Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753453AbaA3ObB (ORCPT ); Thu, 30 Jan 2014 09:31:01 -0500 Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:52949 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751201AbaA3Oa7 (ORCPT ); Thu, 30 Jan 2014 09:30:59 -0500 Date: Thu, 30 Jan 2014 14:30:54 +0000 From: Russell King - ARM Linux To: Trond Myklebust Cc: linuxnfs , Christoph Hellwig , Viro Alexander , linux-arm-kernel@lists.infradead.org, Linux Kernel Mailing List Subject: Re: NFS client broken in Linus' tip Message-ID: <20140130143054.GY15937@n2100.arm.linux.org.uk> References: <20140130140834.GW15937@n2100.arm.linux.org.uk> <960A8F94-BDD4-4ED0-95EC-0D71D4AC27E7@primarydata.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <960A8F94-BDD4-4ED0-95EC-0D71D4AC27E7@primarydata.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 30, 2014 at 09:17:00AM -0500, Trond Myklebust wrote: > > On Jan 30, 2014, at 9:08, Russell King - ARM Linux wrote: > > > I just booted Linus' tip (plus a few other patches to imx-drm and imx > > code), and stumbled into this interesting scenario: > > > > # touch test > > touch: cannot touch `test': Operation not supported > > > > I also tried mkdir and mknod, all result in the same error. Hard and > > symlinks links are creatable. > > > > However, I can chmod existing files and rename them. Files can also be > > deleted, and the combination of this has left me without a /etc/mtab ! > > > > The machine is a iMX6 based ARM, running root-nfs, which was mounted via > > ubuntu's initramfs (so not using the kernel's built-in root-nfs.) > > > > /proc/mounts for the root mount gives: > > 192.168.1.123:/var/boot/ci / nfs rw,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,nolock,proto=tcp,port=2049,timeo=7,retrans=10,sec=sys,local_lock=all,addr=192.168.1.123 0 0 > > > > CONFIG_NFS_FS=y > > CONFIG_NFS_V2=y > > CONFIG_NFS_V3=y > > CONFIG_NFS_V3_ACL=y > > CONFIG_NFS_V4=y > > # CONFIG_NFS_SWAP is not set > > # CONFIG_NFS_V4_1 is not set > > CONFIG_ROOT_NFS=y > > # CONFIG_NFS_USE_LEGACY_DNS is not set > > CONFIG_NFS_USE_KERNEL_DNS=y > > # CONFIG_NFSD is not set > > CONFIG_LOCKD=y > > CONFIG_LOCKD_V4=y > > CONFIG_NFS_ACL_SUPPORT=y > > CONFIG_NFS_COMMON=y > > CONFIG_SUNRPC=y > > CONFIG_SUNRPC_GSS=y > > > > tcpdumping, I see: > > > > 13:59:51.713523 IP 192.168.1.252.1341245608 > 192.168.1.123.2049: 132 lookup fh Unknown/010007011040840000000000CC238FC8FBA0475D9D9F8356B4C44166CDC38700 "test" > > 13:59:51.714345 IP 192.168.1.123.2049 > 192.168.1.252.1341245608: reply ok 120 lookup ERROR: No such file or directory > > 13:59:51.751303 IP 192.168.1.252.797 > 192.168.1.123.nfs: . ack 3381 win 2625 > > > > which is the only NFS packet(s) I see which mention "test". > > > > and stracing touch: > > > > open("test", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK|O_LARGEFILE, 0666) = -1 EOPNOTSUPP (Operation not supported) > > utimensat(AT_FDCWD, "test", NULL, 0) = -1 ENOENT (No such file or directory) > > write(2, "touch: ", 7touch: ) = 7 > > write(2, "cannot touch `test'", 19cannot touch `test') = 19 > > write(2, ": Operation not supported", 25: Operation not supported) = 25 > > write(2, "\n", 1 > > ) = 1 > > > > I think it's down to this: > > > > commit 013cdf1088d7235da9477a2375654921d9b9ba9f > > Author: Christoph Hellwig > > Date: Fri Dec 20 05:16:53 2013 -0800 > > > > nfs: use generic posix ACL infrastructure for v3 Posix ACLs > > > > This causes a small behaviour change in that we don't bother to set > > ACLs on file creation if the mode bit can express the access permissions > > fully, and thus behaving identical to local filesystems. > > > > Signed-off-by: Christoph Hellwig > > Signed-off-by: Al Viro > > > > which adds: > > > > + status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl); > > + if (status) > > + goto out; > > Right, this should clearly not cause nfs4_proc_create to fail if it > returns EOPNOTSUPP. NFS3 :) > > into nfs3_proc_create(), but this ends up calling down into nfs3_get_acl(), > > which does this: > > > > if (!nfs_server_capable(inode, NFS_CAP_ACLS)) > > return ERR_PTR(-EOPNOTSUPP); > > Just for completeness sake: is the server you were running against supposed to support POSIX acls? The server is an old 3.1.8 kernel with this NFS config: CONFIG_NFS_FS=m CONFIG_NFS_V3=y # CONFIG_NFS_V3_ACL is not set # CONFIG_NFS_V4 is not set # CONFIG_NFS_FSCACHE is not set CONFIG_NFSD=m CONFIG_NFSD_V3=y # CONFIG_NFSD_V3_ACL is not set # CONFIG_NFSD_V4 is not set CONFIG_LOCKD=m CONFIG_LOCKD_V4=y CONFIG_NFS_COMMON=y which has worked fine with NFS clients for the last 1800 odd days... until now. -- FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up. Estimation in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad. Estimate before purchase was "up to 13.2Mbit". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/