[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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)


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