extent_io.h 11.0 KB
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#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)
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#define EXTENT_BOUNDARY (1 << 9)
#define EXTENT_NODATASUM (1 << 10)
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#define EXTENT_DO_ACCOUNTING (1 << 11)
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#define EXTENT_FIRST_DELALLOC (1 << 12)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
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/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */
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#define EXTENT_BIO_COMPRESSED 1
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#define EXTENT_BIO_FLAG_SHIFT 16
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/* these are bit numbers for test/set bit */
#define EXTENT_BUFFER_UPTODATE 0
#define EXTENT_BUFFER_BLOCKING 1
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#define EXTENT_BUFFER_DIRTY 2
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#define EXTENT_BUFFER_CORRUPT 3
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/* these are flags for extent_clear_unlock_delalloc */
#define EXTENT_CLEAR_UNLOCK_PAGE 0x1
#define EXTENT_CLEAR_UNLOCK	 0x2
#define EXTENT_CLEAR_DELALLOC	 0x4
#define EXTENT_CLEAR_DIRTY	 0x8
#define EXTENT_SET_WRITEBACK	 0x10
#define EXTENT_END_WRITEBACK	 0x20
#define EXTENT_SET_PRIVATE2	 0x40
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#define EXTENT_CLEAR_ACCOUNTING  0x80
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/*
 * 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

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struct extent_state;

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

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

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;
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	/* ADD NEW ELEMENTS AFTER THIS */
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	struct extent_io_tree *tree;
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	wait_queue_head_t wq;
	atomic_t refs;
	unsigned long state;
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	u64 split_start;
	u64 split_end;
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	/* for use by the FS */
	u64 private;

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	struct list_head leak_list;
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};

struct extent_buffer {
	u64 start;
	unsigned long len;
	unsigned long map_start;
	unsigned long map_len;
	struct page *first_page;
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	unsigned long bflags;
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	struct list_head leak_list;
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	struct rcu_head rcu_head;
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	atomic_t refs;
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	/* count of read lock holders on the extent buffer */
	atomic_t write_locks;
	atomic_t read_locks;
	atomic_t blocking_writers;
	atomic_t blocking_readers;
	atomic_t spinning_readers;
	atomic_t spinning_writers;

	/* protects write locks */
	rwlock_t lock;

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

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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;
}

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struct extent_map_tree;

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

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

u64 count_range_bits(struct extent_io_tree *tree,
		     u64 *start, u64 search_end,
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		     u64 max_bytes, unsigned long bits, int contig);
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void free_extent_state(struct extent_state *state);
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int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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		   int bits, int filled, struct extent_state *cached_state);
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int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		      int bits, gfp_t mask);
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int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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		     int bits, int wake, int delete, struct extent_state **cached,
		     gfp_t mask);
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int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		    int bits, gfp_t mask);
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int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int exclusive_bits, u64 *failed_start,
		   struct extent_state **cached_state, gfp_t mask);
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int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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			struct extent_state **cached_state, gfp_t mask);
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int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
		   gfp_t mask);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
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			struct extent_state **cached_state, gfp_t mask);
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int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, int bits);
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struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
						 u64 start, int bits);
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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);
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int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
			      u64 start, u64 end, get_extent_t *get_extent,
			      int mode);
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int extent_writepages(struct extent_io_tree *tree,
		      struct address_space *mapping,
		      get_extent_t *get_extent,
		      struct writeback_control *wbc);
int extent_readpages(struct extent_io_tree *tree,
		     struct address_space *mapping,
		     struct list_head *pages, unsigned nr_pages,
		     get_extent_t get_extent);
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int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		__u64 start, __u64 len, get_extent_t *get_extent);
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int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
					  u64 start, unsigned long len,
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					  struct page *page0);
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struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
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					 u64 start, unsigned long len);
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void free_extent_buffer(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_io_tree *tree,
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			     struct extent_buffer *eb, u64 start, int wait,
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			     get_extent_t *get_extent, int mirror_num);
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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);
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int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
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int clear_extent_buffer_dirty(struct extent_io_tree *tree,
			      struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_io_tree *tree,
			     struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
			       struct extent_buffer *eb);
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int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
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				struct extent_buffer *eb,
				struct extent_state **cached_state);
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int extent_buffer_uptodate(struct extent_io_tree *tree,
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			   struct extent_buffer *eb,
			   struct extent_state *cached_state);
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int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
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		      unsigned long min_len, char **map,
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		      unsigned long *map_start,
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		      unsigned long *map_len);
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int extent_range_uptodate(struct extent_io_tree *tree,
			  u64 start, u64 end);
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int extent_clear_unlock_delalloc(struct inode *inode,
				struct extent_io_tree *tree,
				u64 start, u64 end, struct page *locked_page,
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				unsigned long op);
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struct bio *
btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
		gfp_t gfp_flags);
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#endif