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bcache: Add struct btree_keys 

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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2
drivers/md/bcache/bcache.h
View File

@ -679,9 +679,9 @@ struct cache_set {
unsigned error_decay;
unsigned short journal_delay_ms;
bool expensive_debug_checks;
unsigned verify:1;
unsigned key_merging_disabled:1;
unsigned expensive_debug_checks:1;
unsigned gc_always_rewrite:1;
unsigned shrinker_disabled:1;
unsigned copy_gc_enabled:1;

179
drivers/md/bcache/bset.c
View File

@ -149,33 +149,33 @@ struct bkey_float {
#define BSET_CACHELINE 128
/* Space required for the btree node keys */
static inline size_t btree_keys_bytes(struct btree *b)
static inline size_t btree_keys_bytes(struct btree_keys *b)
{
return PAGE_SIZE << b->page_order;
}
static inline size_t btree_keys_cachelines(struct btree *b)
static inline size_t btree_keys_cachelines(struct btree_keys *b)
{
return btree_keys_bytes(b) / BSET_CACHELINE;
}
/* Space required for the auxiliary search trees */
static inline size_t bset_tree_bytes(struct btree *b)
static inline size_t bset_tree_bytes(struct btree_keys *b)
{
return btree_keys_cachelines(b) * sizeof(struct bkey_float);
}
/* Space required for the prev pointers */
static inline size_t bset_prev_bytes(struct btree *b)
static inline size_t bset_prev_bytes(struct btree_keys *b)
{
return btree_keys_cachelines(b) * sizeof(uint8_t);
}
/* Memory allocation */
void bch_btree_keys_free(struct btree *b)
void bch_btree_keys_free(struct btree_keys *b)
{
struct bset_tree *t = b->sets;
struct bset_tree *t = b->set;
if (bset_prev_bytes(b) < PAGE_SIZE)
kfree(t->prev);
@ -195,10 +195,11 @@ void bch_btree_keys_free(struct btree *b)
t->tree = NULL;
t->data = NULL;
}
EXPORT_SYMBOL(bch_btree_keys_free);
int bch_btree_keys_alloc(struct btree *b, unsigned page_order, gfp_t gfp)
int bch_btree_keys_alloc(struct btree_keys *b, unsigned page_order, gfp_t gfp)
{
struct bset_tree *t = b->sets;
struct bset_tree *t = b->set;
BUG_ON(t->data);
@ -225,6 +226,29 @@ int bch_btree_keys_alloc(struct btree *b, unsigned page_order, gfp_t gfp)
bch_btree_keys_free(b);
return -ENOMEM;
}
EXPORT_SYMBOL(bch_btree_keys_alloc);
void bch_btree_keys_init(struct btree_keys *b, const struct btree_keys_ops *ops,
bool *expensive_debug_checks)
{
unsigned i;
b->ops = ops;
b->expensive_debug_checks = expensive_debug_checks;
b->nsets = 0;
b->last_set_unwritten = 0;
/* XXX: shouldn't be needed */
for (i = 0; i < MAX_BSETS; i++)
b->set[i].size = 0;
/*
* Second loop starts at 1 because b->keys[0]->data is the memory we
* allocated
*/
for (i = 1; i < MAX_BSETS; i++)
b->set[i].data = NULL;
}
EXPORT_SYMBOL(bch_btree_keys_init);
/* Binary tree stuff for auxiliary search trees */
@ -448,9 +472,9 @@ static void make_bfloat(struct bset_tree *t, unsigned j)
f->exponent = 127;
}
static void bset_alloc_tree(struct btree *b, struct bset_tree *t)
static void bset_alloc_tree(struct btree_keys *b, struct bset_tree *t)
{
if (t != b->sets) {
if (t != b->set) {
unsigned j = roundup(t[-1].size,
64 / sizeof(struct bkey_float));
@ -458,27 +482,30 @@ static void bset_alloc_tree(struct btree *b, struct bset_tree *t)
t->prev = t[-1].prev + j;
}
while (t < b->sets + MAX_BSETS)
while (t < b->set + MAX_BSETS)
t++->size = 0;
}
static void bch_bset_build_unwritten_tree(struct btree *b)
static void bch_bset_build_unwritten_tree(struct btree_keys *b)
{
struct bset_tree *t = bset_tree_last(b);
BUG_ON(b->last_set_unwritten);
b->last_set_unwritten = 1;
bset_alloc_tree(b, t);
if (t->tree != b->sets->tree + btree_keys_cachelines(b)) {
if (t->tree != b->set->tree + btree_keys_cachelines(b)) {
t->prev[0] = bkey_to_cacheline_offset(t->data->start);
t->size = 1;
}
}
void bch_bset_init_next(struct btree *b, struct bset *i, uint64_t magic)
void bch_bset_init_next(struct btree_keys *b, struct bset *i, uint64_t magic)
{
if (i != b->sets->data) {
b->sets[++b->nsets].data = i;
i->seq = b->sets->data->seq;
if (i != b->set->data) {
b->set[++b->nsets].data = i;
i->seq = b->set->data->seq;
} else
get_random_bytes(&i->seq, sizeof(uint64_t));
@ -488,18 +515,21 @@ void bch_bset_init_next(struct btree *b, struct bset *i, uint64_t magic)
bch_bset_build_unwritten_tree(b);
}
EXPORT_SYMBOL(bch_bset_init_next);
static void bset_build_written_tree(struct btree *b)
void bch_bset_build_written_tree(struct btree_keys *b)
{
struct bset_tree *t = bset_tree_last(b);
struct bkey *k = t->data->start;
unsigned j, cacheline = 1;
b->last_set_unwritten = 0;
bset_alloc_tree(b, t);
t->size = min_t(unsigned,
bkey_to_cacheline(t, bset_bkey_last(t->data)),
b->sets->tree + btree_keys_cachelines(b) - t->tree);
b->set->tree + btree_keys_cachelines(b) - t->tree);
if (t->size < 2) {
t->size = 0;
@ -532,13 +562,14 @@ static void bset_build_written_tree(struct btree *b)
j = inorder_next(j, t->size))
make_bfloat(t, j);
}
EXPORT_SYMBOL(bch_bset_build_written_tree);
void bch_bset_fix_invalidated_key(struct btree *b, struct bkey *k)
void bch_bset_fix_invalidated_key(struct btree_keys *b, struct bkey *k)
{
struct bset_tree *t;
unsigned inorder, j = 1;
for (t = b->sets; t <= bset_tree_last(b); t++)
for (t = b->set; t <= bset_tree_last(b); t++)
if (k < bset_bkey_last(t->data))
goto found_set;
@ -577,8 +608,9 @@ fix_right: do {
j = j * 2 + 1;
} while (j < t->size);
}
EXPORT_SYMBOL(bch_bset_fix_invalidated_key);
static void bch_bset_fix_lookup_table(struct btree *b,
static void bch_bset_fix_lookup_table(struct btree_keys *b,
struct bset_tree *t,
struct bkey *k)
{
@ -613,7 +645,7 @@ static void bch_bset_fix_lookup_table(struct btree *b,
}
}
if (t->size == b->sets->tree + btree_keys_cachelines(b) - t->tree)
if (t->size == b->set->tree + btree_keys_cachelines(b) - t->tree)
return;
/* Possibly add a new entry to the end of the lookup table */
@ -627,12 +659,12 @@ static void bch_bset_fix_lookup_table(struct btree *b,
}
}
void bch_bset_insert(struct btree *b, struct bkey *where,
void bch_bset_insert(struct btree_keys *b, struct bkey *where,
struct bkey *insert)
{
struct bset_tree *t = bset_tree_last(b);
BUG_ON(t->data != write_block(b));
BUG_ON(!b->last_set_unwritten);
BUG_ON(bset_byte_offset(b, t->data) +
__set_bytes(t->data, t->data->keys + bkey_u64s(insert)) >
PAGE_SIZE << b->page_order);
@ -645,20 +677,17 @@ void bch_bset_insert(struct btree *b, struct bkey *where,
bkey_copy(where, insert);
bch_bset_fix_lookup_table(b, t, where);
}
EXPORT_SYMBOL(bch_bset_insert);
struct bset_search_iter {
struct bkey *l, *r;
};
static struct bset_search_iter bset_search_write_set(struct btree *b,
struct bset_tree *t,
static struct bset_search_iter bset_search_write_set(struct bset_tree *t,
const struct bkey *search)
{
unsigned li = 0, ri = t->size;
BUG_ON(!b->nsets &&
t->size < bkey_to_cacheline(t, bset_bkey_last(t->data)));
while (li + 1 != ri) {
unsigned m = (li + ri) >> 1;
@ -674,8 +703,7 @@ static struct bset_search_iter bset_search_write_set(struct btree *b,
};
}
static struct bset_search_iter bset_search_tree(struct btree *b,
struct bset_tree *t,
static struct bset_search_iter bset_search_tree(struct bset_tree *t,
const struct bkey *search)
{
struct bkey *l, *r;
@ -759,7 +787,7 @@ struct bkey *__bch_bset_search(struct btree *b, struct bset_tree *t,
if (unlikely(!t->size)) {
i.l = t->data->start;
i.r = bset_bkey_last(t->data);
} else if (bset_written(b, t)) {
} else if (bset_written(&b->keys, t)) {
/*
* Each node in the auxiliary search tree covers a certain range
* of bits, and keys above and below the set it covers might
@ -773,12 +801,16 @@ struct bkey *__bch_bset_search(struct btree *b, struct bset_tree *t,
if (unlikely(bkey_cmp(search, t->data->start) < 0))
return t->data->start;
i = bset_search_tree(b, t, search);
} else
i = bset_search_write_set(b, t, search);
i = bset_search_tree(t, search);
} else {
BUG_ON(!b->keys.nsets &&
t->size < bkey_to_cacheline(t, bset_bkey_last(t->data)));
i = bset_search_write_set(t, search);
}
if (expensive_debug_checks(b->c)) {
BUG_ON(bset_written(b, t) &&
BUG_ON(bset_written(&b->keys, t) &&
i.l != t->data->start &&
bkey_cmp(tree_to_prev_bkey(t,
inorder_to_tree(bkey_to_cacheline(t, i.l), t)),
@ -794,6 +826,7 @@ struct bkey *__bch_bset_search(struct btree *b, struct bset_tree *t,
return i.l;
}
EXPORT_SYMBOL(__bch_bset_search);
/* Btree iterator */
@ -833,7 +866,7 @@ static struct bkey *__bch_btree_iter_init(struct btree *b,
iter->b = b;
#endif
for (; start <= &b->sets[b->nsets]; start++) {
for (; start <= bset_tree_last(&b->keys); start++) {
ret = bch_bset_search(b, start, search);
bch_btree_iter_push(iter, ret, bset_bkey_last(start->data));
}
@ -845,8 +878,9 @@ struct bkey *bch_btree_iter_init(struct btree *b,
struct btree_iter *iter,
struct bkey *search)
{
return __bch_btree_iter_init(b, iter, search, b->sets);
return __bch_btree_iter_init(b, iter, search, b->keys.set);
}
EXPORT_SYMBOL(bch_btree_iter_init);
static inline struct bkey *__bch_btree_iter_next(struct btree_iter *iter,
btree_iter_cmp_fn *cmp)
@ -879,9 +913,10 @@ struct bkey *bch_btree_iter_next(struct btree_iter *iter)
return __bch_btree_iter_next(iter, btree_iter_cmp);
}
EXPORT_SYMBOL(bch_btree_iter_next);
struct bkey *bch_btree_iter_next_filter(struct btree_iter *iter,
struct btree *b, ptr_filter_fn fn)
struct btree_keys *b, ptr_filter_fn fn)
{
struct bkey *ret;
@ -913,15 +948,16 @@ int bch_bset_sort_state_init(struct bset_sort_state *state, unsigned page_order)
return 0;
}
EXPORT_SYMBOL(bch_bset_sort_state_init);
static void btree_mergesort(struct btree *b, struct bset *out,
static void btree_mergesort(struct btree_keys *b, struct bset *out,
struct btree_iter *iter,
bool fixup, bool remove_stale)
{
int i;
struct bkey *k, *last = NULL;
BKEY_PADDED(k) tmp;
bool (*bad)(struct btree *, const struct bkey *) = remove_stale
bool (*bad)(struct btree_keys *, const struct bkey *) = remove_stale
? bch_ptr_bad
: bch_ptr_invalid;
@ -955,7 +991,7 @@ static void btree_mergesort(struct btree *b, struct bset *out,
pr_debug("sorted %i keys", out->keys);
}
static void __btree_sort(struct btree *b, struct btree_iter *iter,
static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
unsigned start, unsigned order, bool fixup,
struct bset_sort_state *state)
{
@ -968,7 +1004,7 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
out = page_address(mempool_alloc(state->pool, GFP_NOIO));
used_mempool = true;
order = ilog2(bucket_pages(b->c));
order = state->page_order;
}
start_time = local_clock();
@ -983,13 +1019,13 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
* memcpy()
*/
out->magic = bset_magic(&b->c->sb);
out->seq = b->sets[0].data->seq;
out->version = b->sets[0].data->version;
swap(out, b->sets[0].data);
out->magic = b->set->data->magic;
out->seq = b->set->data->seq;
out->version = b->set->data->version;
swap(out, b->set->data);
} else {
b->sets[start].data->keys = out->keys;
memcpy(b->sets[start].data->start, out->start,
b->set[start].data->keys = out->keys;
memcpy(b->set[start].data->start, out->start,
(void *) bset_bkey_last(out) - (void *) out->start);
}
@ -998,7 +1034,7 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
else
free_pages((unsigned long) out, order);
bset_build_written_tree(b);
bch_bset_build_written_tree(b);
if (!start)
bch_time_stats_update(&state->time, start_time);
@ -1007,34 +1043,32 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter,
void bch_btree_sort_partial(struct btree *b, unsigned start,
struct bset_sort_state *state)
{
size_t order = b->page_order, keys = 0;
size_t order = b->keys.page_order, keys = 0;
struct btree_iter iter;
int oldsize = bch_count_data(b);
__bch_btree_iter_init(b, &iter, NULL, &b->sets[start]);
BUG_ON(!bset_written(b, bset_tree_last(b)) &&
(bset_tree_last(b)->size || b->nsets));
__bch_btree_iter_init(b, &iter, NULL, &b->keys.set[start]);
if (start) {
unsigned i;
for (i = start; i <= b->nsets; i++)
keys += b->sets[i].data->keys;
for (i = start; i <= b->keys.nsets; i++)
keys += b->keys.set[i].data->keys;
order = roundup_pow_of_two(__set_bytes(b->sets->data,
order = roundup_pow_of_two(__set_bytes(b->keys.set->data,
keys)) / PAGE_SIZE;
if (order)
order = ilog2(order);
}
__btree_sort(b, &iter, start, order, false, state);
__btree_sort(&b->keys, &iter, start, order, false, state);
EBUG_ON(b->written && oldsize >= 0 && bch_count_data(b) != oldsize);
}
EXPORT_SYMBOL(bch_btree_sort_partial);
void bch_btree_sort_and_fix_extents(struct btree *b, struct btree_iter *iter,
void bch_btree_sort_and_fix_extents(struct btree_keys *b,
struct btree_iter *iter,
struct bset_sort_state *state)
{
__btree_sort(b, iter, 0, b->page_order, true, state);
@ -1048,11 +1082,11 @@ void bch_btree_sort_into(struct btree *b, struct btree *new,
struct btree_iter iter;
bch_btree_iter_init(b, &iter, NULL);
btree_mergesort(b, new->sets->data, &iter, false, true);
btree_mergesort(&b->keys, new->keys.set->data, &iter, false, true);
bch_time_stats_update(&state->time, start_time);
new->sets->size = 0;
new->keys.set->size = 0; // XXX: why?
}
#define SORT_CRIT (4096 / sizeof(uint64_t))
@ -1062,28 +1096,31 @@ void bch_btree_sort_lazy(struct btree *b, struct bset_sort_state *state)
unsigned crit = SORT_CRIT;
int i;
b->keys.last_set_unwritten = 0;
/* Don't sort if nothing to do */
if (!b->nsets)
if (!b->keys.nsets)
goto out;
for (i = b->nsets - 1; i >= 0; --i) {
for (i = b->keys.nsets - 1; i >= 0; --i) {
crit *= state->crit_factor;
if (b->sets[i].data->keys < crit) {
if (b->keys.set[i].data->keys < crit) {
bch_btree_sort_partial(b, i, state);
return;
}
}
/* Sort if we'd overflow */
if (b->nsets + 1 == MAX_BSETS) {
if (b->keys.nsets + 1 == MAX_BSETS) {
bch_btree_sort(b, state);
return;
}
out:
bset_build_written_tree(b);
bch_bset_build_written_tree(&b->keys);
}
EXPORT_SYMBOL(bch_btree_sort_lazy);
/* Sysfs stuff */
@ -1102,12 +1139,12 @@ static int btree_bset_stats(struct btree_op *op, struct btree *b)
stats->nodes++;
for (i = 0; i <= b->nsets; i++) {
struct bset_tree *t = &b->sets[i];
for (i = 0; i <= b->keys.nsets; i++) {
struct bset_tree *t = &b->keys.set[i];
size_t bytes = t->data->keys * sizeof(uint64_t);
size_t j;
if (bset_written(b, t)) {
if (bset_written(&b->keys, t)) {
stats->sets_written++;
stats->bytes_written += bytes;

119
drivers/md/bcache/bset.h
View File

@ -145,6 +145,9 @@
*/
struct btree;
struct btree_keys;
struct btree_iter;
struct btree_iter_set;
struct bkey_float;
#define MAX_BSETS 4U
@ -181,6 +184,74 @@ struct bset_tree {
struct bset *data;
};
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_keys *,
const struct bkey *);
bool (*key_bad)(struct btree_keys *, const struct bkey *);
bool (*key_merge)(struct btree_keys *,
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_keys {
const struct btree_keys_ops *ops;
uint8_t page_order;
uint8_t nsets;
unsigned last_set_unwritten:1;
bool *expensive_debug_checks;
/*
* Sets of sorted keys - the real btree node - plus a binary search tree
*
* set[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 set[MAX_BSETS];
};
static inline struct bset_tree *bset_tree_last(struct btree_keys *b)
{
return b->set + b->nsets;
}
static inline bool bset_written(struct btree_keys *b, struct bset_tree *t)
{
return t <= b->set + b->nsets - b->last_set_unwritten;
}
static inline bool bkey_written(struct btree_keys *b, struct bkey *k)
{
return !b->last_set_unwritten || k < b->set[b->nsets].data->start;
}
static inline unsigned bset_byte_offset(struct btree_keys *b, struct bset *i)
{
return ((size_t) i) - ((size_t) b->set->data);
}
static inline unsigned bset_sector_offset(struct btree_keys *b, struct bset *i)
{
return bset_byte_offset(b, i) >> 9;
}
static inline bool btree_keys_expensive_checks(struct btree_keys *b)
{
#ifdef CONFIG_BCACHE_DEBUG
return *b->expensive_debug_checks;
#else
return false;
#endif
}
#define __set_bytes(i, k) (sizeof(*(i)) + (k) * sizeof(uint64_t))
#define set_bytes(i) __set_bytes(i, i->keys)
@ -189,12 +260,34 @@ struct bset_tree {
#define set_blocks(i, block_bytes) \
__set_blocks(i, (i)->keys, block_bytes)
void bch_btree_keys_free(struct btree *);
int bch_btree_keys_alloc(struct btree *, unsigned, gfp_t);
static inline struct bset *bset_next_set(struct btree_keys *b,
unsigned block_bytes)
{
struct bset *i = bset_tree_last(b)->data;
void bch_bset_fix_invalidated_key(struct btree *, struct bkey *);
void bch_bset_init_next(struct btree *, struct bset *, uint64_t);
void bch_bset_insert(struct btree *, struct bkey *, struct bkey *);
return ((void *) i) + roundup(set_bytes(i), block_bytes);
}
void bch_btree_keys_free(struct btree_keys *);
int bch_btree_keys_alloc(struct btree_keys *, unsigned, gfp_t);
void bch_btree_keys_init(struct btree_keys *, const struct btree_keys_ops *,
bool *);
void bch_bset_init_next(struct btree_keys *, struct bset *, uint64_t);
void bch_bset_build_written_tree(struct btree_keys *);
void bch_bset_fix_invalidated_key(struct btree_keys *, struct bkey *);
void bch_bset_insert(struct btree_keys *, struct bkey *, struct bkey *);
/*
* 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_keys *b,
struct bkey *l, struct bkey *r)
{
return b->ops->key_merge ? b->ops->key_merge(b, l, r) : false;
}
/* Btree key iteration */
@ -208,11 +301,11 @@ struct btree_iter {
} data[MAX_BSETS];
};
typedef bool (*ptr_filter_fn)(struct btree *, const struct bkey *);
typedef bool (*ptr_filter_fn)(struct btree_keys *, const struct bkey *);
struct bkey *bch_btree_iter_next(struct btree_iter *);
struct bkey *bch_btree_iter_next_filter(struct btree_iter *,
struct btree *, ptr_filter_fn);
struct btree_keys *, ptr_filter_fn);
void bch_btree_iter_push(struct btree_iter *, struct bkey *, struct bkey *);
struct bkey *bch_btree_iter_init(struct btree *, struct btree_iter *,
@ -246,7 +339,7 @@ int bch_bset_sort_state_init(struct bset_sort_state *, unsigned);
void bch_btree_sort_lazy(struct btree *, struct bset_sort_state *);
void bch_btree_sort_into(struct btree *, struct btree *,
struct bset_sort_state *);
void bch_btree_sort_and_fix_extents(struct btree *, struct btree_iter *,
void bch_btree_sort_and_fix_extents(struct btree_keys *, struct btree_iter *,
struct bset_sort_state *);
void bch_btree_sort_partial(struct btree *, unsigned,
struct bset_sort_state *);
@ -311,6 +404,16 @@ static inline bool bch_cut_back(const struct bkey *where, struct bkey *k)
_ret; \
})
static inline bool bch_ptr_invalid(struct btree_keys *b, const struct bkey *k)
{
return b->ops->key_invalid(b, k);
}
static inline bool bch_ptr_bad(struct btree_keys *b, const struct bkey *k)
{
return b->ops->key_bad(b, k);
}
/* Keylists */
struct keylist {

153
drivers/md/bcache/btree.c
View File

@ -107,14 +107,6 @@ enum {
static struct workqueue_struct *btree_io_wq;
static inline bool should_split(struct btree *b)
{
struct bset *i = write_block(b);
return b->written >= btree_blocks(b) ||
(b->written + __set_blocks(i, i->keys + 15, block_bytes(b->c))
> btree_blocks(b));
}
#define insert_lock(s, b) ((b)->level <= (s)->lock)
/*
@ -182,6 +174,19 @@ static inline bool should_split(struct btree *b)
_r; \
})
static inline struct bset *write_block(struct btree *b)
{
return ((void *) btree_bset_first(b)) + b->written * block_bytes(b->c);
}
static inline bool should_split(struct btree *b)
{
struct bset *i = write_block(b);
return b->written >= btree_blocks(b) ||
(b->written + __set_blocks(i, i->keys + 15, block_bytes(b->c))
> btree_blocks(b));
}
/* Btree key manipulation */
void bkey_put(struct cache_set *c, struct bkey *k)
@ -222,7 +227,7 @@ void bch_btree_node_read_done(struct btree *b)
goto err;
for (;
b->written < btree_blocks(b) && i->seq == b->sets[0].data->seq;
b->written < btree_blocks(b) && i->seq == b->keys.set[0].data->seq;
i = write_block(b)) {
err = "unsupported bset version";
if (i->version > BCACHE_BSET_VERSION)
@ -250,7 +255,7 @@ void bch_btree_node_read_done(struct btree *b)
}
err = "empty set";
if (i != b->sets[0].data && !i->keys)
if (i != b->keys.set[0].data && !i->keys)
goto err;
bch_btree_iter_push(iter, i->start, bset_bkey_last(i));
@ -260,21 +265,22 @@ void bch_btree_node_read_done(struct btree *b)
err = "corrupted btree";
for (i = write_block(b);
bset_sector_offset(b, i) < KEY_SIZE(&b->key);
bset_sector_offset(&b->keys, i) < KEY_SIZE(&b->key);
i = ((void *) i) + block_bytes(b->c))
if (i->seq == b->sets[0].data->seq)
if (i->seq == b->keys.set[0].data->seq)
goto err;
bch_btree_sort_and_fix_extents(b, iter, &b->c->sort);
bch_btree_sort_and_fix_extents(&b->keys, iter, &b->c->sort);
i = b->sets[0].data;
i = b->keys.set[0].data;
err = "short btree key";
if (b->sets[0].size &&
bkey_cmp(&b->key, &b->sets[0].end) < 0)
if (b->keys.set[0].size &&
bkey_cmp(&b->key, &b->keys.set[0].end) < 0)
goto err;
if (b->written < btree_blocks(b))
bch_bset_init_next(b, write_block(b), bset_magic(&b->c->sb));
bch_bset_init_next(&b->keys, write_block(b),
bset_magic(&b->c->sb));
out:
mempool_free(iter, b->c->fill_iter);
return;
@ -308,7 +314,7 @@ static void bch_btree_node_read(struct btree *b)
bio->bi_end_io = btree_node_read_endio;
bio->bi_private = &cl;
bch_bio_map(bio, b->sets[0].data);
bch_bio_map(bio, b->keys.set[0].data);
bch_submit_bbio(bio, b->c, &b->key, 0);
closure_sync(&cl);
@ -427,7 +433,7 @@ static void do_btree_node_write(struct btree *b)
bkey_copy(&k.key, &b->key);
SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) +
bset_sector_offset(b, i));
bset_sector_offset(&b->keys, i));
if (!bio_alloc_pages(b->bio, GFP_NOIO)) {
int j;
@ -475,12 +481,13 @@ void bch_btree_node_write(struct btree *b, struct closure *parent)
do_btree_node_write(b);
b->written += set_blocks(i, block_bytes(b->c));
atomic_long_add(set_blocks(i, block_bytes(b->c)) * b->c->sb.block_size,
&PTR_CACHE(b->c, &b->key, 0)->btree_sectors_written);
b->written += set_blocks(i, block_bytes(b->c));
/* If not a leaf node, always sort */
if (b->level && b->nsets)
if (b->level && b->keys.nsets)
bch_btree_sort(b, &b->c->sort);
else
bch_btree_sort_lazy(b, &b->c->sort);
@ -489,11 +496,12 @@ void bch_btree_node_write(struct btree *b, struct closure *parent)
* do verify if there was more than one set initially (i.e. we did a
* sort) and we sorted down to a single set:
*/
if (i != b->sets->data && !b->nsets)
if (i != b->keys.set->data && !b->keys.nsets)
bch_btree_verify(b);
if (b->written < btree_blocks(b))
bch_bset_init_next(b, write_block(b), bset_magic(&b->c->sb));
bch_bset_init_next(&b->keys, write_block(b),
bset_magic(&b->c->sb));
}
static void bch_btree_node_write_sync(struct btree *b)
@ -553,24 +561,6 @@ static void bch_btree_leaf_dirty(struct btree *b, atomic_t *journal_ref)
* mca -> memory cache
*/
static void mca_reinit(struct btree *b)
{
unsigned i;
b->flags = 0;
b->written = 0;
b->nsets = 0;
for (i = 0; i < MAX_BSETS; i++)
b->sets[i].size = 0;
/*
* Second loop starts at 1 because b->sets[0]->data is the memory we
* allocated
*/
for (i = 1; i < MAX_BSETS; i++)
b->sets[i].data = NULL;
}
#define mca_reserve(c) (((c->root && c->root->level) \
? c->root->level : 1) * 8 + 16)
#define mca_can_free(c) \
@ -580,7 +570,7 @@ static void mca_data_free(struct btree *b)
{
BUG_ON(b->io_mutex.count != 1);
bch_btree_keys_free(b);
bch_btree_keys_free(&b->keys);
b->c->bucket_cache_used--;
list_move(&b->list, &b->c->btree_cache_freed);
@ -602,7 +592,7 @@ static unsigned btree_order(struct bkey *k)
static void mca_data_alloc(struct btree *b, struct bkey *k, gfp_t gfp)
{
if (!bch_btree_keys_alloc(b,
if (!bch_btree_keys_alloc(&b->keys,
max_t(unsigned,
ilog2(b->c->btree_pages),
btree_order(k)),
@ -642,9 +632,9 @@ static int mca_reap(struct btree *b, unsigned min_order, bool flush)
if (!down_write_trylock(&b->lock))
return -ENOMEM;
BUG_ON(btree_node_dirty(b) && !b->sets[0].data);
BUG_ON(btree_node_dirty(b) && !b->keys.set[0].data);
if (b->page_order < min_order)
if (b->keys.page_order < min_order)
goto out_unlock;
if (!flush) {
@ -809,7 +799,7 @@ int bch_btree_cache_alloc(struct cache_set *c)
c->verify_data = mca_bucket_alloc(c, &ZERO_KEY, GFP_KERNEL);
if (c->verify_data &&
c->verify_data->sets[0].data)
c->verify_data->keys.set->data)
list_del_init(&c->verify_data->list);
else
c->verify_data = NULL;
@ -907,7 +897,7 @@ static struct btree *mca_alloc(struct cache_set *c, struct bkey *k, int level)
list_for_each_entry(b, &c->btree_cache_freed, list)
if (!mca_reap(b, 0, false)) {
mca_data_alloc(b, k, __GFP_NOWARN|GFP_NOIO);
if (!b->sets[0].data)
if (!b->keys.set[0].data)
goto err;
else
goto out;
@ -918,7 +908,7 @@ static struct btree *mca_alloc(struct cache_set *c, struct bkey *k, int level)
goto err;
BUG_ON(!down_write_trylock(&b->lock));
if (!b->sets->data)
if (!b->keys.set->data)
goto err;
out:
BUG_ON(b->io_mutex.count != 1);
@ -929,15 +919,17 @@ static struct btree *mca_alloc(struct cache_set *c, struct bkey *k, int level)
hlist_add_head_rcu(&b->hash, mca_hash(c, k));
lock_set_subclass(&b->lock.dep_map, level + 1, _THIS_IP_);
b->level = level;
b->parent = (void *) ~0UL;
b->flags = 0;
b->written = 0;
b->level = level;
if (!b->level)
b->ops = &bch_extent_keys_ops;
bch_btree_keys_init(&b->keys, &bch_extent_keys_ops,
&b->c->expensive_debug_checks);
else
b->ops = &bch_btree_keys_ops;
mca_reinit(b);
bch_btree_keys_init(&b->keys, &bch_btree_keys_ops,
&b->c->expensive_debug_checks);
return b;
err:
@ -998,13 +990,13 @@ struct btree *bch_btree_node_get(struct cache_set *c, struct bkey *k,
b->accessed = 1;
for (; i <= b->nsets && b->sets[i].size; i++) {
prefetch(b->sets[i].tree);
prefetch(b->sets[i].data);
for (; i <= b->keys.nsets && b->keys.set[i].size; i++) {
prefetch(b->keys.set[i].tree);
prefetch(b->keys.set[i].data);
}
for (; i <= b->nsets; i++)
prefetch(b->sets[i].data);
for (; i <= b->keys.nsets; i++)
prefetch(b->keys.set[i].data);
if (btree_node_io_error(b)) {
rw_unlock(write, b);
@ -1084,7 +1076,7 @@ struct btree *bch_btree_node_alloc(struct cache_set *c, int level, bool wait)
}
b->accessed = 1;
bch_bset_init_next(b, b->sets->data, bset_magic(&b->c->sb));
bch_bset_init_next(&b->keys, b->keys.set->data, bset_magic(&b->c->sb));
mutex_unlock(&c->bucket_lock);
@ -1215,7 +1207,7 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc)
stale = max(stale, btree_mark_key(b, k));
keys++;
if (bch_ptr_bad(b, k))
if (bch_ptr_bad(&b->keys, k))
continue;
gc->key_bytes += bkey_u64s(k);
@ -1225,9 +1217,9 @@ static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc)
gc->data += KEY_SIZE(k);
}
for (t = b->sets; t <= &b->sets[b->nsets]; t++)
for (t = b->keys.set; t <= &b->keys.set[b->keys.nsets]; t++)
btree_bug_on(t->size &&
bset_written(b, t) &&
bset_written(&b->keys, t) &&
bkey_cmp(&b->key, &t->end) < 0,
b, "found short btree key in gc");
@ -1271,7 +1263,7 @@ static int btree_gc_coalesce(struct btree *b, struct btree_op *op,
blocks = btree_default_blocks(b->c) * 2 / 3;
if (nodes < 2 ||
__set_blocks(b->sets[0].data, keys,
__set_blocks(b->keys.set[0].data, keys,
block_bytes(b->c)) > blocks * (nodes - 1))
return 0;
@ -1428,7 +1420,7 @@ static int btree_gc_recurse(struct btree *b, struct btree_op *op,
r[i].b = ERR_PTR(-EINTR);
while (1) {
k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad);
k = bch_btree_iter_next_filter(&iter, &b->keys, bch_ptr_bad);
if (k) {
r->b = bch_btree_node_get(b->c, k, b->level - 1, true);
if (IS_ERR(r->b)) {
@ -1764,7 +1756,8 @@ static int bch_btree_check_recurse(struct btree *b, struct btree_op *op,
bch_btree_iter_init(b, &iter, NULL);
do {
k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad);
k = bch_btree_iter_next_filter(&iter, &b->keys,
bch_ptr_bad);
if (k)
btree_node_prefetch(b->c, k, b->level - 1);
@ -1894,7 +1887,7 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
subtract_dirty(k, KEY_START(insert), KEY_SIZE(insert));
if (bkey_written(b, k)) {
if (bkey_written(&b->keys, k)) {
/*
* We insert a new key to cover the top of the
* old key, and the old key is modified in place
@ -1907,19 +1900,20 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
* depends on us inserting a new key for the top
* here.
*/
top = bch_bset_search(b, bset_tree_last(b),
top = bch_bset_search(b,
bset_tree_last(&b->keys),
insert);
bch_bset_insert(b, top, k);
bch_bset_insert(&b->keys, top, k);
} else {
BKEY_PADDED(key) temp;
bkey_copy(&temp.key, k);
bch_bset_insert(b, k, &temp.key);
bch_bset_insert(&b->keys, k, &temp.key);
top = bkey_next(k);
}
bch_cut_front(insert, top);
bch_cut_back(&START_KEY(insert), k);
bch_bset_fix_invalidated_key(b, k);
bch_bset_fix_invalidated_key(&b->keys, k);
return false;
}
@ -1929,7 +1923,7 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
if (bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0)
old_offset = KEY_START(insert);
if (bkey_written(b, k) &&
if (bkey_written(&b->keys, k) &&
bkey_cmp(&START_KEY(insert), &START_KEY(k)) <= 0) {
/*
* Completely overwrote, so we don't have to
@ -1938,7 +1932,7 @@ static bool fix_overlapping_extents(struct btree *b, struct bkey *insert,
bch_cut_front(k, k);
} else {
__bch_cut_back(&START_KEY(insert), k);
bch_bset_fix_invalidated_key(b, k);
bch_bset_fix_invalidated_key(&b->keys, k);
}
}
@ -1979,7 +1973,8 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
* the previous key.
*/
prev = NULL;
m = bch_btree_iter_init(b, &iter, PRECEDING_KEY(&START_KEY(k)));
m = bch_btree_iter_init(b, &iter,
PRECEDING_KEY(&START_KEY(k)));
if (fix_overlapping_extents(b, k, &iter, replace_key)) {
op->insert_collision = true;
@ -2000,7 +1995,7 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
/* prev is in the tree, if we merge we're done */
status = BTREE_INSERT_STATUS_BACK_MERGE;
if (prev &&
bch_bkey_try_merge(b, prev, k))
bch_bkey_try_merge(&b->keys, prev, k))
goto merged;
status = BTREE_INSERT_STATUS_OVERWROTE;
@ -2010,14 +2005,14 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
status = BTREE_INSERT_STATUS_FRONT_MERGE;
if (m != bset_bkey_last(i) &&
bch_bkey_try_merge(b, k, m))
bch_bkey_try_merge(&b->keys, k, m))
goto copy;
} else {
BUG_ON(replace_key);
m = bch_bset_search(b, bset_tree_last(b), k);
m = bch_bset_search(b, bset_tree_last(&b->keys), k);
}
insert: bch_bset_insert(b, m, k);
insert: bch_bset_insert(&b->keys, m, k);
copy: bkey_copy(m, k);
merged:
bch_check_keys(b, "%u for %s", status,
@ -2362,7 +2357,7 @@ static int bch_btree_map_nodes_recurse(struct btree *b, struct btree_op *op,
bch_btree_iter_init(b, &iter, from);
while ((k = bch_btree_iter_next_filter(&iter, b,
while ((k = bch_btree_iter_next_filter(&iter, &b->keys,
bch_ptr_bad))) {
ret = btree(map_nodes_recurse, k, b,
op, from, fn, flags);
@ -2395,7 +2390,7 @@ static int bch_btree_map_keys_recurse(struct btree *b, struct btree_op *op,
bch_btree_iter_init(b, &iter, from);
while ((k = bch_btree_iter_next_filter(&iter, b, bch_ptr_bad))) {
while ((k = bch_btree_iter_next_filter(&iter, &b->keys, bch_ptr_bad))) {
ret = !b->level
? fn(op, b, k)
: btree(map_keys_recurse, k, b, op, from, fn, flags);

91
drivers/md/bcache/btree.h
View File

@ -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); \

18
drivers/md/bcache/debug.c
View File

@ -113,9 +113,9 @@ static void bch_dump_bucket(struct btree *b)
unsigned i;
console_lock();
for (i = 0; i <= b->nsets; i++)
dump_bset(b, b->sets[i].data,
bset_block_offset(b, b->sets[i].data));
for (i = 0; i <= b->keys.nsets; i++)
dump_bset(b, b->keys.set[i].data,
bset_block_offset(b, b->keys.set[i].data));
console_unlock();
}
@ -139,13 +139,13 @@ void bch_btree_verify(struct btree *b)
mutex_lock(&b->c->verify_lock);
ondisk = b->c->verify_ondisk;
sorted = b->c->verify_data->sets->data;
inmemory = b->sets->data;
sorted = b->c->verify_data->keys.set->data;
inmemory = b->keys.set->data;
bkey_copy(&v->key, &b->key);
v->written = 0;
v->level = b->level;
v->ops = b->ops;
v->keys.ops = b->keys.ops;
bio = bch_bbio_alloc(b->c);
bio->bi_bdev = PTR_CACHE(b->c, &b->key, 0)->bdev;
@ -159,7 +159,7 @@ void bch_btree_verify(struct btree *b)
memcpy(ondisk, sorted, KEY_SIZE(&v->key) << 9);
bch_btree_node_read_done(v);
sorted = v->sets->data;
sorted = v->keys.set->data;
if (inmemory->keys != sorted->keys ||
memcmp(inmemory->start,
@ -264,14 +264,14 @@ void __bch_check_keys(struct btree *b, const char *fmt, ...)
if (p && bkey_cmp(&START_KEY(p), &START_KEY(k)) > 0)
goto bug;
if (bch_ptr_invalid(b, k))
if (bch_ptr_invalid(&b->keys, k))
continue;
err = "Overlapping keys";
if (p && bkey_cmp(p, &START_KEY(k)) > 0)
goto bug;
} else {
if (bch_ptr_bad(b, k))
if (bch_ptr_bad(&b->keys, k))
continue;
err = "Duplicate keys";

19
drivers/md/bcache/extents.c
View File

@ -81,8 +81,9 @@ bool __bch_btree_ptr_invalid(struct cache_set *c, const struct bkey *k)
return true;
}
static bool bch_btree_ptr_invalid(struct btree *b, const struct bkey *k)
static bool bch_btree_ptr_invalid(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
return __bch_btree_ptr_invalid(b->c, k);
}
@ -118,13 +119,14 @@ static bool btree_ptr_bad_expensive(struct btree *b, const struct bkey *k)
return true;
}
static bool bch_btree_ptr_bad(struct btree *b, const struct bkey *k)
static bool bch_btree_ptr_bad(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
unsigned i;
if (!bkey_cmp(k, &ZERO_KEY) ||
!KEY_PTRS(k) ||
bch_ptr_invalid(b, k))
bch_ptr_invalid(bk, k))
return true;
for (i = 0; i < KEY_PTRS(k); i++)
@ -209,8 +211,9 @@ static struct bkey *bch_extent_sort_fixup(struct btree_iter *iter,
return NULL;
}
static bool bch_extent_invalid(struct btree *b, const struct bkey *k)
static bool bch_extent_invalid(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
char buf[80];
if (!KEY_SIZE(k))
@ -259,13 +262,14 @@ static bool bch_extent_bad_expensive(struct btree *b, const struct bkey *k,
return true;
}
static bool bch_extent_bad(struct btree *b, const struct bkey *k)
static bool bch_extent_bad(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
struct bucket *g;
unsigned i, stale;
if (!KEY_PTRS(k) ||
bch_extent_invalid(b, k))
bch_extent_invalid(bk, k))
return true;
for (i = 0; i < KEY_PTRS(k); i++)
@ -303,8 +307,9 @@ static uint64_t merge_chksums(struct bkey *l, struct bkey *r)
~((uint64_t)1 << 63);
}
static bool bch_extent_merge(struct btree *b, struct bkey *l, struct bkey *r)
static bool bch_extent_merge(struct btree_keys *bk, struct bkey *l, struct bkey *r)
{
struct btree *b = container_of(bk, struct btree, keys);
unsigned i;
if (key_merging_disabled(b->c))

2
drivers/md/bcache/sysfs.c
View File

@ -433,7 +433,7 @@ SHOW(__bch_cache_set)
mutex_lock(&c->bucket_lock);
list_for_each_entry(b, &c->btree_cache, list)
ret += 1 << (b->page_order + PAGE_SHIFT);
ret += 1 << (b->keys.page_order + PAGE_SHIFT);
mutex_unlock(&c->bucket_lock);
return ret;

2
include/trace/events/bcache.h
View File

@ -247,7 +247,7 @@ TRACE_EVENT(bcache_btree_write,
TP_fast_assign(
__entry->bucket = PTR_BUCKET_NR(b->c, &b->key, 0);
__entry->block = b->written;
__entry->keys = b->sets[b->nsets].data->keys;
__entry->keys = b->keys.set[b->keys.nsets].data->keys;
),
TP_printk("bucket %zu", __entry->bucket)