[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_BOUNDARY (1 << 9)
#define EXTENT_NODATASUM (1 << 10)
#define EXTENT_DO_ACCOUNTING (1 << 11)
#define EXTENT_FIRST_DELALLOC (1 << 12)
#define EXTENT_DAMAGED (1 << 13)
#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);
	void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
			     int *bits);
	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
			       int *bits);
	void (*merge_extent_hook)(struct inode *inode,
				  struct extent_state *new,
				  struct extent_state *other);
	void (*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;

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

	struct list_head leak_list;
};

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

	/* count of read lock holders on the extent buffer */
	atomic_t write_locks;
	atomic_t read_locks;
	atomic_t blocking_writers;
	atomic_t blocking_readers;
	atomic_t spinning_readers;
	atomic_t spinning_writers;

	/* protects write locks */
	rwlock_t lock;

	/* readers use lock_wq while they wait for the write
	 * lock holders to unlock
	 */
	wait_queue_head_t write_lock_wq;

	/* writers use read_lock_wq while they wait for readers
	 * to unlock
	 */
	wait_queue_head_t read_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 mirror_num);
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_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len);
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)
0ef8e451	20	#define EXTENT_DAMAGED (1 << 13)
d1310b2e	21	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
0ca1f7ce	22	#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING \| EXTENT_FIRST_DELALLOC)
d1310b2e	23
261507a0 LZ	24	/*
	25	* flags for bio submission. The high bits indicate the compression
	26	* type for this bio
	27	*/
c8b97818	28	#define EXTENT_BIO_COMPRESSED 1
261507a0	29	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	30
b4ce94de CM	31	/* these are bit numbers for test/set bit */
	32	#define EXTENT_BUFFER_UPTODATE 0
	33	#define EXTENT_BUFFER_BLOCKING 1
b9473439	34	#define EXTENT_BUFFER_DIRTY 2
a826d6dc	35	#define EXTENT_BUFFER_CORRUPT 3
b4ce94de	36
a791e35e CM	37	/* these are flags for extent_clear_unlock_delalloc */
	38	#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
	39	#define EXTENT_CLEAR_UNLOCK 0x2
	40	#define EXTENT_CLEAR_DELALLOC 0x4
	41	#define EXTENT_CLEAR_DIRTY 0x8
	42	#define EXTENT_SET_WRITEBACK 0x10
	43	#define EXTENT_END_WRITEBACK 0x20
	44	#define EXTENT_SET_PRIVATE2 0x40
32c00aff	45	#define EXTENT_CLEAR_ACCOUNTING 0x80
a791e35e	46
d1310b2e CM	47	/*
	48	* page->private values. Every page that is controlled by the extent
	49	* map has page->private set to one.
	50	*/
	51	#define EXTENT_PAGE_PRIVATE 1
	52	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	53
70dec807 CM	54	struct extent_state;
70dec807 CM	55
44b8bd7e	56	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818	57	struct bio *bio, int mirror_num,
eaf25d93	58	unsigned long bio_flags, u64 bio_offset);
d1310b2e	59	struct extent_io_ops {
c8b97818	60	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	61	u64 start, u64 end, int *page_started,
771ed689 CM	62	unsigned long *nr_written);
247e743c	63	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	64	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	65	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3	66	int (merge_bio_hook)(struct page page, unsigned long offset,
c8b97818 CM	67	size_t size, struct bio *bio,
c8b97818 CM	68	unsigned long bio_flags);
d1310b2e	69	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	70	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	71	u64 start, u64 end,
	72	struct extent_state *state);
1259ab75 CM	73	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	74	u64 start, u64 end,
	75	struct extent_state *state);
70dec807 CM	76	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	77	struct extent_state *state);
1259ab75	78	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	79	struct extent_state *state, int uptodate);
1bf85046 JM	80	void (set_bit_hook)(struct inode inode, struct extent_state *state,
	81	int *bits);
	82	void (clear_bit_hook)(struct inode inode, struct extent_state *state,
	83	int *bits);
	84	void (merge_extent_hook)(struct inode inode,
	85	struct extent_state *new,
	86	struct extent_state *other);
	87	void (split_extent_hook)(struct inode inode,
	88	struct extent_state *orig, u64 split);
4bef0848	89	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	90	};
	91
	92	struct extent_io_tree {
	93	struct rb_root state;
19fe0a8b	94	struct radix_tree_root buffer;
d1310b2e CM	95	struct address_space *mapping;
d1310b2e CM	96	u64 dirty_bytes;
70dec807	97	spinlock_t lock;
6af118ce	98	spinlock_t buffer_lock;
d1310b2e	99	struct extent_io_ops *ops;
d1310b2e CM	100	};
	101
	102	struct extent_state {
	103	u64 start;
	104	u64 end; /* inclusive */
d1310b2e	105	struct rb_node rb_node;
9ed74f2d JB	106
9ed74f2d JB	107	/* ADD NEW ELEMENTS AFTER THIS */
70dec807	108	struct extent_io_tree *tree;
d1310b2e CM	109	wait_queue_head_t wq;
	110	atomic_t refs;
	111	unsigned long state;
	112
	113	/* for use by the FS */
	114	u64 private;
	115
2d2ae547	116	struct list_head leak_list;
d1310b2e CM	117	};
	118
	119	struct extent_buffer {
	120	u64 start;
	121	unsigned long len;
d1310b2e CM	122	unsigned long map_start;
	123	unsigned long map_len;
	124	struct page *first_page;
b4ce94de	125	unsigned long bflags;
2d2ae547	126	struct list_head leak_list;
19fe0a8b	127	struct rcu_head rcu_head;
9eb9104c	128	atomic_t refs;
b4ce94de	129
bd681513 CM	130	/* count of read lock holders on the extent buffer */
	131	atomic_t write_locks;
	132	atomic_t read_locks;
	133	atomic_t blocking_writers;
	134	atomic_t blocking_readers;
	135	atomic_t spinning_readers;
	136	atomic_t spinning_writers;
	137
	138	/* protects write locks */
	139	rwlock_t lock;
	140
	141	/* readers use lock_wq while they wait for the write
	142	* lock holders to unlock
	143	*/
	144	wait_queue_head_t write_lock_wq;
b4ce94de	145
bd681513 CM	146	/* writers use read_lock_wq while they wait for readers
bd681513 CM	147	* to unlock
b4ce94de	148	*/
bd681513	149	wait_queue_head_t read_lock_wq;
d1310b2e CM	150	};
d1310b2e CM	151
261507a0 LZ	152	static inline void extent_set_compress_type(unsigned long *bio_flags,
	153	int compress_type)
	154	{
	155	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	156	}
	157
	158	static inline int extent_compress_type(unsigned long bio_flags)
	159	{
	160	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	161	}
	162
d1310b2e CM	163	struct extent_map_tree;
	164
	165	typedef struct extent_map (get_extent_t)(struct inode inode,
	166	struct page *page,
306e16ce	167	size_t pg_offset,
d1310b2e CM	168	u64 start, u64 len,
	169	int create);
	170
	171	void extent_io_tree_init(struct extent_io_tree *tree,
f993c883	172	struct address_space *mapping);
d1310b2e	173	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	174	struct extent_io_tree tree, struct page page,
70dec807 CM	175	gfp_t mask);
6af118ce	176	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	177	int try_release_extent_state(struct extent_map_tree *map,
	178	struct extent_io_tree tree, struct page page,
	179	gfp_t mask);
d1310b2e	180	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
1edbb734	181	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d	182	int bits, struct extent_state **cached, gfp_t mask);
d1310b2e	183	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
2ac55d41 JB	184	int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41 JB	185	struct extent_state **cached, gfp_t mask);
25179201 JB	186	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
25179201 JB	187	gfp_t mask);
d1310b2e	188	int extent_read_full_page(struct extent_io_tree tree, struct page page,
8ddc7d9c	189	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	190	int __init extent_io_init(void);
	191	void extent_io_exit(void);
	192
	193	u64 count_range_bits(struct extent_io_tree *tree,
	194	u64 *start, u64 search_end,
ec29ed5b	195	u64 max_bytes, unsigned long bits, int contig);
d1310b2e	196
4845e44f	197	void free_extent_state(struct extent_state *state);
d1310b2e	198	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
9655d298	199	int bits, int filled, struct extent_state *cached_state);
d1310b2e CM	200	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	201	int bits, gfp_t mask);
e6dcd2dc	202	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
2c64c53d CM	203	int bits, int wake, int delete, struct extent_state **cached,
2c64c53d CM	204	gfp_t mask);
d1310b2e CM	205	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	206	int bits, gfp_t mask);
4845e44f CM	207	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
	208	int bits, int exclusive_bits, u64 *failed_start,
	209	struct extent_state **cached_state, gfp_t mask);
d1310b2e	210	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
507903b8	211	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	212	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	213	gfp_t mask);
	214	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	215	gfp_t mask);
	216	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	217	gfp_t mask);
	218	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41	219	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	220	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	221	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	222	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	223	u64 start, int bits);
d1310b2e CM	224	int extent_invalidatepage(struct extent_io_tree *tree,
	225	struct page *page, unsigned long offset);
	226	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	227	get_extent_t *get_extent,
	228	struct writeback_control *wbc);
771ed689 CM	229	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	230	u64 start, u64 end, get_extent_t *get_extent,
	231	int mode);
d1310b2e CM	232	int extent_writepages(struct extent_io_tree *tree,
	233	struct address_space *mapping,
	234	get_extent_t *get_extent,
	235	struct writeback_control *wbc);
	236	int extent_readpages(struct extent_io_tree *tree,
	237	struct address_space *mapping,
	238	struct list_head *pages, unsigned nr_pages,
	239	get_extent_t get_extent);
1506fcc8 YS	240	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	241	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	242	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	243	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	244	void set_page_extent_mapped(struct page *page);
	245
	246	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	247	u64 start, unsigned long len,
ba144192	248	struct page *page0);
d1310b2e	249	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
f09d1f60	250	u64 start, unsigned long len);
d1310b2e CM	251	void free_extent_buffer(struct extent_buffer *eb);
d1310b2e CM	252	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	253	struct extent_buffer *eb, u64 start, int wait,
f188591e	254	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	255
	256	static inline void extent_buffer_get(struct extent_buffer *eb)
	257	{
	258	atomic_inc(&eb->refs);
	259	}
	260
	261	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	262	unsigned long start,
	263	unsigned long len);
	264	void read_extent_buffer(struct extent_buffer eb, void dst,
	265	unsigned long start,
	266	unsigned long len);
	267	void write_extent_buffer(struct extent_buffer eb, const void src,
	268	unsigned long start, unsigned long len);
	269	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	270	unsigned long dst_offset, unsigned long src_offset,
	271	unsigned long len);
	272	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	273	unsigned long src_offset, unsigned long len);
	274	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	275	unsigned long src_offset, unsigned long len);
	276	void memset_extent_buffer(struct extent_buffer *eb, char c,
	277	unsigned long start, unsigned long len);
e6dcd2dc	278	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	279	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	280	struct extent_buffer *eb);
	281	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	282	struct extent_buffer *eb);
	283	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	284	struct extent_buffer *eb);
1259ab75	285	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
2ac55d41 JB	286	struct extent_buffer *eb,
2ac55d41 JB	287	struct extent_state **cached_state);
d1310b2e	288	int extent_buffer_uptodate(struct extent_io_tree *tree,
2ac55d41 JB	289	struct extent_buffer *eb,
2ac55d41 JB	290	struct extent_state *cached_state);
d1310b2e	291	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
a6591715	292	unsigned long min_len, char **map,
d1310b2e	293	unsigned long *map_start,
a6591715	294	unsigned long *map_len);
ce9adaa5 CM	295	int extent_range_uptodate(struct extent_io_tree *tree,
ce9adaa5 CM	296	u64 start, u64 end);
c8b97818 CM	297	int extent_clear_unlock_delalloc(struct inode *inode,
	298	struct extent_io_tree *tree,
	299	u64 start, u64 end, struct page *locked_page,
a791e35e	300	unsigned long op);
88f794ed MX	301	struct bio *
	302	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	303	gfp_t gfp_flags);
d1310b2e	304	#endif