From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0E56BCD98CE for ; Mon, 15 Jun 2026 06:25:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C3D916B0005; Mon, 15 Jun 2026 02:25:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BC7556B008A; Mon, 15 Jun 2026 02:25:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A8F216B008C; Mon, 15 Jun 2026 02:25:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 9409D6B0005 for ; Mon, 15 Jun 2026 02:25:18 -0400 (EDT) Received: from smtpin11.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 4103A1C444C for ; Mon, 15 Jun 2026 06:25:18 +0000 (UTC) X-FDA: 84881159916.11.7C6F73E Received: from out-179.mta0.migadu.com (out-179.mta0.migadu.com [91.218.175.179]) by imf09.hostedemail.com (Postfix) with ESMTP id 4290A140003 for ; Mon, 15 Jun 2026 06:25:16 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=packett.cool header.s=key1 header.b=ircNaqFJ; dmarc=pass (policy=quarantine) header.from=packett.cool; spf=pass (imf09.hostedemail.com: domain of val@packett.cool designates 91.218.175.179 as permitted sender) smtp.mailfrom=val@packett.cool ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1781504716; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=dIagr78v8+wu8I0zN50DJ/gAtpHtsl0YE4lvqsZn4bE=; b=dMMV56FmuW21HiIxlwRnOYZqTNB6lT6FMoSmbMpZIZuq9Nzwj/bDYGPfFbq7kzEQjR2tUY XNckFXjGdGBJ7GlZCTsfzkJMFEdhkUQZdUWnu9OJ/NgMw2t5hYf3T/uzjuayoBS9P69re0 GMMradHGeyZ+/f+KLFalqCPdE9hiCyw= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=packett.cool header.s=key1 header.b=ircNaqFJ; dmarc=pass (policy=quarantine) header.from=packett.cool; spf=pass (imf09.hostedemail.com: domain of val@packett.cool designates 91.218.175.179 as permitted sender) smtp.mailfrom=val@packett.cool ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1781504716; b=6sg3+bLP/vjApGyI5KVmA8I8oRzVA0AvyN7REDjH2oiEfyQZgq3xa7ey75H1cnH2fIQgJb 06fZye62pT3DNcGutqjoUDwwIlMGxiPcTSW5Mz95EykrJ15qdXWFH50vBfTUGU0i8iDqd9 3joEoJH7MWGsNy5OBES+cPbXjrM0jr8= Message-ID: <83f05c55-efba-4bf5-abfe-d2ab0819e904@packett.cool> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=packett.cool; s=key1; t=1781504714; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dIagr78v8+wu8I0zN50DJ/gAtpHtsl0YE4lvqsZn4bE=; b=ircNaqFJIqIbLoIQAsKyoXo4rpXEoQiRy6zyFmI9hK3HrAfkw05xW4pZqyr/gEPP8FmgQe YCMXXOF0Ojr6Ke64K6mJnYe9JlDM5n9QaPTquf4RxnS2VJebzilW8irZlVAq2ZBbu8tU3H Ym5nnlp7yvHYcIa6UVoQguJIN6I828BXaZ6Oa3MyWDm++G633gd71/V0K0NJtv18Wf3rcc TGhtZ7HAjNfT3f/melWV8TK5yeAV4SGF18G26grrndY/UhwmBAr77wIkgpV/3r4qCrE+rr yyIzP94mT15QER7XOLBnD39ifvW2hpCx+GHe19vIvRAPUfC7zO4rmCN5XEqkKQ== Date: Mon, 15 Jun 2026 03:25:04 -0300 MIME-Version: 1.0 Subject: Re: [PATCH 0/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2 To: Al Viro , Linus Torvalds Cc: Christian Brauner , Askar Safin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, netdev@vger.kernel.org, Matthew Wilcox , Jens Axboe , Christoph Hellwig , David Howells , Andrew Morton , David Hildenbrand , Pedro Falcato , Miklos Szeredi , patches@lists.linux.dev, linux-fsdevel@vger.kernel.org, Jan Kara , Steven Rostedt , Joanne Koong , fuse-devel References: <20260531010107.1953702-1-safinaskar@gmail.com> <20260601-enthusiasmus-canceln-anlehnen-0e62317a9784@brauner> <20260601173325.GH2636677@ZenIV> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Val Packett In-Reply-To: <20260601173325.GH2636677@ZenIV> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: wn6uyqknbnkz9hkxemr7yqqf7pttkpc8 X-Rspamd-Queue-Id: 4290A140003 X-HE-Tag: 1781504716-647951 X-HE-Meta: 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 nSDj5OCj bo4O0dxvghYUgwWmGo4B7QxCFHqd4C97nlGK8RoJDBcHnzmzNXPC4OxoW9RCei2BxFo+30XlLljUpIPVSHgEEogh8+Pb3RmnFIV9ndMDqdC0I0Sr9nz/bVigh78nqbuFUhu5m3plCDfoUj754mU/ME6RKzRGR5MQjvh+XlPM9SjfI9xrGXyg2hC4zgw/onN4/Z1JUAmVwMhNX7GUWlDaXWXM+cUcfK9KxaeY+eQwF6YC9l6nE8iWx1gbrtPw9XQHwwG95zgXqvZ6CyBSfnRLQxXcqT+PonUNufkPqoAdlsjvx80G08lAQ+DXNoS/UjZRmvGbeUFvM5ZXq9SLAZSokXSZcn797r9CHbmPQqTqXB6H3YfUhDumyJDmcpBBcI3xnYB7PKcth0cOavJ0TpMOZvtdCbQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, On 6/1/26 2:33 PM, Al Viro wrote: > On Mon, Jun 01, 2026 at 10:17:23AM -0700, Linus Torvalds wrote: > >> TLDR: maybe we could ghet rid of "f_op->splice_read". *That* would be >> a big simplification. > FUSE might be interesting - fuse_dev_splice_read() and its ilk. > Communications between the kernel and fuse server at least used to > seriously want that, so that would be one place to look for unhappy > userland... speaking of fuse_dev_splice……_write actually, this series has broken xdg-document-portal! https://github.com/flatpak/xdg-desktop-portal/issues/2026 Specifically what happens is that the EINVAL is returned due to oh.len != nbytes: fuse_dev_do_write: oh.len 16400 != nbytes 15526 (where 16400 == 16384 (read len) + 16, 15526 == 15510 (file len) + 16) After reverting the series, there is no error because oh.len becomes 15526 too. Thanks, ~val