bcachefs: btree_iter_prev_slot()

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

diff --git a/fs/bcachefs/btree_iter.c b/fs/bcachefs/btree_iter.c
index 9d3333cd76f9c0b9d20fb83f0fa8099c5c32144d..c05bc8ff8b8d2715521491568ca02d1e58a29664 100644 (file)
--- a/fs/bcachefs/btree_iter.c
+++ b/fs/bcachefs/btree_iter.c
@@ -1904,6 +1904,14 @@ struct bkey_s_c bch2_btree_iter_next_slot(struct btree_iter *iter)
        return bch2_btree_iter_peek_slot(iter);
 }
 
+struct bkey_s_c bch2_btree_iter_prev_slot(struct btree_iter *iter)
+{
+       if (!bch2_btree_iter_rewind_pos(iter))
+               return bkey_s_c_null;
+
+       return bch2_btree_iter_peek_slot(iter);
+}
+
 struct bkey_s_c bch2_btree_iter_peek_cached(struct btree_iter *iter)
 {
        struct bkey_cached *ck;

diff --git a/fs/bcachefs/btree_iter.h b/fs/bcachefs/btree_iter.h
index e2469436f53b5ae31014c7c5b8ef6076b96553d4..3ae6c29c6dad6b529b79a37106653d8530ff693b 100644 (file)
--- a/fs/bcachefs/btree_iter.h
+++ b/fs/bcachefs/btree_iter.h
@@ -171,6 +171,7 @@ struct bkey_s_c bch2_btree_iter_prev(struct btree_iter *);
 
 struct bkey_s_c bch2_btree_iter_peek_slot(struct btree_iter *);
 struct bkey_s_c bch2_btree_iter_next_slot(struct btree_iter *);
+struct bkey_s_c bch2_btree_iter_prev_slot(struct btree_iter *);
 
 struct bkey_s_c bch2_btree_iter_peek_cached(struct btree_iter *);