From owner-freebsd-fs@freebsd.org Mon Dec 28 01:51:22 2015 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 43327A523F1 for ; Mon, 28 Dec 2015 01:51:22 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 34C101379 for ; Mon, 28 Dec 2015 01:51:22 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id tBS1pLmS079455 for ; Mon, 28 Dec 2015 01:51:22 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 194293] FUSE program freezes when seeking pos > file size Date: Mon, 28 Dec 2015 01:51:22 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.1-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: rmacklem@uoguelph.ca X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-fs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Dec 2015 01:51:22 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D194293 rmacklem@uoguelph.ca changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rmacklem@uoguelph.ca --- Comment #5 from rmacklem@uoguelph.ca --- Created attachment 164744 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D164744&action= =3Dedit patch fuse so that a WRONLY open becomes a RDWR open This patch modifies the FreeBSD Fuse fs (in sys/fs/fuse) so that it always does a RDWR open when a WRONLY open is requested. I believe this bug happens when a write of a partial block occurs when not doing DIRECT_IO. When this happens the buffer cache first reads the entire block in. Without a RDWR open, this read fails and leaves the block "stuck", making umount etc. fail. The problem I see w.r.t. this patch is that a WRONLY open will fail if the process doesn't have Read access to the file. An alternate way to patch this would be to force DIRECT_IO for WRONLY opens. Comments/opinions? Hopefully nishida@ can test this patch to determine if it fixes the problem? --=20 You are receiving this mail because: You are the assignee for the bug.=