[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_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

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