[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_start_hook)(struct page *page, 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 {
d1310b2e CM	32	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
247e743c	33	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	34	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	35	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3 CM	36	int (merge_bio_hook)(struct page page, unsigned long offset,
239b14b3 CM	37	size_t size, struct bio *bio);
d1310b2e	38	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	39	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	40	u64 start, u64 end,
	41	struct extent_state *state);
1259ab75 CM	42	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	43	u64 start, u64 end,
	44	struct extent_state *state);
70dec807 CM	45	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	46	struct extent_state *state);
1259ab75	47	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	48	struct extent_state *state, int uptodate);
291d673e	49	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	50	unsigned long old, unsigned long bits);
291d673e	51	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	52	unsigned long old, unsigned long bits);
d1310b2e CM	53	};
	54
	55	struct extent_io_tree {
	56	struct rb_root state;
	57	struct address_space *mapping;
	58	u64 dirty_bytes;
70dec807	59	spinlock_t lock;
d1310b2e CM	60	struct extent_io_ops *ops;
	61	spinlock_t lru_lock;
	62	struct list_head buffer_lru;
	63	int lru_size;
80ea96b1	64	struct extent_state *last;
d1310b2e CM	65	};
	66
	67	struct extent_state {
	68	u64 start;
	69	u64 end; /* inclusive */
d1310b2e	70	struct rb_node rb_node;
70dec807	71	struct extent_io_tree *tree;
d1310b2e CM	72	wait_queue_head_t wq;
	73	atomic_t refs;
	74	unsigned long state;
	75
	76	/* for use by the FS */
	77	u64 private;
	78
2d2ae547	79	struct list_head leak_list;
d1310b2e CM	80	};
	81
	82	struct extent_buffer {
	83	u64 start;
	84	unsigned long len;
	85	char *map_token;
	86	char *kaddr;
	87	unsigned long map_start;
	88	unsigned long map_len;
	89	struct page *first_page;
	90	struct list_head lru;
	91	atomic_t refs;
	92	int flags;
2d2ae547	93	struct list_head leak_list;
d1310b2e CM	94	};
	95
	96	struct extent_map_tree;
	97
d7fc640e CM	98	static inline struct extent_state extent_state_next(struct extent_state state)
	99	{
	100	struct rb_node *node;
	101	node = rb_next(&state->rb_node);
	102	if (!node)
	103	return NULL;
	104	return rb_entry(node, struct extent_state, rb_node);
	105	}
	106
d1310b2e CM	107	typedef struct extent_map (get_extent_t)(struct inode inode,
	108	struct page *page,
	109	size_t page_offset,
	110	u64 start, u64 len,
	111	int create);
	112
	113	void extent_io_tree_init(struct extent_io_tree *tree,
	114	struct address_space *mapping, gfp_t mask);
	115	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
	116	int try_release_extent_mapping(struct extent_map_tree *map,
70dec807 CM	117	struct extent_io_tree tree, struct page page,
70dec807 CM	118	gfp_t mask);
7b13b7b1 CM	119	int try_release_extent_state(struct extent_map_tree *map,
	120	struct extent_io_tree tree, struct page page,
	121	gfp_t mask);
d1310b2e CM	122	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	123	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	124	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	125	get_extent_t *get_extent);
	126	int __init extent_io_init(void);
	127	void extent_io_exit(void);
	128
	129	u64 count_range_bits(struct extent_io_tree *tree,
	130	u64 *start, u64 search_end,
	131	u64 max_bytes, unsigned long bits);
	132
	133	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	134	int bits, int filled);
	135	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	136	int bits, gfp_t mask);
e6dcd2dc CM	137	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	138	int bits, int wake, int delete, gfp_t mask);
d1310b2e CM	139	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	140	int bits, gfp_t mask);
	141	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	142	gfp_t mask);
	143	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	144	gfp_t mask);
	145	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	146	gfp_t mask);
	147	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	148	gfp_t mask);
e6dcd2dc CM	149	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	150	gfp_t mask);
	151	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	152	u64 end, gfp_t mask);
d1310b2e CM	153	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	154	gfp_t mask);
e6dcd2dc CM	155	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	156	gfp_t mask);
d1310b2e CM	157	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	158	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	159	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	160	u64 start, int bits);
d1310b2e CM	161	int extent_invalidatepage(struct extent_io_tree *tree,
	162	struct page *page, unsigned long offset);
	163	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	164	get_extent_t *get_extent,
	165	struct writeback_control *wbc);
	166	int extent_writepages(struct extent_io_tree *tree,
	167	struct address_space *mapping,
	168	get_extent_t *get_extent,
	169	struct writeback_control *wbc);
	170	int extent_readpages(struct extent_io_tree *tree,
	171	struct address_space *mapping,
	172	struct list_head *pages, unsigned nr_pages,
	173	get_extent_t get_extent);
	174	int extent_prepare_write(struct extent_io_tree *tree,
	175	struct inode inode, struct page page,
	176	unsigned from, unsigned to, get_extent_t *get_extent);
	177	int extent_commit_write(struct extent_io_tree *tree,
	178	struct inode inode, struct page page,
	179	unsigned from, unsigned to);
	180	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	181	get_extent_t *get_extent);
	182	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	183	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	184	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	185	void set_page_extent_mapped(struct page *page);
	186
	187	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	188	u64 start, unsigned long len,
	189	struct page *page0,
	190	gfp_t mask);
	191	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	192	u64 start, unsigned long len,
	193	gfp_t mask);
	194	void free_extent_buffer(struct extent_buffer *eb);
	195	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	196	struct extent_buffer *eb, u64 start, int wait,
f188591e	197	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	198
	199	static inline void extent_buffer_get(struct extent_buffer *eb)
	200	{
	201	atomic_inc(&eb->refs);
	202	}
	203
	204	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	205	unsigned long start,
	206	unsigned long len);
	207	void read_extent_buffer(struct extent_buffer eb, void dst,
	208	unsigned long start,
	209	unsigned long len);
	210	void write_extent_buffer(struct extent_buffer eb, const void src,
	211	unsigned long start, unsigned long len);
	212	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	213	unsigned long dst_offset, unsigned long src_offset,
	214	unsigned long len);
	215	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	216	unsigned long src_offset, unsigned long len);
	217	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	218	unsigned long src_offset, unsigned long len);
	219	void memset_extent_buffer(struct extent_buffer *eb, char c,
	220	unsigned long start, unsigned long len);
	221	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	222	struct extent_buffer *eb);
e6dcd2dc CM	223	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	224	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	225	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	226	struct extent_buffer *eb);
	227	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	228	struct extent_buffer *eb);
	229	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	230	struct extent_buffer *eb);
1259ab75 CM	231	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	232	struct extent_buffer *eb);
d1310b2e CM	233	int extent_buffer_uptodate(struct extent_io_tree *tree,
	234	struct extent_buffer *eb);
	235	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	236	unsigned long min_len, char token, char map,
	237	unsigned long *map_start,
	238	unsigned long *map_len, int km);
	239	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	240	unsigned long min_len, char token, char map,
	241	unsigned long *map_start,
	242	unsigned long *map_len, int km);
	243	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
728131d8 CM	244	int invalidate_extent_lru(struct extent_io_tree *tree, u64 start,
728131d8 CM	245	unsigned long len);
ce9adaa5 CM	246	int release_extent_buffer_tail_pages(struct extent_buffer *eb);
	247	int extent_range_uptodate(struct extent_io_tree *tree,
	248	u64 start, u64 end);
d1310b2e	249	#endif