Return-Path: linux-nfs-owner@vger.kernel.org Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:52918 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753443AbaA3OIn (ORCPT ); Thu, 30 Jan 2014 09:08:43 -0500 Date: Thu, 30 Jan 2014 14:08:34 +0000 From: Russell King - ARM Linux To: Trond Myklebust , linux-nfs@vger.kernel.org, Christoph Hellwig , Al Viro Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: NFS client broken in Linus' tip Message-ID: <20140130140834.GW15937@n2100.arm.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-nfs-owner@vger.kernel.org List-ID: 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; 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); -- 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".