bcache: Track dirty data by stripe

To make background writeback aware of raid5/6 stripes, we first need to
track the amount of dirty data within each stripe - we do this by
breaking up the existing sectors_dirty into per stripe atomic_ts

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

1 files changed, 4 insertions, 6 deletions

diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index d099d8894c2f..dbddef0cdb59 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -437,7 +437,10 @@ struct bcache_device {
         /* If nonzero, we're detaching/unregistering from cache set */
         atomic_t                detaching;
 
-        atomic_long_t           sectors_dirty;
+        uint64_t                nr_stripes;
+        unsigned                stripe_size_bits;
+        atomic_t                *stripe_sectors_dirty;
+
         unsigned long           sectors_dirty_last;
         long                    sectors_dirty_derivative;
 
@@ -1159,9 +1162,6 @@ static inline void wake_up_allocators(struct cache_set *c)
 
 /* Forward declarations */
 
-void bch_writeback_queue(struct cached_dev *);
-void bch_writeback_add(struct cached_dev *, unsigned);
-
 void bch_count_io_errors(struct cache *, int, const char *);
 void bch_bbio_count_io_errors(struct cache_set *, struct bio *,
                               int, const char *);
@@ -1224,8 +1224,6 @@ void bch_cache_set_stop(struct cache_set *);
 struct cache_set *bch_cache_set_alloc(struct cache_sb *);
 void bch_btree_cache_free(struct cache_set *);
 int bch_btree_cache_alloc(struct cache_set *);
-void bch_sectors_dirty_init(struct cached_dev *);
-void bch_cached_dev_writeback_init(struct cached_dev *);
 void bch_moving_init_cache_set(struct cache_set *);
 
 int bch_cache_allocator_start(struct cache *ca);