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bcache: wait for buckets when allocating new btree root 

Tested:
- sometimes bcache_tier test would hang on startup with a failure
  to allocate the btree root -- no longer seeing this

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Slava Pestov 2014-04-21 18:23:12 -07:00 committed by Kent Overstreet
parent a664d0f05a
commit c5aa4a3157
3 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/md/bcache/btree.c
View File

@ -1060,15 +1060,15 @@ static void btree_node_free(struct btree *b)
mutex_unlock(&b->c->bucket_lock);
}
struct btree *bch_btree_node_alloc(struct cache_set *c, struct btree_op *op,
int level)
struct btree *__bch_btree_node_alloc(struct cache_set *c, struct btree_op *op,
int level, bool wait)
{
BKEY_PADDED(key) k;
struct btree *b = ERR_PTR(-EAGAIN);
mutex_lock(&c->bucket_lock);
retry:
if (__bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, op != NULL))
if (__bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, 1, wait))
goto err;
bkey_put(c, &k.key);
@ -1100,6 +1100,12 @@ err:
return b;
}
static struct btree *bch_btree_node_alloc(struct cache_set *c,
struct btree_op *op, int level)
{
return __bch_btree_node_alloc(c, op, level, op != NULL);
}
static struct btree *btree_node_alloc_replacement(struct btree *b,
struct btree_op *op)
{

3
drivers/md/bcache/btree.h
View File

@ -242,7 +242,8 @@ void __bch_btree_node_write(struct btree *, struct closure *);
void bch_btree_node_write(struct btree *, struct closure *);
void bch_btree_set_root(struct btree *);
struct btree *bch_btree_node_alloc(struct cache_set *, struct btree_op *, int);
struct btree *__bch_btree_node_alloc(struct cache_set *, struct btree_op *,
int, bool);
struct btree *bch_btree_node_get(struct cache_set *, struct btree_op *,
struct bkey *, int, bool);

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

@ -1669,7 +1669,7 @@ static void run_cache_set(struct cache_set *c)
goto err;
err = "cannot allocate new btree root";
c->root = bch_btree_node_alloc(c, NULL, 0);
c->root = __bch_btree_node_alloc(c, NULL, 0, true);
if (IS_ERR_OR_NULL(c->root))
goto err;