From: Tang Junhui <tang.junhui@xxxxxxxxxx>
Currently, when a cached device detaching from cache, writeback thread is not stopped,
and writeback_rate_update work is not canceled. For example, after bellow command:
echo 1 >/sys/block/sdb/bcache/detach
you can still see the writeback thread. Then you attach the device to the cache again,
bcache will create another writeback thread, for example, after bellow command:
echo ba0fb5cd-658a-4533-9806-6ce166d883b9 > /sys/block/sdb/bcache/attach
then you will see 2 writeback threads.
This patch stops writeback thread and cancels writeback_rate_update work when cached
device detaching from cache.
Signed-off-by: Tang Junhui <tang.junhui@xxxxxxxxxx>
---
drivers/md/bcache/super.c | 6 ++++++
1 file changed, 6 insertions(+)
mode change 100644 => 100755 drivers/md/bcache/super.c
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
old mode 100644
new mode 100755
index 8352fad..bf79892
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -891,6 +891,12 @@ static void cached_dev_detach_finish(struct work_struct *w)
BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
BUG_ON(atomic_read(&dc->count));
+ cancel_delayed_work_sync(&dc->writeback_rate_update);
+ if (!IS_ERR_OR_NULL(dc->writeback_thread)) {
+ kthread_stop(dc->writeback_thread);
+ dc->writeback_thread = NULL;
+ }
+
mutex_lock(&bch_register_lock);
memset(&dc->sb.set_uuid, 0, 16);
--
1.8.3.1
