[linux-2.6-block.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_NEED_WAIT (1 << 13)
#define EXTENT_DAMAGED (1 << 14)
#define EXTENT_NORESERVE (1 << 15)
#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_TREE_LOG 2
#define EXTENT_BIO_PARENT_LOCKED 4
#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
#define EXTENT_BUFFER_READAHEAD 4	/* this got triggered by readahead */
#define EXTENT_BUFFER_TREE_REF 5
#define EXTENT_BUFFER_STALE 6
#define EXTENT_BUFFER_WRITEBACK 7
#define EXTENT_BUFFER_IOERR 8
#define EXTENT_BUFFER_DUMMY 9
#define EXTENT_BUFFER_IN_TREE 10

/* these are flags for extent_clear_unlock_delalloc */
#define PAGE_UNLOCK		(1 << 0)
#define PAGE_CLEAR_DIRTY	(1 << 1)
#define PAGE_SET_WRITEBACK	(1 << 2)
#define PAGE_END_WRITEBACK	(1 << 3)
#define PAGE_SET_PRIVATE2	(1 << 4)

/*
 * 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;
struct btrfs_root;
struct btrfs_io_bio;

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)(int rw, struct page *page, unsigned long offset,
			      size_t size, struct bio *bio,
			      unsigned long bio_flags);
	int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
				    struct page *page, u64 start, u64 end,
				    int mirror);
	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,
			     unsigned long *bits);
	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
			       unsigned long *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);
};

struct extent_io_tree {
	struct rb_root state;
	struct address_space *mapping;
	u64 dirty_bytes;
	int track_uptodate;
	spinlock_t 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;

#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

#define INLINE_EXTENT_BUFFER_PAGES 16
#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
struct extent_buffer {
	u64 start;
	unsigned long len;
	unsigned long map_start;
	unsigned long map_len;
	unsigned long bflags;
	struct btrfs_fs_info *fs_info;
	spinlock_t refs_lock;
	atomic_t refs;
	atomic_t io_pages;
	int read_mirror;
	struct rcu_head rcu_head;
	pid_t lock_owner;

	/* 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;
	int lock_nested;

	/* 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;
	wait_queue_head_t lock_wq;
	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

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 page *page);
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		     unsigned long bits, struct extent_state **cached);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
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);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent, int mirror_num);
int extent_read_full_page_nolock(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,
		   unsigned long bits, int filled,
		   struct extent_state *cached_state);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		      unsigned long bits, gfp_t mask);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     unsigned long 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,
		    unsigned long bits, gfp_t mask);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   unsigned long 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 clear_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 convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       unsigned long bits, unsigned long clear_bits,
		       struct extent_state **cached_state, 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 set_extent_defrag(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, unsigned long bits,
			  struct extent_state **cached_state);
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 btree_write_cache_pages(struct address_space *mapping,
			    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 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 btrfs_fs_info *fs_info,
					  u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
					 u64 start);
void free_extent_buffer(struct extent_buffer *eb);
void free_extent_buffer_stale(struct extent_buffer *eb);
#define WAIT_NONE	0
#define WAIT_COMPLETE	1
#define WAIT_PAGE_LOCK	2
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);
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);

static inline unsigned long num_extent_pages(u64 start, u64 len)
{
	return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
		(start >> PAGE_CACHE_SHIFT);
}

static inline struct page *extent_buffer_page(struct extent_buffer *eb,
					      unsigned long i)
{
	return eb->pages[i];
}

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);
void clear_extent_buffer_dirty(struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_buffer *eb);
int clear_extent_buffer_uptodate(struct extent_buffer *eb);
int extent_buffer_uptodate(struct extent_buffer *eb);
int extent_buffer_under_io(struct extent_buffer *eb);
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_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
				 struct page *locked_page,
				 unsigned long bits_to_clear,
				 unsigned long page_ops);
struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
		gfp_t gfp_flags);
struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);

struct btrfs_fs_info;

int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
			u64 length, u64 logical, struct page *page,
			int mirror_num);
int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
			 int mirror_num);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
noinline u64 find_lock_delalloc_range(struct inode *inode,
				      struct extent_io_tree *tree,
				      struct page *locked_page, u64 *start,
				      u64 *end, u64 max_bytes);
#endif
#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)
1728366e	20	#define EXTENT_NEED_WAIT (1 << 13)
806468f8	21	#define EXTENT_DAMAGED (1 << 14)
7ee9e440	22	#define EXTENT_NORESERVE (1 << 15)
d1310b2e	23	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
0ca1f7ce	24	#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING \| EXTENT_FIRST_DELALLOC)
d1310b2e	25
261507a0 LZ	26	/*
	27	* flags for bio submission. The high bits indicate the compression
	28	* type for this bio
	29	*/
c8b97818	30	#define EXTENT_BIO_COMPRESSED 1
de0022b9	31	#define EXTENT_BIO_TREE_LOG 2
4b384318	32	#define EXTENT_BIO_PARENT_LOCKED 4
261507a0	33	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	34
b4ce94de CM	35	/* these are bit numbers for test/set bit */
	36	#define EXTENT_BUFFER_UPTODATE 0
	37	#define EXTENT_BUFFER_BLOCKING 1
b9473439	38	#define EXTENT_BUFFER_DIRTY 2
a826d6dc	39	#define EXTENT_BUFFER_CORRUPT 3
ab0fff03	40	#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
3083ee2e JB	41	#define EXTENT_BUFFER_TREE_REF 5
3083ee2e JB	42	#define EXTENT_BUFFER_STALE 6
0b32f4bb JB	43	#define EXTENT_BUFFER_WRITEBACK 7
0b32f4bb JB	44	#define EXTENT_BUFFER_IOERR 8
815a51c7	45	#define EXTENT_BUFFER_DUMMY 9
34b41ace	46	#define EXTENT_BUFFER_IN_TREE 10
b4ce94de	47
a791e35e	48	/* these are flags for extent_clear_unlock_delalloc */
c2790a2e JB	49	#define PAGE_UNLOCK (1 << 0)
	50	#define PAGE_CLEAR_DIRTY (1 << 1)
	51	#define PAGE_SET_WRITEBACK (1 << 2)
	52	#define PAGE_END_WRITEBACK (1 << 3)
	53	#define PAGE_SET_PRIVATE2 (1 << 4)
a791e35e	54
d1310b2e CM	55	/*
	56	* page->private values. Every page that is controlled by the extent
	57	* map has page->private set to one.
	58	*/
	59	#define EXTENT_PAGE_PRIVATE 1
	60	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	61
70dec807	62	struct extent_state;
ea466794	63	struct btrfs_root;
facc8a22	64	struct btrfs_io_bio;
70dec807	65
44b8bd7e	66	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818	67	struct bio *bio, int mirror_num,
eaf25d93	68	unsigned long bio_flags, u64 bio_offset);
d1310b2e	69	struct extent_io_ops {
c8b97818	70	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	71	u64 start, u64 end, int *page_started,
771ed689 CM	72	unsigned long *nr_written);
247e743c	73	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	74	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	75	extent_submit_bio_hook_t *submit_bio_hook;
64a16701	76	int (merge_bio_hook)(int rw, struct page page, unsigned long offset,
c8b97818 CM	77	size_t size, struct bio *bio,
c8b97818 CM	78	unsigned long bio_flags);
ea466794	79	int (readpage_io_failed_hook)(struct page page, int failed_mirror);
facc8a22 MX	80	int (readpage_end_io_hook)(struct btrfs_io_bio io_bio, u64 phy_offset,
	81	struct page *page, u64 start, u64 end,
	82	int mirror);
1259ab75	83	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	84	struct extent_state *state, int uptodate);
1bf85046	85	void (set_bit_hook)(struct inode inode, struct extent_state *state,
41074888	86	unsigned long *bits);
1bf85046	87	void (clear_bit_hook)(struct inode inode, struct extent_state *state,
41074888	88	unsigned long *bits);
1bf85046 JM	89	void (merge_extent_hook)(struct inode inode,
	90	struct extent_state *new,
	91	struct extent_state *other);
	92	void (split_extent_hook)(struct inode inode,
	93	struct extent_state *orig, u64 split);
d1310b2e CM	94	};
	95
	96	struct extent_io_tree {
	97	struct rb_root state;
	98	struct address_space *mapping;
	99	u64 dirty_bytes;
0b32f4bb	100	int track_uptodate;
70dec807	101	spinlock_t lock;
d1310b2e	102	struct extent_io_ops *ops;
d1310b2e CM	103	};
	104
	105	struct extent_state {
	106	u64 start;
	107	u64 end; /* inclusive */
d1310b2e	108	struct rb_node rb_node;
9ed74f2d JB	109
9ed74f2d JB	110	/* ADD NEW ELEMENTS AFTER THIS */
70dec807	111	struct extent_io_tree *tree;
d1310b2e CM	112	wait_queue_head_t wq;
	113	atomic_t refs;
	114	unsigned long state;
	115
	116	/* for use by the FS */
	117	u64 private;
	118
6d49ba1b	119	#ifdef CONFIG_BTRFS_DEBUG
2d2ae547	120	struct list_head leak_list;
6d49ba1b	121	#endif
d1310b2e CM	122	};
d1310b2e CM	123
727011e0 CM	124	#define INLINE_EXTENT_BUFFER_PAGES 16
727011e0 CM	125	#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
d1310b2e CM	126	struct extent_buffer {
	127	u64 start;
	128	unsigned long len;
d1310b2e CM	129	unsigned long map_start;
d1310b2e CM	130	unsigned long map_len;
b4ce94de	131	unsigned long bflags;
f28491e0	132	struct btrfs_fs_info *fs_info;
3083ee2e	133	spinlock_t refs_lock;
727011e0	134	atomic_t refs;
0b32f4bb	135	atomic_t io_pages;
5cf1ab56	136	int read_mirror;
19fe0a8b	137	struct rcu_head rcu_head;
5b25f70f	138	pid_t lock_owner;
b4ce94de	139
bd681513 CM	140	/* count of read lock holders on the extent buffer */
	141	atomic_t write_locks;
	142	atomic_t read_locks;
	143	atomic_t blocking_writers;
	144	atomic_t blocking_readers;
	145	atomic_t spinning_readers;
	146	atomic_t spinning_writers;
5b25f70f	147	int lock_nested;
bd681513 CM	148
	149	/* protects write locks */
	150	rwlock_t lock;
	151
	152	/* readers use lock_wq while they wait for the write
	153	* lock holders to unlock
	154	*/
	155	wait_queue_head_t write_lock_wq;
b4ce94de	156
bd681513 CM	157	/* writers use read_lock_wq while they wait for readers
bd681513 CM	158	* to unlock
b4ce94de	159	*/
bd681513	160	wait_queue_head_t read_lock_wq;
727011e0	161	wait_queue_head_t lock_wq;
b8dae313	162	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	163	#ifdef CONFIG_BTRFS_DEBUG
	164	struct list_head leak_list;
	165	#endif
d1310b2e CM	166	};
d1310b2e CM	167
261507a0 LZ	168	static inline void extent_set_compress_type(unsigned long *bio_flags,
	169	int compress_type)
	170	{
	171	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	172	}
	173
	174	static inline int extent_compress_type(unsigned long bio_flags)
	175	{
	176	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	177	}
	178
d1310b2e CM	179	struct extent_map_tree;
	180
	181	typedef struct extent_map (get_extent_t)(struct inode inode,
	182	struct page *page,
306e16ce	183	size_t pg_offset,
d1310b2e CM	184	u64 start, u64 len,
	185	int create);
	186
	187	void extent_io_tree_init(struct extent_io_tree *tree,
f993c883	188	struct address_space *mapping);
d1310b2e	189	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	190	struct extent_io_tree tree, struct page page,
70dec807 CM	191	gfp_t mask);
f7a52a40	192	int try_release_extent_buffer(struct page *page);
d0082371	193	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
1edbb734	194	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	195	unsigned long bits, struct extent_state **cached);
d0082371	196	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
2ac55d41 JB	197	int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41 JB	198	struct extent_state **cached, gfp_t mask);
d0082371	199	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
d1310b2e	200	int extent_read_full_page(struct extent_io_tree tree, struct page page,
8ddc7d9c	201	get_extent_t *get_extent, int mirror_num);
4b384318 MF	202	int extent_read_full_page_nolock(struct extent_io_tree tree, struct page page,
4b384318 MF	203	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	204	int __init extent_io_init(void);
	205	void extent_io_exit(void);
	206
	207	u64 count_range_bits(struct extent_io_tree *tree,
	208	u64 *start, u64 search_end,
ec29ed5b	209	u64 max_bytes, unsigned long bits, int contig);
d1310b2e	210
4845e44f	211	void free_extent_state(struct extent_state *state);
d1310b2e	212	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888 DS	213	unsigned long bits, int filled,
41074888 DS	214	struct extent_state *cached_state);
d1310b2e	215	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	216	unsigned long bits, gfp_t mask);
e6dcd2dc	217	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888 DS	218	unsigned long bits, int wake, int delete,
41074888 DS	219	struct extent_state **cached, gfp_t mask);
d1310b2e	220	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	221	unsigned long bits, gfp_t mask);
4845e44f	222	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888	223	unsigned long bits, u64 *failed_start,
4845e44f	224	struct extent_state **cached_state, gfp_t mask);
d1310b2e	225	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
507903b8	226	struct extent_state **cached_state, gfp_t mask);
5fd02043 JB	227	int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
5fd02043 JB	228	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	229	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	230	gfp_t mask);
	231	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	232	gfp_t mask);
	233	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	234	gfp_t mask);
462d6fac	235	int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888	236	unsigned long bits, unsigned long clear_bits,
e6138876	237	struct extent_state **cached_state, gfp_t mask);
d1310b2e	238	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41	239	struct extent_state **cached_state, gfp_t mask);
9e8a4a8b LB	240	int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
9e8a4a8b LB	241	struct extent_state **cached_state, gfp_t mask);
d1310b2e	242	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
41074888	243	u64 start_ret, u64 end_ret, unsigned long bits,
e6138876	244	struct extent_state **cached_state);
d1310b2e CM	245	int extent_invalidatepage(struct extent_io_tree *tree,
	246	struct page *page, unsigned long offset);
	247	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	248	get_extent_t *get_extent,
	249	struct writeback_control *wbc);
771ed689 CM	250	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	251	u64 start, u64 end, get_extent_t *get_extent,
	252	int mode);
d1310b2e CM	253	int extent_writepages(struct extent_io_tree *tree,
	254	struct address_space *mapping,
	255	get_extent_t *get_extent,
	256	struct writeback_control *wbc);
0b32f4bb JB	257	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	258	struct writeback_control *wbc);
d1310b2e CM	259	int extent_readpages(struct extent_io_tree *tree,
	260	struct address_space *mapping,
	261	struct list_head *pages, unsigned nr_pages,
	262	get_extent_t get_extent);
1506fcc8 YS	263	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	264	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	265	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	266	void set_page_extent_mapped(struct page *page);
	267
f28491e0	268	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
727011e0	269	u64 start, unsigned long len);
815a51c7 JS	270	struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
815a51c7 JS	271	struct extent_buffer btrfs_clone_extent_buffer(struct extent_buffer src);
f28491e0	272	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	273	u64 start);
d1310b2e	274	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	275	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	276	#define WAIT_NONE 0
	277	#define WAIT_COMPLETE 1
	278	#define WAIT_PAGE_LOCK 2
d1310b2e	279	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	280	struct extent_buffer *eb, u64 start, int wait,
f188591e	281	get_extent_t *get_extent, int mirror_num);
fd8b2b61	282	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
479ed9ab RD	283
	284	static inline unsigned long num_extent_pages(u64 start, u64 len)
	285	{
	286	return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
	287	(start >> PAGE_CACHE_SHIFT);
	288	}
	289
	290	static inline struct page extent_buffer_page(struct extent_buffer eb,
	291	unsigned long i)
	292	{
	293	return eb->pages[i];
	294	}
d1310b2e CM	295
	296	static inline void extent_buffer_get(struct extent_buffer *eb)
	297	{
	298	atomic_inc(&eb->refs);
	299	}
	300
	301	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	302	unsigned long start,
	303	unsigned long len);
	304	void read_extent_buffer(struct extent_buffer eb, void dst,
	305	unsigned long start,
	306	unsigned long len);
	307	void write_extent_buffer(struct extent_buffer eb, const void src,
	308	unsigned long start, unsigned long len);
	309	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	310	unsigned long dst_offset, unsigned long src_offset,
	311	unsigned long len);
	312	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	313	unsigned long src_offset, unsigned long len);
	314	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	315	unsigned long src_offset, unsigned long len);
	316	void memset_extent_buffer(struct extent_buffer *eb, char c,
	317	unsigned long start, unsigned long len);
1d4284bd	318	void clear_extent_buffer_dirty(struct extent_buffer *eb);
0b32f4bb JB	319	int set_extent_buffer_dirty(struct extent_buffer *eb);
	320	int set_extent_buffer_uptodate(struct extent_buffer *eb);
	321	int clear_extent_buffer_uptodate(struct extent_buffer *eb);
	322	int extent_buffer_uptodate(struct extent_buffer *eb);
a26e8c9f	323	int extent_buffer_under_io(struct extent_buffer *eb);
d1310b2e	324	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
a6591715	325	unsigned long min_len, char **map,
d1310b2e	326	unsigned long *map_start,
a6591715	327	unsigned long *map_len);
4adaa611 CM	328	int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
4adaa611 CM	329	int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
c2790a2e JB	330	int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
	331	struct page *locked_page,
	332	unsigned long bits_to_clear,
	333	unsigned long page_ops);
88f794ed MX	334	struct bio *
	335	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	336	gfp_t gfp_flags);
9be3395b CM	337	struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
9be3395b CM	338	struct bio btrfs_bio_clone(struct bio bio, gfp_t gfp_mask);
4a54c8c1	339
3ec706c8	340	struct btrfs_fs_info;
4a54c8c1	341
3ec706c8	342	int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
4a54c8c1 JS	343	u64 length, u64 logical, struct page *page,
4a54c8c1 JS	344	int mirror_num);
87826df0	345	int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
ea466794 JB	346	int repair_eb_io_failure(struct btrfs_root root, struct extent_buffer eb,
ea466794 JB	347	int mirror_num);
294e30fe JB	348	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	349	noinline u64 find_lock_delalloc_range(struct inode *inode,
	350	struct extent_io_tree *tree,
	351	struct page locked_page, u64 start,
	352	u64 *end, u64 max_bytes);
	353	#endif
d1310b2e	354	#endif