From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-113.freemail.mail.aliyun.com (out30-113.freemail.mail.aliyun.com [115.124.30.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D19B381AEF for ; Fri, 19 Jun 2026 16:32:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.113 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781886735; cv=none; b=ekKRR+rlFiamjPAg4y10lu4B+7sAYGr4fF3mBtVoBej65+A8zCReXFPAt85IqPw+RjVkE55x2EK0NWP/PyjSJdLG6g+FyZpx85rLmbXDxZNYZwmr1ew2zzTm4Sn16EWL70ycvFLPOuHzUNFvWuvGFL2vKupMnm097pnljjLdLXs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781886735; c=relaxed/simple; bh=tZRhWSFePhOewkakUnQBqu163ejmMWrf5ucs72e8mMc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=UQVmwD+jq1ewyzmwFZLKgDDIvvEpC/He99umlWBeqW1HclnbX+g43+EgPQ9n07xb1T6vf8YdV8VoGbxN/tImM0UTbd29SD5vJ9fh/cHdXMRx4x82GAF3p3pQkwPdN9HFwNdiXiJtl01goEHx5y6vSvqX6hrmpEhrpHyjDHiP6Eo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=tJChjHLI; arc=none smtp.client-ip=115.124.30.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="tJChjHLI" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1781886723; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type; bh=GQ5NCQJ48zlDZ6QI1bTvxz8N867xlcMzmYl0qy8Ug9o=; b=tJChjHLI6QFTAog5PTD8/Du6+gfVXlwDIDm9ML1bYGI/xCaMCSV+nmE178W6A+HaxiO1xcwpYHd9R8dUVAItpYtvKcrcgAXxMX8q0BvvtRVIVub44jHiaYjQIlrTqk3KgzALkZ5EWs4HUOmCDIj/7NHV1KG9580S+ghN+BEilPc= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R891e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037033178;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---0X5A7CyP_1781886721; Received: from 30.120.66.214(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0X5A7CyP_1781886721 cluster:ay36) by smtp.aliyun-inc.com; Sat, 20 Jun 2026 00:32:02 +0800 Message-ID: Date: Sat, 20 Jun 2026 00:32:01 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] erofs: complete fscache pseudo-bio once when a read is split To: Michael Bommarito Cc: Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , linux-erofs@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <20260619135800.1594811-1-michael.bommarito@gmail.com> From: Gao Xiang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2026/6/20 00:21, Michael Bommarito wrote: > On Fri, Jun 19, 2026 at 10:20 AM Gao Xiang wrote: >> fscache is already deprecated, I will remove this path >> in this or the next cycle: it's not worth to improve >> this, and bio_inc_remaining is suspicious since I never >> tend to introduce chain pseudo-bios. > > I didn't chase a POC for this one, but I can't rule out an LPE on the > or at least helpful shaping from this. > > I know it's not relevant going forward, but the UAF / double free will > live forever unless stable@ gets something. It's already _deprecate_ for almost two years: and I believe there should be more serious issues all over the kernel, why just focus on a deprecated feature? Or please provide an accurate reproducible way first so that I can play with that myself, I think I can fix it in a cleaner way. If it's really necessary, it will be fixed to the stable kernels only later, but this feature will be removed in the near future upstream instead. Thanks, Gao Xiang > > Thanks, > Mike