[linux.git] / fs / btrfs / extent_io.h

#ifndef __EXTENTIO__
#define __EXTENTIO__

#include <linux/rbtree.h>
#include "ulist.h"

/* bits for the extent state */
#define EXTENT_DIRTY		(1U << 0)
#define EXTENT_WRITEBACK	(1U << 1)
#define EXTENT_UPTODATE		(1U << 2)
#define EXTENT_LOCKED		(1U << 3)
#define EXTENT_NEW		(1U << 4)
#define EXTENT_DELALLOC		(1U << 5)
#define EXTENT_DEFRAG		(1U << 6)
#define EXTENT_BOUNDARY		(1U << 9)
#define EXTENT_NODATASUM	(1U << 10)
#define EXTENT_DO_ACCOUNTING	(1U << 11)
#define EXTENT_FIRST_DELALLOC	(1U << 12)
#define EXTENT_NEED_WAIT	(1U << 13)
#define EXTENT_DAMAGED		(1U << 14)
#define EXTENT_NORESERVE	(1U << 15)
#define EXTENT_QGROUP_RESERVED	(1U << 16)
#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_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)
#define PAGE_SET_ERROR		(1 << 5)

/*
 * 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;
struct io_failure_record;

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);
	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 *bits);
	void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
			       unsigned *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;
	const 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 state;

	struct io_failure_record *failrec;

#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_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
};

/*
 * Structure to record how many bytes and which ranges are set/cleared
 */
struct extent_changeset {
	/* How many bytes are set/cleared in this operation */
	u64 bytes_changed;

	/* Changed ranges */
	struct ulist *range_changed;
};

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_bits(struct extent_io_tree *tree, u64 start, u64 end,
		     struct extent_state **cached);

static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
{
	return lock_extent_bits(tree, start, end, NULL);
}

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 __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 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 bits, int filled,
		   struct extent_state *cached_state);
int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		unsigned bits, struct extent_changeset *changeset);
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     unsigned bits, int wake, int delete,
		     struct extent_state **cached, gfp_t mask);

static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
{
	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
				GFP_NOFS);
}

static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached, gfp_t mask)
{
	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
				mask);
}

static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, unsigned bits)
{
	int wake = 0;

	if (bits & EXTENT_LOCKED)
		wake = 1;

	return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
			GFP_NOFS);
}

int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			   unsigned bits, struct extent_changeset *changeset);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   unsigned bits, u64 *failed_start,
		   struct extent_state **cached_state, gfp_t mask);

static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, unsigned bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
}

static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
				cached_state, mask);
}

static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
			      NULL, mask);
}

static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return clear_extent_bit(tree, start, end,
				EXTENT_DIRTY | EXTENT_DELALLOC |
				EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
}

int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       unsigned bits, unsigned clear_bits,
		       struct extent_state **cached_state);

static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_UPTODATE,
			      NULL, cached_state, GFP_NOFS);
}

static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
			      NULL, cached_state, GFP_NOFS);
}

static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
			GFP_NOFS);
}

static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
			      cached_state, mask);
}

int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, unsigned 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);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
					  u64 start);
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						  u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						u64 start);
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_SIZE - 1) >> PAGE_SHIFT) -
		(start >> PAGE_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);
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
			   unsigned long pos);
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
			      unsigned long pos, unsigned long len);
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
				unsigned long pos, unsigned long len);
void clear_extent_buffer_dirty(struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_buffer *eb);
void set_extent_buffer_uptodate(struct extent_buffer *eb);
void 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);
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
				 struct page *locked_page,
				 unsigned 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);
void 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);
#endif
Commit	Line	Data
d1310b2e CM	1	#ifndef __EXTENTIO__
	2	#define __EXTENTIO__
	3
	4	#include <linux/rbtree.h>
ac467772	5	#include "ulist.h"
d1310b2e CM	6
d1310b2e CM	7	/* bits for the extent state */
9ee49a04 DS	8	#define EXTENT_DIRTY (1U << 0)
	9	#define EXTENT_WRITEBACK (1U << 1)
	10	#define EXTENT_UPTODATE (1U << 2)
	11	#define EXTENT_LOCKED (1U << 3)
	12	#define EXTENT_NEW (1U << 4)
	13	#define EXTENT_DELALLOC (1U << 5)
	14	#define EXTENT_DEFRAG (1U << 6)
	15	#define EXTENT_BOUNDARY (1U << 9)
	16	#define EXTENT_NODATASUM (1U << 10)
	17	#define EXTENT_DO_ACCOUNTING (1U << 11)
	18	#define EXTENT_FIRST_DELALLOC (1U << 12)
	19	#define EXTENT_NEED_WAIT (1U << 13)
	20	#define EXTENT_DAMAGED (1U << 14)
	21	#define EXTENT_NORESERVE (1U << 15)
52472553	22	#define EXTENT_QGROUP_RESERVED (1U << 16)
9ee49a04 DS	23	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
9ee49a04 DS	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
261507a0	32	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	33
b4ce94de CM	34	/* these are bit numbers for test/set bit */
b4ce94de CM	35	#define EXTENT_BUFFER_UPTODATE 0
b9473439	36	#define EXTENT_BUFFER_DIRTY 2
a826d6dc	37	#define EXTENT_BUFFER_CORRUPT 3
ab0fff03	38	#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
3083ee2e JB	39	#define EXTENT_BUFFER_TREE_REF 5
3083ee2e JB	40	#define EXTENT_BUFFER_STALE 6
0b32f4bb	41	#define EXTENT_BUFFER_WRITEBACK 7
656f30db	42	#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
815a51c7	43	#define EXTENT_BUFFER_DUMMY 9
34b41ace	44	#define EXTENT_BUFFER_IN_TREE 10
656f30db	45	#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
b4ce94de	46
a791e35e	47	/* these are flags for extent_clear_unlock_delalloc */
c2790a2e JB	48	#define PAGE_UNLOCK (1 << 0)
	49	#define PAGE_CLEAR_DIRTY (1 << 1)
	50	#define PAGE_SET_WRITEBACK (1 << 2)
	51	#define PAGE_END_WRITEBACK (1 << 3)
	52	#define PAGE_SET_PRIVATE2 (1 << 4)
704de49d	53	#define PAGE_SET_ERROR (1 << 5)
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
d1310b2e	60
70dec807	61	struct extent_state;
ea466794	62	struct btrfs_root;
facc8a22	63	struct btrfs_io_bio;
47dc196a	64	struct io_failure_record;
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);
44b8bd7e	74	extent_submit_bio_hook_t *submit_bio_hook;
64a16701	75	int (merge_bio_hook)(int rw, struct page page, unsigned long offset,
c8b97818 CM	76	size_t size, struct bio *bio,
c8b97818 CM	77	unsigned long bio_flags);
ea466794	78	int (readpage_io_failed_hook)(struct page page, int failed_mirror);
facc8a22 MX	79	int (readpage_end_io_hook)(struct btrfs_io_bio io_bio, u64 phy_offset,
	80	struct page *page, u64 start, u64 end,
	81	int mirror);
1259ab75	82	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	83	struct extent_state *state, int uptodate);
1bf85046	84	void (set_bit_hook)(struct inode inode, struct extent_state *state,
9ee49a04	85	unsigned *bits);
1bf85046	86	void (clear_bit_hook)(struct inode inode, struct extent_state *state,
9ee49a04	87	unsigned *bits);
1bf85046 JM	88	void (merge_extent_hook)(struct inode inode,
	89	struct extent_state *new,
	90	struct extent_state *other);
	91	void (split_extent_hook)(struct inode inode,
	92	struct extent_state *orig, u64 split);
d1310b2e CM	93	};
	94
	95	struct extent_io_tree {
	96	struct rb_root state;
	97	struct address_space *mapping;
	98	u64 dirty_bytes;
0b32f4bb	99	int track_uptodate;
70dec807	100	spinlock_t lock;
e8c9f186	101	const struct extent_io_ops *ops;
d1310b2e CM	102	};
	103
	104	struct extent_state {
	105	u64 start;
	106	u64 end; /* inclusive */
d1310b2e	107	struct rb_node rb_node;
9ed74f2d JB	108
9ed74f2d JB	109	/* ADD NEW ELEMENTS AFTER THIS */
d1310b2e CM	110	wait_queue_head_t wq;
d1310b2e CM	111	atomic_t refs;
9ee49a04	112	unsigned state;
d1310b2e	113
47dc196a	114	struct io_failure_record *failrec;
d1310b2e	115
6d49ba1b	116	#ifdef CONFIG_BTRFS_DEBUG
2d2ae547	117	struct list_head leak_list;
6d49ba1b	118	#endif
d1310b2e CM	119	};
d1310b2e CM	120
727011e0	121	#define INLINE_EXTENT_BUFFER_PAGES 16
09cbfeaf	122	#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
d1310b2e CM	123	struct extent_buffer {
	124	u64 start;
	125	unsigned long len;
b4ce94de	126	unsigned long bflags;
f28491e0	127	struct btrfs_fs_info *fs_info;
3083ee2e	128	spinlock_t refs_lock;
727011e0	129	atomic_t refs;
0b32f4bb	130	atomic_t io_pages;
5cf1ab56	131	int read_mirror;
19fe0a8b	132	struct rcu_head rcu_head;
5b25f70f	133	pid_t lock_owner;
b4ce94de	134
bd681513 CM	135	/* count of read lock holders on the extent buffer */
	136	atomic_t write_locks;
	137	atomic_t read_locks;
	138	atomic_t blocking_writers;
	139	atomic_t blocking_readers;
	140	atomic_t spinning_readers;
	141	atomic_t spinning_writers;
656f30db FM	142	short lock_nested;
	143	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	144	short log_index;
bd681513 CM	145
	146	/* protects write locks */
	147	rwlock_t lock;
	148
	149	/* readers use lock_wq while they wait for the write
	150	* lock holders to unlock
	151	*/
	152	wait_queue_head_t write_lock_wq;
b4ce94de	153
bd681513 CM	154	/* writers use read_lock_wq while they wait for readers
bd681513 CM	155	* to unlock
b4ce94de	156	*/
bd681513	157	wait_queue_head_t read_lock_wq;
b8dae313	158	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b ES	159	#ifdef CONFIG_BTRFS_DEBUG
	160	struct list_head leak_list;
	161	#endif
d1310b2e CM	162	};
d1310b2e CM	163
ac467772 QW	164	/*
	165	* Structure to record how many bytes and which ranges are set/cleared
	166	*/
	167	struct extent_changeset {
	168	/* How many bytes are set/cleared in this operation */
	169	u64 bytes_changed;
	170
	171	/* Changed ranges */
	172	struct ulist *range_changed;
	173	};
	174
261507a0 LZ	175	static inline void extent_set_compress_type(unsigned long *bio_flags,
	176	int compress_type)
	177	{
	178	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	179	}
	180
	181	static inline int extent_compress_type(unsigned long bio_flags)
	182	{
	183	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	184	}
	185
d1310b2e CM	186	struct extent_map_tree;
	187
	188	typedef struct extent_map (get_extent_t)(struct inode inode,
	189	struct page *page,
306e16ce	190	size_t pg_offset,
d1310b2e CM	191	u64 start, u64 len,
	192	int create);
	193
	194	void extent_io_tree_init(struct extent_io_tree *tree,
f993c883	195	struct address_space *mapping);
d1310b2e	196	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	197	struct extent_io_tree tree, struct page page,
70dec807 CM	198	gfp_t mask);
f7a52a40	199	int try_release_extent_buffer(struct page *page);
1edbb734	200	int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
ff13db41	201	struct extent_state **cached);
cd716d8f DS	202
	203	static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
	204	{
	205	return lock_extent_bits(tree, start, end, NULL);
	206	}
	207
d0082371	208	int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
d1310b2e	209	int extent_read_full_page(struct extent_io_tree tree, struct page page,
8ddc7d9c	210	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	211	int __init extent_io_init(void);
	212	void extent_io_exit(void);
	213
	214	u64 count_range_bits(struct extent_io_tree *tree,
	215	u64 *start, u64 search_end,
9ee49a04	216	u64 max_bytes, unsigned bits, int contig);
d1310b2e	217
4845e44f	218	void free_extent_state(struct extent_state *state);
d1310b2e	219	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04	220	unsigned bits, int filled,
41074888	221	struct extent_state *cached_state);
fefdc557	222	int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
f734c44a	223	unsigned bits, struct extent_changeset *changeset);
e6dcd2dc	224	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04	225	unsigned bits, int wake, int delete,
41074888	226	struct extent_state **cached, gfp_t mask);
c6317955	227
e83b1d91 DS	228	static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
	229	{
	230	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
	231	GFP_NOFS);
	232	}
	233
	234	static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
	235	u64 end, struct extent_state **cached, gfp_t mask)
	236	{
	237	return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
	238	mask);
	239	}
	240
	241	static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
91166212	242	u64 end, unsigned bits)
e83b1d91 DS	243	{
	244	int wake = 0;
	245
	246	if (bits & EXTENT_LOCKED)
	247	wake = 1;
	248
91166212 DS	249	return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
91166212 DS	250	GFP_NOFS);
e83b1d91 DS	251	}
e83b1d91 DS	252
d38ed27f	253	int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
2c53b912	254	unsigned bits, struct extent_changeset *changeset);
4845e44f	255	int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04	256	unsigned bits, u64 *failed_start,
4845e44f	257	struct extent_state **cached_state, gfp_t mask);
c6317955 DS	258
c6317955 DS	259	static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
ceeb0ae7	260	u64 end, unsigned bits)
c6317955	261	{
ceeb0ae7	262	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
c6317955 DS	263	}
c6317955 DS	264
e83b1d91 DS	265	static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
	266	u64 end, struct extent_state **cached_state, gfp_t mask)
	267	{
	268	return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
	269	cached_state, mask);
	270	}
c6317955 DS	271
	272	static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
	273	u64 end, gfp_t mask)
	274	{
	275	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
	276	NULL, mask);
	277	}
	278
e83b1d91	279	static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
af6f8f60	280	u64 end)
e83b1d91 DS	281	{
	282	return clear_extent_bit(tree, start, end,
	283	EXTENT_DIRTY \| EXTENT_DELALLOC \|
af6f8f60	284	EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
e83b1d91 DS	285	}
e83b1d91 DS	286
462d6fac	287	int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04	288	unsigned bits, unsigned clear_bits,
210aa277	289	struct extent_state **cached_state);
c6317955 DS	290
c6317955 DS	291	static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
7cd8c752	292	u64 end, struct extent_state **cached_state)
c6317955 DS	293	{
	294	return set_extent_bit(tree, start, end,
	295	EXTENT_DELALLOC \| EXTENT_UPTODATE,
7cd8c752	296	NULL, cached_state, GFP_NOFS);
c6317955 DS	297	}
	298
	299	static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
018ed4f7	300	u64 end, struct extent_state **cached_state)
c6317955 DS	301	{
	302	return set_extent_bit(tree, start, end,
	303	EXTENT_DELALLOC \| EXTENT_UPTODATE \| EXTENT_DEFRAG,
018ed4f7	304	NULL, cached_state, GFP_NOFS);
c6317955 DS	305	}
	306
	307	static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
3744dbeb	308	u64 end)
c6317955	309	{
3744dbeb DS	310	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
3744dbeb DS	311	GFP_NOFS);
c6317955 DS	312	}
	313
	314	static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
	315	u64 end, struct extent_state **cached_state, gfp_t mask)
	316	{
	317	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
	318	cached_state, mask);
	319	}
	320
d1310b2e	321	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
9ee49a04	322	u64 start_ret, u64 end_ret, unsigned bits,
e6138876	323	struct extent_state **cached_state);
d1310b2e CM	324	int extent_invalidatepage(struct extent_io_tree *tree,
	325	struct page *page, unsigned long offset);
	326	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	327	get_extent_t *get_extent,
	328	struct writeback_control *wbc);
771ed689 CM	329	int extent_write_locked_range(struct extent_io_tree tree, struct inode inode,
	330	u64 start, u64 end, get_extent_t *get_extent,
	331	int mode);
d1310b2e CM	332	int extent_writepages(struct extent_io_tree *tree,
	333	struct address_space *mapping,
	334	get_extent_t *get_extent,
	335	struct writeback_control *wbc);
0b32f4bb JB	336	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	337	struct writeback_control *wbc);
d1310b2e CM	338	int extent_readpages(struct extent_io_tree *tree,
	339	struct address_space *mapping,
	340	struct list_head *pages, unsigned nr_pages,
	341	get_extent_t get_extent);
1506fcc8 YS	342	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
1506fcc8 YS	343	__u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e CM	344	void set_page_extent_mapped(struct page *page);
d1310b2e CM	345
f28491e0	346	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
ce3e6984	347	u64 start);
0f331229 OS	348	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	349	u64 start, unsigned long len);
3f556f78	350	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229	351	u64 start);
815a51c7	352	struct extent_buffer btrfs_clone_extent_buffer(struct extent_buffer src);
f28491e0	353	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	354	u64 start);
d1310b2e	355	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	356	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	357	#define WAIT_NONE 0
	358	#define WAIT_COMPLETE 1
	359	#define WAIT_PAGE_LOCK 2
d1310b2e	360	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	361	struct extent_buffer *eb, u64 start, int wait,
f188591e	362	get_extent_t *get_extent, int mirror_num);
fd8b2b61	363	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
479ed9ab RD	364
	365	static inline unsigned long num_extent_pages(u64 start, u64 len)
	366	{
09cbfeaf KS	367	return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
09cbfeaf KS	368	(start >> PAGE_SHIFT);
479ed9ab RD	369	}
479ed9ab RD	370
d1310b2e CM	371	static inline void extent_buffer_get(struct extent_buffer *eb)
	372	{
	373	atomic_inc(&eb->refs);
	374	}
	375
	376	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	377	unsigned long start,
	378	unsigned long len);
	379	void read_extent_buffer(struct extent_buffer eb, void dst,
	380	unsigned long start,
	381	unsigned long len);
550ac1d8 GH	382	int read_extent_buffer_to_user(struct extent_buffer eb, void __user dst,
	383	unsigned long start,
	384	unsigned long len);
d1310b2e CM	385	void write_extent_buffer(struct extent_buffer eb, const void src,
	386	unsigned long start, unsigned long len);
	387	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	388	unsigned long dst_offset, unsigned long src_offset,
	389	unsigned long len);
	390	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	391	unsigned long src_offset, unsigned long len);
	392	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	393	unsigned long src_offset, unsigned long len);
	394	void memset_extent_buffer(struct extent_buffer *eb, char c,
	395	unsigned long start, unsigned long len);
3e1e8bb7 OS	396	int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
	397	unsigned long pos);
	398	void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
	399	unsigned long pos, unsigned long len);
	400	void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
	401	unsigned long pos, unsigned long len);
1d4284bd	402	void clear_extent_buffer_dirty(struct extent_buffer *eb);
0b32f4bb	403	int set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	404	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	405	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
0b32f4bb	406	int extent_buffer_uptodate(struct extent_buffer *eb);
a26e8c9f	407	int extent_buffer_under_io(struct extent_buffer *eb);
d1310b2e	408	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
a6591715	409	unsigned long min_len, char **map,
d1310b2e	410	unsigned long *map_start,
a6591715	411	unsigned long *map_len);
bd1fa4f0	412	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	413	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
a9d93e17	414	void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
c2790a2e	415	struct page *locked_page,
9ee49a04	416	unsigned bits_to_clear,
c2790a2e	417	unsigned long page_ops);
88f794ed MX	418	struct bio *
	419	btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
	420	gfp_t gfp_flags);
9be3395b CM	421	struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
9be3395b CM	422	struct bio btrfs_bio_clone(struct bio bio, gfp_t gfp_mask);
4a54c8c1	423
3ec706c8	424	struct btrfs_fs_info;
4a54c8c1	425
1203b681 MX	426	int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
	427	struct page *page, unsigned int pg_offset,
	428	int mirror_num);
8b110e39 MX	429	int clean_io_failure(struct inode inode, u64 start, struct page page,
8b110e39 MX	430	unsigned int pg_offset);
b5227c07	431	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
ea466794 JB	432	int repair_eb_io_failure(struct btrfs_root root, struct extent_buffer eb,
ea466794 JB	433	int mirror_num);
2fe6303e MX	434
	435	/*
	436	* When IO fails, either with EIO or csum verification fails, we
	437	* try other mirrors that might have a good copy of the data. This
	438	* io_failure_record is used to record state as we go through all the
	439	* mirrors. If another mirror has good data, the page is set up to date
	440	* and things continue. If a good mirror can't be found, the original
	441	* bio end_io callback is called to indicate things have failed.
	442	*/
	443	struct io_failure_record {
	444	struct page *page;
	445	u64 start;
	446	u64 len;
	447	u64 logical;
	448	unsigned long bio_flags;
	449	int this_mirror;
	450	int failed_mirror;
	451	int in_validation;
	452	};
	453
f612496b	454	void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
2fe6303e MX	455	int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
	456	struct io_failure_record **failrec_ret);
	457	int btrfs_check_repairable(struct inode inode, struct bio failed_bio,
	458	struct io_failure_record *failrec, int fail_mirror);
	459	struct bio btrfs_create_repair_bio(struct inode inode, struct bio *failed_bio,
	460	struct io_failure_record *failrec,
	461	struct page *page, int pg_offset, int icsum,
8b110e39 MX	462	bio_end_io_t endio_func, void data);
8b110e39 MX	463	int free_io_failure(struct inode inode, struct io_failure_record rec);
294e30fe JB	464	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	465	noinline u64 find_lock_delalloc_range(struct inode *inode,
	466	struct extent_io_tree *tree,
	467	struct page locked_page, u64 start,
	468	u64 *end, u64 max_bytes);
0d4cf4e6	469	#endif
faa2dbf0	470	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
ce3e6984	471	u64 start);
294e30fe	472	#endif