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