bcache: Move sector allocator to alloc.c

Just reorganizing things a bit.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/request.h b/drivers/md/bcache/request.h
index 54d7de2..2cd65bf 100644
--- a/drivers/md/bcache/request.h
+++ b/drivers/md/bcache/request.h
@@ -6,10 +6,10 @@
 struct data_insert_op {
 	struct closure		cl;
 	struct cache_set	*c;
-	struct task_struct	*task;
 	struct bio		*bio;
 
 	unsigned		inode;
+	uint16_t		write_point;
 	uint16_t		write_prio;
 	short			error;
 
@@ -31,9 +31,6 @@
 unsigned bch_get_congested(struct cache_set *);
 void bch_data_insert(struct closure *cl);
 
-void bch_open_buckets_free(struct cache_set *);
-int bch_open_buckets_alloc(struct cache_set *);
-
 void bch_cached_dev_request_init(struct cached_dev *dc);
 void bch_flash_dev_request_init(struct bcache_device *d);