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85 lines
2.4 KiB
85 lines
2.4 KiB
#ifndef __EXTENTMAP__ |
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#define __EXTENTMAP__ |
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#include <linux/rbtree.h> |
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#define EXTENT_MAP_LAST_BYTE ((u64)-4) |
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#define EXTENT_MAP_HOLE ((u64)-3) |
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#define EXTENT_MAP_INLINE ((u64)-2) |
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#define EXTENT_MAP_DELALLOC ((u64)-1) |
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/* bits for the flags field */ |
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#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */ |
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#define EXTENT_FLAG_COMPRESSED 1 |
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#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */ |
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#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */ |
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#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */ |
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#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */ |
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#define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */ |
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struct extent_map { |
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struct rb_node rb_node; |
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/* all of these are in bytes */ |
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u64 start; |
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u64 len; |
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u64 mod_start; |
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u64 mod_len; |
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u64 orig_start; |
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u64 orig_block_len; |
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u64 ram_bytes; |
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u64 block_start; |
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u64 block_len; |
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u64 generation; |
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unsigned long flags; |
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struct block_device *bdev; |
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atomic_t refs; |
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unsigned int compress_type; |
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struct list_head list; |
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}; |
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struct extent_map_tree { |
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struct rb_root map; |
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struct list_head modified_extents; |
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rwlock_t lock; |
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}; |
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static inline int extent_map_in_tree(const struct extent_map *em) |
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{ |
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return !RB_EMPTY_NODE(&em->rb_node); |
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} |
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static inline u64 extent_map_end(struct extent_map *em) |
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{ |
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if (em->start + em->len < em->start) |
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return (u64)-1; |
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return em->start + em->len; |
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} |
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static inline u64 extent_map_block_end(struct extent_map *em) |
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{ |
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if (em->block_start + em->block_len < em->block_start) |
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return (u64)-1; |
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return em->block_start + em->block_len; |
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} |
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void extent_map_tree_init(struct extent_map_tree *tree); |
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struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
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u64 start, u64 len); |
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int add_extent_mapping(struct extent_map_tree *tree, |
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struct extent_map *em, int modified); |
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int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); |
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void replace_extent_mapping(struct extent_map_tree *tree, |
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struct extent_map *cur, |
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struct extent_map *new, |
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int modified); |
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struct extent_map *alloc_extent_map(void); |
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void free_extent_map(struct extent_map *em); |
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int __init extent_map_init(void); |
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void extent_map_exit(void); |
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int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen); |
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void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em); |
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struct extent_map *search_extent_mapping(struct extent_map_tree *tree, |
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u64 start, u64 len); |
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#endif
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