[net-next-2.6.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_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, struct extent_state *state,
			      unsigned long 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 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;

	/* 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 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, 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_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,
				int set_private2);
#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)
8b62b72b CM	16	#define EXTENT_BOUNDARY (1 << 9)
8b62b72b CM	17	#define EXTENT_NODATASUM (1 << 10)
d1310b2e CM	18	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
d1310b2e CM	19
c8b97818 CM	20	/* flags for bio submission */
	21	#define EXTENT_BIO_COMPRESSED 1
	22
b4ce94de CM	23	/* these are bit numbers for test/set bit */
	24	#define EXTENT_BUFFER_UPTODATE 0
	25	#define EXTENT_BUFFER_BLOCKING 1
b9473439	26	#define EXTENT_BUFFER_DIRTY 2
b4ce94de	27
d1310b2e CM	28	/*
	29	* page->private values. Every page that is controlled by the extent
	30	* map has page->private set to one.
	31	*/
	32	#define EXTENT_PAGE_PRIVATE 1
	33	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	34
70dec807 CM	35	struct extent_state;
70dec807 CM	36
44b8bd7e	37	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818 CM	38	struct bio *bio, int mirror_num,
c8b97818 CM	39	unsigned long bio_flags);
d1310b2e	40	struct extent_io_ops {
c8b97818	41	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	42	u64 start, u64 end, int *page_started,
771ed689 CM	43	unsigned long *nr_written);
247e743c	44	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	45	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	46	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3	47	int (merge_bio_hook)(struct page page, unsigned long offset,
c8b97818 CM	48	size_t size, struct bio *bio,
c8b97818 CM	49	unsigned long bio_flags);
d1310b2e	50	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	51	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	52	u64 start, u64 end,
	53	struct extent_state *state);
1259ab75 CM	54	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	55	u64 start, u64 end,
	56	struct extent_state *state);
70dec807 CM	57	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	58	struct extent_state *state);
1259ab75	59	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	60	struct extent_state *state, int uptodate);
291d673e	61	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	62	unsigned long old, unsigned long bits);
9ed74f2d JB	63	int (clear_bit_hook)(struct inode inode, struct extent_state *state,
	64	unsigned long bits);
	65	int (merge_extent_hook)(struct inode inode,
	66	struct extent_state *new,
	67	struct extent_state *other);
	68	int (split_extent_hook)(struct inode inode,
	69	struct extent_state *orig, u64 split);
4bef0848	70	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	71	};
	72
	73	struct extent_io_tree {
	74	struct rb_root state;
6af118ce	75	struct rb_root buffer;
d1310b2e CM	76	struct address_space *mapping;
d1310b2e CM	77	u64 dirty_bytes;
70dec807	78	spinlock_t lock;
6af118ce	79	spinlock_t buffer_lock;
d1310b2e	80	struct extent_io_ops *ops;
d1310b2e CM	81	};
	82
	83	struct extent_state {
	84	u64 start;
	85	u64 end; /* inclusive */
d1310b2e	86	struct rb_node rb_node;
9ed74f2d JB	87
9ed74f2d JB	88	/* ADD NEW ELEMENTS AFTER THIS */
70dec807	89	struct extent_io_tree *tree;
d1310b2e CM	90	wait_queue_head_t wq;
	91	atomic_t refs;
	92	unsigned long state;
9ed74f2d JB	93	u64 split_start;
9ed74f2d JB	94	u64 split_end;
d1310b2e CM	95
	96	/* for use by the FS */
	97	u64 private;
	98
2d2ae547	99	struct list_head leak_list;
d1310b2e CM	100	};
	101
	102	struct extent_buffer {
	103	u64 start;
	104	unsigned long len;
	105	char *map_token;
	106	char *kaddr;
	107	unsigned long map_start;
	108	unsigned long map_len;
	109	struct page *first_page;
b4ce94de	110	unsigned long bflags;
d1310b2e	111	atomic_t refs;
2d2ae547	112	struct list_head leak_list;
6af118ce	113	struct rb_node rb_node;
b4ce94de CM	114
	115	/* the spinlock is used to protect most operations */
	116	spinlock_t lock;
	117
	118	/*
	119	* when we keep the lock held while blocking, waiters go onto
	120	* the wq
	121	*/
	122	wait_queue_head_t lock_wq;
d1310b2e CM	123	};
	124
	125	struct extent_map_tree;
	126
d7fc640e CM	127	static inline struct extent_state extent_state_next(struct extent_state state)
	128	{
	129	struct rb_node *node;
	130	node = rb_next(&state->rb_node);
	131	if (!node)
	132	return NULL;
	133	return rb_entry(node, struct extent_state, rb_node);
	134	}
	135
d1310b2e CM	136	typedef struct extent_map (get_extent_t)(struct inode inode,
	137	struct page *page,
	138	size_t page_offset,
	139	u64 start, u64 len,
	140	int create);
	141
	142	void extent_io_tree_init(struct extent_io_tree *tree,
	143	struct address_space *mapping, gfp_t mask);
d1310b2e	144	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	145	struct extent_io_tree tree, struct page page,
70dec807 CM	146	gfp_t mask);
6af118ce	147	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	148	int try_release_extent_state(struct extent_map_tree *map,
	149	struct extent_io_tree tree, struct page page,
	150	gfp_t mask);
d1310b2e	151	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
1edbb734	152	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d	153	int bits, struct extent_state **cached, gfp_t mask);
d1310b2e	154	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
25179201 JB	155	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
25179201 JB	156	gfp_t mask);
d1310b2e CM	157	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	158	get_extent_t *get_extent);
	159	int __init extent_io_init(void);
	160	void extent_io_exit(void);
	161
	162	u64 count_range_bits(struct extent_io_tree *tree,
	163	u64 *start, u64 search_end,
	164	u64 max_bytes, unsigned long bits);
	165
	166	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
9655d298	167	int bits, int filled, struct extent_state *cached_state);
d1310b2e CM	168	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	169	int bits, gfp_t mask);
e6dcd2dc	170	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d CM	171	int bits, int wake, int delete, struct extent_state **cached,
2c64c53d CM	172	gfp_t mask);
d1310b2e CM	173	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	174	int bits, gfp_t mask);
	175	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	176	gfp_t mask);
	177	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	178	gfp_t mask);
	179	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	180	gfp_t mask);
	181	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	182	gfp_t mask);
e6dcd2dc CM	183	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	184	gfp_t mask);
	185	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	186	u64 end, gfp_t mask);
d1310b2e CM	187	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	188	gfp_t mask);
e6dcd2dc CM	189	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	190	gfp_t mask);
d1310b2e CM	191	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	192	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	193	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	194	u64 start, int bits);
d1310b2e CM	195	int extent_invalidatepage(struct extent_io_tree *tree,
	196	struct page *page, unsigned long offset);
	197	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	198	get_extent_t *get_extent,
	199	struct writeback_control *wbc);
771ed689 CM	200	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	201	u64 start, u64 end, get_extent_t *get_extent,
	202	int mode);
d1310b2e CM	203	int extent_writepages(struct extent_io_tree *tree,
	204	struct address_space *mapping,
	205	get_extent_t *get_extent,
	206	struct writeback_control *wbc);
	207	int extent_readpages(struct extent_io_tree *tree,
	208	struct address_space *mapping,
	209	struct list_head *pages, unsigned nr_pages,
	210	get_extent_t get_extent);
	211	int extent_prepare_write(struct extent_io_tree *tree,
	212	struct inode inode, struct page page,
	213	unsigned from, unsigned to, get_extent_t *get_extent);
	214	int extent_commit_write(struct extent_io_tree *tree,
	215	struct inode inode, struct page page,
	216	unsigned from, unsigned to);
	217	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	218	get_extent_t *get_extent);
1506fcc8 YS	219	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	220	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	221	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	222	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	223	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	224	void set_page_extent_mapped(struct page *page);
	225
	226	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	227	u64 start, unsigned long len,
	228	struct page *page0,
	229	gfp_t mask);
	230	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	231	u64 start, unsigned long len,
	232	gfp_t mask);
	233	void free_extent_buffer(struct extent_buffer *eb);
	234	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	235	struct extent_buffer *eb, u64 start, int wait,
f188591e	236	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	237
	238	static inline void extent_buffer_get(struct extent_buffer *eb)
	239	{
	240	atomic_inc(&eb->refs);
	241	}
	242
	243	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	244	unsigned long start,
	245	unsigned long len);
	246	void read_extent_buffer(struct extent_buffer eb, void dst,
	247	unsigned long start,
	248	unsigned long len);
	249	void write_extent_buffer(struct extent_buffer eb, const void src,
	250	unsigned long start, unsigned long len);
	251	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	252	unsigned long dst_offset, unsigned long src_offset,
	253	unsigned long len);
	254	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	255	unsigned long src_offset, unsigned long len);
	256	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	257	unsigned long src_offset, unsigned long len);
	258	void memset_extent_buffer(struct extent_buffer *eb, char c,
	259	unsigned long start, unsigned long len);
	260	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	261	struct extent_buffer *eb);
e6dcd2dc CM	262	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	263	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	264	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	265	struct extent_buffer *eb);
	266	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	267	struct extent_buffer *eb);
b9473439 CM	268	int test_extent_buffer_dirty(struct extent_io_tree *tree,
b9473439 CM	269	struct extent_buffer *eb);
d1310b2e CM	270	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
d1310b2e CM	271	struct extent_buffer *eb);
1259ab75 CM	272	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	273	struct extent_buffer *eb);
d1310b2e CM	274	int extent_buffer_uptodate(struct extent_io_tree *tree,
	275	struct extent_buffer *eb);
	276	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	277	unsigned long min_len, char token, char map,
	278	unsigned long *map_start,
	279	unsigned long *map_len, int km);
	280	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	281	unsigned long min_len, char token, char map,
	282	unsigned long *map_start,
	283	unsigned long *map_len, int km);
	284	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
ce9adaa5 CM	285	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	286	int extent_range_uptodate(struct extent_io_tree *tree,
	287	u64 start, u64 end);
c8b97818 CM	288	int extent_clear_unlock_delalloc(struct inode *inode,
	289	struct extent_io_tree *tree,
	290	u64 start, u64 end, struct page *locked_page,
771ed689 CM	291	int unlock_page,
	292	int clear_unlock,
	293	int clear_delalloc, int clear_dirty,
	294	int set_writeback,
8b62b72b CM	295	int end_writeback,
8b62b72b CM	296	int set_private2);
d1310b2e	297	#endif