[mirror_ubuntu-jammy-kernel.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_CSUM (1 << 9)
#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_io_ops {
	int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
	int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
	int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
	void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
};

struct extent_io_tree {
	struct rb_root state;
	struct address_space *mapping;
	u64 dirty_bytes;
	rwlock_t lock;
	struct extent_io_ops *ops;
	spinlock_t lru_lock;
	struct list_head buffer_lru;
	int lru_size;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	int in_tree;
	struct rb_node rb_node;
	wait_queue_head_t wq;
	atomic_t refs;
	unsigned long state;

	/* for use by the FS */
	u64 private;

	struct list_head 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 extent_map_tree;

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);
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);
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);

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);
#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)
	16	#define EXTENT_CSUM (1 << 9)
	17	#define EXTENT_IOBITS (EXTENT_LOCKED \| EXTENT_WRITEBACK)
	18
	19	/*
	20	* page->private values. Every page that is controlled by the extent
	21	* map has page->private set to one.
	22	*/
	23	#define EXTENT_PAGE_PRIVATE 1
	24	#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
	25
	26	struct extent_io_ops {
	27	int (fill_delalloc)(struct inode inode, u64 start, u64 end);
	28	int (writepage_io_hook)(struct page page, u64 start, u64 end);
	29	int (readpage_io_hook)(struct page page, u64 start, u64 end);
	30	int (readpage_end_io_hook)(struct page page, u64 start, u64 end);
	31	void (writepage_end_io_hook)(struct page page, u64 start, u64 end);
	32	};
	33
	34	struct extent_io_tree {
	35	struct rb_root state;
	36	struct address_space *mapping;
	37	u64 dirty_bytes;
	38	rwlock_t lock;
	39	struct extent_io_ops *ops;
	40	spinlock_t lru_lock;
	41	struct list_head buffer_lru;
	42	int lru_size;
	43	};
	44
	45	struct extent_state {
	46	u64 start;
	47	u64 end; /* inclusive */
	48	int in_tree;
	49	struct rb_node rb_node;
	50	wait_queue_head_t wq;
	51	atomic_t refs;
	52	unsigned long state;
	53
	54	/* for use by the FS */
	55	u64 private;
	56
	57	struct list_head list;
	58	};
	59
	60	struct extent_buffer {
	61	u64 start;
	62	unsigned long len;
	63	char *map_token;
	64	char *kaddr;
65	unsigned long map_start;
66	unsigned long map_len;
67	struct page *first_page;
68	struct list_head lru;
69	atomic_t refs;
70	int flags;
71	};
72
73	struct extent_map_tree;
74
75	typedef struct extent_map (get_extent_t)(struct inode inode,
76	struct page *page,
77	size_t page_offset,
78	u64 start, u64 len,
79	int create);
80
81	void extent_io_tree_init(struct extent_io_tree *tree,
82	struct address_space *mapping, gfp_t mask);
83	void extent_io_tree_empty_lru(struct extent_io_tree *tree);
84	int try_release_extent_mapping(struct extent_map_tree *map,
85	struct extent_io_tree tree, struct page page);
86	int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
87	int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
88	int extent_read_full_page(struct extent_io_tree tree, struct page page,
89	get_extent_t *get_extent);
90	int __init extent_io_init(void);
91	void extent_io_exit(void);
92
93	u64 count_range_bits(struct extent_io_tree *tree,
94	u64 *start, u64 search_end,
95	u64 max_bytes, unsigned long bits);
96
97	int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
98	int bits, int filled);
99	int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
100	int bits, gfp_t mask);
101	int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
102	int bits, gfp_t mask);
103	int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
104	gfp_t mask);
105	int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
106	gfp_t mask);
107	int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
108	gfp_t mask);
109	int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
110	gfp_t mask);
111	int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
112	gfp_t mask);
113	int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
114	u64 start_ret, u64 end_ret, int bits);
115	int extent_invalidatepage(struct extent_io_tree *tree,
116	struct page *page, unsigned long offset);
117	int extent_write_full_page(struct extent_io_tree tree, struct page page,
118	get_extent_t *get_extent,
119	struct writeback_control *wbc);
120	int extent_writepages(struct extent_io_tree *tree,
121	struct address_space *mapping,
122	get_extent_t *get_extent,
123	struct writeback_control *wbc);
124	int extent_readpages(struct extent_io_tree *tree,
125	struct address_space *mapping,
126	struct list_head *pages, unsigned nr_pages,
127	get_extent_t get_extent);
128	int extent_prepare_write(struct extent_io_tree *tree,
129	struct inode inode, struct page page,
130	unsigned from, unsigned to, get_extent_t *get_extent);
131	int extent_commit_write(struct extent_io_tree *tree,
132	struct inode inode, struct page page,
133	unsigned from, unsigned to);
134	sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
135	get_extent_t *get_extent);
136	int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
137	int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
138	int get_state_private(struct extent_io_tree tree, u64 start, u64 private);
139	void set_page_extent_mapped(struct page *page);
140
141	struct extent_buffer alloc_extent_buffer(struct extent_io_tree tree,
142	u64 start, unsigned long len,
143	struct page *page0,
144	gfp_t mask);
145	struct extent_buffer find_extent_buffer(struct extent_io_tree tree,
146	u64 start, unsigned long len,
147	gfp_t mask);
148	void free_extent_buffer(struct extent_buffer *eb);
149	int read_extent_buffer_pages(struct extent_io_tree *tree,
150	struct extent_buffer *eb, u64 start, int wait);
151
152	static inline void extent_buffer_get(struct extent_buffer *eb)
153	{
154	atomic_inc(&eb->refs);
155	}
156
157	int memcmp_extent_buffer(struct extent_buffer eb, const void ptrv,
158	unsigned long start,
159	unsigned long len);
160	void read_extent_buffer(struct extent_buffer eb, void dst,
161	unsigned long start,
162	unsigned long len);
163	void write_extent_buffer(struct extent_buffer eb, const void src,
164	unsigned long start, unsigned long len);
165	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
166	unsigned long dst_offset, unsigned long src_offset,
167	unsigned long len);
168	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
169	unsigned long src_offset, unsigned long len);
170	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
171	unsigned long src_offset, unsigned long len);
172	void memset_extent_buffer(struct extent_buffer *eb, char c,
173	unsigned long start, unsigned long len);
174	int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
175	struct extent_buffer *eb);
176	int clear_extent_buffer_dirty(struct extent_io_tree *tree,
177	struct extent_buffer *eb);
178	int set_extent_buffer_dirty(struct extent_io_tree *tree,
179	struct extent_buffer *eb);
180	int set_extent_buffer_uptodate(struct extent_io_tree *tree,
181	struct extent_buffer *eb);
182	int extent_buffer_uptodate(struct extent_io_tree *tree,
183	struct extent_buffer *eb);
184	int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
185	unsigned long min_len, char token, char map,
186	unsigned long *map_start,
187	unsigned long *map_len, int km);
188	int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
189	unsigned long min_len, char token, char map,
190	unsigned long *map_start,
191	unsigned long *map_len, int km);
192	void unmap_extent_buffer(struct extent_buffer eb, char token, int km);
193	#endif