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bcache: Convert btree_insert_check_key() to btree_insert_node() 

This was the main point of all this refactoring - now,
btree_insert_check_key() won't fail just because the leaf node happened
to be full.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2013-09-10 18:39:16 -07:00
parent 403b6cdeb1
commit e7c590eb63
4 changed files with 79 additions and 72 deletions
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8
drivers/md/bcache/bcache.h
View File

@ -1091,14 +1091,6 @@ do { \
for (b = (ca)->buckets + (ca)->sb.first_bucket; \
b < (ca)->buckets + (ca)->sb.nbuckets; b++)
static inline void __bkey_put(struct cache_set *c, struct bkey *k)
{
unsigned i;
for (i = 0; i < KEY_PTRS(k); i++)
atomic_dec_bug(&PTR_BUCKET(c, k, i)->pin);
}
static inline void cached_dev_put(struct cached_dev *dc)
{
if (atomic_dec_and_test(&dc->count))

82
drivers/md/bcache/btree.c
View File

@ -118,6 +118,15 @@ void bch_btree_op_init_stack(struct btree_op *op)
/* Btree key manipulation */
void __bkey_put(struct cache_set *c, struct bkey *k)
{
unsigned i;
for (i = 0; i < KEY_PTRS(k); i++)
if (ptr_available(c, k, i))
atomic_dec_bug(&PTR_BUCKET(c, k, i)->pin);
}
static void bkey_put(struct cache_set *c, struct bkey *k, int level)
{
if ((level && KEY_OFFSET(k)) || !level)
@ -1855,8 +1864,6 @@ static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op,
bool ret = false;
unsigned oldsize = bch_count_data(b);
BUG_ON(!insert_lock(op, b));
while (!bch_keylist_empty(insert_keys)) {
struct bset *i = write_block(b);
struct bkey *k = insert_keys->bottom;
@ -1898,39 +1905,6 @@ static bool bch_btree_insert_keys(struct btree *b, struct btree_op *op,
return ret;
}
bool bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
struct bio *bio)
{
bool ret = false;
uint64_t btree_ptr = b->key.ptr[0];
unsigned long seq = b->seq;
BKEY_PADDED(k) tmp;
rw_unlock(false, b);
rw_lock(true, b, b->level);
if (b->key.ptr[0] != btree_ptr ||
b->seq != seq + 1 ||
should_split(b))
goto out;
op->replace = KEY(op->inode, bio_end_sector(bio), bio_sectors(bio));
SET_KEY_PTRS(&op->replace, 1);
get_random_bytes(&op->replace.ptr[0], sizeof(uint64_t));
SET_PTR_DEV(&op->replace, 0, PTR_CHECK_DEV);
bkey_copy(&tmp.k, &op->replace);
BUG_ON(op->type != BTREE_INSERT);
BUG_ON(!btree_insert_key(b, op, &tmp.k));
ret = true;
out:
downgrade_write(&b->lock);
return ret;
}
static int btree_split(struct btree *b, struct btree_op *op,
struct keylist *insert_keys,
struct keylist *parent_keys)
@ -2097,6 +2071,44 @@ static int bch_btree_insert_node(struct btree *b, struct btree_op *op,
return ret;
}
int bch_btree_insert_check_key(struct btree *b, struct btree_op *op,
struct bkey *check_key)
{
int ret = -EINTR;
uint64_t btree_ptr = b->key.ptr[0];
unsigned long seq = b->seq;
struct keylist insert;
bool upgrade = op->lock == -1;
bch_keylist_init(&insert);
if (upgrade) {
rw_unlock(false, b);
rw_lock(true, b, b->level);
if (b->key.ptr[0] != btree_ptr ||
b->seq != seq + 1)
goto out;
}
SET_KEY_PTRS(check_key, 1);
get_random_bytes(&check_key->ptr[0], sizeof(uint64_t));
SET_PTR_DEV(check_key, 0, PTR_CHECK_DEV);
bch_keylist_add(&insert, check_key);
BUG_ON(op->type != BTREE_INSERT);
ret = bch_btree_insert_node(b, op, &insert);
BUG_ON(!ret && !bch_keylist_empty(&insert));
out:
if (upgrade)
downgrade_write(&b->lock);
return ret;
}
static int bch_btree_insert_recurse(struct btree *b, struct btree_op *op)
{
if (bch_keylist_empty(&op->keys))

6
drivers/md/bcache/btree.h
View File

@ -216,6 +216,8 @@ static inline struct bkey *bch_btree_iter_init(struct btree *b,
return __bch_btree_iter_init(b, iter, search, b->sets);
}
void __bkey_put(struct cache_set *c, struct bkey *k);
/* Looping macros */
#define for_each_cached_btree(b, c, iter) \
@ -380,8 +382,8 @@ struct btree *bch_btree_node_alloc(struct cache_set *, int, struct closure *);
struct btree *bch_btree_node_get(struct cache_set *, struct bkey *,
int, struct btree_op *);
bool bch_btree_insert_check_key(struct btree *, struct btree_op *,
struct bio *);
int bch_btree_insert_check_key(struct btree *, struct btree_op *,
struct bkey *);
int bch_btree_insert(struct btree_op *, struct cache_set *);
int bch_btree_search_recurse(struct btree *, struct btree_op *);

55
drivers/md/bcache/request.c
View File

@ -869,35 +869,39 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
struct bio *bio, unsigned sectors)
{
int ret = 0;
unsigned reada;
unsigned reada = 0;
struct cached_dev *dc = container_of(s->d, struct cached_dev, disk);
struct bio *miss;
if (s->cache_miss || s->op.skip) {
miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
if (miss == bio)
s->op.lookup_done = true;
goto out_submit;
}
if (!(bio->bi_rw & REQ_RAHEAD) &&
!(bio->bi_rw & REQ_META) &&
s->op.c->gc_stats.in_use < CUTOFF_CACHE_READA)
reada = min_t(sector_t, dc->readahead >> 9,
bdev_sectors(bio->bi_bdev) - bio_end_sector(bio));
s->cache_bio_sectors = min(sectors, bio_sectors(bio) + reada);
s->op.replace = KEY(s->op.inode, bio->bi_sector +
s->cache_bio_sectors, s->cache_bio_sectors);
ret = bch_btree_insert_check_key(b, &s->op, &s->op.replace);
if (ret)
return ret;
miss = bch_bio_split(bio, sectors, GFP_NOIO, s->d->bio_split);
if (miss == bio)
s->op.lookup_done = true;
else
/* btree_search_recurse()'s btree iterator is no good anymore */
ret = -EINTR;
miss->bi_end_io = request_endio;
miss->bi_private = &s->cl;
if (s->cache_miss || s->op.skip)
goto out_submit;
if (miss != bio ||
(bio->bi_rw & REQ_RAHEAD) ||
(bio->bi_rw & REQ_META) ||
s->op.c->gc_stats.in_use >= CUTOFF_CACHE_READA)
reada = 0;
else {
reada = min(dc->readahead >> 9,
sectors - bio_sectors(miss));
if (bio_end_sector(miss) + reada > bdev_sectors(miss->bi_bdev))
reada = bdev_sectors(miss->bi_bdev) -
bio_end_sector(miss);
}
s->cache_bio_sectors = bio_sectors(miss) + reada;
s->op.cache_bio = bio_alloc_bioset(GFP_NOWAIT,
DIV_ROUND_UP(s->cache_bio_sectors, PAGE_SECTORS),
dc->disk.bio_split);
@ -912,11 +916,6 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
s->op.cache_bio->bi_end_io = request_endio;
s->op.cache_bio->bi_private = &s->cl;
/* btree_search_recurse()'s btree iterator is no good anymore */
ret = -EINTR;
if (!bch_btree_insert_check_key(b, &s->op, s->op.cache_bio))
goto out_put;
bch_bio_map(s->op.cache_bio, NULL);
if (bio_alloc_pages(s->op.cache_bio, __GFP_NOWARN|GFP_NOIO))
goto out_put;
@ -931,6 +930,8 @@ out_put:
bio_put(s->op.cache_bio);
s->op.cache_bio = NULL;
out_submit:
miss->bi_end_io = request_endio;
miss->bi_private = &s->cl;
closure_bio_submit(miss, &s->cl, s->d);
return ret;
}