bcache: Initialize sectors_dirty when attaching

Previously, dirty_data wouldn't get initialized until the first garbage
collection... which was a bit of a problem for background writeback (as
the PD controller keys off of it) and also confusing for users.

This is also prep work for making background writeback aware of raid5/6
stripes.

Signed-off-by: Kent Overstreet <koverstreet@google.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 3c8474161e8e..dbfa1c38e85e 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -961,6 +961,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
         atomic_set(&dc->count, 1);
 
         if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
+                bch_sectors_dirty_init(dc);
                 atomic_set(&dc->has_dirty, 1);
                 atomic_inc(&dc->count);
                 bch_writeback_queue(dc);