Release 4.17 fs/btrfs/extent_map.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef BTRFS_EXTENT_MAP_H

#define BTRFS_EXTENT_MAP_H

#include <linux/rbtree.h>
#include <linux/refcount.h>


#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)

/* bits for the flags field */

#define EXTENT_FLAG_PINNED 0 
/* this entry not yet on disk, don't free it */

#define EXTENT_FLAG_COMPRESSED 1

#define EXTENT_FLAG_PREALLOC 3 
/* pre-allocated extent */

#define EXTENT_FLAG_LOGGING 4 
/* Logging this extent */

#define EXTENT_FLAG_FILLING 5 
/* Filling in a preallocated extent */

#define EXTENT_FLAG_FS_MAPPING 6 
/* filesystem extent mapping type */


struct extent_map {
	
struct rb_node rb_node;

	/* all of these are in bytes */
	
u64 start;
	
u64 len;
	
u64 mod_start;
	
u64 mod_len;
	
u64 orig_start;
	
u64 orig_block_len;
	
u64 ram_bytes;
	
u64 block_start;
	
u64 block_len;
	
u64 generation;
	
unsigned long flags;
	
union {
		
struct block_device *bdev;

		/*
                 * used for chunk mappings
                 * flags & EXTENT_FLAG_FS_MAPPING must be set
                 */
		
struct map_lookup *map_lookup;
	};
	
refcount_t refs;
	
unsigned int compress_type;
	
struct list_head list;
};


struct extent_map_tree {
	
struct rb_root map;
	
struct list_head modified_extents;
	
rwlock_t lock;
};



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;
}

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static inline u64 extent_map_block_end(struct extent_map *em)
{
	if (em->block_start + em->block_len < em->block_start)
		return (u64)-1;
	return em->block_start + em->block_len;
}

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void extent_map_tree_init(struct extent_map_tree *tree);
struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
					 u64 start, u64 len);
int add_extent_mapping(struct extent_map_tree *tree,
		       struct extent_map *em, int modified);
int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
void replace_extent_mapping(struct extent_map_tree *tree,
			    struct extent_map *cur,
			    struct extent_map *new,
			    int modified);

struct extent_map *alloc_extent_map(void);
void free_extent_map(struct extent_map *em);
int __init extent_map_init(void);
void __cold extent_map_exit(void);
int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
					 u64 start, u64 len);
int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
			     struct extent_map **em_in, u64 start, u64 len);

#endif
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2
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2
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Jeff Mahoney
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Zheng Yan
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6.45%
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Elena Reshetova
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Directory: fs/btrfs

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