[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_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_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_READ_ERR 8        /* read IO error */
#define EXTENT_BUFFER_DUMMY 9
#define EXTENT_BUFFER_IN_TREE 10
#define EXTENT_BUFFER_WRITE_ERR 11    /* write IO error */

/* 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

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 */
	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 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;
	short lock_nested;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	short log_index;

	/* 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;
	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 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);
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *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 inode *inode, u64 start, u64 length, u64 logical,
		      struct page *page, unsigned int pg_offset,
		      int mirror_num);
int clean_io_failure(struct inode *inode, u64 start, struct page *page,
		     unsigned int pg_offset);
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);

/*
 * When IO fails, either with EIO or csum verification fails, we
 * try other mirrors that might have a good copy of the data.  This
 * io_failure_record is used to record state as we go through all the
 * mirrors.  If another mirror has good data, the page is set up to date
 * and things continue.  If a good mirror can't be found, the original
 * bio end_io callback is called to indicate things have failed.
 */
struct io_failure_record {
	struct page *page;
	u64 start;
	u64 len;
	u64 logical;
	unsigned long bio_flags;
	int this_mirror;
	int failed_mirror;
	int in_validation;
};

void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
				struct io_failure_record **failrec_ret);
int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
			   struct io_failure_record *failrec, int fail_mirror);
struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
				    struct io_failure_record *failrec,
				    struct page *page, int pg_offset, int icsum,
				    bio_end_io_t *endio_func, void *data);
int free_io_failure(struct inode *inode, struct io_failure_record *rec);
#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
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
					       u64 start, unsigned long len);
#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)
8b62b72b CM	14	#define EXTENT_BOUNDARY (1 << 9)
8b62b72b CM	15	#define EXTENT_NODATASUM (1 << 10)
32c00aff	16	#define EXTENT_DO_ACCOUNTING (1 << 11)
0ca1f7ce	17	#define EXTENT_FIRST_DELALLOC (1 << 12)
1728366e	18	#define EXTENT_NEED_WAIT (1 << 13)
806468f8	19	#define EXTENT_DAMAGED (1 << 14)
7ee9e440	20	#define EXTENT_NORESERVE (1 << 15)
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
de0022b9	29	#define EXTENT_BIO_TREE_LOG 2
4b384318	30	#define EXTENT_BIO_PARENT_LOCKED 4
261507a0	31	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	32
b4ce94de CM	33	/* these are bit numbers for test/set bit */
b4ce94de CM	34	#define EXTENT_BUFFER_UPTODATE 0
b9473439	35	#define EXTENT_BUFFER_DIRTY 2
a826d6dc	36	#define EXTENT_BUFFER_CORRUPT 3
ab0fff03	37	#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
3083ee2e JB	38	#define EXTENT_BUFFER_TREE_REF 5
3083ee2e JB	39	#define EXTENT_BUFFER_STALE 6
0b32f4bb	40	#define EXTENT_BUFFER_WRITEBACK 7
656f30db	41	#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
815a51c7	42	#define EXTENT_BUFFER_DUMMY 9
34b41ace	43	#define EXTENT_BUFFER_IN_TREE 10
656f30db	44	#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
b4ce94de	45
a791e35e	46	/* these are flags for extent_clear_unlock_delalloc */
c2790a2e JB	47	#define PAGE_UNLOCK (1 << 0)
	48	#define PAGE_CLEAR_DIRTY (1 << 1)
	49	#define PAGE_SET_WRITEBACK (1 << 2)
	50	#define PAGE_END_WRITEBACK (1 << 3)
	51	#define PAGE_SET_PRIVATE2 (1 << 4)
a791e35e	52
d1310b2e CM	53	/*
	54	* page->private values. Every page that is controlled by the extent
	55	* map has page->private set to one.
	56	*/
	57	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	58
70dec807	59	struct extent_state;
ea466794	60	struct btrfs_root;
facc8a22	61	struct btrfs_io_bio;
70dec807	62
44b8bd7e	63	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818	64	struct bio *bio, int mirror_num,
eaf25d93	65	unsigned long bio_flags, u64 bio_offset);
d1310b2e	66	struct extent_io_ops {
c8b97818	67	int (fill_delalloc)(struct inode inode, struct page *locked_page,
771ed689 CM	68	u64 start, u64 end, int *page_started,
771ed689 CM	69	unsigned long *nr_written);
247e743c	70	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	71	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	72	extent_submit_bio_hook_t *submit_bio_hook;
64a16701	73	int (merge_bio_hook)(int rw, struct page page, unsigned long offset,
c8b97818 CM	74	size_t size, struct bio *bio,
c8b97818 CM	75	unsigned long bio_flags);
ea466794	76	int (readpage_io_failed_hook)(struct page page, int failed_mirror);
facc8a22 MX	77	int (readpage_end_io_hook)(struct btrfs_io_bio io_bio, u64 phy_offset,
	78	struct page *page, u64 start, u64 end,
	79	int mirror);
1259ab75	80	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	81	struct extent_state *state, int uptodate);
1bf85046	82	void (set_bit_hook)(struct inode inode, struct extent_state *state,
41074888	83	unsigned long *bits);
1bf85046	84	void (clear_bit_hook)(struct inode inode, struct extent_state *state,
41074888	85	unsigned long *bits);
1bf85046 JM	86	void (merge_extent_hook)(struct inode inode,
	87	struct extent_state *new,
	88	struct extent_state *other);
	89	void (split_extent_hook)(struct inode inode,
	90	struct extent_state *orig, u64 split);
d1310b2e CM	91	};
	92
	93	struct extent_io_tree {
	94	struct rb_root state;
	95	struct address_space *mapping;
	96	u64 dirty_bytes;
0b32f4bb	97	int track_uptodate;
70dec807	98	spinlock_t 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 */
d1310b2e CM	108	wait_queue_head_t wq;
	109	atomic_t refs;
	110	unsigned long state;
	111
	112	/* for use by the FS */
	113	u64 private;
	114
6d49ba1b	115	#ifdef CONFIG_BTRFS_DEBUG
2d2ae547	116	struct list_head leak_list;
6d49ba1b	117	#endif
d1310b2e CM	118	};
d1310b2e CM	119
727011e0 CM	120	#define INLINE_EXTENT_BUFFER_PAGES 16
727011e0 CM	121	#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
d1310b2e CM	122	struct extent_buffer {
	123	u64 start;
	124	unsigned long len;
b4ce94de	125	unsigned long bflags;
f28491e0	126	struct btrfs_fs_info *fs_info;
3083ee2e	127	spinlock_t refs_lock;
727011e0	128	atomic_t refs;
0b32f4bb	129	atomic_t io_pages;
5cf1ab56	130	int read_mirror;
19fe0a8b	131	struct rcu_head rcu_head;
5b25f70f	132	pid_t lock_owner;
b4ce94de	133
bd681513 CM	134	/* count of read lock holders on the extent buffer */
	135	atomic_t write_locks;
	136	atomic_t read_locks;
	137	atomic_t blocking_writers;
	138	atomic_t blocking_readers;
	139	atomic_t spinning_readers;
	140	atomic_t spinning_writers;
656f30db FM	141	short lock_nested;
	142	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	143	short log_index;
bd681513 CM	144
	145	/* protects write locks */
	146	rwlock_t lock;
	147
	148	/* readers use lock_wq while they wait for the write
	149	* lock holders to unlock
	150	*/
	151	wait_queue_head_t write_lock_wq;
b4ce94de	152
bd681513 CM	153	/* writers use read_lock_wq while they wait for readers
bd681513 CM	154	* to unlock
b4ce94de	155	*/
bd681513	156	wait_queue_head_t read_lock_wq;
b8dae313	157	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	158	#ifdef CONFIG_BTRFS_DEBUG
	159	struct list_head leak_list;
	160	#endif
d1310b2e CM	161	};
d1310b2e CM	162
261507a0 LZ	163	static inline void extent_set_compress_type(unsigned long *bio_flags,
	164	int compress_type)
	165	{
	166	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	167	}
	168
	169	static inline int extent_compress_type(unsigned long bio_flags)
	170	{
	171	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	172	}
	173
d1310b2e CM	174	struct extent_map_tree;
	175
	176	typedef struct extent_map (get_extent_t)(struct inode inode,
	177	struct page *page,
306e16ce	178	size_t pg_offset,
d1310b2e CM	179	u64 start, u64 len,
	180	int create);
	181
	182	void extent_io_tree_init(struct extent_io_tree *tree,
f993c883	183	struct address_space *mapping);
d1310b2e	184	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	185	struct extent_io_tree tree, struct page page,
70dec807 CM	186	gfp_t mask);
f7a52a40	187	int try_release_extent_buffer(struct page *page);
d0082371	188	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
1edbb734	189	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	190	unsigned long bits, struct extent_state **cached);
d0082371	191	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end);
2ac55d41 JB	192	int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41 JB	193	struct extent_state **cached, gfp_t mask);
d0082371	194	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
d1310b2e	195	int extent_read_full_page(struct extent_io_tree tree, struct page page,
8ddc7d9c	196	get_extent_t *get_extent, int mirror_num);
4b384318 MF	197	int extent_read_full_page_nolock(struct extent_io_tree tree, struct page page,
4b384318 MF	198	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	199	int __init extent_io_init(void);
	200	void extent_io_exit(void);
	201
	202	u64 count_range_bits(struct extent_io_tree *tree,
	203	u64 *start, u64 search_end,
ec29ed5b	204	u64 max_bytes, unsigned long bits, int contig);
d1310b2e	205
4845e44f	206	void free_extent_state(struct extent_state *state);
d1310b2e	207	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888 DS	208	unsigned long bits, int filled,
41074888 DS	209	struct extent_state *cached_state);
d1310b2e	210	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	211	unsigned long bits, gfp_t mask);
e6dcd2dc	212	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888 DS	213	unsigned long bits, int wake, int delete,
41074888 DS	214	struct extent_state **cached, gfp_t mask);
d1310b2e	215	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
41074888	216	unsigned long bits, gfp_t mask);
4845e44f	217	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888	218	unsigned long bits, u64 *failed_start,
4845e44f	219	struct extent_state **cached_state, gfp_t mask);
d1310b2e	220	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
507903b8	221	struct extent_state **cached_state, gfp_t mask);
5fd02043 JB	222	int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
5fd02043 JB	223	struct extent_state **cached_state, gfp_t mask);
d1310b2e CM	224	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	225	gfp_t mask);
	226	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	227	gfp_t mask);
	228	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	229	gfp_t mask);
462d6fac	230	int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
41074888	231	unsigned long bits, unsigned long clear_bits,
e6138876	232	struct extent_state **cached_state, gfp_t mask);
d1310b2e	233	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
2ac55d41	234	struct extent_state **cached_state, gfp_t mask);
9e8a4a8b LB	235	int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
9e8a4a8b LB	236	struct extent_state **cached_state, gfp_t mask);
d1310b2e	237	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
41074888	238	u64 start_ret, u64 end_ret, unsigned long bits,
e6138876	239	struct extent_state **cached_state);
d1310b2e CM	240	int extent_invalidatepage(struct extent_io_tree *tree,
	241	struct page *page, unsigned long offset);
	242	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	243	get_extent_t *get_extent,
	244	struct writeback_control *wbc);
771ed689 CM	245	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	246	u64 start, u64 end, get_extent_t *get_extent,
	247	int mode);
d1310b2e CM	248	int extent_writepages(struct extent_io_tree *tree,
	249	struct address_space *mapping,
	250	get_extent_t *get_extent,
	251	struct writeback_control *wbc);
0b32f4bb JB	252	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	253	struct writeback_control *wbc);
d1310b2e CM	254	int extent_readpages(struct extent_io_tree *tree,
	255	struct address_space *mapping,
	256	struct list_head *pages, unsigned nr_pages,
	257	get_extent_t get_extent);
1506fcc8 YS	258	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	259	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	260	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	261	void set_page_extent_mapped(struct page *page);
	262
f28491e0	263	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
727011e0	264	u64 start, unsigned long len);
815a51c7 JS	265	struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len);
815a51c7 JS	266	struct extent_buffer btrfs_clone_extent_buffer(struct extent_buffer src);
f28491e0	267	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	268	u64 start);
d1310b2e	269	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	270	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	271	#define WAIT_NONE 0
	272	#define WAIT_COMPLETE 1
	273	#define WAIT_PAGE_LOCK 2
d1310b2e	274	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	275	struct extent_buffer *eb, u64 start, int wait,
f188591e	276	get_extent_t *get_extent, int mirror_num);
fd8b2b61	277	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
479ed9ab RD	278
	279	static inline unsigned long num_extent_pages(u64 start, u64 len)
	280	{
	281	return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
	282	(start >> PAGE_CACHE_SHIFT);
	283	}
	284
d1310b2e CM	285	static inline void extent_buffer_get(struct extent_buffer *eb)
	286	{
	287	atomic_inc(&eb->refs);
	288	}
	289
	290	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	291	unsigned long start,
	292	unsigned long len);
	293	void read_extent_buffer(struct extent_buffer eb, void dst,
	294	unsigned long start,
	295	unsigned long len);
550ac1d8 GH	296	int read_extent_buffer_to_user(struct extent_buffer eb, void __user dst,
	297	unsigned long start,
	298	unsigned long len);
d1310b2e CM	299	void write_extent_buffer(struct extent_buffer eb, const void src,
	300	unsigned long start, unsigned long len);
	301	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	302	unsigned long dst_offset, unsigned long src_offset,
	303	unsigned long len);
	304	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	305	unsigned long src_offset, unsigned long len);
	306	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	307	unsigned long src_offset, unsigned long len);
	308	void memset_extent_buffer(struct extent_buffer *eb, char c,
	309	unsigned long start, unsigned long len);
1d4284bd	310	void clear_extent_buffer_dirty(struct extent_buffer *eb);
0b32f4bb JB	311	int set_extent_buffer_dirty(struct extent_buffer *eb);
	312	int set_extent_buffer_uptodate(struct extent_buffer *eb);
	313	int clear_extent_buffer_uptodate(struct extent_buffer *eb);
	314	int extent_buffer_uptodate(struct extent_buffer *eb);
a26e8c9f	315	int extent_buffer_under_io(struct extent_buffer *eb);
d1310b2e	316	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
a6591715	317	unsigned long min_len, char **map,
d1310b2e	318	unsigned long *map_start,
a6591715	319	unsigned long *map_len);
4adaa611 CM	320	int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
4adaa611 CM	321	int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
c2790a2e JB	322	int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
	323	struct page *locked_page,
	324	unsigned long bits_to_clear,
	325	unsigned long page_ops);
88f794ed MX	326	struct bio *
	327	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	328	gfp_t gfp_flags);
9be3395b CM	329	struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
9be3395b CM	330	struct bio btrfs_bio_clone(struct bio bio, gfp_t gfp_mask);
4a54c8c1	331
3ec706c8	332	struct btrfs_fs_info;
4a54c8c1	333
1203b681 MX	334	int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
	335	struct page *page, unsigned int pg_offset,
	336	int mirror_num);
8b110e39 MX	337	int clean_io_failure(struct inode inode, u64 start, struct page page,
8b110e39 MX	338	unsigned int pg_offset);
87826df0	339	int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
ea466794 JB	340	int repair_eb_io_failure(struct btrfs_root root, struct extent_buffer eb,
ea466794 JB	341	int mirror_num);
2fe6303e MX	342
	343	/*
	344	* When IO fails, either with EIO or csum verification fails, we
	345	* try other mirrors that might have a good copy of the data. This
	346	* io_failure_record is used to record state as we go through all the
	347	* mirrors. If another mirror has good data, the page is set up to date
	348	* and things continue. If a good mirror can't be found, the original
	349	* bio end_io callback is called to indicate things have failed.
	350	*/
	351	struct io_failure_record {
	352	struct page *page;
	353	u64 start;
	354	u64 len;
	355	u64 logical;
	356	unsigned long bio_flags;
	357	int this_mirror;
	358	int failed_mirror;
	359	int in_validation;
	360	};
	361
f612496b	362	void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
2fe6303e MX	363	int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
	364	struct io_failure_record **failrec_ret);
	365	int btrfs_check_repairable(struct inode inode, struct bio failed_bio,
	366	struct io_failure_record *failrec, int fail_mirror);
	367	struct bio btrfs_create_repair_bio(struct inode inode, struct bio *failed_bio,
	368	struct io_failure_record *failrec,
	369	struct page *page, int pg_offset, int icsum,
8b110e39 MX	370	bio_end_io_t endio_func, void data);
8b110e39 MX	371	int free_io_failure(struct inode inode, struct io_failure_record rec);
294e30fe JB	372	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	373	noinline u64 find_lock_delalloc_range(struct inode *inode,
	374	struct extent_io_tree *tree,
	375	struct page locked_page, u64 start,
	376	u64 *end, u64 max_bytes);
0d4cf4e6	377	#endif
faa2dbf0 JB	378	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
faa2dbf0 JB	379	u64 start, unsigned long len);
294e30fe	380	#endif