[deliverable/linux.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_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;

typedef	int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
				       struct bio *bio, int mirror_num);
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);
	extent_submit_bio_hook_t *submit_bio_hook;
	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_io_failed_hook)(struct bio *bio, struct page *page,
				       u64 start, u64 end,
				       struct extent_state *state);
	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 leak_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 list_head leak_list;
};

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 try_release_extent_state(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, int mirror_num);

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);
int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
			  unsigned long len);
int release_extent_buffer_tail_pages(struct extent_buffer *eb);
int extent_range_uptodate(struct extent_io_tree *tree,
			  u64 start, u64 end);
#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)
d1310b2e CM	16	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	17
	18	/*
	19	* page->private values. Every page that is controlled by the extent
	20	* map has page->private set to one.
	21	*/
	22	#define EXTENT_PAGE_PRIVATE 1
	23	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	24
70dec807 CM	25	struct extent_state;
70dec807 CM	26
44b8bd7e CM	27	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
44b8bd7e CM	28	struct bio *bio, int mirror_num);
d1310b2e CM	29	struct extent_io_ops {
	30	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	31	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	32	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3 CM	33	int (merge_bio_hook)(struct page page, unsigned long offset,
239b14b3 CM	34	size_t size, struct bio *bio);
d1310b2e	35	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	36	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	37	u64 start, u64 end,
	38	struct extent_state *state);
70dec807 CM	39	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
	40	struct extent_state *state);
	41	void (writepage_end_io_hook)(struct page page, u64 start, u64 end,
	42	struct extent_state *state);
291d673e	43	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	44	unsigned long old, unsigned long bits);
291d673e	45	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	46	unsigned long old, unsigned long bits);
d1310b2e CM	47	};
	48
	49	struct extent_io_tree {
	50	struct rb_root state;
	51	struct address_space *mapping;
	52	u64 dirty_bytes;
70dec807	53	spinlock_t lock;
d1310b2e CM	54	struct extent_io_ops *ops;
	55	spinlock_t lru_lock;
	56	struct list_head buffer_lru;
	57	int lru_size;
80ea96b1	58	struct extent_state *last;
d1310b2e CM	59	};
	60
	61	struct extent_state {
	62	u64 start;
	63	u64 end; /* inclusive */
d1310b2e	64	struct rb_node rb_node;
70dec807	65	struct extent_io_tree *tree;
d1310b2e CM	66	wait_queue_head_t wq;
	67	atomic_t refs;
	68	unsigned long state;
	69
	70	/* for use by the FS */
	71	u64 private;
	72
2d2ae547	73	struct list_head leak_list;
d1310b2e CM	74	};
	75
	76	struct extent_buffer {
	77	u64 start;
	78	unsigned long len;
	79	char *map_token;
	80	char *kaddr;
	81	unsigned long map_start;
	82	unsigned long map_len;
	83	struct page *first_page;
	84	struct list_head lru;
	85	atomic_t refs;
	86	int flags;
2d2ae547	87	struct list_head leak_list;
d1310b2e CM	88	};
	89
	90	struct extent_map_tree;
	91
d7fc640e CM	92	static inline struct extent_state extent_state_next(struct extent_state state)
	93	{
	94	struct rb_node *node;
	95	node = rb_next(&state->rb_node);
	96	if (!node)
	97	return NULL;
	98	return rb_entry(node, struct extent_state, rb_node);
	99	}
	100
d1310b2e CM	101	typedef struct extent_map (get_extent_t)(struct inode inode,
	102	struct page *page,
	103	size_t page_offset,
	104	u64 start, u64 len,
	105	int create);
	106
	107	void extent_io_tree_init(struct extent_io_tree *tree,
	108	struct address_space *mapping, gfp_t mask);
	109	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	110	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	111	struct extent_io_tree tree, struct page page,
70dec807 CM	112	gfp_t mask);
7b13b7b1 CM	113	int try_release_extent_state(struct extent_map_tree *map,
	114	struct extent_io_tree tree, struct page page,
	115	gfp_t mask);
d1310b2e CM	116	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	117	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	118	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	119	get_extent_t *get_extent);
	120	int __init extent_io_init(void);
	121	void extent_io_exit(void);
	122
	123	u64 count_range_bits(struct extent_io_tree *tree,
	124	u64 *start, u64 search_end,
	125	u64 max_bytes, unsigned long bits);
	126
	127	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	128	int bits, int filled);
	129	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	130	int bits, gfp_t mask);
	131	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	132	int bits, gfp_t mask);
	133	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	134	gfp_t mask);
	135	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	136	gfp_t mask);
	137	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	138	gfp_t mask);
	139	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	140	gfp_t mask);
	141	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
	142	gfp_t mask);
	143	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
	144	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	145	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	146	u64 start, int bits);
d1310b2e CM	147	int extent_invalidatepage(struct extent_io_tree *tree,
	148	struct page *page, unsigned long offset);
	149	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	150	get_extent_t *get_extent,
	151	struct writeback_control *wbc);
	152	int extent_writepages(struct extent_io_tree *tree,
	153	struct address_space *mapping,
	154	get_extent_t *get_extent,
	155	struct writeback_control *wbc);
	156	int extent_readpages(struct extent_io_tree *tree,
	157	struct address_space *mapping,
	158	struct list_head *pages, unsigned nr_pages,
	159	get_extent_t get_extent);
	160	int extent_prepare_write(struct extent_io_tree *tree,
	161	struct inode inode, struct page page,
	162	unsigned from, unsigned to, get_extent_t *get_extent);
	163	int extent_commit_write(struct extent_io_tree *tree,
	164	struct inode inode, struct page page,
	165	unsigned from, unsigned to);
	166	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	167	get_extent_t *get_extent);
	168	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	169	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	170	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	171	void set_page_extent_mapped(struct page *page);
	172
	173	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	174	u64 start, unsigned long len,
	175	struct page *page0,
	176	gfp_t mask);
	177	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	178	u64 start, unsigned long len,
	179	gfp_t mask);
	180	void free_extent_buffer(struct extent_buffer *eb);
	181	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	182	struct extent_buffer *eb, u64 start, int wait,
f188591e	183	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	184
	185	static inline void extent_buffer_get(struct extent_buffer *eb)
	186	{
	187	atomic_inc(&eb->refs);
	188	}
	189
	190	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	191	unsigned long start,
	192	unsigned long len);
	193	void read_extent_buffer(struct extent_buffer eb, void dst,
	194	unsigned long start,
	195	unsigned long len);
	196	void write_extent_buffer(struct extent_buffer eb, const void src,
	197	unsigned long start, unsigned long len);
	198	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	199	unsigned long dst_offset, unsigned long src_offset,
	200	unsigned long len);
	201	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	202	unsigned long src_offset, unsigned long len);
	203	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	204	unsigned long src_offset, unsigned long len);
	205	void memset_extent_buffer(struct extent_buffer *eb, char c,
	206	unsigned long start, unsigned long len);
	207	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	208	struct extent_buffer *eb);
	209	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	210	struct extent_buffer *eb);
	211	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	212	struct extent_buffer *eb);
	213	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	214	struct extent_buffer *eb);
	215	int extent_buffer_uptodate(struct extent_io_tree *tree,
	216	struct extent_buffer *eb);
	217	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	218	unsigned long min_len, char token, char map,
	219	unsigned long *map_start,
	220	unsigned long *map_len, int km);
	221	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	222	unsigned long min_len, char token, char map,
	223	unsigned long *map_start,
	224	unsigned long *map_len, int km);
	225	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
728131d8 CM	226	int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
728131d8 CM	227	unsigned long len);
ce9adaa5 CM	228	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	229	int extent_range_uptodate(struct extent_io_tree *tree,
	230	u64 start, u64 end);
d1310b2e	231	#endif