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(_gateway [192.168.219.1]) by mail.free-proletariat.dpdns.org (Postfix) with ESMTPSA id 0124A4C003F; Wed, 30 Jul 2025 16:20:06 +0900 (KST) To: Qu Wenruo Cc: Johannes Thumshirn , David Sterba , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, KernelKraze Subject: Re: [PATCH 1/1] btrfs: add integer overflow protection to flush_dir_items_batch allocation - WITHDRAWN Date: Wed, 30 Jul 2025 16:20:06 +0900 Message-ID: <20250730072006.154135-1-admin@mail.free-proletariat.dpdns.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <7d3afcb3-c5b6-4510-8d11-505c1538c786@gmx.com> References: <20250730044348.133387-1-admin@mail.free-proletariat.dpdns.org> <20250730044348.133387-2-admin@mail.free-proletariat.dpdns.org> <7d3afcb3-c5b6-4510-8d11-505c1538c786@gmx.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable From: KernelKraze Hi Qu, Thank you for the detailed technical review and correction. You are absolut= ely right, and I'm withdrawing this patch. On 7/30/25 4:36 PM, Qu Wenruo wrote: > Just as Johannes said, explain this number. > And the magic number 195 won't cause any overflow anyway. > [...] > Finally, have you checked the only caller of flush_dir_items_batch()? You've identified several fundamental issues with my patch: 1. **Misunderstanding of the caller context**: I failed to properly analyze= that process_dir_items_leaf() iterates through leaf node items, where batc= h_size naturally corresponds to the number of directory entries in a leaf. 2. **Inappropriate limit**: The 195 limit would indeed cause false alerts o= n valid large directories, especially with 16K nodesize supporting 200+ dir= ectory items as you correctly calculated. 3. **Unnecessary complexity**: The integer overflow protection is not neede= d in this context where the count is bounded by filesystem structure limits= , not user input. 4. **Architecture insensitivity**: I didn't consider systems with different= page sizes where the 4K limit makes no sense. I clearly should have done more thorough analysis of the btrfs architecture= and actual usage patterns before proposing this change. Your feedback is i= nvaluable for understanding how directory logging actually works in btrfs. **This patch is hereby WITHDRAWN.** Thank you for taking the time to provide such detailed technical education.= I'll study the btrfs codebase more thoroughly before future contributions. Best regards, KernelKraze