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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-fsdevel@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