linux-kernel - Re: [PATCH] btrfs: fix BUG_ON condition in btrfs_cancel

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Message-Id: <20230818030239.39524-1-xiaoshoukui@gmail.com>
Date:   Thu, 17 Aug 2023 23:02:39 -0400
From:   xiaoshoukui <xiaoshoukui@...il.com>
To:     dsterba@...e.cz
Cc:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        xiaoshoukui@...il.com, xiaoshoukui@...jie.com.cn
Subject: Re: [PATCH] btrfs: fix BUG_ON condition in btrfs_cancel_balance 

> Seems that it's from times the balance was not cancellable the same way
> as now. Also it's a good time to switch the BUG_ON to an assertion or
> handle it properly.

That's the point. Canceling the balance only takes into account the normal scenarios.
Replacing the BUG ON here with an assertion would make the code cleaner.

> I'll change to to ASSERT, this is really to verify that the state
> tracking works properly.

The ASSERT and BUG ON macros have already helped us uncover many hidden issues.