[net-next-2.6.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_CSUM (1 << 9)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)

/*
 * 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 extent_io_ops {
	int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end,
				    struct extent_state *state);
	void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
				      struct extent_state *state);
	int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
			    unsigned long old, unsigned long bits);
	int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
			    unsigned long old, unsigned long bits);
};

struct extent_io_tree {
	struct rb_root state;
	struct address_space *mapping;
	u64 dirty_bytes;
	spinlock_t lock;
	struct extent_io_ops *ops;
	spinlock_t lru_lock;
	struct list_head buffer_lru;
	int lru_size;
	struct extent_state *last;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;
	struct extent_io_tree *tree;
	wait_queue_head_t wq;
	atomic_t refs;
	unsigned long state;

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

	struct list_head list;
};

struct extent_buffer {
	u64 start;
	unsigned long len;
	char *map_token;
	char *kaddr;
	unsigned long map_start;
	unsigned long map_len;
	struct page *first_page;
	struct list_head lru;
	atomic_t refs;
	int flags;
};

struct extent_map_tree;

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

void extent_io_tree_init(struct extent_io_tree *tree,
			  struct address_space *mapping, gfp_t mask);
void extent_io_tree_empty_lru(struct extent_io_tree *tree);
int try_release_extent_mapping(struct extent_map_tree *map,
			       struct extent_io_tree *tree, struct page *page,
			       gfp_t mask);
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent);
int __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 test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   int bits, int filled);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		      int bits, gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
		    int bits, gfp_t mask);
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
			gfp_t mask);
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
		   gfp_t mask);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, int bits);
int extent_invalidatepage(struct extent_io_tree *tree,
			  struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
			  get_extent_t *get_extent,
			  struct writeback_control *wbc);
int extent_writepages(struct extent_io_tree *tree,
		      struct address_space *mapping,
		      get_extent_t *get_extent,
		      struct writeback_control *wbc);
int extent_readpages(struct extent_io_tree *tree,
		     struct address_space *mapping,
		     struct list_head *pages, unsigned nr_pages,
		     get_extent_t get_extent);
int extent_prepare_write(struct extent_io_tree *tree,
			 struct inode *inode, struct page *page,
			 unsigned from, unsigned to, get_extent_t *get_extent);
int extent_commit_write(struct extent_io_tree *tree,
			struct inode *inode, struct page *page,
			unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
		get_extent_t *get_extent);
int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
					  u64 start, unsigned long len,
					  struct page *page0,
					  gfp_t mask);
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
					 u64 start, unsigned long len,
					  gfp_t mask);
void free_extent_buffer(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_io_tree *tree,
			     struct extent_buffer *eb, u64 start, int wait);

static inline void extent_buffer_get(struct extent_buffer *eb)
{
	atomic_inc(&eb->refs);
}

int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
			  unsigned long start,
			  unsigned long len);
void read_extent_buffer(struct extent_buffer *eb, void *dst,
			unsigned long start,
			unsigned long len);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
			unsigned long dst_offset, unsigned long src_offset,
			unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
			  unsigned long start, unsigned long len);
int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
				    struct extent_buffer *eb);
int clear_extent_buffer_dirty(struct extent_io_tree *tree,
			      struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_io_tree *tree,
			     struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
			       struct extent_buffer *eb);
int extent_buffer_uptodate(struct extent_io_tree *tree,
			   struct extent_buffer *eb);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
		      unsigned long min_len, char **token, char **map,
		      unsigned long *map_start,
		      unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
#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)
	16	#define EXTENT_CSUM (1 << 9)
	17	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	18
	19	/*
	20	* page->private values. Every page that is controlled by the extent
	21	* map has page->private set to one.
	22	*/
	23	#define EXTENT_PAGE_PRIVATE 1
	24	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	25
70dec807 CM	26	struct extent_state;
70dec807 CM	27
d1310b2e CM	28	struct extent_io_ops {
	29	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	30	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	31	int (readpage_io_hook)(struct page page, u64 start, u64 end);
70dec807 CM	32	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
	33	struct extent_state *state);
	34	void (writepage_end_io_hook)(struct page page, u64 start, u64 end,
	35	struct extent_state *state);
291d673e	36	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	37	unsigned long old, unsigned long bits);
291d673e	38	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	39	unsigned long old, unsigned long bits);
d1310b2e CM	40	};
	41
	42	struct extent_io_tree {
	43	struct rb_root state;
	44	struct address_space *mapping;
	45	u64 dirty_bytes;
70dec807	46	spinlock_t lock;
d1310b2e CM	47	struct extent_io_ops *ops;
	48	spinlock_t lru_lock;
	49	struct list_head buffer_lru;
	50	int lru_size;
80ea96b1	51	struct extent_state *last;
d1310b2e CM	52	};
	53
	54	struct extent_state {
	55	u64 start;
	56	u64 end; /* inclusive */
d1310b2e	57	struct rb_node rb_node;
70dec807	58	struct extent_io_tree *tree;
d1310b2e CM	59	wait_queue_head_t wq;
	60	atomic_t refs;
	61	unsigned long state;
	62
	63	/* for use by the FS */
	64	u64 private;
	65
	66	struct list_head list;
	67	};
	68
	69	struct extent_buffer {
	70	u64 start;
	71	unsigned long len;
	72	char *map_token;
	73	char *kaddr;
	74	unsigned long map_start;
	75	unsigned long map_len;
	76	struct page *first_page;
	77	struct list_head lru;
	78	atomic_t refs;
	79	int flags;
	80	};
	81
	82	struct extent_map_tree;
	83
	84	typedef struct extent_map (get_extent_t)(struct inode inode,
	85	struct page *page,
	86	size_t page_offset,
	87	u64 start, u64 len,
	88	int create);
	89
	90	void extent_io_tree_init(struct extent_io_tree *tree,
	91	struct address_space *mapping, gfp_t mask);
	92	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	93	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	94	struct extent_io_tree tree, struct page page,
70dec807 CM	95	gfp_t mask);
d1310b2e CM	96	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	97	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	98	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	99	get_extent_t *get_extent);
	100	int __init extent_io_init(void);
	101	void extent_io_exit(void);
	102
	103	u64 count_range_bits(struct extent_io_tree *tree,
	104	u64 *start, u64 search_end,
	105	u64 max_bytes, unsigned long bits);
	106
	107	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	108	int bits, int filled);
	109	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	110	int bits, gfp_t mask);
	111	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	112	int bits, gfp_t mask);
	113	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	114	gfp_t mask);
	115	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	116	gfp_t mask);
	117	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	118	gfp_t mask);
	119	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	120	gfp_t mask);
	121	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
	122	gfp_t mask);
	123	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
	124	u64 start_ret, u64 end_ret, int bits);
	125	int extent_invalidatepage(struct extent_io_tree *tree,
	126	struct page *page, unsigned long offset);
	127	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	128	get_extent_t *get_extent,
	129	struct writeback_control *wbc);
	130	int extent_writepages(struct extent_io_tree *tree,
	131	struct address_space *mapping,
	132	get_extent_t *get_extent,
	133	struct writeback_control *wbc);
	134	int extent_readpages(struct extent_io_tree *tree,
	135	struct address_space *mapping,
	136	struct list_head *pages, unsigned nr_pages,
	137	get_extent_t get_extent);
	138	int extent_prepare_write(struct extent_io_tree *tree,
	139	struct inode inode, struct page page,
	140	unsigned from, unsigned to, get_extent_t *get_extent);
	141	int extent_commit_write(struct extent_io_tree *tree,
	142	struct inode inode, struct page page,
	143	unsigned from, unsigned to);
	144	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	145	get_extent_t *get_extent);
	146	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	147	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	148	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	149	void set_page_extent_mapped(struct page *page);
	150
	151	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	152	u64 start, unsigned long len,
	153	struct page *page0,
	154	gfp_t mask);
	155	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	156	u64 start, unsigned long len,
	157	gfp_t mask);
	158	void free_extent_buffer(struct extent_buffer *eb);
	159	int read_extent_buffer_pages(struct extent_io_tree *tree,
160	struct extent_buffer *eb, u64 start, int wait);
161
162	static inline void extent_buffer_get(struct extent_buffer *eb)
163	{
164	atomic_inc(&eb->refs);
165	}
166
167	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
168	unsigned long start,
169	unsigned long len);
170	void read_extent_buffer(struct extent_buffer eb, void dst,
171	unsigned long start,
172	unsigned long len);
173	void write_extent_buffer(struct extent_buffer eb, const void src,
174	unsigned long start, unsigned long len);
175	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
176	unsigned long dst_offset, unsigned long src_offset,
177	unsigned long len);
178	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
179	unsigned long src_offset, unsigned long len);
180	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
181	unsigned long src_offset, unsigned long len);
182	void memset_extent_buffer(struct extent_buffer *eb, char c,
183	unsigned long start, unsigned long len);
184	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
185	struct extent_buffer *eb);
186	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
187	struct extent_buffer *eb);
188	int set_extent_buffer_dirty(struct extent_io_tree *tree,
189	struct extent_buffer *eb);
190	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
191	struct extent_buffer *eb);
192	int extent_buffer_uptodate(struct extent_io_tree *tree,
193	struct extent_buffer *eb);
194	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
195	unsigned long min_len, char token, char map,
196	unsigned long *map_start,
197	unsigned long *map_len, int km);
198	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
199	unsigned long min_len, char token, char map,
200	unsigned long *map_start,
201	unsigned long *map_len, int km);
202	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
203	#endif