From: Zhihao Cheng <chengzhihao1@huawei.com>
To: ZhaoLong Wang <wangzhaolong1@huawei.com>, <richard@nod.at>,
<miquel.raynal@bootlin.com>, <vigneshr@ti.com>
Cc: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
<yi.zhang@huawei.com>, <yangerkun@huawei.com>
Subject: Re: [PATCH V3] ubifs: correct UBIFS_DFS_DIR_LEN macro definition and improve code clarity
Date: Thu, 18 Apr 2024 15:11:32 +0800 [thread overview]
Message-ID: <fde03388-9673-af46-ffef-9d387605d015@huawei.com> (raw)
In-Reply-To: <20240418070704.3080590-1-wangzhaolong1@huawei.com>
在 2024/4/18 15:07, ZhaoLong Wang 写道:
> The UBIFS_DFS_DIR_LEN macro, which defines the maximum length of the UBIFS
> debugfs directory name, has an incorrect formula and misleading comments.
> The current formula is (3 + 1 + 2*2 + 1), which assumes that both UBI device
> number and volume ID are limited to 2 characters. However, UBI device number
> ranges from 0 to 31 (2 characters), and volume ID ranges from 0 to 127 (up
> to 3 characters).
>
> Although the current code works due to the cancellation of mathematical
> errors (9 + 1 = 10, which matches the correct UBIFS_DFS_DIR_LEN value), it
> can lead to confusion and potential issues in the future.
>
> This patch aims to improve the code clarity and maintainability by making
> the following changes:
>
> 1. Corrects the UBIFS_DFS_DIR_LEN macro definition to (3 + 1 + 2 + 3 + 1),
> accommodating the maximum lengths of both UBI device number and volume ID,
> plus the separators and null terminator.
> 2. Updates the snprintf calls to use UBIFS_DFS_DIR_LEN instead of
> UBIFS_DFS_DIR_LEN + 1, removing the unnecessary +1.
> 3. Modifies the error checks to compare against UBIFS_DFS_DIR_LEN using >=
> instead of >, aligning with the corrected macro definition.
> 4. Removes the redundant +1 in the dfs_dir_name array definitions in ubi.h
> and debug.h.
>
> While these changes do not affect the runtime behavior, they make the code
> more readable, maintainable, and less prone to future errors.
>
> v2->v3:
>
> - Removes the duplicated UBIFS_DFS_DIR_LEN and UBIFS_DFS_DIR_NAME macro
> definitions in ubifs.h, as they are already defined in debug.h.
>
> Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
You lost my 'review-by' in last v3.
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
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next prev parent reply other threads:[~2024-04-18 7:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-18 7:07 [PATCH V3] ubifs: correct UBIFS_DFS_DIR_LEN macro definition and improve code clarity ZhaoLong Wang
2024-04-18 7:11 ` Zhihao Cheng [this message]
-- strict thread matches above, loose matches on Subject: below --
2024-04-17 9:27 ZhaoLong Wang
2024-04-17 11:22 ` Zhihao Cheng
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