[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 (*submit_bio_hook)(struct inode *inode, int rw, struct bio *bio);
	int (*merge_bio_hook)(struct page *page, unsigned long offset,
			      size_t size, struct bio *bio);
	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;

static inline struct extent_state *extent_state_next(struct extent_state *state)
{
	struct rb_node *node;
	node = rb_next(&state->rb_node);
	if (!node)
		return NULL;
	return rb_entry(node, struct extent_state, rb_node);
}

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);
struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
						 u64 start, 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,
			     get_extent_t *get_extent);

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);
0b86a832	31	int (submit_bio_hook)(struct inode inode, int rw, struct bio *bio);
239b14b3 CM	32	int (merge_bio_hook)(struct page page, unsigned long offset,
239b14b3 CM	33	size_t size, struct bio *bio);
d1310b2e	34	int (readpage_io_hook)(struct page page, u64 start, u64 end);
70dec807 CM	35	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
	36	struct extent_state *state);
	37	void (writepage_end_io_hook)(struct page page, u64 start, u64 end,
	38	struct extent_state *state);
291d673e	39	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	40	unsigned long old, unsigned long bits);
291d673e	41	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	42	unsigned long old, unsigned long bits);
d1310b2e CM	43	};
	44
	45	struct extent_io_tree {
	46	struct rb_root state;
	47	struct address_space *mapping;
	48	u64 dirty_bytes;
70dec807	49	spinlock_t lock;
d1310b2e CM	50	struct extent_io_ops *ops;
	51	spinlock_t lru_lock;
	52	struct list_head buffer_lru;
	53	int lru_size;
80ea96b1	54	struct extent_state *last;
d1310b2e CM	55	};
	56
	57	struct extent_state {
	58	u64 start;
	59	u64 end; /* inclusive */
d1310b2e	60	struct rb_node rb_node;
70dec807	61	struct extent_io_tree *tree;
d1310b2e CM	62	wait_queue_head_t wq;
	63	atomic_t refs;
	64	unsigned long state;
	65
	66	/* for use by the FS */
	67	u64 private;
	68
	69	struct list_head list;
	70	};
	71
	72	struct extent_buffer {
	73	u64 start;
	74	unsigned long len;
	75	char *map_token;
	76	char *kaddr;
	77	unsigned long map_start;
	78	unsigned long map_len;
	79	struct page *first_page;
	80	struct list_head lru;
	81	atomic_t refs;
	82	int flags;
	83	};
	84
	85	struct extent_map_tree;
	86
d7fc640e CM	87	static inline struct extent_state extent_state_next(struct extent_state state)
	88	{
	89	struct rb_node *node;
	90	node = rb_next(&state->rb_node);
	91	if (!node)
	92	return NULL;
	93	return rb_entry(node, struct extent_state, rb_node);
	94	}
	95
d1310b2e CM	96	typedef struct extent_map (get_extent_t)(struct inode inode,
	97	struct page *page,
	98	size_t page_offset,
	99	u64 start, u64 len,
	100	int create);
	101
	102	void extent_io_tree_init(struct extent_io_tree *tree,
	103	struct address_space *mapping, gfp_t mask);
	104	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	105	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	106	struct extent_io_tree tree, struct page page,
70dec807 CM	107	gfp_t mask);
d1310b2e CM	108	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	109	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	110	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	111	get_extent_t *get_extent);
	112	int __init extent_io_init(void);
	113	void extent_io_exit(void);
	114
	115	u64 count_range_bits(struct extent_io_tree *tree,
	116	u64 *start, u64 search_end,
	117	u64 max_bytes, unsigned long bits);
	118
	119	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	120	int bits, int filled);
	121	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	122	int bits, gfp_t mask);
	123	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	124	int bits, gfp_t mask);
	125	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	126	gfp_t mask);
	127	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	128	gfp_t mask);
	129	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	130	gfp_t mask);
	131	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	132	gfp_t mask);
	133	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
	134	gfp_t mask);
	135	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
	136	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	137	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	138	u64 start, int bits);
d1310b2e CM	139	int extent_invalidatepage(struct extent_io_tree *tree,
	140	struct page *page, unsigned long offset);
	141	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	142	get_extent_t *get_extent,
	143	struct writeback_control *wbc);
	144	int extent_writepages(struct extent_io_tree *tree,
	145	struct address_space *mapping,
	146	get_extent_t *get_extent,
	147	struct writeback_control *wbc);
	148	int extent_readpages(struct extent_io_tree *tree,
	149	struct address_space *mapping,
	150	struct list_head *pages, unsigned nr_pages,
	151	get_extent_t get_extent);
	152	int extent_prepare_write(struct extent_io_tree *tree,
	153	struct inode inode, struct page page,
	154	unsigned from, unsigned to, get_extent_t *get_extent);
	155	int extent_commit_write(struct extent_io_tree *tree,
	156	struct inode inode, struct page page,
	157	unsigned from, unsigned to);
	158	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	159	get_extent_t *get_extent);
	160	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	161	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	162	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	163	void set_page_extent_mapped(struct page *page);
	164
	165	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	166	u64 start, unsigned long len,
	167	struct page *page0,
	168	gfp_t mask);
	169	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	170	u64 start, unsigned long len,
	171	gfp_t mask);
	172	void free_extent_buffer(struct extent_buffer *eb);
	173	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7 CM	174	struct extent_buffer *eb, u64 start, int wait,
a86c12c7 CM	175	get_extent_t *get_extent);
d1310b2e CM	176
	177	static inline void extent_buffer_get(struct extent_buffer *eb)
	178	{
	179	atomic_inc(&eb->refs);
	180	}
	181
	182	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	183	unsigned long start,
	184	unsigned long len);
	185	void read_extent_buffer(struct extent_buffer eb, void dst,
	186	unsigned long start,
	187	unsigned long len);
	188	void write_extent_buffer(struct extent_buffer eb, const void src,
	189	unsigned long start, unsigned long len);
	190	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	191	unsigned long dst_offset, unsigned long src_offset,
	192	unsigned long len);
	193	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	194	unsigned long src_offset, unsigned long len);
	195	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	196	unsigned long src_offset, unsigned long len);
	197	void memset_extent_buffer(struct extent_buffer *eb, char c,
	198	unsigned long start, unsigned long len);
	199	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	200	struct extent_buffer *eb);
	201	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	202	struct extent_buffer *eb);
	203	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	204	struct extent_buffer *eb);
	205	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	206	struct extent_buffer *eb);
	207	int extent_buffer_uptodate(struct extent_io_tree *tree,
	208	struct extent_buffer *eb);
	209	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	210	unsigned long min_len, char token, char map,
	211	unsigned long *map_start,
	212	unsigned long *map_len, int km);
	213	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	214	unsigned long min_len, char token, char map,
	215	unsigned long *map_start,
	216	unsigned long *map_len, int km);
	217	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
	218	#endif