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Several B-tree optimizations. #13582

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Jun 24, 2022
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Several B-tree optimizations. #13582

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12 changes: 10 additions & 2 deletions include/sys/btree.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,7 +72,11 @@ extern kmem_cache_t *zfs_btree_leaf_cache;

typedef struct zfs_btree_hdr {
struct zfs_btree_core *bth_parent;
boolean_t bth_core;
/*
* Set to -1 to indicate core nodes. Other values represent first
* valid element offset for leaf nodes.
*/
uint32_t bth_first;
/*
* For both leaf and core nodes, represents the number of elements in
* the node. For core nodes, they will have bth_count + 1 children.
Expand All @@ -91,9 +95,12 @@ typedef struct zfs_btree_leaf {
uint8_t btl_elems[];
} zfs_btree_leaf_t;

#define BTREE_LEAF_ESIZE (BTREE_LEAF_SIZE - \
offsetof(zfs_btree_leaf_t, btl_elems))

typedef struct zfs_btree_index {
zfs_btree_hdr_t *bti_node;
uint64_t bti_offset;
uint32_t bti_offset;
/*
* True if the location is before the list offset, false if it's at
* the listed offset.
Expand All @@ -105,6 +112,7 @@ typedef struct btree {
zfs_btree_hdr_t *bt_root;
int64_t bt_height;
size_t bt_elem_size;
uint32_t bt_leaf_cap;
uint64_t bt_num_elems;
uint64_t bt_num_nodes;
zfs_btree_leaf_t *bt_bulk; // non-null if bulk loading
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