[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_ORDERED (1 << 9)
#define EXTENT_ORDERED_METADATA (1 << 10)
#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 uptodate);
	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 clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		     int bits, int wake, int delete, 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 clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
		       gfp_t mask);
int clear_extent_ordered_metadata(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 set_extent_ordered(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 wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
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)
e6dcd2dc CM	16	#define EXTENT_ORDERED (1 << 9)
e6dcd2dc CM	17	#define EXTENT_ORDERED_METADATA (1 << 10)
d1310b2e CM	18	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	19
	20	/*
	21	* page->private values. Every page that is controlled by the extent
	22	* map has page->private set to one.
	23	*/
	24	#define EXTENT_PAGE_PRIVATE 1
	25	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	26
70dec807 CM	27	struct extent_state;
70dec807 CM	28
44b8bd7e CM	29	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
44b8bd7e CM	30	struct bio *bio, int mirror_num);
d1310b2e CM	31	struct extent_io_ops {
	32	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	33	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	34	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3 CM	35	int (merge_bio_hook)(struct page page, unsigned long offset,
239b14b3 CM	36	size_t size, struct bio *bio);
d1310b2e	37	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	38	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	39	u64 start, u64 end,
	40	struct extent_state *state);
1259ab75 CM	41	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	42	u64 start, u64 end,
	43	struct extent_state *state);
70dec807 CM	44	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	45	struct extent_state *state);
1259ab75	46	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	47	struct extent_state *state, int uptodate);
291d673e	48	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	49	unsigned long old, unsigned long bits);
291d673e	50	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	51	unsigned long old, unsigned long bits);
d1310b2e CM	52	};
	53
	54	struct extent_io_tree {
	55	struct rb_root state;
	56	struct address_space *mapping;
	57	u64 dirty_bytes;
70dec807	58	spinlock_t lock;
d1310b2e CM	59	struct extent_io_ops *ops;
	60	spinlock_t lru_lock;
	61	struct list_head buffer_lru;
	62	int lru_size;
80ea96b1	63	struct extent_state *last;
d1310b2e CM	64	};
	65
	66	struct extent_state {
	67	u64 start;
	68	u64 end; /* inclusive */
d1310b2e	69	struct rb_node rb_node;
70dec807	70	struct extent_io_tree *tree;
d1310b2e CM	71	wait_queue_head_t wq;
	72	atomic_t refs;
	73	unsigned long state;
	74
	75	/* for use by the FS */
	76	u64 private;
	77
2d2ae547	78	struct list_head leak_list;
d1310b2e CM	79	};
	80
	81	struct extent_buffer {
	82	u64 start;
	83	unsigned long len;
	84	char *map_token;
	85	char *kaddr;
	86	unsigned long map_start;
	87	unsigned long map_len;
	88	struct page *first_page;
	89	struct list_head lru;
	90	atomic_t refs;
	91	int flags;
2d2ae547	92	struct list_head leak_list;
d1310b2e CM	93	};
	94
	95	struct extent_map_tree;
	96
d7fc640e CM	97	static inline struct extent_state extent_state_next(struct extent_state state)
	98	{
	99	struct rb_node *node;
	100	node = rb_next(&state->rb_node);
	101	if (!node)
	102	return NULL;
	103	return rb_entry(node, struct extent_state, rb_node);
	104	}
	105
d1310b2e CM	106	typedef struct extent_map (get_extent_t)(struct inode inode,
	107	struct page *page,
	108	size_t page_offset,
	109	u64 start, u64 len,
	110	int create);
	111
	112	void extent_io_tree_init(struct extent_io_tree *tree,
	113	struct address_space *mapping, gfp_t mask);
	114	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	115	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	116	struct extent_io_tree tree, struct page page,
70dec807 CM	117	gfp_t mask);
7b13b7b1 CM	118	int try_release_extent_state(struct extent_map_tree *map,
	119	struct extent_io_tree tree, struct page page,
	120	gfp_t mask);
d1310b2e CM	121	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	122	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	123	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	124	get_extent_t *get_extent);
	125	int __init extent_io_init(void);
	126	void extent_io_exit(void);
	127
	128	u64 count_range_bits(struct extent_io_tree *tree,
	129	u64 *start, u64 search_end,
	130	u64 max_bytes, unsigned long bits);
	131
	132	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	133	int bits, int filled);
	134	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	135	int bits, gfp_t mask);
e6dcd2dc CM	136	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	137	int bits, int wake, int delete, gfp_t mask);
d1310b2e CM	138	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	139	int bits, gfp_t mask);
	140	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	141	gfp_t mask);
	142	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	143	gfp_t mask);
	144	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	145	gfp_t mask);
	146	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	147	gfp_t mask);
e6dcd2dc CM	148	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	149	gfp_t mask);
	150	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	151	u64 end, gfp_t mask);
d1310b2e CM	152	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	153	gfp_t mask);
e6dcd2dc CM	154	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	155	gfp_t mask);
d1310b2e CM	156	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	157	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	158	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	159	u64 start, int bits);
d1310b2e CM	160	int extent_invalidatepage(struct extent_io_tree *tree,
	161	struct page *page, unsigned long offset);
	162	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	163	get_extent_t *get_extent,
	164	struct writeback_control *wbc);
	165	int extent_writepages(struct extent_io_tree *tree,
	166	struct address_space *mapping,
	167	get_extent_t *get_extent,
	168	struct writeback_control *wbc);
	169	int extent_readpages(struct extent_io_tree *tree,
	170	struct address_space *mapping,
	171	struct list_head *pages, unsigned nr_pages,
	172	get_extent_t get_extent);
	173	int extent_prepare_write(struct extent_io_tree *tree,
	174	struct inode inode, struct page page,
	175	unsigned from, unsigned to, get_extent_t *get_extent);
	176	int extent_commit_write(struct extent_io_tree *tree,
	177	struct inode inode, struct page page,
	178	unsigned from, unsigned to);
	179	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	180	get_extent_t *get_extent);
	181	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	182	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	183	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	184	void set_page_extent_mapped(struct page *page);
	185
	186	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	187	u64 start, unsigned long len,
	188	struct page *page0,
	189	gfp_t mask);
	190	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	191	u64 start, unsigned long len,
	192	gfp_t mask);
	193	void free_extent_buffer(struct extent_buffer *eb);
	194	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	195	struct extent_buffer *eb, u64 start, int wait,
f188591e	196	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	197
	198	static inline void extent_buffer_get(struct extent_buffer *eb)
	199	{
	200	atomic_inc(&eb->refs);
	201	}
	202
	203	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	204	unsigned long start,
	205	unsigned long len);
	206	void read_extent_buffer(struct extent_buffer eb, void dst,
	207	unsigned long start,
	208	unsigned long len);
	209	void write_extent_buffer(struct extent_buffer eb, const void src,
	210	unsigned long start, unsigned long len);
	211	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	212	unsigned long dst_offset, unsigned long src_offset,
	213	unsigned long len);
	214	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	215	unsigned long src_offset, unsigned long len);
	216	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	217	unsigned long src_offset, unsigned long len);
	218	void memset_extent_buffer(struct extent_buffer *eb, char c,
	219	unsigned long start, unsigned long len);
	220	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	221	struct extent_buffer *eb);
e6dcd2dc CM	222	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	223	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	224	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	225	struct extent_buffer *eb);
	226	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	227	struct extent_buffer *eb);
	228	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	229	struct extent_buffer *eb);
1259ab75 CM	230	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	231	struct extent_buffer *eb);
d1310b2e CM	232	int extent_buffer_uptodate(struct extent_io_tree *tree,
	233	struct extent_buffer *eb);
	234	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	235	unsigned long min_len, char token, char map,
	236	unsigned long *map_start,
	237	unsigned long *map_len, int km);
	238	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	239	unsigned long min_len, char token, char map,
	240	unsigned long *map_start,
	241	unsigned long *map_len, int km);
	242	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
728131d8 CM	243	int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
728131d8 CM	244	unsigned long len);
ce9adaa5 CM	245	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	246	int extent_range_uptodate(struct extent_io_tree *tree,
	247	u64 start, u64 end);
d1310b2e	248	#endif