bcachefs: Minor transaction restart handling fix

 - fsck_inode_rm() wasn't returning BCH_ERR_transaction_restart_nested
 - change bch2_trans_verify_not_restarted() to call panic() - we don't
   want these errors to be missed
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/btree_iter.c

@@ -3289,8 +3289,8 @@ u32 bch2_trans_begin(struct btree_trans *trans)
 
 void bch2_trans_verify_not_restarted(struct btree_trans *trans, u32 restart_count)
 {
-	bch2_trans_inconsistent_on(trans_was_restarted(trans, restart_count), trans,
-		"trans->restart_count %u, should be %u, last restarted by %ps\n",
+	if (trans_was_restarted(trans, restart_count))
+		panic("trans->restart_count %u, should be %u, last restarted by %pS\n",
 		      trans->restart_count, restart_count,
 		      (void *) trans->last_restarted_ip);
 }

fs/bcachefs/fsck.c

@@ -290,7 +290,7 @@ static int fsck_inode_rm(struct btree_trans *trans, u64 inum, u32 snapshot)
 	if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
 		goto retry;
 
-	return ret;
+	return ret ?: -BCH_ERR_transaction_restart_nested;
 }
 
 static int __remove_dirent(struct btree_trans *trans, struct bpos pos)
@@ -914,7 +914,7 @@ static int check_inode(struct btree_trans *trans,
 		bch2_fs_lazy_rw(c);
 
 		ret = fsck_inode_rm(trans, u.bi_inum, iter->pos.snapshot);
-		if (ret)
+		if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart))
 			bch_err(c, "error in fsck: error while deleting inode: %s",
 				bch2_err_str(ret));
 		return ret;