extent_map.h 2.54 KB
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#ifndef __EXTENTMAP__
#define __EXTENTMAP__

#include <linux/rbtree.h>

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#define EXTENT_MAP_LAST_BYTE ((u64)-4)
#define EXTENT_MAP_HOLE ((u64)-3)
#define EXTENT_MAP_INLINE ((u64)-2)
#define EXTENT_MAP_DELALLOC ((u64)-1)
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/* bits for the flags field */
#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 {
	struct rb_node rb_node;
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	/* all of these are in bytes */
	u64 start;
	u64 len;
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	u64 mod_start;
	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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	union {
		struct block_device *bdev;

		/*
		 * used for chunk mappings
		 * flags & EXTENT_FLAG_FS_MAPPING must be set
		 */
		struct map_lookup *map_lookup;
	};
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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 {
	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)
{
	return !RB_EMPTY_NODE(&em->rb_node);
}

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static inline u64 extent_map_end(struct extent_map *em)
{
	if (em->start + em->len < em->start)
		return (u64)-1;
	return em->start + em->len;
}

static inline u64 extent_map_block_end(struct extent_map *em)
{
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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,
			    struct extent_map *cur,
			    struct extent_map *new,
			    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,
					 u64 start, u64 len);
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#endif