From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Biggers Subject: [BUG] fuse: request prepared before protocol version is known Date: Tue, 23 Dec 2014 11:58:03 -0600 Message-ID: <20141223175803.GA9789@zzz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mszeredi@suse.cz To: fuse-devel@lists.sourceforge.net Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org I am using Linux 3.19-rc1 and I encountered a bug where stat() would sporatically fail with EIO when called on a file in a FUSE filesystem very shortly after that filesystem has been mounted. This is a regression caused by commit 7078187a: "fuse: introduce fuse_simple_request() helper". The underlying issue is that the arguments to the FUSE request are being initialized before the protocol version (fc->minor) is known. This was not a problem with the old code because fuse_get_req() will wait until the channel has been initialized. The only potential solutions I have in mind are adding an explicit waits in all the needed places, or reverting the commit. Eric