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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet cc: dhowells@redhat.com, Christian Schoenebeck , v9fs@lists.linux.dev, netfs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] 9p: Fix O_NONBLOCK read behaviour in P9L_DIRECT mode Precedence: bulk X-Mailing-List: v9fs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-ID: <4058792.1720703979.1@warthog.procyon.org.uk> Date: Thu, 11 Jul 2024 14:19:39 +0100 Message-ID: <4058793.1720703979@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 With the 9p filesystem, in P9L_DIRECT mode, if O_NONBLOCK is set, a read should terminate after doing one piece of I/O. Fixes: 80105ed2fd27 ("9p: Use netfslib read/write_iter") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218916 Signed-off-by: David Howells cc: Eric Van Hensbergen cc: Latchesar Ionkov cc: Dominique Martinet cc: Christian Schoenebeck cc: v9fs@lists.linux.dev cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/9p/vfs_addr.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index a97ceb105cd8..b443024bf715 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -77,6 +77,10 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq) * cache won't be on server and is zeroes */ __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + if ((fid->mode & P9L_DIRECT) && + test_bit(NETFS_RREQ_NONBLOCK, &rreq->flags)) + set_bit(NETFS_RREQ_BLOCKED, &rreq->flags); + netfs_subreq_terminated(subreq, err ?: total, false); }