[linux-2.6-block.git] / fs / btrfs / extent_map.h

#ifndef __EXTENTMAP__
#define __EXTENTMAP__

#include <linux/rbtree.h>

#define EXTENT_MAP_HOLE (u64)-3
#define EXTENT_MAP_INLINE (u64)-2
#define EXTENT_MAP_DELALLOC (u64)-1

/* 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_map_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);
	void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
};

struct extent_map_tree {
	struct rb_root map;
	struct rb_root state;
	struct address_space *mapping;
	rwlock_t lock;
	struct extent_map_ops *ops;
	spinlock_t lru_lock;
	struct list_head buffer_lru;
	int lru_size;
};

/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
struct extent_map {
	u64 start;
	u64 end; /* inclusive */
	int in_tree;
	struct rb_node rb_node;
	/* block_start and block_end are in bytes */
	u64 block_start;
	u64 block_end; /* inclusive */
	struct block_device *bdev;
	atomic_t refs;
};

/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	int in_tree;
	struct rb_node rb_node;
	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;
};

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

void extent_map_tree_init(struct extent_map_tree *tree,
			  struct address_space *mapping, gfp_t mask);
void extent_map_tree_empty_lru(struct extent_map_tree *tree);
struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
					 u64 start, u64 end);
int add_extent_mapping(struct extent_map_tree *tree,
		       struct extent_map *em);
int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
struct extent_map *alloc_extent_map(gfp_t mask);
void free_extent_map(struct extent_map *em);
int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
			  get_extent_t *get_extent);
void __init extent_map_init(void);
void __exit extent_map_exit(void);

int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
		   int bits, int filled);
int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
		      int bits, gfp_t mask);
int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
		    int bits, gfp_t mask);
int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
			gfp_t mask);
int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
		   gfp_t mask);
int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
		     gfp_t mask);
int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, int bits);
int extent_invalidatepage(struct extent_map_tree *tree,
			  struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
			  get_extent_t *get_extent,
			  struct writeback_control *wbc);
int extent_prepare_write(struct extent_map_tree *tree,
			 struct inode *inode, struct page *page,
			 unsigned from, unsigned to, get_extent_t *get_extent);
int extent_commit_write(struct extent_map_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_map_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
					  u64 start, unsigned long len,
					  struct page *page0,
					  gfp_t mask);
struct extent_buffer *find_extent_buffer(struct extent_map_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_map_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_map_tree *tree,
				    struct extent_buffer *eb);
int clear_extent_buffer_dirty(struct extent_map_tree *tree,
			      struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_map_tree *tree,
			     struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_map_tree *tree,
			       struct extent_buffer *eb);
int extent_buffer_uptodate(struct extent_map_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
a52d9a80 CM	1	#ifndef __EXTENTMAP__
	2	#define __EXTENTMAP__
	3
	4	#include <linux/rbtree.h>
	5
5f39d397	6	#define EXTENT_MAP_HOLE (u64)-3
a52d9a80 CM	7	#define EXTENT_MAP_INLINE (u64)-2
	8	#define EXTENT_MAP_DELALLOC (u64)-1
	9
5f39d397 CM	10	/* bits for the extent state */
	11	#define EXTENT_DIRTY 1
	12	#define EXTENT_WRITEBACK (1 << 1)
	13	#define EXTENT_UPTODATE (1 << 2)
	14	#define EXTENT_LOCKED (1 << 3)
	15	#define EXTENT_NEW (1 << 4)
	16	#define EXTENT_DELALLOC (1 << 5)
6b80053d CM	17	#define EXTENT_DEFRAG (1 << 6)
6b80053d CM	18	#define EXTENT_DEFRAG_DONE (1 << 7)
4dc11904	19	#define EXTENT_BUFFER_FILLED (1 << 8)
19c00ddc	20	#define EXTENT_CSUM (1 << 9)
5f39d397 CM	21	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
5f39d397 CM	22
19c00ddc CM	23	/*
	24	* page->private values. Every page that is controlled by the extent
	25	* map has page->private set to one.
	26	*/
	27
	28	#define EXTENT_PAGE_PRIVATE 1
	29	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	30
5f39d397	31
07157aac CM	32	struct extent_map_ops {
	33	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	34	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	35	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	36	int (readpage_end_io_hook)(struct page page, u64 start, u64 end);
0e2752a7	37	void (writepage_end_io_hook)(struct page page, u64 start, u64 end);
07157aac CM	38	};
07157aac CM	39
a52d9a80 CM	40	struct extent_map_tree {
	41	struct rb_root map;
	42	struct rb_root state;
	43	struct address_space *mapping;
	44	rwlock_t lock;
07157aac	45	struct extent_map_ops *ops;
4dc11904 CM	46	spinlock_t lru_lock;
	47	struct list_head buffer_lru;
	48	int lru_size;
a52d9a80 CM	49	};
	50
	51	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	52	struct extent_map {
	53	u64 start;
	54	u64 end; /* inclusive */
	55	int in_tree;
	56	struct rb_node rb_node;
	57	/* block_start and block_end are in bytes */
	58	u64 block_start;
	59	u64 block_end; /* inclusive */
	60	struct block_device *bdev;
	61	atomic_t refs;
	62	};
	63
	64	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	65	struct extent_state {
	66	u64 start;
	67	u64 end; /* inclusive */
	68	int in_tree;
	69	struct rb_node rb_node;
	70	wait_queue_head_t wq;
	71	atomic_t refs;
	72	unsigned long state;
07157aac CM	73
	74	/* for use by the FS */
	75	u64 private;
	76
a52d9a80 CM	77	struct list_head list;
	78	};
	79
	80	struct extent_buffer {
	81	u64 start;
5f39d397	82	unsigned long len;
db94535d CM	83	char *map_token;
	84	char *kaddr;
	85	unsigned long map_start;
	86	unsigned long map_len;
810191ff	87	struct page *first_page;
4dc11904 CM	88	struct list_head lru;
	89	atomic_t refs;
	90	int flags;
a52d9a80 CM	91	};
	92
	93	typedef struct extent_map (get_extent_t)(struct inode inode,
	94	struct page *page,
	95	size_t page_offset,
	96	u64 start, u64 end,
	97	int create);
	98
	99	void extent_map_tree_init(struct extent_map_tree *tree,
	100	struct address_space *mapping, gfp_t mask);
19c00ddc	101	void extent_map_tree_empty_lru(struct extent_map_tree *tree);
a52d9a80 CM	102	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
	103	u64 start, u64 end);
	104	int add_extent_mapping(struct extent_map_tree *tree,
	105	struct extent_map *em);
	106	int remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
	107	int try_release_extent_mapping(struct extent_map_tree tree, struct page page);
	108	int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	109	int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	110	struct extent_map *alloc_extent_map(gfp_t mask);
	111	void free_extent_map(struct extent_map *em);
	112	int extent_read_full_page(struct extent_map_tree tree, struct page page,
	113	get_extent_t *get_extent);
	114	void __init extent_map_init(void);
	115	void __exit extent_map_exit(void);
1a5bc167 CM	116
	117	int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
	118	int bits, int filled);
96b5179d CM	119	int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	120	int bits, gfp_t mask);
	121	int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	122	int bits, gfp_t mask);
a52d9a80 CM	123	int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
	124	gfp_t mask);
	125	int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
	126	gfp_t mask);
	127	int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
	128	gfp_t mask);
5f39d397 CM	129	int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
5f39d397 CM	130	gfp_t mask);
b888db2b CM	131	int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
b888db2b CM	132	gfp_t mask);
5f39d397 CM	133	int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
5f39d397 CM	134	u64 start_ret, u64 end_ret, int bits);
a52d9a80 CM	135	int extent_invalidatepage(struct extent_map_tree *tree,
	136	struct page *page, unsigned long offset);
	137	int extent_write_full_page(struct extent_map_tree tree, struct page page,
	138	get_extent_t *get_extent,
	139	struct writeback_control *wbc);
	140	int extent_prepare_write(struct extent_map_tree *tree,
	141	struct inode inode, struct page page,
	142	unsigned from, unsigned to, get_extent_t *get_extent);
	143	int extent_commit_write(struct extent_map_tree *tree,
	144	struct inode inode, struct page page,
	145	unsigned from, unsigned to);
d396c6f5 CH	146	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
d396c6f5 CH	147	get_extent_t *get_extent);
a52d9a80	148	int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
07157aac CM	149	int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
07157aac CM	150	int get_state_private(struct extent_map_tree tree, u64 start, u64 private);
b3cfa35a	151	void set_page_extent_mapped(struct page *page);
5f39d397 CM	152
	153	struct extent_buffer alloc_extent_buffer(struct extent_map_tree tree,
	154	u64 start, unsigned long len,
19c00ddc	155	struct page *page0,
5f39d397 CM	156	gfp_t mask);
	157	struct extent_buffer find_extent_buffer(struct extent_map_tree tree,
	158	u64 start, unsigned long len,
	159	gfp_t mask);
	160	void free_extent_buffer(struct extent_buffer *eb);
	161	int read_extent_buffer_pages(struct extent_map_tree *tree,
19c00ddc	162	struct extent_buffer *eb, u64 start, int wait);
5f39d397 CM	163
	164	static inline void extent_buffer_get(struct extent_buffer *eb)
	165	{
	166	atomic_inc(&eb->refs);
	167	}
	168
5f39d397 CM	169	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	170	unsigned long start,
	171	unsigned long len);
	172	void read_extent_buffer(struct extent_buffer eb, void dst,
	173	unsigned long start,
	174	unsigned long len);
	175	void write_extent_buffer(struct extent_buffer eb, const void src,
	176	unsigned long start, unsigned long len);
	177	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	178	unsigned long dst_offset, unsigned long src_offset,
	179	unsigned long len);
	180	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	181	unsigned long src_offset, unsigned long len);
	182	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	183	unsigned long src_offset, unsigned long len);
	184	void memset_extent_buffer(struct extent_buffer *eb, char c,
	185	unsigned long start, unsigned long len);
	186	int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
	187	struct extent_buffer *eb);
	188	int clear_extent_buffer_dirty(struct extent_map_tree *tree,
	189	struct extent_buffer *eb);
	190	int set_extent_buffer_dirty(struct extent_map_tree *tree,
	191	struct extent_buffer *eb);
	192	int set_extent_buffer_uptodate(struct extent_map_tree *tree,
	193	struct extent_buffer *eb);
	194	int extent_buffer_uptodate(struct extent_map_tree *tree,
	195	struct extent_buffer *eb);
	196	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
479965d6	197	unsigned long min_len, char token, char map,
5f39d397 CM	198	unsigned long *map_start,
5f39d397 CM	199	unsigned long *map_len, int km);
19c00ddc CM	200	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	201	unsigned long min_len, char token, char map,
	202	unsigned long *map_start,
	203	unsigned long *map_len, int km);
5f39d397	204	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
a52d9a80	205	#endif