bcachefs: New in-memory array for bucket gens

The main in-memory bucket array is going away, but we'll still need to
keep bucket generations in memory, at least for now - ptr_stale() needs
to be an efficient operation.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/bcachefs/buckets_types.h b/fs/bcachefs/buckets_types.h
index b2de2995c5e7..18bca269b750 100644
--- a/fs/bcachefs/buckets_types.h
+++ b/fs/bcachefs/buckets_types.h
@@ -52,6 +52,13 @@ struct bucket_array {
 	struct bucket		b[];
 };
 
+struct bucket_gens {
+	struct rcu_head		rcu;
+	u16			first_bucket;
+	size_t			nbuckets;
+	u8			b[];
+};
+
 struct bch_dev_usage {
 	u64			buckets_ec;
 	u64			buckets_unavailable;