From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f46.google.com (mail-wr1-f46.google.com [209.85.221.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 866A1344D92 for ; Thu, 25 Jun 2026 08:37:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.46 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782376634; cv=none; b=X+fIA0e3BHsXF36Q00jOEx7LXQzfkbUXjieyUPNv+KI8uYi1NzfgM8QAvGAGxoDVZkw1zQK0cKwtqnJtmBgxs23ZiEDB0yxQWOxBeTlgp1En/pwUB39Me2p0zKV0+pmLwPgl1afqFnCd+/lpxwszbwHwKsWOdrqvNlLQv7f5LI8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782376634; c=relaxed/simple; bh=vfuzqAAI4Z7JfbLKu/I0egbH5sPpHBKYRHIHNaxeamI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gH2V9XLubOUg+nuO3F2zFAY7ah7/heLBmbRcr79Q19edh/Nyks+F1vyEkic8A+OXGpFk+1LEigoBNTgIGh1tdJVYdc8qRi1y7c+cIACRe38piOx8drngSe8obHywZN22f3lSrhICKVxLLt61iiKOCghv8el+m3eHjz6DtTjZ/84= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=SY8bp4vJ; arc=none smtp.client-ip=209.85.221.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SY8bp4vJ" Received: by mail-wr1-f46.google.com with SMTP id ffacd0b85a97d-462342ac290so2364333f8f.2 for ; Thu, 25 Jun 2026 01:37:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1782376632; x=1782981432; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4Vxs0grT+d4GM87KSfFWu+blunYqTUopWsPT4iLI/6Q=; b=SY8bp4vJ76cjT0gwKLLfSbNmYwKD0fXJ2UuZWI5dUi3h5u1WOMEJ4YDKo8cnZ6hGEJ cpQKdCndXE1AnzLlhE/8gKp7lenq/s9rx0RzLaVh2asZuPgWoVTZ1h6pAmLnhoYB9YDR Awtmr/mCJwudvY6e8qBjC390B4GH6a7K4UaUNaxu/gkzBGYlnJKYvL6f5LFhpxrcYx9W SasWkRH7b+KGkyy0Oc+3PGet2f2EzR3AasepQkvpKyMqFM3TTr9lihS+UhncODRCjpzd OhUARFvI4q+VmDPchhHBaNE1BkDcdJKC81n9QrRTZTVapEbzd/ffjeoqO32LOXnGojr/ 9K1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782376632; x=1782981432; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=4Vxs0grT+d4GM87KSfFWu+blunYqTUopWsPT4iLI/6Q=; b=GQCUH7ybx0zdRPTqmNO/LWjlF02/V1hgQI3j1duV0HbJXcZd/IQGeD05E5Q3hwbK6o 3zDeSWmQheg4gzrbv4eK5Ho/wGb5mAMNgHkbiE8zX7tk39M3PQedQbYChdqaLjPVI2bg sH5vuV03fYQvdZ/sHw32JitEi4jJEcea5zBd31J9gtKICgvYlfi0zlUnlDClKPX094Vy jY1X0GSKv56fYlQxPPTT/uWuU6vk1Uo3RJ+V6dO+bbpF9ycs2KQtqmrhFKiWvILAnwue vLZnstOb3a3zoVpCITtHH8bjmhtLJMfMnidrEAl59GJfk6/FWM6goSl9S+/mApxd1YFQ UF8g== X-Gm-Message-State: AOJu0YwKKjvo3ocflDZo4EVbra6BiYJX0rudRb7wl66GD/Vl4zMtinbC jJWLsWygnXfI+9TmwfWKKufTLVZdfYM1SUa4BVEnH9JVa1ZhGm/5uhYo X-Gm-Gg: AfdE7cnxcMiwq3uObi8YnhF92k/geZvfaz4oAAZ9OG1yLpD43ctHBnZthZVDtmHfTZw km6/r+vgLchJjarcrcRuOsVR1wWiZRqNhFN6SE1Cesf5Ab5F9Vbl/++I50wfENQw9FCeRxjaIQb w6SnnQ63GnO6grAWo24WfWJRmTn0gZ5GcrK0MXFWhA63BMmzh5SANWWTde9FX/VkgCMJLpptrFt nGt+gOomHq8HucafYqx6w5zfDF1Ce6ybssr4YIXuZkEybv5B7pVseWyqw+q226vxst2brRM5UM1 9LEBHioZ0CUz/Ju7WxxUyr8TtvQpmzLiyw7ZF8oACyy5Mx5/ZUbIz1n0TwJ+bCMkZFJo/7/XjMw UchbfIybgoNqRkPdIDK1wLno/nA2BM5nT4+0b8bHkdseE4P013Fu+VmRZVRBh2jXIL/mQb842lr rJON4piLIM X-Received: by 2002:a5d:5e81:0:b0:468:4f81:5aa4 with SMTP id ffacd0b85a97d-46dc026de2bmr2181270f8f.10.1782376631864; Thu, 25 Jun 2026 01:37:11 -0700 (PDT) Received: from localhost ([212.73.77.104]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-46c221d93eesm13786367f8f.20.2026.06.25.01.37.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Jun 2026 01:37:11 -0700 (PDT) From: Askar Safin To: linux-fsdevel@vger.kernel.org, Christian Brauner , Alexander Viro , Jan Kara Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, netdev@vger.kernel.org, fuse-devel@lists.linux.dev, Linus Torvalds , Matthew Wilcox , Jens Axboe , Christoph Hellwig , David Howells , Andrew Morton , David Hildenbrand , Pedro Falcato , Miklos Szeredi , Andy Lutomirski , Collin Funk , David Laight , Stefan Metzmacher , The 8472 , Willy Tarreau , Joanne Koong , Val Packett , Andrei Vagin , patches@lists.linux.dev Subject: [PATCH v2 6/7] vmsplice: return -EINVAL for particular combination of flags Date: Thu, 25 Jun 2026 08:34:08 +0000 Message-ID: <20260625083409.3769242-7-safinaskar@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260625083409.3769242-1-safinaskar@gmail.com> References: <20260625083409.3769242-1-safinaskar@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit See comment for details. Signed-off-by: Askar Safin --- fs/read_write.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/read_write.c b/fs/read_write.c index dbd0debc2..b1f71b142 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1258,6 +1258,16 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, vec, bool non_block = (flags & SPLICE_F_NONBLOCK) || (fd_file(f)->f_flags & O_NONBLOCK); ssize_t ret; + /* + * libfuse relies on sharing vmsplice behavior. + * So we detect particular combination of flags to + * pipe2(2) and vmsplice(2) and return -EINVAL. + * This forces libfuse to fail back to non-vmsplice + * code path. + */ + if ((flags == SPLICE_F_NONBLOCK) && (fd_file(f)->f_flags & O_NONBLOCK)) + return -EINVAL; + do { pipe_lock(pipe); ret = pipe_wait_for_space(pipe, non_block); -- 2.47.3