From: David Howells Subject: Re: [PATCH 4/6] xstat: NFS: Return extended attributes Date: Thu, 26 Apr 2012 14:52:40 +0100 Message-ID: <19094.1335448360@redhat.com> References: <1334846149.21419.22.camel@lade.trondhjem.org> <20120419140558.17272.74360.stgit@warthog.procyon.org.uk> <20120419140653.17272.95035.stgit@warthog.procyon.org.uk> Cc: dhowells@redhat.com, "linux-fsdevel@vger.kernel.org" , "linux-nfs@vger.kernel.org" , "linux-cifs@vger.kernel.org" , "samba-technical@lists.samba.org" , "linux-ext4@vger.kernel.org" , "wine-devel@winehq.org" , "kfm-devel@kde.org" , "nautilus-list@gnome.org" , "linux-api@vger.kernel.org" , "libc-alpha@sourceware.org" To: "Myklebust, Trond" Return-path: In-Reply-To: <1334846149.21419.22.camel@lade.trondhjem.org> List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org List-Id: linux-ext4.vger.kernel.org Myklebust, Trond wrote: > Hmm... As far as I can see you are still doing an nfs_revalidate_inode() > in the non-forced case. That will cause expired attributes to be > retrieved from the server. Revalidation is only done when you force it or explicitly ask for a basic stat or the data version number: - if (need_atime) - err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); - else - err = nfs_revalidate_inode(NFS_SERVER(inode), inode); - if (!err) { - generic_fillattr(inode, stat); - stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); + if (force || stat->request_mask & (XSTAT_BASIC_STATS | XSTAT_VERSION)) { + if (force || need_atime) + err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); + else + err = nfs_revalidate_inode(NFS_SERVER(inode), inode); + if (err) + goto out; Unfortunately, I think I have to revalidate if any of XSTAT_BASIC_STATS are requested to maintain compatibility with stat() so that stat() can be done with xstat(). On the other hand, stat() could be done by userspace with xstat() and AT_FORCE_ATTR_SYNC, I suppose. David