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bcache: Add struct btree_keys

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Soon, bset.c won't need to depend on struct btree.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-12-20 17:28:16 -08:00
parent 65d45231b5
commit a85e968e66
9 changed files with 322 additions and 263 deletions
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91
drivers/md/bcache/btree.h
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@@ -113,28 +113,7 @@ struct btree_write {
int prio_blocked;
};
struct btree_keys_ops {
bool (*sort_cmp)(struct btree_iter_set,
struct btree_iter_set);
struct bkey *(*sort_fixup)(struct btree_iter *,
struct bkey *);
bool (*key_invalid)(struct btree *,
const struct bkey *);
bool (*key_bad)(struct btree *,
const struct bkey *);
bool (*key_merge)(struct btree *,
struct bkey *, struct bkey *);
/*
* Only used for deciding whether to use START_KEY(k) or just the key
* itself in a couple places
*/
bool is_extents;
};
struct btree {
const struct btree_keys_ops *ops;
/* Hottest entries first */
struct hlist_node hash;
@@ -151,17 +130,8 @@ struct btree {
unsigned long flags;
uint16_t written; /* would be nice to kill */
uint8_t level;
uint8_t nsets;
uint8_t page_order;
/*
* Set of sorted keys - the real btree node - plus a binary search tree
*
* sets[0] is special; set[0]->tree, set[0]->prev and set[0]->data point
* to the memory we have allocated for this btree node. Additionally,
* set[0]->data points to the entire btree node as it exists on disk.
*/
struct bset_tree sets[MAX_BSETS];
struct btree_keys keys;
/* For outstanding btree writes, used as a lock - protects write_idx */
struct closure io;
@@ -201,49 +171,19 @@ static inline struct btree_write *btree_prev_write(struct btree *b)
return b->writes + (btree_node_write_idx(b) ^ 1);
}
static inline struct bset_tree *bset_tree_last(struct btree *b)
{
return b->sets + b->nsets;
}
static inline struct bset *btree_bset_first(struct btree *b)
{
return b->sets->data;
return b->keys.set->data;
}
static inline struct bset *btree_bset_last(struct btree *b)
{
return bset_tree_last(b)->data;
}
static inline unsigned bset_byte_offset(struct btree *b, struct bset *i)
{
return ((size_t) i) - ((size_t) b->sets->data);
}
static inline unsigned bset_sector_offset(struct btree *b, struct bset *i)
{
return (((void *) i) - ((void *) btree_bset_first(b))) >> 9;
return bset_tree_last(&b->keys)->data;
}
static inline unsigned bset_block_offset(struct btree *b, struct bset *i)
{
return bset_sector_offset(b, i) >> b->c->block_bits;
}
static inline struct bset *write_block(struct btree *b)
{
return ((void *) b->sets[0].data) + b->written * block_bytes(b->c);
}
static inline bool bset_written(struct btree *b, struct bset_tree *t)
{
return t->data < write_block(b);
}
static inline bool bkey_written(struct btree *b, struct bkey *k)
{
return k < write_block(b)->start;
return bset_sector_offset(&b->keys, i) >> b->c->block_bits;
}
static inline void set_gc_sectors(struct cache_set *c)
@@ -251,27 +191,6 @@ static inline void set_gc_sectors(struct cache_set *c)
atomic_set(&c->sectors_to_gc, c->sb.bucket_size * c->nbuckets / 16);
}
static inline bool bch_ptr_invalid(struct btree *b, const struct bkey *k)
{
return b->ops->key_invalid(b, k);
}
static inline bool bch_ptr_bad(struct btree *b, const struct bkey *k)
{
return b->ops->key_bad(b, k);
}
/*
* Tries to merge l and r: l should be lower than r
* Returns true if we were able to merge. If we did merge, l will be the merged
* key, r will be untouched.
*/
static inline bool bch_bkey_try_merge(struct btree *b,
struct bkey *l, struct bkey *r)
{
return b->ops->key_merge ? b->ops->key_merge(b, l, r) : false;
}
void bkey_put(struct cache_set *c, struct bkey *k);
/* Looping macros */
@@ -284,7 +203,7 @@ void bkey_put(struct cache_set *c, struct bkey *k);
#define for_each_key_filter(b, k, iter, filter) \
for (bch_btree_iter_init((b), (iter), NULL); \
((k) = bch_btree_iter_next_filter((iter), b, filter));)
((k) = bch_btree_iter_next_filter((iter), &(b)->keys, filter));)
#define for_each_key(b, k, iter) \
for (bch_btree_iter_init((b), (iter), NULL); \