bcache: Convert writeback to a kthread
This simplifies the writeback flow control quite a bit - previously, it
was conceptually two coroutines, refill_dirty() and read_dirty(). This
makes the code quite a bit more straightforward.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f89e229..b79dd5a 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1029,6 +1029,7 @@
struct cached_dev *dc = container_of(cl, struct cached_dev, disk.cl);
cancel_delayed_work_sync(&dc->writeback_rate_update);
+ kthread_stop(dc->writeback_thread);
mutex_lock(&bch_register_lock);
@@ -2006,7 +2007,6 @@
static void bcache_exit(void)
{
bch_debug_exit();
- bch_writeback_exit();
bch_request_exit();
bch_btree_exit();
if (bcache_kobj)
@@ -2039,7 +2039,6 @@
sysfs_create_files(bcache_kobj, files) ||
bch_btree_init() ||
bch_request_init() ||
- bch_writeback_init() ||
bch_debug_init(bcache_kobj))
goto err;