[deliverable/linux.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_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;
};

/* 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;
	atomic_t refs;
	int flags;
	struct list_head list;
	struct list_head leak_list;
	struct page *first_page;
	struct page *last_page;
	unsigned long alloc_addr;
	char *map_token;
	char *kaddr;
	unsigned long map_start;
	unsigned long map_len;
};

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);
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)
	17	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	18
	19
07157aac CM	20	struct extent_map_ops {
	21	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	22	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	23	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	24	int (readpage_end_io_hook)(struct page page, u64 start, u64 end);
0e2752a7	25	void (writepage_end_io_hook)(struct page page, u64 start, u64 end);
07157aac CM	26	};
07157aac CM	27
a52d9a80 CM	28	struct extent_map_tree {
	29	struct rb_root map;
	30	struct rb_root state;
	31	struct address_space *mapping;
	32	rwlock_t lock;
07157aac	33	struct extent_map_ops *ops;
a52d9a80 CM	34	};
	35
	36	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	37	struct extent_map {
	38	u64 start;
	39	u64 end; /* inclusive */
	40	int in_tree;
	41	struct rb_node rb_node;
	42	/* block_start and block_end are in bytes */
	43	u64 block_start;
	44	u64 block_end; /* inclusive */
	45	struct block_device *bdev;
	46	atomic_t refs;
	47	};
	48
	49	/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
	50	struct extent_state {
	51	u64 start;
	52	u64 end; /* inclusive */
	53	int in_tree;
	54	struct rb_node rb_node;
	55	wait_queue_head_t wq;
	56	atomic_t refs;
	57	unsigned long state;
07157aac CM	58
	59	/* for use by the FS */
	60	u64 private;
	61
a52d9a80 CM	62	struct list_head list;
	63	};
	64
	65	struct extent_buffer {
	66	u64 start;
5f39d397 CM	67	unsigned long len;
	68	atomic_t refs;
	69	int flags;
6d36dcd4	70	struct list_head list;
f510cfec	71	struct list_head leak_list;
6d36dcd4	72	struct page *first_page;
db94535d	73	struct page *last_page;
f510cfec	74	unsigned long alloc_addr;
db94535d CM	75	char *map_token;
	76	char *kaddr;
	77	unsigned long map_start;
	78	unsigned long map_len;
a52d9a80 CM	79	};
	80
	81	typedef struct extent_map (get_extent_t)(struct inode inode,
	82	struct page *page,
	83	size_t page_offset,
	84	u64 start, u64 end,
	85	int create);
	86
	87	void extent_map_tree_init(struct extent_map_tree *tree,
	88	struct address_space *mapping, gfp_t mask);
	89	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
	90	u64 start, u64 end);
	91	int add_extent_mapping(struct extent_map_tree *tree,
	92	struct extent_map *em);
	93	int remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
	94	int try_release_extent_mapping(struct extent_map_tree tree, struct page page);
	95	int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	96	int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
	97	struct extent_map *alloc_extent_map(gfp_t mask);
	98	void free_extent_map(struct extent_map *em);
	99	int extent_read_full_page(struct extent_map_tree tree, struct page page,
	100	get_extent_t *get_extent);
	101	void __init extent_map_init(void);
	102	void __exit extent_map_exit(void);
1a5bc167 CM	103
	104	int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
	105	int bits, int filled);
96b5179d CM	106	int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	107	int bits, gfp_t mask);
	108	int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	109	int bits, gfp_t mask);
a52d9a80 CM	110	int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
	111	gfp_t mask);
	112	int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
	113	gfp_t mask);
	114	int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
	115	gfp_t mask);
5f39d397 CM	116	int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
5f39d397 CM	117	gfp_t mask);
b888db2b CM	118	int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
b888db2b CM	119	gfp_t mask);
5f39d397 CM	120	int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
5f39d397 CM	121	u64 start_ret, u64 end_ret, int bits);
a52d9a80 CM	122	int extent_invalidatepage(struct extent_map_tree *tree,
	123	struct page *page, unsigned long offset);
	124	int extent_write_full_page(struct extent_map_tree tree, struct page page,
	125	get_extent_t *get_extent,
	126	struct writeback_control *wbc);
	127	int extent_prepare_write(struct extent_map_tree *tree,
	128	struct inode inode, struct page page,
	129	unsigned from, unsigned to, get_extent_t *get_extent);
	130	int extent_commit_write(struct extent_map_tree *tree,
	131	struct inode inode, struct page page,
	132	unsigned from, unsigned to);
d396c6f5 CH	133	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
d396c6f5 CH	134	get_extent_t *get_extent);
a52d9a80	135	int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
07157aac CM	136	int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
07157aac CM	137	int get_state_private(struct extent_map_tree tree, u64 start, u64 private);
b3cfa35a	138	void set_page_extent_mapped(struct page *page);
5f39d397 CM	139
	140	struct extent_buffer alloc_extent_buffer(struct extent_map_tree tree,
	141	u64 start, unsigned long len,
	142	gfp_t mask);
	143	struct extent_buffer find_extent_buffer(struct extent_map_tree tree,
	144	u64 start, unsigned long len,
	145	gfp_t mask);
	146	void free_extent_buffer(struct extent_buffer *eb);
	147	int read_extent_buffer_pages(struct extent_map_tree *tree,
	148	struct extent_buffer *eb, int wait);
	149
	150	static inline void extent_buffer_get(struct extent_buffer *eb)
	151	{
	152	atomic_inc(&eb->refs);
	153	}
	154
5f39d397 CM	155	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	156	unsigned long start,
	157	unsigned long len);
	158	void read_extent_buffer(struct extent_buffer eb, void dst,
	159	unsigned long start,
	160	unsigned long len);
	161	void write_extent_buffer(struct extent_buffer eb, const void src,
	162	unsigned long start, unsigned long len);
	163	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	164	unsigned long dst_offset, unsigned long src_offset,
	165	unsigned long len);
	166	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	167	unsigned long src_offset, unsigned long len);
	168	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	169	unsigned long src_offset, unsigned long len);
	170	void memset_extent_buffer(struct extent_buffer *eb, char c,
	171	unsigned long start, unsigned long len);
	172	int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
	173	struct extent_buffer *eb);
	174	int clear_extent_buffer_dirty(struct extent_map_tree *tree,
	175	struct extent_buffer *eb);
	176	int set_extent_buffer_dirty(struct extent_map_tree *tree,
	177	struct extent_buffer *eb);
	178	int set_extent_buffer_uptodate(struct extent_map_tree *tree,
	179	struct extent_buffer *eb);
	180	int extent_buffer_uptodate(struct extent_map_tree *tree,
	181	struct extent_buffer *eb);
	182	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
479965d6	183	unsigned long min_len, char token, char map,
5f39d397 CM	184	unsigned long *map_start,
	185	unsigned long *map_len, int km);
	186	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
a52d9a80	187	#endif