From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0330C64E75 for ; Fri, 20 Nov 2020 22:39:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85F7B2242A for ; Fri, 20 Nov 2020 22:39:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728886AbgKTWjY (ORCPT ); Fri, 20 Nov 2020 17:39:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728891AbgKTWjX (ORCPT ); Fri, 20 Nov 2020 17:39:23 -0500 Received: from fieldses.org (fieldses.org [IPv6:2600:3c00:e000:2f7::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7625C061A49 for ; Fri, 20 Nov 2020 14:39:22 -0800 (PST) Received: by fieldses.org (Postfix, from userid 2815) id 3CAF76E9D; Fri, 20 Nov 2020 17:39:22 -0500 (EST) DKIM-Filter: OpenDKIM Filter v2.11.0 fieldses.org 3CAF76E9D From: "J. Bruce Fields" To: Jeff Layton Cc: Daire Byrne , Trond Myklebust , linux-cachefs , linux-nfs , "J. Bruce Fields" Subject: [PATCH 5/8] nfs: use change attribute for NFS re-exports Date: Fri, 20 Nov 2020 17:39:17 -0500 Message-Id: <1605911960-12516-5-git-send-email-bfields@redhat.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1605911960-12516-1-git-send-email-bfields@redhat.com> References: <20201120223831.GB7705@fieldses.org> <1605911960-12516-1-git-send-email-bfields@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: "J. Bruce Fields" When exporting NFS, we may as well use the real change attribute returned by the original server instead of faking up a change attribute from the ctime. Note we can't do that by setting I_VERSION--that would also turn on the logic in iversion.h which treats the lower bit specially, and that doesn't make sense for NFS. So instead we define a new export operation for filesystems like NFS that want to manage the change attribute themselves. Signed-off-by: J. Bruce Fields --- fs/nfs/export.c | 18 ++++++++++++++++++ fs/nfsd/nfsfh.h | 5 ++++- include/linux/exportfs.h | 1 + 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/fs/nfs/export.c b/fs/nfs/export.c index 3430d6891e89..0b10c5946060 100644 --- a/fs/nfs/export.c +++ b/fs/nfs/export.c @@ -167,8 +167,26 @@ nfs_get_parent(struct dentry *dentry) return parent; } +static u64 nfs_fetch_iversion(struct inode *inode) +{ + struct nfs_server *server = NFS_SERVER(inode); + + /* Is this the right call?: */ + nfs_revalidate_inode(server, inode); + /* + * Also, note we're ignoring any returned error. That seems to be + * the practice for cache consistency information elsewhere in + * the server, but I'm not sure why. + */ + if (server->nfs_client->rpc_ops->version >= 4) + return inode_peek_iversion_raw(inode); + else + return time_to_chattr(&inode->i_ctime); +} + const struct export_operations nfs_export_ops = { .encode_fh = nfs_encode_fh, .fh_to_dentry = nfs_fh_to_dentry, .get_parent = nfs_get_parent, + .fetch_iversion = nfs_fetch_iversion, }; diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h index 45bd776290d5..2656a3464c6c 100644 --- a/fs/nfsd/nfsfh.h +++ b/fs/nfsd/nfsfh.h @@ -12,6 +12,7 @@ #include #include #include +#include static inline __u32 ino_t_to_u32(ino_t ino) { @@ -259,7 +260,9 @@ fh_clear_wcc(struct svc_fh *fhp) static inline u64 nfsd4_change_attribute(struct kstat *stat, struct inode *inode) { - if (IS_I_VERSION(inode)) { + if (inode->i_sb->s_export_op->fetch_iversion) + return inode->i_sb->s_export_op->fetch_iversion(inode); + else if (IS_I_VERSION(inode)) { u64 chattr; chattr = stat->ctime.tv_sec; diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index 3ceb72b67a7a..da6f0a905b94 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -213,6 +213,7 @@ struct export_operations { bool write, u32 *device_generation); int (*commit_blocks)(struct inode *inode, struct iomap *iomaps, int nr_iomaps, struct iattr *iattr); + u64 (*fetch_iversion)(struct inode *); }; extern int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid, -- 2.28.0