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bcache: Convert bucket_wait to wait_queue_head_t

Browse source 
At one point we did do fancy asynchronous waiting stuff with
bucket_wait, but that's all gone (and bucket_wait is used a lot less
than it used to be). So use the standard primitives.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet 2013-07-24 17:29:09 -07:00
parent e8e1d4682c
commit 35fcd848d7
6 changed files with 70 additions and 67 deletions
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82
drivers/md/bcache/alloc.c
View file

@ -339,7 +339,7 @@ static int bch_allocator_thread(void *arg)
allocator_wait(ca, !fifo_full(&ca->free));
fifo_push(&ca->free, bucket);
closure_wake_up(&ca->set->bucket_wait);
wake_up(&ca->set->bucket_wait);
}
/*
@ -365,16 +365,41 @@ static int bch_allocator_thread(void *arg)
}
}
long bch_bucket_alloc(struct cache *ca, unsigned watermark, struct closure *cl)
long bch_bucket_alloc(struct cache *ca, unsigned watermark, bool wait)
{
long r = -1;
again:
DEFINE_WAIT(w);
struct bucket *b;
long r;
/* fastpath */
if (fifo_used(&ca->free) > ca->watermark[watermark]) {
fifo_pop(&ca->free, r);
goto out;
}
if (!wait)
return -1;
while (1) {
if (fifo_used(&ca->free) > ca->watermark[watermark]) {
fifo_pop(&ca->free, r);
break;
}
prepare_to_wait(&ca->set->bucket_wait, &w,
TASK_UNINTERRUPTIBLE);
mutex_unlock(&ca->set->bucket_lock);
schedule();
mutex_lock(&ca->set->bucket_lock);
}
finish_wait(&ca->set->bucket_wait, &w);
out:
wake_up_process(ca->alloc_thread);
if (fifo_used(&ca->free) > ca->watermark[watermark] &&
fifo_pop(&ca->free, r)) {
struct bucket *b = ca->buckets + r;
#ifdef CONFIG_BCACHE_EDEBUG
{
size_t iter;
long i;
@ -387,36 +412,23 @@ long bch_bucket_alloc(struct cache *ca, unsigned watermark, struct closure *cl)
BUG_ON(i == r);
fifo_for_each(i, &ca->unused, iter)
BUG_ON(i == r);
}
#endif
BUG_ON(atomic_read(&b->pin) != 1);
b = ca->buckets + r;
SET_GC_SECTORS_USED(b, ca->sb.bucket_size);
BUG_ON(atomic_read(&b->pin) != 1);
if (watermark <= WATERMARK_METADATA) {
SET_GC_MARK(b, GC_MARK_METADATA);
b->prio = BTREE_PRIO;
} else {
SET_GC_MARK(b, GC_MARK_RECLAIMABLE);
b->prio = INITIAL_PRIO;
}
SET_GC_SECTORS_USED(b, ca->sb.bucket_size);
return r;
if (watermark <= WATERMARK_METADATA) {
SET_GC_MARK(b, GC_MARK_METADATA);
b->prio = BTREE_PRIO;
} else {
SET_GC_MARK(b, GC_MARK_RECLAIMABLE);
b->prio = INITIAL_PRIO;
}
trace_bcache_alloc_fail(ca);
if (cl) {
closure_wait(&ca->set->bucket_wait, cl);
if (closure_blocking(cl)) {
mutex_unlock(&ca->set->bucket_lock);
closure_sync(cl);
mutex_lock(&ca->set->bucket_lock);
goto again;
}
}
return -1;
return r;
}
void bch_bucket_free(struct cache_set *c, struct bkey *k)
@ -433,7 +445,7 @@ void bch_bucket_free(struct cache_set *c, struct bkey *k)
}
int __bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
struct bkey *k, int n, struct closure *cl)
struct bkey *k, int n, bool wait)
{
int i;
@ -446,7 +458,7 @@ int __bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
for (i = 0; i < n; i++) {
struct cache *ca = c->cache_by_alloc[i];
long b = bch_bucket_alloc(ca, watermark, cl);
long b = bch_bucket_alloc(ca, watermark, wait);
if (b == -1)
goto err;
@ -466,11 +478,11 @@ int __bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
}
int bch_bucket_alloc_set(struct cache_set *c, unsigned watermark,
struct bkey *k, int n, struct closure *cl)
struct bkey *k, int n, bool wait)
{
int ret;
mutex_lock(&c->bucket_lock);
ret = __bch_bucket_alloc_set(c, watermark, k, n, cl);
ret = __bch_bucket_alloc_set(c, watermark, k, n, wait);
mutex_unlock(&c->bucket_lock);
return ret;
}

8
drivers/md/bcache/bcache.h
View file

@ -750,7 +750,7 @@ struct cache_set {
* written.
*/
atomic_t prio_blocked;
struct closure_waitlist bucket_wait;
wait_queue_head_t bucket_wait;
/*
* For any bio we don't skip we subtract the number of sectors from
@ -1162,13 +1162,13 @@ uint8_t bch_inc_gen(struct cache *, struct bucket *);
void bch_rescale_priorities(struct cache_set *, int);
bool bch_bucket_add_unused(struct cache *, struct bucket *);
long bch_bucket_alloc(struct cache *, unsigned, struct closure *);
long bch_bucket_alloc(struct cache *, unsigned, bool);
void bch_bucket_free(struct cache_set *, struct bkey *);
int __bch_bucket_alloc_set(struct cache_set *, unsigned,
struct bkey *, int, struct closure *);
struct bkey *, int, bool);
int bch_bucket_alloc_set(struct cache_set *, unsigned,
struct bkey *, int, struct closure *);
struct bkey *, int, bool);
__printf(2, 3)
bool bch_cache_set_error(struct cache_set *, const char *, ...);

25
drivers/md/bcache/btree.c
View file

@ -813,7 +813,7 @@ static struct btree *mca_cannibalize(struct cache_set *c, struct bkey *k)
* cannibalize_bucket() will take. This means every time we unlock the root of
* the btree, we need to release this lock if we have it held.
*/
void bch_cannibalize_unlock(struct cache_set *c, struct closure *cl)
void bch_cannibalize_unlock(struct cache_set *c)
{
if (c->try_harder == current) {
bch_time_stats_update(&c->try_harder_time, c->try_harder_start);
@ -995,15 +995,14 @@ static void btree_node_free(struct btree *b)
mutex_unlock(&b->c->bucket_lock);
}
struct btree *bch_btree_node_alloc(struct cache_set *c, int level,
struct closure *cl)
struct btree *bch_btree_node_alloc(struct cache_set *c, int level)
{
BKEY_PADDED(key) k;
struct btree *b = ERR_PTR(-EAGAIN);
mutex_lock(&c->bucket_lock);
retry:
if (__bch_bucket_alloc_set(c, WATERMARK_METADATA, &k.key, 1, cl))
if (__bch_bucket_alloc_set(c, WATERMARK_METADATA, &k.key, 1, true))
goto err;
SET_KEY_SIZE(&k.key, c->btree_pages * PAGE_SECTORS);
@ -1036,10 +1035,9 @@ struct btree *bch_btree_node_alloc(struct cache_set *c, int level,
return b;
}
static struct btree *btree_node_alloc_replacement(struct btree *b,
struct closure *cl)
static struct btree *btree_node_alloc_replacement(struct btree *b)
{
struct btree *n = bch_btree_node_alloc(b->c, b->level, cl);
struct btree *n = bch_btree_node_alloc(b->c, b->level);
if (!IS_ERR_OR_NULL(n))
bch_btree_sort_into(b, n);
@ -1152,7 +1150,7 @@ static struct btree *btree_gc_alloc(struct btree *b, struct bkey *k)
* bch_bucket_alloc_set(), or we'd risk deadlock - so we don't pass it
* our closure.
*/
struct btree *n = btree_node_alloc_replacement(b, NULL);
struct btree *n = btree_node_alloc_replacement(b);
if (!IS_ERR_OR_NULL(n)) {
swap(b, n);
@ -1359,7 +1357,7 @@ static int bch_btree_gc_root(struct btree *b, struct btree_op *op,
int ret = 0, stale = btree_gc_mark_node(b, &keys, gc);
if (b->level || stale > 10)
n = btree_node_alloc_replacement(b, NULL);
n = btree_node_alloc_replacement(b);
if (!IS_ERR_OR_NULL(n))
swap(b, n);
@ -1882,10 +1880,7 @@ static int btree_split(struct btree *b, struct btree_op *op,
struct btree *n1, *n2 = NULL, *n3 = NULL;
uint64_t start_time = local_clock();
if (b->level)
set_closure_blocking(&op->cl);
n1 = btree_node_alloc_replacement(b, &op->cl);
n1 = btree_node_alloc_replacement(b);
if (IS_ERR(n1))
goto err;
@ -1896,12 +1891,12 @@ static int btree_split(struct btree *b, struct btree_op *op,
trace_bcache_btree_node_split(b, n1->sets[0].data->keys);
n2 = bch_btree_node_alloc(b->c, b->level, &op->cl);
n2 = bch_btree_node_alloc(b->c, b->level);
if (IS_ERR(n2))
goto err_free1;
if (!b->parent) {
n3 = bch_btree_node_alloc(b->c, b->level + 1, &op->cl);
n3 = bch_btree_node_alloc(b->c, b->level + 1);
if (IS_ERR(n3))
goto err_free2;
}

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

@ -355,7 +355,7 @@ static inline void rw_unlock(bool w, struct btree *b)
_r = bch_btree_ ## fn(_b, op, ##__VA_ARGS__); \
} \
rw_unlock(_w, _b); \
bch_cannibalize_unlock(c, &(op)->cl); \
bch_cannibalize_unlock(c); \
if (_r == -ENOSPC) { \
wait_event((c)->try_wait, \
!(c)->try_harder); \
@ -377,9 +377,9 @@ static inline bool should_split(struct btree *b)
void bch_btree_node_read(struct btree *);
void bch_btree_node_write(struct btree *, struct closure *);
void bch_cannibalize_unlock(struct cache_set *, struct closure *);
void bch_cannibalize_unlock(struct cache_set *);
void bch_btree_set_root(struct btree *);
struct btree *bch_btree_node_alloc(struct cache_set *, int, struct closure *);
struct btree *bch_btree_node_alloc(struct cache_set *, int);
struct btree *bch_btree_node_get(struct cache_set *, struct bkey *, int, bool);
int bch_btree_insert_check_key(struct btree *, struct btree_op *,

9
drivers/md/bcache/request.c
View file

@ -350,14 +350,8 @@ static bool bch_alloc_sectors(struct bkey *k, unsigned sectors,
struct cache_set *c = s->op.c;
struct open_bucket *b;
BKEY_PADDED(key) alloc;
struct closure cl, *w = NULL;
unsigned i;
if (s->writeback) {
closure_init_stack(&cl);
w = &cl;
}
/*
* We might have to allocate a new bucket, which we can't do with a
* spinlock held. So if we have to allocate, we drop the lock, allocate
@ -375,7 +369,8 @@ static bool bch_alloc_sectors(struct bkey *k, unsigned sectors,
spin_unlock(&c->data_bucket_lock);
if (bch_bucket_alloc_set(c, watermark, &alloc.key, 1, w))
if (bch_bucket_alloc_set(c, watermark, &alloc.key,
1, s->writeback))
return false;
spin_lock(&c->data_bucket_lock);

7
drivers/md/bcache/super.c
View file

@ -427,7 +427,7 @@ static int __uuid_write(struct cache_set *c)
lockdep_assert_held(&bch_register_lock);
if (bch_bucket_alloc_set(c, WATERMARK_METADATA, &k.key, 1, &cl))
if (bch_bucket_alloc_set(c, WATERMARK_METADATA, &k.key, 1, true))
return 1;
SET_KEY_SIZE(&k.key, c->sb.bucket_size);
@ -565,7 +565,7 @@ void bch_prio_write(struct cache *ca)
p->magic = pset_magic(ca);
p->csum = bch_crc64(&p->magic, bucket_bytes(ca) - 8);
bucket = bch_bucket_alloc(ca, WATERMARK_PRIO, &cl);
bucket = bch_bucket_alloc(ca, WATERMARK_PRIO, true);
BUG_ON(bucket == -1);
mutex_unlock(&ca->set->bucket_lock);
@ -1439,6 +1439,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
closure_init_unlocked(&c->sb_write);
mutex_init(&c->bucket_lock);
init_waitqueue_head(&c->try_wait);
init_waitqueue_head(&c->bucket_wait);
closure_init_unlocked(&c->uuid_write);
spin_lock_init(&c->sort_time_lock);
mutex_init(&c->sort_lock);
@ -1608,7 +1609,7 @@ static void run_cache_set(struct cache_set *c)
goto err_unlock_gc;
err = "cannot allocate new btree root";
c->root = bch_btree_node_alloc(c, 0, &op.cl);
c->root = bch_btree_node_alloc(c, 0);
if (IS_ERR_OR_NULL(c->root))
goto err_unlock_gc;