[mirror_ubuntu-bionic-kernel.git] / fs / btrfs / extent_io.h

#ifndef __EXTENTIO__
#define __EXTENTIO__

#include <linux/rbtree.h>

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

/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */
#define EXTENT_BIO_COMPRESSED 1
#define EXTENT_BIO_FLAG_SHIFT 16

/* these are bit numbers for test/set bit */
#define EXTENT_BUFFER_UPTODATE 0
#define EXTENT_BUFFER_BLOCKING 1
#define EXTENT_BUFFER_DIRTY 2
#define EXTENT_BUFFER_CORRUPT 3

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

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

struct extent_state;

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

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

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

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

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

	struct list_head leak_list;
};

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

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

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

static inline void extent_set_compress_type(unsigned long *bio_flags,
					    int compress_type)
{
	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
}

static inline int extent_compress_type(unsigned long bio_flags)
{
	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
}

struct extent_map_tree;

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

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

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

void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int filled, struct extent_state *cached_state);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		      int bits, gfp_t mask);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     int bits, int wake, int delete, struct extent_state **cached,
		     gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		    int bits, gfp_t mask);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int exclusive_bits, u64 *failed_start,
		   struct extent_state **cached_state, gfp_t mask);
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
			struct extent_state **cached_state, 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 set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
			struct extent_state **cached_state, 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_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		__u64 start, __u64 len, get_extent_t *get_extent);
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);
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
					 u64 start, unsigned long len);
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_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,
				struct extent_state **cached_state);
int extent_buffer_uptodate(struct extent_io_tree *tree,
			   struct extent_buffer *eb,
			   struct extent_state *cached_state);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
int extent_range_uptodate(struct extent_io_tree *tree,
			  u64 start, u64 end);
int extent_clear_unlock_delalloc(struct inode *inode,
				struct extent_io_tree *tree,
				u64 start, u64 end, struct page *locked_page,
				unsigned long op);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
		gfp_t gfp_flags);
#endif
Commit	Line	Data
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)
32c00aff	18	#define EXTENT_DO_ACCOUNTING (1 << 11)
0ca1f7ce	19	#define EXTENT_FIRST_DELALLOC (1 << 12)
d1310b2e	20	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
0ca1f7ce	21	#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING \| EXTENT_FIRST_DELALLOC)
d1310b2e	22
261507a0 LZ	23	/*
	24	* flags for bio submission. The high bits indicate the compression
	25	* type for this bio
	26	*/
c8b97818	27	#define EXTENT_BIO_COMPRESSED 1
261507a0	28	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	29
b4ce94de CM	30	/* these are bit numbers for test/set bit */
	31	#define EXTENT_BUFFER_UPTODATE 0
	32	#define EXTENT_BUFFER_BLOCKING 1
b9473439	33	#define EXTENT_BUFFER_DIRTY 2
a826d6dc	34	#define EXTENT_BUFFER_CORRUPT 3
b4ce94de	35
a791e35e CM	36	/* these are flags for extent_clear_unlock_delalloc */
	37	#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
	38	#define EXTENT_CLEAR_UNLOCK 0x2
	39	#define EXTENT_CLEAR_DELALLOC 0x4
	40	#define EXTENT_CLEAR_DIRTY 0x8
	41	#define EXTENT_SET_WRITEBACK 0x10
	42	#define EXTENT_END_WRITEBACK 0x20
	43	#define EXTENT_SET_PRIVATE2 0x40
32c00aff	44	#define EXTENT_CLEAR_ACCOUNTING 0x80
a791e35e	45
d1310b2e CM	46	/*
	47	* page->private values. Every page that is controlled by the extent
	48	* map has page->private set to one.
	49	*/
	50	#define EXTENT_PAGE_PRIVATE 1
	51	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	52
70dec807 CM	53	struct extent_state;
70dec807 CM	54
44b8bd7e	55	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818	56	struct bio *bio, int mirror_num,
eaf25d93	57	unsigned long bio_flags, u64 bio_offset);
d1310b2e	58	struct extent_io_ops {
c8b97818	59	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	60	u64 start, u64 end, int *page_started,
771ed689 CM	61	unsigned long *nr_written);
247e743c	62	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	63	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	64	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3	65	int (merge_bio_hook)(struct page page, unsigned long offset,
c8b97818 CM	66	size_t size, struct bio *bio,
c8b97818 CM	67	unsigned long bio_flags);
d1310b2e	68	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	69	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	70	u64 start, u64 end,
	71	struct extent_state *state);
1259ab75 CM	72	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	73	u64 start, u64 end,
	74	struct extent_state *state);
70dec807 CM	75	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	76	struct extent_state *state);
1259ab75	77	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	78	struct extent_state *state, int uptodate);
0ca1f7ce YZ	79	int (set_bit_hook)(struct inode inode, struct extent_state *state,
0ca1f7ce YZ	80	int *bits);
9ed74f2d	81	int (clear_bit_hook)(struct inode inode, struct extent_state *state,
0ca1f7ce	82	int *bits);
9ed74f2d JB	83	int (merge_extent_hook)(struct inode inode,
	84	struct extent_state *new,
	85	struct extent_state *other);
	86	int (split_extent_hook)(struct inode inode,
	87	struct extent_state *orig, u64 split);
4bef0848	88	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	89	};
	90
	91	struct extent_io_tree {
	92	struct rb_root state;
19fe0a8b	93	struct radix_tree_root buffer;
d1310b2e CM	94	struct address_space *mapping;
d1310b2e CM	95	u64 dirty_bytes;
70dec807	96	spinlock_t lock;
6af118ce	97	spinlock_t buffer_lock;
d1310b2e	98	struct extent_io_ops *ops;
d1310b2e CM	99	};
	100
	101	struct extent_state {
	102	u64 start;
	103	u64 end; /* inclusive */
d1310b2e	104	struct rb_node rb_node;
9ed74f2d JB	105
9ed74f2d JB	106	/* ADD NEW ELEMENTS AFTER THIS */
70dec807	107	struct extent_io_tree *tree;
d1310b2e CM	108	wait_queue_head_t wq;
	109	atomic_t refs;
	110	unsigned long state;
9ed74f2d JB	111	u64 split_start;
9ed74f2d JB	112	u64 split_end;
d1310b2e CM	113
	114	/* for use by the FS */
	115	u64 private;
	116
2d2ae547	117	struct list_head leak_list;
d1310b2e CM	118	};
	119
	120	struct extent_buffer {
	121	u64 start;
	122	unsigned long len;
	123	char *map_token;
	124	char *kaddr;
	125	unsigned long map_start;
	126	unsigned long map_len;
	127	struct page *first_page;
b4ce94de	128	unsigned long bflags;
d1310b2e	129	atomic_t refs;
2d2ae547	130	struct list_head leak_list;
19fe0a8b	131	struct rcu_head rcu_head;
b4ce94de CM	132
	133	/* the spinlock is used to protect most operations */
	134	spinlock_t lock;
	135
	136	/*
	137	* when we keep the lock held while blocking, waiters go onto
	138	* the wq
	139	*/
	140	wait_queue_head_t lock_wq;
d1310b2e CM	141	};
d1310b2e CM	142
261507a0 LZ	143	static inline void extent_set_compress_type(unsigned long *bio_flags,
	144	int compress_type)
	145	{
	146	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	147	}
	148
	149	static inline int extent_compress_type(unsigned long bio_flags)
	150	{
	151	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	152	}
	153
d1310b2e CM	154	struct extent_map_tree;
	155
	156	typedef struct extent_map (get_extent_t)(struct inode inode,
	157	struct page *page,
306e16ce	158	size_t pg_offset,
d1310b2e CM	159	u64 start, u64 len,
	160	int create);
	161
	162	void extent_io_tree_init(struct extent_io_tree *tree,
f993c883	163	struct address_space *mapping);
d1310b2e	164	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	165	struct extent_io_tree tree, struct page page,
70dec807 CM	166	gfp_t mask);
6af118ce	167	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	168	int try_release_extent_state(struct extent_map_tree *map,
	169	struct extent_io_tree tree, struct page page,
	170	gfp_t mask);
d1310b2e	171	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
1edbb734	172	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d	173	int bits, struct extent_state **cached, gfp_t mask);
d1310b2e	174	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
2ac55d41 JB	175	int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41 JB	176	struct extent_state **cached, gfp_t mask);
25179201 JB	177	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
25179201 JB	178	gfp_t mask);
d1310b2e CM	179	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	180	get_extent_t *get_extent);
	181	int __init extent_io_init(void);
	182	void extent_io_exit(void);
	183
	184	u64 count_range_bits(struct extent_io_tree *tree,
	185	u64 *start, u64 search_end,
ec29ed5b	186	u64 max_bytes, unsigned long bits, int contig);
d1310b2e	187
4845e44f	188	void free_extent_state(struct extent_state *state);
d1310b2e	189	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
9655d298	190	int bits, int filled, struct extent_state *cached_state);
d1310b2e CM	191	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	192	int bits, gfp_t mask);
e6dcd2dc	193	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d CM	194	int bits, int wake, int delete, struct extent_state **cached,
2c64c53d CM	195	gfp_t mask);
d1310b2e CM	196	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	197	int bits, gfp_t mask);
4845e44f CM	198	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
	199	int bits, int exclusive_bits, u64 *failed_start,
	200	struct extent_state **cached_state, gfp_t mask);
d1310b2e	201	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
507903b8	202	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	203	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	204	gfp_t mask);
	205	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	206	gfp_t mask);
	207	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	208	gfp_t mask);
	209	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41	210	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	211	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	212	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	213	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	214	u64 start, int bits);
d1310b2e CM	215	int extent_invalidatepage(struct extent_io_tree *tree,
	216	struct page *page, unsigned long offset);
	217	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	218	get_extent_t *get_extent,
	219	struct writeback_control *wbc);
771ed689 CM	220	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	221	u64 start, u64 end, get_extent_t *get_extent,
	222	int mode);
d1310b2e CM	223	int extent_writepages(struct extent_io_tree *tree,
	224	struct address_space *mapping,
	225	get_extent_t *get_extent,
	226	struct writeback_control *wbc);
	227	int extent_readpages(struct extent_io_tree *tree,
	228	struct address_space *mapping,
	229	struct list_head *pages, unsigned nr_pages,
	230	get_extent_t get_extent);
1506fcc8 YS	231	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	232	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	233	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	234	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	235	void set_page_extent_mapped(struct page *page);
	236
	237	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	238	u64 start, unsigned long len,
ba144192	239	struct page *page0);
d1310b2e	240	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
f09d1f60	241	u64 start, unsigned long len);
d1310b2e CM	242	void free_extent_buffer(struct extent_buffer *eb);
d1310b2e CM	243	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	244	struct extent_buffer *eb, u64 start, int wait,
f188591e	245	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	246
	247	static inline void extent_buffer_get(struct extent_buffer *eb)
	248	{
	249	atomic_inc(&eb->refs);
	250	}
	251
	252	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	253	unsigned long start,
	254	unsigned long len);
	255	void read_extent_buffer(struct extent_buffer eb, void dst,
	256	unsigned long start,
	257	unsigned long len);
	258	void write_extent_buffer(struct extent_buffer eb, const void src,
	259	unsigned long start, unsigned long len);
	260	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	261	unsigned long dst_offset, unsigned long src_offset,
	262	unsigned long len);
	263	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	264	unsigned long src_offset, unsigned long len);
	265	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	266	unsigned long src_offset, unsigned long len);
	267	void memset_extent_buffer(struct extent_buffer *eb, char c,
	268	unsigned long start, unsigned long len);
e6dcd2dc	269	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	270	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	271	struct extent_buffer *eb);
	272	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	273	struct extent_buffer *eb);
	274	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	275	struct extent_buffer *eb);
1259ab75	276	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
2ac55d41 JB	277	struct extent_buffer *eb,
2ac55d41 JB	278	struct extent_state **cached_state);
d1310b2e	279	int extent_buffer_uptodate(struct extent_io_tree *tree,
2ac55d41 JB	280	struct extent_buffer *eb,
2ac55d41 JB	281	struct extent_state *cached_state);
d1310b2e CM	282	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	283	unsigned long min_len, char token, char map,
	284	unsigned long *map_start,
	285	unsigned long *map_len, int km);
	286	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	287	unsigned long min_len, char token, char map,
	288	unsigned long *map_start,
	289	unsigned long *map_len, int km);
	290	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
ce9adaa5 CM	291	int extent_range_uptodate(struct extent_io_tree *tree,
ce9adaa5 CM	292	u64 start, u64 end);
c8b97818 CM	293	int extent_clear_unlock_delalloc(struct inode *inode,
	294	struct extent_io_tree *tree,
	295	u64 start, u64 end, struct page *locked_page,
a791e35e	296	unsigned long op);
88f794ed MX	297	struct bio *
	298	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	299	gfp_t gfp_flags);
d1310b2e	300	#endif