[linux-2.6-block.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 (*writepage_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);
	int (*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 clear_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);
1259ab75 CM	39	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	40	u64 start, u64 end,
	41	struct extent_state *state);
70dec807 CM	42	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	43	struct extent_state *state);
1259ab75	44	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807	45	struct extent_state *state);
291d673e	46	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	47	unsigned long old, unsigned long bits);
291d673e	48	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	49	unsigned long old, unsigned long bits);
d1310b2e CM	50	};
	51
	52	struct extent_io_tree {
	53	struct rb_root state;
	54	struct address_space *mapping;
	55	u64 dirty_bytes;
70dec807	56	spinlock_t lock;
d1310b2e CM	57	struct extent_io_ops *ops;
	58	spinlock_t lru_lock;
	59	struct list_head buffer_lru;
	60	int lru_size;
80ea96b1	61	struct extent_state *last;
d1310b2e CM	62	};
	63
	64	struct extent_state {
	65	u64 start;
	66	u64 end; /* inclusive */
d1310b2e	67	struct rb_node rb_node;
70dec807	68	struct extent_io_tree *tree;
d1310b2e CM	69	wait_queue_head_t wq;
	70	atomic_t refs;
	71	unsigned long state;
	72
	73	/* for use by the FS */
	74	u64 private;
	75
2d2ae547	76	struct list_head leak_list;
d1310b2e CM	77	};
	78
	79	struct extent_buffer {
	80	u64 start;
	81	unsigned long len;
	82	char *map_token;
	83	char *kaddr;
	84	unsigned long map_start;
	85	unsigned long map_len;
	86	struct page *first_page;
	87	struct list_head lru;
	88	atomic_t refs;
	89	int flags;
2d2ae547	90	struct list_head leak_list;
d1310b2e CM	91	};
	92
	93	struct extent_map_tree;
	94
d7fc640e CM	95	static inline struct extent_state extent_state_next(struct extent_state state)
	96	{
	97	struct rb_node *node;
	98	node = rb_next(&state->rb_node);
	99	if (!node)
	100	return NULL;
	101	return rb_entry(node, struct extent_state, rb_node);
	102	}
	103
d1310b2e CM	104	typedef struct extent_map (get_extent_t)(struct inode inode,
	105	struct page *page,
	106	size_t page_offset,
	107	u64 start, u64 len,
	108	int create);
	109
	110	void extent_io_tree_init(struct extent_io_tree *tree,
	111	struct address_space *mapping, gfp_t mask);
	112	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	113	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	114	struct extent_io_tree tree, struct page page,
70dec807 CM	115	gfp_t mask);
7b13b7b1 CM	116	int try_release_extent_state(struct extent_map_tree *map,
	117	struct extent_io_tree tree, struct page page,
	118	gfp_t mask);
d1310b2e CM	119	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	120	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	121	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	122	get_extent_t *get_extent);
	123	int __init extent_io_init(void);
	124	void extent_io_exit(void);
	125
	126	u64 count_range_bits(struct extent_io_tree *tree,
	127	u64 *start, u64 search_end,
	128	u64 max_bytes, unsigned long bits);
	129
	130	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	131	int bits, int filled);
	132	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	133	int bits, gfp_t mask);
	134	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	135	int bits, gfp_t mask);
	136	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	137	gfp_t mask);
	138	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	139	gfp_t mask);
	140	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	141	gfp_t mask);
	142	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	143	gfp_t mask);
	144	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
	145	gfp_t mask);
	146	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
	147	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	148	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	149	u64 start, int bits);
d1310b2e CM	150	int extent_invalidatepage(struct extent_io_tree *tree,
	151	struct page *page, unsigned long offset);
	152	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	153	get_extent_t *get_extent,
	154	struct writeback_control *wbc);
	155	int extent_writepages(struct extent_io_tree *tree,
	156	struct address_space *mapping,
	157	get_extent_t *get_extent,
	158	struct writeback_control *wbc);
	159	int extent_readpages(struct extent_io_tree *tree,
	160	struct address_space *mapping,
	161	struct list_head *pages, unsigned nr_pages,
	162	get_extent_t get_extent);
	163	int extent_prepare_write(struct extent_io_tree *tree,
	164	struct inode inode, struct page page,
	165	unsigned from, unsigned to, get_extent_t *get_extent);
	166	int extent_commit_write(struct extent_io_tree *tree,
	167	struct inode inode, struct page page,
	168	unsigned from, unsigned to);
	169	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	170	get_extent_t *get_extent);
	171	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	172	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	173	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	174	void set_page_extent_mapped(struct page *page);
	175
	176	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	177	u64 start, unsigned long len,
	178	struct page *page0,
	179	gfp_t mask);
	180	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	181	u64 start, unsigned long len,
	182	gfp_t mask);
	183	void free_extent_buffer(struct extent_buffer *eb);
	184	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	185	struct extent_buffer *eb, u64 start, int wait,
f188591e	186	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	187
	188	static inline void extent_buffer_get(struct extent_buffer *eb)
	189	{
	190	atomic_inc(&eb->refs);
	191	}
	192
	193	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	194	unsigned long start,
	195	unsigned long len);
	196	void read_extent_buffer(struct extent_buffer eb, void dst,
	197	unsigned long start,
	198	unsigned long len);
	199	void write_extent_buffer(struct extent_buffer eb, const void src,
	200	unsigned long start, unsigned long len);
	201	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	202	unsigned long dst_offset, unsigned long src_offset,
	203	unsigned long len);
	204	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	205	unsigned long src_offset, unsigned long len);
	206	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	207	unsigned long src_offset, unsigned long len);
	208	void memset_extent_buffer(struct extent_buffer *eb, char c,
	209	unsigned long start, unsigned long len);
	210	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	211	struct extent_buffer *eb);
	212	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	213	struct extent_buffer *eb);
	214	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	215	struct extent_buffer *eb);
	216	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	217	struct extent_buffer *eb);
1259ab75 CM	218	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	219	struct extent_buffer *eb);
d1310b2e CM	220	int extent_buffer_uptodate(struct extent_io_tree *tree,
	221	struct extent_buffer *eb);
	222	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	223	unsigned long min_len, char token, char map,
	224	unsigned long *map_start,
	225	unsigned long *map_len, int km);
	226	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	227	unsigned long min_len, char token, char map,
	228	unsigned long *map_start,
	229	unsigned long *map_len, int km);
	230	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
728131d8 CM	231	int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
728131d8 CM	232	unsigned long len);
ce9adaa5 CM	233	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	234	int extent_range_uptodate(struct extent_io_tree *tree,
	235	u64 start, u64 end);
d1310b2e	236	#endif