[mirror_ubuntu-jammy-kernel.git] / 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 extent_map::flags field */
enum {
	/* this entry not yet on disk, don't free it */
	EXTENT_FLAG_PINNED,
	EXTENT_FLAG_COMPRESSED,
	/* pre-allocated extent */
	EXTENT_FLAG_PREALLOC,
	/* Logging this extent */
	EXTENT_FLAG_LOGGING,
	/* Filling in a preallocated extent */
	EXTENT_FLAG_FILLING,
	/* filesystem extent mapping type */
	EXTENT_FLAG_FS_MAPPING,
};

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_cached 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);
}

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)
{
	if (em->block_start + em->block_len < em->block_start)
		return (u64)-1;
	return em->block_start + em->block_len;
}

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);
void 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 btrfs_fs_info *fs_info,
			     struct extent_map_tree *em_tree,
			     struct extent_map **em_in, u64 start, u64 len);

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
9888c340 DS	2
	3	#ifndef BTRFS_EXTENT_MAP_H
	4	#define BTRFS_EXTENT_MAP_H
a52d9a80 CM	5
a52d9a80 CM	6	#include <linux/rbtree.h>
490b54d6	7	#include <linux/refcount.h>
a52d9a80	8
e248e04e DG	9	#define EXTENT_MAP_LAST_BYTE ((u64)-4)
	10	#define EXTENT_MAP_HOLE ((u64)-3)
	11	#define EXTENT_MAP_INLINE ((u64)-2)
	12	#define EXTENT_MAP_DELALLOC ((u64)-1)
a52d9a80	13
50b5b602 DS	14	/* bits for the extent_map::flags field */
	15	enum {
	16	/* this entry not yet on disk, don't free it */
	17	EXTENT_FLAG_PINNED,
	18	EXTENT_FLAG_COMPRESSED,
	19	/* pre-allocated extent */
	20	EXTENT_FLAG_PREALLOC,
	21	/* Logging this extent */
	22	EXTENT_FLAG_LOGGING,
	23	/* Filling in a preallocated extent */
	24	EXTENT_FLAG_FILLING,
	25	/* filesystem extent mapping type */
	26	EXTENT_FLAG_FS_MAPPING,
	27	};
7f3c74fb	28
a52d9a80	29	struct extent_map {
a52d9a80	30	struct rb_node rb_node;
d1310b2e CM	31
	32	/* all of these are in bytes */
	33	u64 start;
	34	u64 len;
4e2f84e6 LB	35	u64 mod_start;
4e2f84e6 LB	36	u64 mod_len;
ff5b7ee3	37	u64 orig_start;
b4939680	38	u64 orig_block_len;
cc95bef6	39	u64 ram_bytes;
a52d9a80	40	u64 block_start;
c8b97818	41	u64 block_len;
5dc562c5	42	u64 generation;
d1310b2e	43	unsigned long flags;
95617d69 JM	44	union {
	45	struct block_device *bdev;
	46
	47	/*
	48	* used for chunk mappings
	49	* flags & EXTENT_FLAG_FS_MAPPING must be set
	50	*/
	51	struct map_lookup *map_lookup;
	52	};
490b54d6	53	refcount_t refs;
c08782da	54	unsigned int compress_type;
5dc562c5	55	struct list_head list;
a52d9a80 CM	56	};
a52d9a80 CM	57
d1310b2e	58	struct extent_map_tree {
07e1ce09	59	struct rb_root_cached map;
5dc562c5	60	struct list_head modified_extents;
890871be	61	rwlock_t lock;
a52d9a80 CM	62	};
a52d9a80 CM	63
cbc0e928 FM	64	static inline int extent_map_in_tree(const struct extent_map *em)
	65	{
	66	return !RB_EMPTY_NODE(&em->rb_node);
	67	}
	68
d1310b2e CM	69	static inline u64 extent_map_end(struct extent_map *em)
	70	{
	71	if (em->start + em->len < em->start)
	72	return (u64)-1;
	73	return em->start + em->len;
	74	}
	75
	76	static inline u64 extent_map_block_end(struct extent_map *em)
	77	{
c8b97818	78	if (em->block_start + em->block_len < em->block_start)
d1310b2e	79	return (u64)-1;
c8b97818	80	return em->block_start + em->block_len;
d1310b2e	81	}
a52d9a80	82
a8067e02	83	void extent_map_tree_init(struct extent_map_tree *tree);
a52d9a80	84	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
d1310b2e	85	u64 start, u64 len);
a52d9a80	86	int add_extent_mapping(struct extent_map_tree *tree,
09a2a8f9	87	struct extent_map *em, int modified);
c1766dd7	88	void remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
176840b3 FM	89	void replace_extent_mapping(struct extent_map_tree *tree,
	90	struct extent_map *cur,
	91	struct extent_map *new,
	92	int modified);
d1310b2e	93
172ddd60	94	struct extent_map *alloc_extent_map(void);
a52d9a80	95	void free_extent_map(struct extent_map *em);
2f4cbe64	96	int __init extent_map_init(void);
e67c718b	97	void __cold extent_map_exit(void);
5dc562c5	98	int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
201a9038	99	void clear_em_logging(struct extent_map_tree tree, struct extent_map em);
b917b7c3 CM	100	struct extent_map search_extent_mapping(struct extent_map_tree tree,
b917b7c3 CM	101	u64 start, u64 len);
f46b24c9 DS	102	int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
f46b24c9 DS	103	struct extent_map_tree *em_tree,
c04e61b5	104	struct extent_map **em_in, u64 start, u64 len);
9888c340	105
a52d9a80	106	#endif