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- #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_state;
- 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,
- struct extent_state *state);
- void (*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 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;
- 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 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);
- 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
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