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

#ifndef BTRFS_EXTENT_IO_TREE_H
#define BTRFS_EXTENT_IO_TREE_H

struct extent_changeset;
struct io_failure_record;

/* Bits for the extent state */
#define EXTENT_DIRTY		(1U << 0)
#define EXTENT_UPTODATE		(1U << 1)
#define EXTENT_LOCKED		(1U << 2)
#define EXTENT_NEW		(1U << 3)
#define EXTENT_DELALLOC		(1U << 4)
#define EXTENT_DEFRAG		(1U << 5)
#define EXTENT_BOUNDARY		(1U << 6)
#define EXTENT_NODATASUM	(1U << 7)
#define EXTENT_CLEAR_META_RESV	(1U << 8)
#define EXTENT_NEED_WAIT	(1U << 9)
#define EXTENT_NORESERVE	(1U << 11)
#define EXTENT_QGROUP_RESERVED	(1U << 12)
#define EXTENT_CLEAR_DATA_RESV	(1U << 13)
/*
 * Must be cleared only during ordered extent completion or on error paths if we
 * did not manage to submit bios and create the ordered extents for the range.
 * Should not be cleared during page release and page invalidation (if there is
 * an ordered extent in flight), that is left for the ordered extent completion.
 */
#define EXTENT_DELALLOC_NEW	(1U << 14)
/*
 * When an ordered extent successfully completes for a region marked as a new
 * delalloc range, use this flag when clearing a new delalloc range to indicate
 * that the VFS' inode number of bytes should be incremented and the inode's new
 * delalloc bytes decremented, in an atomic way to prevent races with stat(2).
 */
#define EXTENT_ADD_INODE_BYTES  (1U << 15)

/*
 * Set during truncate when we're clearing an entire range and we just want the
 * extent states to go away.
 */
#define EXTENT_CLEAR_ALL_BITS	(1U << 16)

#define EXTENT_DO_ACCOUNTING    (EXTENT_CLEAR_META_RESV | \
				 EXTENT_CLEAR_DATA_RESV)
#define EXTENT_CTLBITS		(EXTENT_DO_ACCOUNTING | \
				 EXTENT_ADD_INODE_BYTES | \
				 EXTENT_CLEAR_ALL_BITS)

/*
 * Redefined bits above which are used only in the device allocation tree,
 * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
 * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
 * manipulation functions
 */
#define CHUNK_ALLOCATED				EXTENT_DIRTY
#define CHUNK_TRIMMED				EXTENT_DEFRAG
#define CHUNK_STATE_MASK			(CHUNK_ALLOCATED |		\
						 CHUNK_TRIMMED)

enum {
	IO_TREE_FS_PINNED_EXTENTS,
	IO_TREE_FS_EXCLUDED_EXTENTS,
	IO_TREE_BTREE_INODE_IO,
	IO_TREE_INODE_IO,
	IO_TREE_RELOC_BLOCKS,
	IO_TREE_TRANS_DIRTY_PAGES,
	IO_TREE_ROOT_DIRTY_LOG_PAGES,
	IO_TREE_INODE_FILE_EXTENT,
	IO_TREE_LOG_CSUM_RANGE,
	IO_TREE_SELFTEST,
	IO_TREE_DEVICE_ALLOC_STATE,
};

struct extent_io_tree {
	struct rb_root state;
	struct btrfs_fs_info *fs_info;
	void *private_data;

	/* Who owns this io tree, should be one of IO_TREE_* */
	u8 owner;

	spinlock_t lock;
};

struct extent_state {
	u64 start;
	u64 end; /* inclusive */
	struct rb_node rb_node;

	/* ADD NEW ELEMENTS AFTER THIS */
	wait_queue_head_t wq;
	refcount_t refs;
	u32 state;

#ifdef CONFIG_BTRFS_DEBUG
	struct list_head leak_list;
#endif
};

void extent_io_tree_init(struct btrfs_fs_info *fs_info,
			 struct extent_io_tree *tree, unsigned int owner,
			 void *private_data);
void extent_io_tree_release(struct extent_io_tree *tree);

int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
		struct extent_state **cached);

int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);

int __init extent_state_init_cachep(void);
void __cold extent_state_free_cachep(void);

u64 count_range_bits(struct extent_io_tree *tree,
		     u64 *start, u64 search_end,
		     u64 max_bytes, u32 bits, int contig);

void free_extent_state(struct extent_state *state);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   u32 bits, int filled, struct extent_state *cached_state);
int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			     u32 bits, struct extent_changeset *changeset);
int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       u32 bits, struct extent_state **cached, gfp_t mask,
		       struct extent_changeset *changeset);

static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
				   u64 end, u32 bits,
				   struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, bits, cached,
				  GFP_NOFS, NULL);
}

static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
				struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
				  GFP_NOFS, NULL);
}

static inline int unlock_extent_atomic(struct extent_io_tree *tree, u64 start,
				       u64 end, struct extent_state **cached)
{
	return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached,
				  GFP_ATOMIC, NULL);
}

static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
				    u64 end, u32 bits)
{
	return clear_extent_bit(tree, start, end, bits, NULL);
}

int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
			   u32 bits, struct extent_changeset *changeset);
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		   u32 bits, struct extent_state **cached_state, gfp_t mask);

static inline int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start,
					 u64 end, u32 bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOWAIT);
}

static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
		u64 end, u32 bits)
{
	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOFS);
}

static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
				  cached_state, GFP_NOFS, NULL);
}

static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
		u64 end, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, mask);
}

static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
				     u64 end, struct extent_state **cached)
{
	return clear_extent_bit(tree, start, end,
				EXTENT_DIRTY | EXTENT_DELALLOC |
				EXTENT_DO_ACCOUNTING, cached);
}

int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
		       u32 bits, u32 clear_bits,
		       struct extent_state **cached_state);

static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
				      u64 end, u32 extra_bits,
				      struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | extra_bits,
			      cached_state, GFP_NOFS);
}

static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state)
{
	return set_extent_bit(tree, start, end,
			      EXTENT_DELALLOC | EXTENT_DEFRAG,
			      cached_state, GFP_NOFS);
}

static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
		u64 end)
{
	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, GFP_NOFS);
}

static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
		u64 end, struct extent_state **cached_state, gfp_t mask)
{
	return set_extent_bit(tree, start, end, EXTENT_UPTODATE,
			      cached_state, mask);
}

int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
			  u64 *start_ret, u64 *end_ret, u32 bits,
			  struct extent_state **cached_state);
void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
				 u64 *start_ret, u64 *end_ret, u32 bits);
int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
			       u64 *start_ret, u64 *end_ret, u32 bits);
bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
			       u64 *end, u64 max_bytes,
			       struct extent_state **cached_state);
void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits);

#endif /* BTRFS_EXTENT_IO_TREE_H */