Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:50438 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753767Ab3JBV2l (ORCPT ); Wed, 2 Oct 2013 17:28:41 -0400 From: "J. Bruce Fields" To: Al Viro Cc: Christoph Hellwig , linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, sandeen@redhat.com, "J. Bruce Fields" Subject: [PATCH 2/2] exportfs: fix 32-bit nfsd handling of 64-bit inode numbers Date: Wed, 2 Oct 2013 17:28:14 -0400 Message-Id: <1380749295-20854-2-git-send-email-bfields@redhat.com> In-Reply-To: <1380749295-20854-1-git-send-email-bfields@redhat.com> References: <20131002210736.GA20598@fieldses.org> <1380749295-20854-1-git-send-email-bfields@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: "J. Bruce Fields" Symptoms were spurious -ENOENTs on stat of an NFS filesystem from a 32-bit NFS server exporting a very large XFS filesystem, when the server's cache is cold (so the inodes in question are not in cache). Reviewed-by: Christoph Hellwig Reported-by: Trevor Cordes Signed-off-by: J. Bruce Fields --- fs/exportfs/expfs.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 293bc2e..811831a 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -215,7 +215,7 @@ struct getdents_callback { struct dir_context ctx; char *name; /* name that was found. It already points to a buffer NAME_MAX+1 is size */ - unsigned long ino; /* the inum we are looking for */ + u64 ino; /* the inum we are looking for */ int found; /* inode matched? */ int sequence; /* sequence counter */ }; @@ -255,10 +255,10 @@ static int get_name(const struct path *path, char *name, struct dentry *child) struct inode *dir = path->dentry->d_inode; int error; struct file *file; + struct kstat stat; struct getdents_callback buffer = { .ctx.actor = filldir_one, .name = name, - .ino = child->d_inode->i_ino }; error = -ENOTDIR; @@ -268,6 +268,16 @@ static int get_name(const struct path *path, char *name, struct dentry *child) if (!dir->i_fop) goto out; /* + * inode->i_ino is unsigned long, kstat->ino is u64, so the + * former would be insufficient on 32-bit hosts when the + * filesystem supports 64-bit inode numbers. So we need to + * actually call ->getattr, not just read i_ino: + */ + error = vfs_getattr_nosec(path, &stat); + if (error) + return error; + buffer.ino = stat.ino; + /* * Open the directory ... */ file = dentry_open(path, O_RDONLY, cred); -- 1.7.9.5