[net-next-2.6.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_BOUNDARY (1 << 11)
#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);
	int (*write_cache_pages_lock_hook)(struct page *page);
};

struct extent_io_tree {
	struct rb_root state;
	struct rb_root buffer;
	struct address_space *mapping;
	u64 dirty_bytes;
	spinlock_t lock;
	spinlock_t buffer_lock;
	struct extent_io_ops *ops;
};

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;
	atomic_t refs;
	int flags;
	struct list_head leak_list;
	struct rb_node rb_node;
	struct mutex mutex;
};

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);
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_buffer(struct extent_io_tree *tree, struct page *page);
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 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)
5b21f2ed	18	#define EXTENT_BOUNDARY (1 << 11)
d1310b2e CM	19	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	20
	21	/*
	22	* page->private values. Every page that is controlled by the extent
	23	* map has page->private set to one.
	24	*/
	25	#define EXTENT_PAGE_PRIVATE 1
	26	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	27
70dec807 CM	28	struct extent_state;
70dec807 CM	29
44b8bd7e CM	30	typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
44b8bd7e CM	31	struct bio *bio, int mirror_num);
d1310b2e CM	32	struct extent_io_ops {
d1310b2e CM	33	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
247e743c	34	int (writepage_start_hook)(struct page page, u64 start, u64 end);
d1310b2e	35	int (writepage_io_hook)(struct page page, u64 start, u64 end);
44b8bd7e	36	extent_submit_bio_hook_t *submit_bio_hook;
239b14b3 CM	37	int (merge_bio_hook)(struct page page, unsigned long offset,
239b14b3 CM	38	size_t size, struct bio *bio);
d1310b2e	39	int (readpage_io_hook)(struct page page, u64 start, u64 end);
7e38326f CM	40	int (readpage_io_failed_hook)(struct bio bio, struct page *page,
	41	u64 start, u64 end,
	42	struct extent_state *state);
1259ab75 CM	43	int (writepage_io_failed_hook)(struct bio bio, struct page *page,
	44	u64 start, u64 end,
	45	struct extent_state *state);
70dec807 CM	46	int (readpage_end_io_hook)(struct page page, u64 start, u64 end,
70dec807 CM	47	struct extent_state *state);
1259ab75	48	int (writepage_end_io_hook)(struct page page, u64 start, u64 end,
e6dcd2dc	49	struct extent_state *state, int uptodate);
291d673e	50	int (set_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	51	unsigned long old, unsigned long bits);
291d673e	52	int (clear_bit_hook)(struct inode inode, u64 start, u64 end,
b0c68f8b	53	unsigned long old, unsigned long bits);
4bef0848	54	int (write_cache_pages_lock_hook)(struct page page);
d1310b2e CM	55	};
	56
	57	struct extent_io_tree {
	58	struct rb_root state;
6af118ce	59	struct rb_root buffer;
d1310b2e CM	60	struct address_space *mapping;
d1310b2e CM	61	u64 dirty_bytes;
70dec807	62	spinlock_t lock;
6af118ce	63	spinlock_t buffer_lock;
d1310b2e	64	struct extent_io_ops *ops;
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;
d1310b2e CM	90	atomic_t refs;
d1310b2e CM	91	int flags;
2d2ae547	92	struct list_head leak_list;
6af118ce	93	struct rb_node rb_node;
a61e6f29	94	struct mutex mutex;
d1310b2e CM	95	};
	96
	97	struct extent_map_tree;
	98
d7fc640e CM	99	static inline struct extent_state extent_state_next(struct extent_state state)
	100	{
	101	struct rb_node *node;
	102	node = rb_next(&state->rb_node);
	103	if (!node)
	104	return NULL;
	105	return rb_entry(node, struct extent_state, rb_node);
	106	}
	107
d1310b2e CM	108	typedef struct extent_map (get_extent_t)(struct inode inode,
	109	struct page *page,
	110	size_t page_offset,
	111	u64 start, u64 len,
	112	int create);
	113
	114	void extent_io_tree_init(struct extent_io_tree *tree,
	115	struct address_space *mapping, gfp_t mask);
d1310b2e	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);
6af118ce	119	int try_release_extent_buffer(struct extent_io_tree tree, struct page page);
7b13b7b1 CM	120	int try_release_extent_state(struct extent_map_tree *map,
	121	struct extent_io_tree tree, struct page page,
	122	gfp_t mask);
d1310b2e CM	123	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	124	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
	125	int extent_read_full_page(struct extent_io_tree tree, struct page page,
	126	get_extent_t *get_extent);
	127	int __init extent_io_init(void);
	128	void extent_io_exit(void);
	129
	130	u64 count_range_bits(struct extent_io_tree *tree,
	131	u64 *start, u64 search_end,
	132	u64 max_bytes, unsigned long bits);
	133
	134	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
	135	int bits, int filled);
	136	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	137	int bits, gfp_t mask);
e6dcd2dc CM	138	int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	139	int bits, int wake, int delete, gfp_t mask);
d1310b2e CM	140	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
	141	int bits, gfp_t mask);
	142	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
	143	gfp_t mask);
	144	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
	145	gfp_t mask);
	146	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	147	gfp_t mask);
	148	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
	149	gfp_t mask);
e6dcd2dc CM	150	int clear_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
	151	gfp_t mask);
	152	int clear_extent_ordered_metadata(struct extent_io_tree *tree, u64 start,
	153	u64 end, gfp_t mask);
d1310b2e CM	154	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
d1310b2e CM	155	gfp_t mask);
e6dcd2dc CM	156	int set_extent_ordered(struct extent_io_tree *tree, u64 start, u64 end,
e6dcd2dc CM	157	gfp_t mask);
d1310b2e CM	158	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
d1310b2e CM	159	u64 start_ret, u64 end_ret, int bits);
d7fc640e CM	160	struct extent_state find_first_extent_bit_state(struct extent_io_tree tree,
d7fc640e CM	161	u64 start, int bits);
d1310b2e CM	162	int extent_invalidatepage(struct extent_io_tree *tree,
	163	struct page *page, unsigned long offset);
	164	int extent_write_full_page(struct extent_io_tree tree, struct page page,
	165	get_extent_t *get_extent,
	166	struct writeback_control *wbc);
	167	int extent_writepages(struct extent_io_tree *tree,
	168	struct address_space *mapping,
	169	get_extent_t *get_extent,
	170	struct writeback_control *wbc);
	171	int extent_readpages(struct extent_io_tree *tree,
	172	struct address_space *mapping,
	173	struct list_head *pages, unsigned nr_pages,
	174	get_extent_t get_extent);
	175	int extent_prepare_write(struct extent_io_tree *tree,
	176	struct inode inode, struct page page,
	177	unsigned from, unsigned to, get_extent_t *get_extent);
	178	int extent_commit_write(struct extent_io_tree *tree,
	179	struct inode inode, struct page page,
	180	unsigned from, unsigned to);
	181	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
	182	get_extent_t *get_extent);
	183	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
	184	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
	185	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
	186	void set_page_extent_mapped(struct page *page);
	187
	188	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
	189	u64 start, unsigned long len,
	190	struct page *page0,
	191	gfp_t mask);
	192	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
	193	u64 start, unsigned long len,
	194	gfp_t mask);
	195	void free_extent_buffer(struct extent_buffer *eb);
	196	int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7	197	struct extent_buffer *eb, u64 start, int wait,
f188591e	198	get_extent_t *get_extent, int mirror_num);
d1310b2e CM	199
	200	static inline void extent_buffer_get(struct extent_buffer *eb)
	201	{
	202	atomic_inc(&eb->refs);
	203	}
	204
	205	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
	206	unsigned long start,
	207	unsigned long len);
	208	void read_extent_buffer(struct extent_buffer eb, void dst,
	209	unsigned long start,
	210	unsigned long len);
	211	void write_extent_buffer(struct extent_buffer eb, const void src,
	212	unsigned long start, unsigned long len);
	213	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	214	unsigned long dst_offset, unsigned long src_offset,
	215	unsigned long len);
	216	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	217	unsigned long src_offset, unsigned long len);
	218	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	219	unsigned long src_offset, unsigned long len);
	220	void memset_extent_buffer(struct extent_buffer *eb, char c,
	221	unsigned long start, unsigned long len);
	222	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
	223	struct extent_buffer *eb);
e6dcd2dc CM	224	int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end);
e6dcd2dc CM	225	int wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits);
d1310b2e CM	226	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
	227	struct extent_buffer *eb);
	228	int set_extent_buffer_dirty(struct extent_io_tree *tree,
	229	struct extent_buffer *eb);
	230	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
	231	struct extent_buffer *eb);
1259ab75 CM	232	int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
1259ab75 CM	233	struct extent_buffer *eb);
d1310b2e CM	234	int extent_buffer_uptodate(struct extent_io_tree *tree,
	235	struct extent_buffer *eb);
	236	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	237	unsigned long min_len, char token, char map,
	238	unsigned long *map_start,
	239	unsigned long *map_len, int km);
	240	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
	241	unsigned long min_len, char token, char map,
	242	unsigned long *map_start,
	243	unsigned long *map_len, int km);
	244	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
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