[thirdparty/kernel/stable.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)
/* used only during fiemap calls */
#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)
951e05a9	12	/* used only during fiemap calls */
e248e04e	13	#define EXTENT_MAP_DELALLOC ((u64)-1)
a52d9a80	14
50b5b602 DS	15	/* bits for the extent_map::flags field */
	16	enum {
	17	/* this entry not yet on disk, don't free it */
	18	EXTENT_FLAG_PINNED,
	19	EXTENT_FLAG_COMPRESSED,
	20	/* pre-allocated extent */
	21	EXTENT_FLAG_PREALLOC,
	22	/* Logging this extent */
	23	EXTENT_FLAG_LOGGING,
	24	/* Filling in a preallocated extent */
	25	EXTENT_FLAG_FILLING,
	26	/* filesystem extent mapping type */
	27	EXTENT_FLAG_FS_MAPPING,
	28	};
7f3c74fb	29
a52d9a80	30	struct extent_map {
a52d9a80	31	struct rb_node rb_node;
d1310b2e CM	32
	33	/* all of these are in bytes */
	34	u64 start;
	35	u64 len;
4e2f84e6 LB	36	u64 mod_start;
4e2f84e6 LB	37	u64 mod_len;
ff5b7ee3	38	u64 orig_start;
b4939680	39	u64 orig_block_len;
cc95bef6	40	u64 ram_bytes;
a52d9a80	41	u64 block_start;
c8b97818	42	u64 block_len;
5dc562c5	43	u64 generation;
d1310b2e	44	unsigned long flags;
95617d69 JM	45	union {
	46	struct block_device *bdev;
	47
	48	/*
	49	* used for chunk mappings
	50	* flags & EXTENT_FLAG_FS_MAPPING must be set
	51	*/
	52	struct map_lookup *map_lookup;
	53	};
490b54d6	54	refcount_t refs;
c08782da	55	unsigned int compress_type;
5dc562c5	56	struct list_head list;
a52d9a80 CM	57	};
a52d9a80 CM	58
d1310b2e	59	struct extent_map_tree {
07e1ce09	60	struct rb_root_cached map;
5dc562c5	61	struct list_head modified_extents;
890871be	62	rwlock_t lock;
a52d9a80 CM	63	};
a52d9a80 CM	64
cbc0e928 FM	65	static inline int extent_map_in_tree(const struct extent_map *em)
	66	{
	67	return !RB_EMPTY_NODE(&em->rb_node);
	68	}
	69
d1310b2e CM	70	static inline u64 extent_map_end(struct extent_map *em)
	71	{
	72	if (em->start + em->len < em->start)
	73	return (u64)-1;
	74	return em->start + em->len;
	75	}
	76
	77	static inline u64 extent_map_block_end(struct extent_map *em)
	78	{
c8b97818	79	if (em->block_start + em->block_len < em->block_start)
d1310b2e	80	return (u64)-1;
c8b97818	81	return em->block_start + em->block_len;
d1310b2e	82	}
a52d9a80	83
a8067e02	84	void extent_map_tree_init(struct extent_map_tree *tree);
a52d9a80	85	struct extent_map lookup_extent_mapping(struct extent_map_tree tree,
d1310b2e	86	u64 start, u64 len);
a52d9a80	87	int add_extent_mapping(struct extent_map_tree *tree,
09a2a8f9	88	struct extent_map *em, int modified);
c1766dd7	89	void remove_extent_mapping(struct extent_map_tree tree, struct extent_map em);
176840b3 FM	90	void replace_extent_mapping(struct extent_map_tree *tree,
	91	struct extent_map *cur,
	92	struct extent_map *new,
	93	int modified);
d1310b2e	94
172ddd60	95	struct extent_map *alloc_extent_map(void);
a52d9a80	96	void free_extent_map(struct extent_map *em);
2f4cbe64	97	int __init extent_map_init(void);
e67c718b	98	void __cold extent_map_exit(void);
5dc562c5	99	int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
201a9038	100	void clear_em_logging(struct extent_map_tree tree, struct extent_map em);
b917b7c3 CM	101	struct extent_map search_extent_mapping(struct extent_map_tree tree,
b917b7c3 CM	102	u64 start, u64 len);
f46b24c9 DS	103	int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
f46b24c9 DS	104	struct extent_map_tree *em_tree,
c04e61b5	105	struct extent_map **em_in, u64 start, u64 len);
9888c340	106
a52d9a80	107	#endif