update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / spdk / lib / blobfs / tree.h

/*-
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 *
 *   Copyright (c) Intel Corporation.
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 *       notice, this list of conditions and the following disclaimer.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
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 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef SPDK_TREE_H_
#define SPDK_TREE_H_

struct cache_buffer {
	uint8_t			*buf;
	uint64_t		offset;
	uint32_t		buf_size;
	uint32_t		bytes_filled;
	uint32_t		bytes_flushed;
	bool			in_progress;
};

extern uint32_t g_fs_cache_buffer_shift;

#define CACHE_BUFFER_SHIFT_DEFAULT 18
#define CACHE_BUFFER_SIZE (1U << g_fs_cache_buffer_shift)
#define NEXT_CACHE_BUFFER_OFFSET(offset)	\
	(((offset + CACHE_BUFFER_SIZE) >> g_fs_cache_buffer_shift) << g_fs_cache_buffer_shift)

#define CACHE_TREE_SHIFT 6
#define CACHE_TREE_WIDTH (1U << CACHE_TREE_SHIFT)
#define CACHE_TREE_LEVEL_SHIFT(level)	(g_fs_cache_buffer_shift + (level) * CACHE_TREE_SHIFT)
#define CACHE_TREE_LEVEL_SIZE(level)	(1ULL << CACHE_TREE_LEVEL_SHIFT(level))
#define CACHE_TREE_LEVEL_MASK(level)	(CACHE_TREE_LEVEL_SIZE(level) - 1)
#define CACHE_TREE_INDEX(level, offset)	((offset >> CACHE_TREE_LEVEL_SHIFT(level)) & (CACHE_TREE_WIDTH - 1))

struct cache_tree {
	uint8_t			level;
	uint64_t		present_mask;
	union {
		struct cache_buffer	*buffer[CACHE_TREE_WIDTH];
		struct cache_tree	*tree[CACHE_TREE_WIDTH];
	} u;
};

void cache_buffer_free(struct cache_buffer *cache_buffer);

struct cache_tree *tree_insert_buffer(struct cache_tree *root, struct cache_buffer *buffer);
void tree_free_buffers(struct cache_tree *tree);
struct cache_buffer *tree_find_buffer(struct cache_tree *tree, uint64_t offset);
struct cache_buffer *tree_find_filled_buffer(struct cache_tree *tree, uint64_t offset);
void tree_remove_buffer(struct cache_tree *tree, struct cache_buffer *buffer);

#endif /* SPDK_TREE_H_ */