From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A3B543D952F; Fri, 3 Jul 2026 14:00:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783087238; cv=none; b=L6oFSJMHtp7zqPmjVVCv0DE8orD+kf/r7IMjWr9hq9aP3oZ/AxRfW6XVnZ3eUrcq12L8TiSBCDQWv2/FyowEykCkZXVoHapozNCNF5/gt4YryH+J1fv3M8bZBv7mAEA3ZWHeNJxd0TtjKY9NOsYew/XhicwuL+7klZvfNjev2hQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783087238; c=relaxed/simple; bh=gPdrYyD19U8h5KTS1KpcvRevDkPudiPDTBpd8PPpdYA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pWWpQtqZc3I9DXl4rJk7kDIBh4dYQUyUYELS+D8Kp5ib4RNAI/OZRgEiRWSbincllibYmqesSmgUlIYuz1A2N/oaekp6sogIm9cWjKPzWJZQ4Z74W7/UKB/rHGOda107vv2e0KfhI2Y1pqGw4IIzc6N+rXt21r5i7WPWflhEWg4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=guFCZvS4; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="guFCZvS4" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1o/buuAM70ro2w2qAlzO4GrBf098Us7syxhzhfaB61o=; b=guFCZvS4BN1gP76TeAo6E6tniQ Y+eDokXVFHydQ+3Qdpyqn8BcdHR2fIdWupPIrii+HuluXb61w8g4IjyR0BlFBiEUyVJU6sgmgpRJA /ZLNf1sB1y7Ycb13cr04jl1xdHr26dMFcCz4F85hXgyYYDqtED4Rzju6P5r/klEEdxlU2oYsT8ja3 AcIA5A65mTAcK/Q8Q9iv2BpXbkyHQBB/Gw53wFNzn/FMZiBo/5Gb/rjMX1IhjOAtF3wku8Hpgepv+ aDBt1LheqQchSqB2/lUITW6ngmR1mmjfSkz7nuP3q8aottk/CXOJuq9EO/dejCZinAV2aHvrfkSpm ueyFl9Pg==; Received: from hch by bombadil.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfeRX-00000007BgZ-0iaX; Fri, 03 Jul 2026 14:00:35 +0000 Date: Fri, 3 Jul 2026 07:00:35 -0700 From: Christoph Hellwig To: Pranjal Shrivastava Cc: Christoph Hellwig , Matthew Wilcox , Trond Myklebust , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Anna Schumaker , Shivaji Kant , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 6/7] nfs: Optimize direct I/O to use folios for requests Message-ID: References: <20260616134000.2733403-1-praan@google.com> <20260616134000.2733403-7-praan@google.com> <7ee3bcfdd6126c93cbb1c219bf601182b95c10d9.camel@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Fri, Jul 03, 2026 at 12:46:58PM +0000, Pranjal Shrivastava wrote: > Do we have use-cases for a kernel user for direct I/O ? (Just curious to > know if there's something on the horizon). Plenty. Basically any storage on file driver, or storage / file system server: loop, zloop, nvmet, scsi target and nfsd ar the ones I know off by head.