodate);
291d673e	57	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	58	unsigned long old, unsigned long bits);
291d673e	59	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	60	unsigned long old, unsigned long bits);
4bef0848	61	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	62	};
	63
	64	struct extent_io_tree {
	65	struct rb_root state;
6af118ce	66	struct rb_root buffer;
d1310b2e CM	67	struct address_space *mapping;
d1310b2e CM	68	u64 dirty_bytes;
70dec807	69	spinlock_t lock;
6af118ce	70	spinlock_t buffer_lock;
d1310b2e	71	struct extent_io_ops *ops;
d1310b2e CM	72	};
	73
	74	struct extent_state {
	75	u64 start;
	76	u64 end; /* inclusive */
d1310b2e	77	struct rb_node rb_node;
70dec807	78	struct extent_io_tree *tree;
d1310b2e CM	79	wait_queue_head_t wq;
	80	atomic_t refs;
	81	unsigned long state;
	82
	83	/* for use by the FS */
	84	u64 private;
	85
2d2ae547	86	struct list_head leak_list;
d1310b2e CM	87	};
	88
	89	struct extent_buffer {
	90	u64 start;
	91	unsigned long len;
	92	char *map_token;
	93	char *kaddr;
	94	unsigned long map_start;
	95	unsigned long map_len;
	96	struct page *first_page;
d1310b2e CM	97	atomic_t refs;
d1310b2e CM	98	int flags;
2d2ae547	99	struct list_head leak_list;
6af118ce	100	struct rb_node rb_node;
a61e6f29	101	struct mutex mutex;
d1310b2e CM	102	};
	103
	104	struct extent_map_tree;
	105
d7fc640e CM	106	static inline struct extent_state extent_state_next(struct extent_state state)
	107	{
	108	struct rb_node *node;
	109	node = rb_next(&state->rb_node);
	110	if (!node)
	111	return NULL;
	112	return rb_entry(node, struct extent_state, rb_node);
	113	}
	114
d1310b2e CM	115	typedef struct extent_map (get_extent_t)(struct inode inode,
	116	struct page *page,
	117	size_t page_offset,
	118	u64 start, u64 len,
	119	int create);
	120
	121	void extent_io_tree_init(struct extent_io_tree *tree,
	122	struct address_space *mapping, gfp_t mask);
d1310b2e	123	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	124	struct extent_io_tree tree, struct page page,
70dec807 CM	125	gfp_t mask);
6af118ce	126	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	127	int try_release_extent_state(struct extent_map_tree *map,
	128	struct extent_io_tree tree, struct page page,
	129	gfp_t mask);
d1310b2e CM	130	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
d1310b2e CM	131	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
25179201 JB	132	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
25179201 JB	133	gfp_t mask);
d1310b2e CM	134	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	135	get_extent_t *get_extent);
	136	int __init extent_io_init(void);
	137	void extent_io_exit(void);
	138
	139	u64 count_range_bits(struct extent_io_tree *tree,
	140	u64 *start, u64 search_end,
	141	u64 max_bytes, unsigned long bits);
	142
	143	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	144	int bits, int filled);
	145	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	146	int bits, gfp_t mask);
e6dcd2dc CM	147	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	148	int bits, int wake, int delete, gfp_t mask);
d1310b2e CM	149	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	150	int bits, gfp_t mask);
	151	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	152	gfp_t mask);
	153	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	154	gfp_t mask);
	155	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	156	gfp_t mask);
	157	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	158	gfp_t mask);
e6dcd2dc CM	159	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	160	gfp_t mask);
	161	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	162	u64 end, gfp_t mask);
d1310b2e CM	163	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	164	gfp_t mask);
e6dcd2dc CM	165	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	166	gfp_t mask);
d1310b2e CM	167	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	168	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	169	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	170	u64 start, int bits);
d1310b2e CM	171	int extent_invalidatepage(struct extent_io_tree *tree,
	172	struct page *page, unsigned long offset);
	173	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	174	get_extent_t *get_extent,
	175	struct writeback_control *wbc);
771ed689 CM	176	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	177	u64 start, u64 end, get_extent_t *get_extent,
	178	int mode);
d1310b2e CM	179	int extent_writepages(struct extent_io_tree *tree,
	180	struct address_space *mapping,
	181	get_extent_t *get_extent,
	182	struct writeback_control *wbc);
	183	int extent_readpages(struct extent_io_tree *tree,
	184	struct address_space *mapping,
	185	struct list_head *pages, unsigned nr_pages,
	186	get_extent_t get_extent);
	187	int extent_prepare_write(struct extent_io_tree *tree,
	188	struct inode inode, struct page page,
	189	unsigned from, unsigned to, get_extent_t *get_extent);
	190	int extent_commit_write(struct extent_io_tree *tree,
	191	struct inode inode, struct page page,
	192	unsigned from, unsigned to);
	193	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	194	get_extent_t *get_extent);
	195	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	196	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	197	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	198	void set_page_extent_mapped(struct page *page);
	199
	200	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	201	u64 start, unsigned long len,
	202	struct page *page0,
	203	gfp_t mask);
	204	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	205	u64 start, unsigned long len,
	206	gfp_t mask);
	207	void free_extent_buffer(struct extent_buffer *eb);
	208	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	209	struct extent_buffer *eb, u64 start, int wait,
f188591e	210	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	211
	212	static inline void extent_buffer_get(struct extent_buffer *eb)
	213	{
	214	atomic_inc(&eb->refs);
	215	}
	216
	217	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	218	unsigned long start,
	219	unsigned long len);
	220	void read_extent_buffer(struct extent_buffer eb, void dst,
	221	unsigned long start,
	222	unsigned long len);
	223	void write_extent_buffer(struct extent_buffer eb, const void src,
	224	unsigned long start, unsigned long len);
	225	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	226	unsigned long dst_offset, unsigned long src_offset,
	227	unsigned long len);
	228	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	229	unsigned long src_offset, unsigned long len);
	230	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	231	unsigned long src_offset, unsigned long len);
	232	void memset_extent_buffer(struct extent_buffer *eb, char c,
	233	unsigned long start, unsigned long len);
	234	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	235	struct extent_buffer *eb);
e6dcd2dc CM	236	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	237	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	238	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	239	struct extent_buffer *eb);
	240	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	241	struct extent_buffer *eb);
	242	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	243	struct extent_buffer *eb);
1259ab75 CM	244	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	245	struct extent_buffer *eb);
d1310b2e CM	246	int extent_buffer_uptodate(struct extent_io_tree *tree,
	247	struct extent_buffer *eb);
	248	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	249	unsigned long min_len, char token, char map,
	250	unsigned long *map_start,
	251	unsigned long *map_len, int km);
	252	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	253	unsigned long min_len, char token, char map,
	254	unsigned long *map_start,
	255	unsigned long *map_len, int km);
	256	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
ce9adaa5 CM	257	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	258	int extent_range_uptodate(struct extent_io_tree *tree,
	259	u64 start, u64 end);
c8b97818 CM	260	int extent_clear_unlock_delalloc(struct inode *inode,
	261	struct extent_io_tree *tree,
	262	u64 start, u64 end, struct page *locked_page,
771ed689 CM	263	int unlock_page,
	264	int clear_unlock,
	265	int clear_delalloc, int clear_dirty,
	266	int set_writeback,
	267	int end_writeback);
d1310b2e	268	#endif