[PATCH 2/7] bcachefs: bucket_pos_to_bp_end()

[Kent Overstreet <kent.overstreet@linux.dev>]

Better helpers for iterating over backpointers within a specific bucket

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 fs/bcachefs/backpointers.h | 10 ++++++++++
 fs/bcachefs/ec.c           |  5 +++--
 fs/bcachefs/move.c         |  5 ++---
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/bcachefs/backpointers.h b/fs/bcachefs/backpointers.h
index eda3a78a5e2b..595db7960939 100644
--- a/fs/bcachefs/backpointers.h
+++ b/fs/bcachefs/backpointers.h
@@ -80,6 +80,16 @@ static inline struct bpos bucket_pos_to_bp(const struct bch_dev *ca,
 	return ret;
 }
 
+static inline struct bpos bucket_pos_to_bp_start(const struct bch_dev *ca, struct bpos bucket)
+{
+	return bucket_pos_to_bp(ca, bucket, 0);
+}
+
+static inline struct bpos bucket_pos_to_bp_end(const struct bch_dev *ca, struct bpos bucket)
+{
+	return bpos_nosnap_predecessor(bucket_pos_to_bp(ca, bpos_nosnap_successor(bucket), 0));
+}
+
 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *, struct bch_dev *,
 				struct bpos bucket, struct bch_backpointer, struct bkey_s_c, bool);
 
diff --git a/fs/bcachefs/ec.c b/fs/bcachefs/ec.c
index aa8ada4f0ec0..a4a2555d7c4f 100644
--- a/fs/bcachefs/ec.c
+++ b/fs/bcachefs/ec.c
@@ -1374,8 +1374,9 @@ static int ec_stripe_update_bucket(struct btree_trans *trans, struct ec_stripe_b
 
 	struct bpos bucket_pos = PTR_BUCKET_POS(ca, &ptr);
 
-	ret = for_each_btree_key_commit(trans, bp_iter, BTREE_ID_backpointers,
-			bucket_pos_to_bp(ca, bucket_pos, 0), 0, bp_k,
+	ret = for_each_btree_key_max_commit(trans, bp_iter, BTREE_ID_backpointers,
+			bucket_pos_to_bp_start(ca, bucket_pos),
+			bucket_pos_to_bp_end(ca, bucket_pos), 0, bp_k,
 			NULL, NULL,
 			BCH_TRANS_COMMIT_no_check_rw|
 			BCH_TRANS_COMMIT_no_enospc, ({
diff --git a/fs/bcachefs/move.c b/fs/bcachefs/move.c
index 88ab9d7e1a1b..8c032ef3a567 100644
--- a/fs/bcachefs/move.c
+++ b/fs/bcachefs/move.c
@@ -692,7 +692,7 @@ int bch2_evacuate_bucket(struct moving_context *ctxt,
 	bch2_trans_begin(trans);
 
 	bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
-			     bucket_pos_to_bp(ca, bucket, 0), 0);
+			     bucket_pos_to_bp_start(ca, bucket), 0);
 
 	bch_err_msg(c, ret, "looking up alloc key");
 	if (ret)
@@ -716,8 +716,7 @@ int bch2_evacuate_bucket(struct moving_context *ctxt,
 		if (ret)
 			goto err;
 
-		if (!k.k ||
-		    bkey_ge(k.k->p, bucket_pos_to_bp(ca, bpos_nosnap_successor(bucket), 0)))
+		if (!k.k || bkey_gt(k.k->p, bucket_pos_to_bp_end(ca, bucket)))
 			break;
 
 		if (k.k->type != KEY_TYPE_backpointer)
-- 
2.45.2