[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_ORDERED (1 << 9)
#define EXTENT_ORDERED_METADATA (1 << 10)
#define EXTENT_BOUNDARY (1 << 11)
#define EXTENT_NODATASUM (1 << 12)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)

/* 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

/*
 * 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;
	unsigned long bflags;
	atomic_t refs;
	struct list_head leak_list;
	struct rb_node rb_node;

	/* 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 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, 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_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 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);
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)
17d217fe	19	#define EXTENT_NODATASUM (1 << 12)
d1310b2e CM	20	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
d1310b2e CM	21
c8b97818 CM	22	/* flags for bio submission */
	23	#define EXTENT_BIO_COMPRESSED 1
	24
b4ce94de CM	25	/* these are bit numbers for test/set bit */
	26	#define EXTENT_BUFFER_UPTODATE 0
	27	#define EXTENT_BUFFER_BLOCKING 1
b9473439	28	#define EXTENT_BUFFER_DIRTY 2
b4ce94de	29
d1310b2e CM	30	/*
	31	* page->private values. Every page that is controlled by the extent
	32	* map has page->private set to one.
	33	*/
	34	#define EXTENT_PAGE_PRIVATE 1
	35	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	36
70dec807 CM	37	struct extent_state;
70dec807 CM	38
44b8bd7e	39	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818 CM	40	struct bio *bio, int mirror_num,
c8b97818 CM	41	unsigned long bio_flags);
d1310b2e	42	struct extent_io_ops {
c8b97818	43	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	44	u64 start, u64 end, int *page_started,
771ed689 CM	45	unsigned long *nr_written);
247e743c	46	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	47	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	48	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3	49	int (merge_bio_hook)(struct page page, unsigned long offset,
c8b97818 CM	50	size_t size, struct bio *bio,
c8b97818 CM	51	unsigned long bio_flags);
d1310b2e	52	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	53	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	54	u64 start, u64 end,
	55	struct extent_state *state);
1259ab75 CM	56	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	57	u64 start, u64 end,
	58	struct extent_state *state);
70dec807 CM	59	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	60	struct extent_state *state);
1259ab75	61	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	62	struct extent_state *state, int uptodate);
291d673e	63	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	64	unsigned long old, unsigned long bits);
291d673e	65	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	66	unsigned long old, unsigned long bits);
4bef0848	67	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	68	};
	69
	70	struct extent_io_tree {
	71	struct rb_root state;
6af118ce	72	struct rb_root buffer;
d1310b2e CM	73	struct address_space *mapping;
d1310b2e CM	74	u64 dirty_bytes;
70dec807	75	spinlock_t lock;
6af118ce	76	spinlock_t buffer_lock;
d1310b2e	77	struct extent_io_ops *ops;
d1310b2e CM	78	};
	79
	80	struct extent_state {
	81	u64 start;
	82	u64 end; /* inclusive */
d1310b2e	83	struct rb_node rb_node;
70dec807	84	struct extent_io_tree *tree;
d1310b2e CM	85	wait_queue_head_t wq;
	86	atomic_t refs;
	87	unsigned long state;
	88
	89	/* for use by the FS */
	90	u64 private;
	91
2d2ae547	92	struct list_head leak_list;
d1310b2e CM	93	};
	94
	95	struct extent_buffer {
	96	u64 start;
	97	unsigned long len;
	98	char *map_token;
	99	char *kaddr;
	100	unsigned long map_start;
	101	unsigned long map_len;
	102	struct page *first_page;
b4ce94de	103	unsigned long bflags;
d1310b2e	104	atomic_t refs;
2d2ae547	105	struct list_head leak_list;
6af118ce	106	struct rb_node rb_node;
b4ce94de CM	107
	108	/* the spinlock is used to protect most operations */
	109	spinlock_t lock;
	110
	111	/*
	112	* when we keep the lock held while blocking, waiters go onto
	113	* the wq
	114	*/
	115	wait_queue_head_t lock_wq;
d1310b2e CM	116	};
	117
	118	struct extent_map_tree;
	119
d7fc640e CM	120	static inline struct extent_state extent_state_next(struct extent_state state)
	121	{
	122	struct rb_node *node;
	123	node = rb_next(&state->rb_node);
	124	if (!node)
	125	return NULL;
	126	return rb_entry(node, struct extent_state, rb_node);
	127	}
	128
d1310b2e CM	129	typedef struct extent_map (get_extent_t)(struct inode inode,
	130	struct page *page,
	131	size_t page_offset,
	132	u64 start, u64 len,
	133	int create);
	134
	135	void extent_io_tree_init(struct extent_io_tree *tree,
	136	struct address_space *mapping, gfp_t mask);
d1310b2e	137	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	138	struct extent_io_tree tree, struct page page,
70dec807 CM	139	gfp_t mask);
6af118ce	140	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	141	int try_release_extent_state(struct extent_map_tree *map,
	142	struct extent_io_tree tree, struct page page,
	143	gfp_t mask);
d1310b2e	144	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
1edbb734	145	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d	146	int bits, struct extent_state **cached, gfp_t mask);
d1310b2e	147	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
25179201 JB	148	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
25179201 JB	149	gfp_t mask);
d1310b2e CM	150	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	151	get_extent_t *get_extent);
	152	int __init extent_io_init(void);
	153	void extent_io_exit(void);
	154
	155	u64 count_range_bits(struct extent_io_tree *tree,
	156	u64 *start, u64 search_end,
	157	u64 max_bytes, unsigned long bits);
	158
	159	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	160	int bits, int filled);
	161	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	162	int bits, gfp_t mask);
e6dcd2dc	163	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d CM	164	int bits, int wake, int delete, struct extent_state **cached,
2c64c53d CM	165	gfp_t mask);
d1310b2e CM	166	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	167	int bits, gfp_t mask);
	168	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	169	gfp_t mask);
	170	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	171	gfp_t mask);
	172	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	173	gfp_t mask);
	174	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	175	gfp_t mask);
e6dcd2dc CM	176	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	177	gfp_t mask);
	178	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	179	u64 end, gfp_t mask);
d1310b2e CM	180	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	181	gfp_t mask);
e6dcd2dc CM	182	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	183	gfp_t mask);
d1310b2e CM	184	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	185	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	186	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	187	u64 start, int bits);
d1310b2e CM	188	int extent_invalidatepage(struct extent_io_tree *tree,
	189	struct page *page, unsigned long offset);
	190	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	191	get_extent_t *get_extent,
	192	struct writeback_control *wbc);
771ed689 CM	193	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	194	u64 start, u64 end, get_extent_t *get_extent,
	195	int mode);
d1310b2e CM	196	int extent_writepages(struct extent_io_tree *tree,
	197	struct address_space *mapping,
	198	get_extent_t *get_extent,
	199	struct writeback_control *wbc);
	200	int extent_readpages(struct extent_io_tree *tree,
	201	struct address_space *mapping,
	202	struct list_head *pages, unsigned nr_pages,
	203	get_extent_t get_extent);
	204	int extent_prepare_write(struct extent_io_tree *tree,
	205	struct inode inode, struct page page,
	206	unsigned from, unsigned to, get_extent_t *get_extent);
	207	int extent_commit_write(struct extent_io_tree *tree,
	208	struct inode inode, struct page page,
	209	unsigned from, unsigned to);
	210	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	211	get_extent_t *get_extent);
1506fcc8 YS	212	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	213	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	214	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	215	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	216	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	217	void set_page_extent_mapped(struct page *page);
	218
	219	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	220	u64 start, unsigned long len,
	221	struct page *page0,
	222	gfp_t mask);
	223	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	224	u64 start, unsigned long len,
	225	gfp_t mask);
	226	void free_extent_buffer(struct extent_buffer *eb);
	227	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	228	struct extent_buffer *eb, u64 start, int wait,
f188591e	229	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	230
	231	static inline void extent_buffer_get(struct extent_buffer *eb)
	232	{
	233	atomic_inc(&eb->refs);
	234	}
	235
	236	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	237	unsigned long start,
	238	unsigned long len);
	239	void read_extent_buffer(struct extent_buffer eb, void dst,
	240	unsigned long start,
	241	unsigned long len);
	242	void write_extent_buffer(struct extent_buffer eb, const void src,
	243	unsigned long start, unsigned long len);
	244	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	245	unsigned long dst_offset, unsigned long src_offset,
	246	unsigned long len);
	247	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	248	unsigned long src_offset, unsigned long len);
	249	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	250	unsigned long src_offset, unsigned long len);
	251	void memset_extent_buffer(struct extent_buffer *eb, char c,
	252	unsigned long start, unsigned long len);
	253	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	254	struct extent_buffer *eb);
e6dcd2dc CM	255	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	256	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	257	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	258	struct extent_buffer *eb);
	259	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	260	struct extent_buffer *eb);
b9473439 CM	261	int test_extent_buffer_dirty(struct extent_io_tree *tree,
b9473439 CM	262	struct extent_buffer *eb);
d1310b2e CM	263	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
d1310b2e CM	264	struct extent_buffer *eb);
1259ab75 CM	265	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	266	struct extent_buffer *eb);
d1310b2e CM	267	int extent_buffer_uptodate(struct extent_io_tree *tree,
	268	struct extent_buffer *eb);
	269	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	270	unsigned long min_len, char token, char map,
	271	unsigned long *map_start,
	272	unsigned long *map_len, int km);
	273	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	274	unsigned long min_len, char token, char map,
	275	unsigned long *map_start,
	276	unsigned long *map_len, int km);
	277	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
ce9adaa5 CM	278	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	279	int extent_range_uptodate(struct extent_io_tree *tree,
	280	u64 start, u64 end);
c8b97818 CM	281	int extent_clear_unlock_delalloc(struct inode *inode,
	282	struct extent_io_tree *tree,
	283	u64 start, u64 end, struct page *locked_page,
771ed689 CM	284	int unlock_page,
	285	int clear_unlock,
	286	int clear_delalloc, int clear_dirty,
	287	int set_writeback,
	288	int end_writeback);
d1310b2e	289	#endif