[linux-2.6-block.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 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_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
7f3c74fb CM	14	/* bits for the flags field */
7f3c74fb CM	15	#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
c8b97818	16	#define EXTENT_FLAG_COMPRESSED 1
d899e052	17	#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
ff44c6e3	18	#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
b11e234d	19	#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
298a8f9c	20	#define EXTENT_FLAG_FS_MAPPING 6 /* filesystem extent mapping type */
7f3c74fb	21
a52d9a80	22	struct extent_map {
a52d9a80	23	struct rb_node rb_node;
d1310b2e CM	24
	25	/* all of these are in bytes */
	26	u64 start;
	27	u64 len;
4e2f84e6 LB	28	u64 mod_start;
4e2f84e6 LB	29	u64 mod_len;
ff5b7ee3	30	u64 orig_start;
b4939680	31	u64 orig_block_len;
cc95bef6	32	u64 ram_bytes;
a52d9a80	33	u64 block_start;
c8b97818	34	u64 block_len;
5dc562c5	35	u64 generation;
d1310b2e	36	unsigned long flags;
95617d69 JM	37	union {
	38	struct block_device *bdev;
	39
	40	/*
	41	* used for chunk mappings
	42	* flags & EXTENT_FLAG_FS_MAPPING must be set
	43	*/
	44	struct map_lookup *map_lookup;
	45	};
490b54d6	46	refcount_t refs;
c08782da	47	unsigned int compress_type;
5dc562c5	48	struct list_head list;
a52d9a80 CM	49	};
a52d9a80 CM	50
d1310b2e	51	struct extent_map_tree {
07e1ce09	52	struct rb_root_cached map;
5dc562c5	53	struct list_head modified_extents;
890871be	54	rwlock_t lock;
a52d9a80 CM	55	};
a52d9a80 CM	56
cbc0e928 FM	57	static inline int extent_map_in_tree(const struct extent_map *em)
	58	{
	59	return !RB_EMPTY_NODE(&em->rb_node);
	60	}
	61
d1310b2e CM	62	static inline u64 extent_map_end(struct extent_map *em)
	63	{
	64	if (em->start + em->len < em->start)
	65	return (u64)-1;
	66	return em->start + em->len;
	67	}
	68
	69	static inline u64 extent_map_block_end(struct extent_map *em)
	70	{
c8b97818	71	if (em->block_start + em->block_len < em->block_start)
d1310b2e	72	return (u64)-1;
c8b97818	73	return em->block_start + em->block_len;
d1310b2e	74	}
a52d9a80	75
a8067e02	76	void extent_map_tree_init(struct extent_map_tree *tree);
a52d9a80	77	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
d1310b2e	78	u64 start, u64 len);
a52d9a80	79	int add_extent_mapping(struct extent_map_tree *tree,
09a2a8f9	80	struct extent_map *em, int modified);
c1766dd7	81	void remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
176840b3 FM	82	void replace_extent_mapping(struct extent_map_tree *tree,
	83	struct extent_map *cur,
	84	struct extent_map *new,
	85	int modified);
d1310b2e	86
172ddd60	87	struct extent_map *alloc_extent_map(void);
a52d9a80	88	void free_extent_map(struct extent_map *em);
2f4cbe64	89	int __init extent_map_init(void);
e67c718b	90	void __cold extent_map_exit(void);
5dc562c5	91	int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
201a9038	92	void clear_em_logging(struct extent_map_tree tree, struct extent_map em);
b917b7c3 CM	93	struct extent_map search_extent_mapping(struct extent_map_tree tree,
b917b7c3 CM	94	u64 start, u64 len);
f46b24c9 DS	95	int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
f46b24c9 DS	96	struct extent_map_tree *em_tree,
c04e61b5	97	struct extent_map **em_in, u64 start, u64 len);
9888c340	98
a52d9a80	99	#endif