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bcache: Add bch_btree_keys_u64s_remaining()

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Helper function to explicitly check how much space is free in a btree node

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-11-11 19:03:54 -08:00
parent a85e968e66
commit 59158fde42
3 changed files with 31 additions and 13 deletions
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15
drivers/md/bcache/bset.h
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@@ -260,6 +260,21 @@ static inline bool btree_keys_expensive_checks(struct btree_keys *b)
#define set_blocks(i, block_bytes) \
__set_blocks(i, (i)->keys, block_bytes)
static inline size_t bch_btree_keys_u64s_remaining(struct btree_keys *b)
{
struct bset_tree *t = bset_tree_last(b);
BUG_ON((PAGE_SIZE << b->page_order) <
(bset_byte_offset(b, t->data) + set_bytes(t->data)));
if (!b->last_set_unwritten)
return 0;
return ((PAGE_SIZE << b->page_order) -
(bset_byte_offset(b, t->data) + set_bytes(t->data))) /
sizeof(u64);
}
static inline struct bset *bset_next_set(struct btree_keys *b,
unsigned block_bytes)
{