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- #ifndef __EXTENTMAP__
- #define __EXTENTMAP__
- #include <linux/rbtree.h>
- #define EXTENT_MAP_INLINE (u64)-2
- #define EXTENT_MAP_DELALLOC (u64)-1
- struct extent_map_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_map_tree {
- struct rb_root map;
- struct rb_root state;
- struct address_space *mapping;
- rwlock_t lock;
- struct extent_map_ops *ops;
- };
- /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
- struct extent_map {
- u64 start;
- u64 end; /* inclusive */
- int in_tree;
- struct rb_node rb_node;
- /* block_start and block_end are in bytes */
- u64 block_start;
- u64 block_end; /* inclusive */
- struct block_device *bdev;
- atomic_t refs;
- };
- /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
- 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;
- u64 end; /* inclusive */
- char *addr;
- struct page *pages[];
- };
- typedef struct extent_map *(get_extent_t)(struct inode *inode,
- struct page *page,
- size_t page_offset,
- u64 start, u64 end,
- int create);
- void extent_map_tree_init(struct extent_map_tree *tree,
- struct address_space *mapping, gfp_t mask);
- struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
- u64 start, u64 end);
- int add_extent_mapping(struct extent_map_tree *tree,
- struct extent_map *em);
- int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
- int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
- int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
- int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
- struct extent_map *alloc_extent_map(gfp_t mask);
- void free_extent_map(struct extent_map *em);
- int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
- get_extent_t *get_extent);
- void __init extent_map_init(void);
- void __exit extent_map_exit(void);
- int extent_clean_all_trees(struct extent_map_tree *tree);
- int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
- gfp_t mask);
- int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
- gfp_t mask);
- int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
- gfp_t mask);
- int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
- gfp_t mask);
- int extent_invalidatepage(struct extent_map_tree *tree,
- struct page *page, unsigned long offset);
- int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
- get_extent_t *get_extent,
- struct writeback_control *wbc);
- int extent_prepare_write(struct extent_map_tree *tree,
- struct inode *inode, struct page *page,
- unsigned from, unsigned to, get_extent_t *get_extent);
- int extent_commit_write(struct extent_map_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_map_tree *tree, u64 start, u64 end);
- int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
- int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
- #endif
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