From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.73 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794192726; b=yTIz3vWvHnLoKi+4/hq8jA4KkxZRUFV2TS/sQoAwURzA5kHb3Mo9mSYTva4Y4h4muRF0 DXD7MJFw3Js2OkzBnHFHqDlwTGBUEappuCvwAYYGRJPRi1c718uDgpI5Bhy9WavkJ0EoJ wf3pm50NmDjO6HjmXFu7cHoCSxJJEPDPN/OWwijqdKQteuMx4Y8toYep9AeMZthoBdcEE RfvGdmt0lnx0eajtFKZwLSH5f0PdUCCA8bPjOGVQu7kseOc3aNbVwfEU4rDSz8bdH15gs 2/jf65iTimvi/nYoc+6ushxdXxx5cyTJ0kPK5kmdkNIidGd/03tkTkrZp0YdVYC151A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794192726; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; bh=nWqWiduDQX/+eDY/lBNMvXq4xgQ2WR9If/niokbocYQ=; b=kfRWTLd5OlssAp4mo6N5wOYAlbQLWaNB52/nxWKA/l2l4ZoPtm1DoUlkoQV9K3uJVbiC 2F6symmWQYs8uGtaGiWHym8Z83iSjpzVFgyNK3WQT/9V8Cuw0e9MKeuvtALrEEFsI+MrE LLiwp3v+raUrZs18XdYjrCO/iGtu2D90J0ffLISKYOeLOyCcqKnbEBobbZdX07hLZCnaj 31WyEcozDEcF0jVRJWRiYSWPH56PFpj6ntbCfQKXDso64vHk7Bqzz6fS5nohc3Tm/NtJ4 luYZxiiQCpuH5Z+AggYTcJlEj65+VchPYbXIQ30DoB+l6vVD0lXPfkQFBXoHGn7Nwxg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=pKqbz5+1; arc=none smtp.remote-ip=95.215.58.73 Received: from mta1.migadu.com (out-73.mta1.migadu.com [95.215.58.73]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B7E1606A321 for ; Mon, 9 Nov 2026 02:52:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 9B7E1606A321 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=pKqbz5+1 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=1zQrA1miKQ/sO3U4FLD9eN7ND1EAn4eFHq58nFmS/2c=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794192722; v=1; x=1794797522; b=pKqbz5+1nAKvoDjratDGIzCVYLRnYWqr1KkI/51AbwTsIOLh1H3KSkwjZnitIUapDrfX3moK iBDOjWlEa0LcAglhZ0IIVJXQpa10JvLhgoeorLL1bBrmrzYqTSk7F/F73Ux8tJumFsmES18Q1nY WVU2IQ4+YlREcEp/U62zWKW0= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id f8a5242679d67f97; Mon, 09 Nov 2026 02:52:02 +0000 X-Mizu-Trace-ID: f8a5242679d67f97 X-Migadu-Flow: FLOW_OUT Message-ID: <3f45a5f9-9c87-420d-b6a5-6145c834c0d1@linux.dev> Date: Mon, 9 Nov 2026 10:51:46 +0800 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 1/6] block: refuse a dma-buf bio that carries a crypto context To: Christoph Hellwig Cc: Jens Axboe , Dan Williams , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , tytso@mit.edu, Andreas Dilger , Baokun Li , Ojaswin Mujoo , "Ritesh Harjani (IBM)" , Zhang Yi , "Darrick J. Wong" , Andrew Morton , asml.silence@gmail.com, Anuj Gupta , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, Li Wang References: <20261105065847.196540-1-mengmeng.zhao@linux.dev> <20261105065847.196540-2-mengmeng.zhao@linux.dev> <20261106104119.GA5668@lst.de> From: Mengmeng Zhao In-Reply-To: <20261106104119.GA5668@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/6/26 18:41, Christoph Hellwig wrote: > On Thu, Nov 05, 2026 at 02:58:42PM +0800, Mengmeng Zhao wrote: >> + /* a dma-buf bio has no pages for integrity work or contents crypto */ >> if (unlikely(op_is_dmabuf(bio->bi_opf) && >> - bdev_has_integrity_csum(bio->bi_bdev))) { >> + (bdev_has_integrity_csum(bio->bi_bdev) || >> + bio_has_crypt_ctx(bio)))) { > > This could really use a factored helper explaining all the refusals. > And maybe we should use the chance to sit back and think what else > would blow up and add it there as well. > Hi Christoph, thanks for the review. I will extract a helper in V2 soon. There are several buffered io fallbacks, it's really necessary to discuss how to avoid these. Glad to join it.