[mirror_ubuntu-artful-kernel.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;
	u64 dirty_bytes;
	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);
int __init extent_map_init(void);
void extent_map_exit(void);

u64 count_range_bits(struct extent_map_tree *tree,
		     u64 *start, u64 search_end,
		     u64 max_bytes, unsigned long bits);

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_writepages(struct extent_map_tree *tree,
		      struct address_space *mapping,
		      get_extent_t *get_extent,
		      struct writeback_control *wbc);
int extent_readpages(struct extent_map_tree *tree,
		     struct address_space *mapping,
		     struct list_head *pages, unsigned nr_pages,
		     get_extent_t get_extent);
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	*/
19c00ddc CM	27	#define EXTENT_PAGE_PRIVATE 1
	28	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	29
5f39d397	30
07157aac CM	31	struct extent_map_ops {
	32	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	33	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	34	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	35	int (readpage_end_io_hook)(struct page page, u64 start, u64 end);
0e2752a7	36	void (writepage_end_io_hook)(struct page page, u64 start, u64 end);
07157aac CM	37	};
07157aac CM	38
a52d9a80 CM	39	struct extent_map_tree {
	40	struct rb_root map;
	41	struct rb_root state;
	42	struct address_space *mapping;
ca664626	43	u64 dirty_bytes;
a52d9a80	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);
2f4cbe64	114	int __init extent_map_init(void);
17636e03	115	void extent_map_exit(void);
1a5bc167	116
793955bc	117	u64 count_range_bits(struct extent_map_tree *tree,
1832a6d5 CM	118	u64 *start, u64 search_end,
1832a6d5 CM	119	u64 max_bytes, unsigned long bits);
793955bc	120
1a5bc167 CM	121	int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
1a5bc167 CM	122	int bits, int filled);
96b5179d CM	123	int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	124	int bits, gfp_t mask);
	125	int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
	126	int bits, gfp_t mask);
a52d9a80 CM	127	int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
	128	gfp_t mask);
	129	int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
	130	gfp_t mask);
	131	int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
	132	gfp_t mask);
5f39d397 CM	133	int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
5f39d397 CM	134	gfp_t mask);
b888db2b CM	135	int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
b888db2b CM	136	gfp_t mask);
5f39d397 CM	137	int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
5f39d397 CM	138	u64 start_ret, u64 end_ret, int bits);
a52d9a80 CM	139	int extent_invalidatepage(struct extent_map_tree *tree,
	140	struct page *page, unsigned long offset);
	141	int extent_write_full_page(struct extent_map_tree tree, struct page page,
	142	get_extent_t *get_extent,
	143	struct writeback_control *wbc);
b293f02e CM	144	int extent_writepages(struct extent_map_tree *tree,
	145	struct address_space *mapping,
	146	get_extent_t *get_extent,
	147	struct writeback_control *wbc);
3ab2fb5a CM	148	int extent_readpages(struct extent_map_tree *tree,
	149	struct address_space *mapping,
	150	struct list_head *pages, unsigned nr_pages,
	151	get_extent_t get_extent);
a52d9a80 CM	152	int extent_prepare_write(struct extent_map_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_map_tree *tree,
	156	struct inode inode, struct page page,
	157	unsigned from, unsigned to);
d396c6f5 CH	158	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
d396c6f5 CH	159	get_extent_t *get_extent);
a52d9a80	160	int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
07157aac CM	161	int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
07157aac CM	162	int get_state_private(struct extent_map_tree tree, u64 start, u64 private);
b3cfa35a	163	void set_page_extent_mapped(struct page *page);
5f39d397 CM	164
	165	struct extent_buffer alloc_extent_buffer(struct extent_map_tree tree,
	166	u64 start, unsigned long len,
19c00ddc	167	struct page *page0,
5f39d397 CM	168	gfp_t mask);
	169	struct extent_buffer find_extent_buffer(struct extent_map_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_map_tree *tree,
19c00ddc	174	struct extent_buffer *eb, u64 start, int wait);
5f39d397 CM	175
	176	static inline void extent_buffer_get(struct extent_buffer *eb)
	177	{
	178	atomic_inc(&eb->refs);
	179	}
	180
5f39d397 CM	181	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	182	unsigned long start,
	183	unsigned long len);
	184	void read_extent_buffer(struct extent_buffer eb, void dst,
	185	unsigned long start,
	186	unsigned long len);
	187	void write_extent_buffer(struct extent_buffer eb, const void src,
	188	unsigned long start, unsigned long len);
	189	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	190	unsigned long dst_offset, unsigned long src_offset,
	191	unsigned long len);
	192	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	193	unsigned long src_offset, unsigned long len);
	194	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	195	unsigned long src_offset, unsigned long len);
	196	void memset_extent_buffer(struct extent_buffer *eb, char c,
	197	unsigned long start, unsigned long len);
	198	int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
	199	struct extent_buffer *eb);
	200	int clear_extent_buffer_dirty(struct extent_map_tree *tree,
	201	struct extent_buffer *eb);
	202	int set_extent_buffer_dirty(struct extent_map_tree *tree,
	203	struct extent_buffer *eb);
	204	int set_extent_buffer_uptodate(struct extent_map_tree *tree,
	205	struct extent_buffer *eb);
	206	int extent_buffer_uptodate(struct extent_map_tree *tree,
	207	struct extent_buffer *eb);
	208	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
479965d6	209	unsigned long min_len, char token, char map,
5f39d397 CM	210	unsigned long *map_start,
5f39d397 CM	211	unsigned long *map_len, int km);
19c00ddc CM	212	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	213	unsigned long min_len, char token, char map,
	214	unsigned long *map_start,
	215	unsigned long *map_len, int km);
5f39d397	216	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
a52d9a80	217	#endif