From patchwork Fri Sep 11 10:20:30 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 7159291 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id DE4279F326 for ; Fri, 11 Sep 2015 10:20:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A1E612082B for ; Fri, 11 Sep 2015 10:20:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ED078206E3 for ; Fri, 11 Sep 2015 10:20:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751491AbbIKKUj (ORCPT ); Fri, 11 Sep 2015 06:20:39 -0400 Received: from mail-yk0-f174.google.com ([209.85.160.174]:33317 "EHLO mail-yk0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751273AbbIKKUh (ORCPT ); Fri, 11 Sep 2015 06:20:37 -0400 Received: by ykei199 with SMTP id i199so86302216yke.0 for ; Fri, 11 Sep 2015 03:20:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=9i7QmCq+hiGjkvijQHVpmF+DQWZr2fY/PCRE5beC9c0=; b=WLZlNtqaXrGrHJiHSXL1f+/EmzEcDYdFf0IgYU1P4KVZtykzpS4C4GD8EVrCzU8YEX vBBxD4Ny55a3re4O7Uc34I0IbN3VC0CQT8u+1zjqwilSf1o3J7oHCPVeWPTynP210RN7 dARgYWxSwztDU1EFQHyuHZks+57sT1qb03fII9Vb9zFDHYRHkIBIYCOxJD4GyD1w3xsF u/LO/yyIDHE78TgNkUUnAKZuRSO33+fB8ENiI3S6svj+J034rEbwfbh7fHmrLdL2kto7 TxKYeMm20+rflfZKNBLCYr3kwIVgdcNneTA/xEpjf3ltOluH0qf3kY3EVOXGfs42Dx6D Qy5A== X-Gm-Message-State: ALoCoQnLBRfKK/AYoiZ2HuwFuYOoJTFEf8vgkjeg5QWrm1bSt/FofaLfIytirWeTD9hWk4uwGwg6 X-Received: by 10.170.71.85 with SMTP id n82mr49618297ykn.75.1441966836574; Fri, 11 Sep 2015 03:20:36 -0700 (PDT) Received: from tlielax.poochiereds.net ([2606:a000:1105:8e:3a60:77ff:fe93:a95d]) by smtp.googlemail.com with ESMTPSA id d204sm403086ywe.56.2015.09.11.03.20.34 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Sep 2015 03:20:35 -0700 (PDT) From: Jeff Layton X-Google-Original-From: Jeff Layton To: bfields@fieldses.org Cc: linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, HPDD-discuss@lists.01.org, ceph-devel@vger.kernel.org, cluster-devel@redhat.com, fuse-devel@lists.sourceforge.net, ocfs2-devel@oss.oracle.com Subject: [PATCH] nfsd: add a new EXPORT_OP_NOWCC flag to struct export_operations Date: Fri, 11 Sep 2015 06:20:30 -0400 Message-Id: <1441966830-5517-1-git-send-email-jeff.layton@primarydata.com> X-Mailer: git-send-email 2.4.3 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP With NFSv3 nfsd will always attempt to send along WCC data to the client. This generally involves saving off the in-core inode information prior to doing the operation on the given filehandle, and then issuing a vfs_getattr to it after the op. Some filesystems (particularly clustered or networked ones) have an expensive ->getattr inode operation. Atomicitiy is also often difficult or impossible to guarantee on such filesystems. For those, we're best off not trying to provide WCC information to the client at all, and to simply allow it to poll for that information as needed with a GETATTR RPC. This patch adds a new flags field to struct export_operations, and defines a new EXPORT_OP_NOWCC flag that filesystems can use to indicate that nfsd should not attempt to provide WCC info in NFSv3 replies. It also adds a blurb about the new flags field and flag to the exporting documentation. The server will also now skip collecting this information for NFSv2 as well, since that info is never used there anyway. Note that this patch does not add this flag to any filesystem export_operations structures. This was originally developed to allow reexporting nfs via nfsd. That code is not (and may never be) suitable for merging into mainline. Other filesystems may want to consider enabling this flag too. It's hard to tell however which ones have export operations to enable export via knfsd and which ones mostly rely on them for open-by-filehandle support, so I'm leaving that up to the individual maintainers to decide. I am cc'ing the relevant lists for those filesystems that I think may want to consider adding this though. Cc: HPDD-discuss@lists.01.org Cc: ceph-devel@vger.kernel.org Cc: cluster-devel@redhat.com Cc: fuse-devel@lists.sourceforge.net Cc: ocfs2-devel@oss.oracle.com Signed-off-by: Jeff Layton --- Documentation/filesystems/nfs/Exporting | 27 +++++++++++++++++++++++++++ fs/nfsd/nfs3xdr.c | 5 ++++- fs/nfsd/nfsfh.c | 14 ++++++++++++++ fs/nfsd/nfsfh.h | 5 ++++- include/linux/exportfs.h | 2 ++ 5 files changed, 51 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/nfs/Exporting b/Documentation/filesystems/nfs/Exporting index 520a4becb75c..fa636cde3907 100644 --- a/Documentation/filesystems/nfs/Exporting +++ b/Documentation/filesystems/nfs/Exporting @@ -138,6 +138,11 @@ struct which has the following members: to find potential names, and matches inode numbers to find the correct match. + flags + Some filesystems may need to be handled differently than others. The + export_operations struct also includes a flags field that allows the + filesystem to communicate such information to nfsd. See the Export + Operations Flags section below for more explanation. A filehandle fragment consists of an array of 1 or more 4byte words, together with a one byte "type". @@ -147,3 +152,25 @@ generated by encode_fh, in which case it will have been padded with nuls. Rather, the encode_fh routine should choose a "type" which indicates the decode_fh how much of the filehandle is valid, and how it should be interpreted. + +Export Operations Flags +----------------------- +In addition to the operation vector pointers, struct export_operations also +contains a "flags" field that allows the filesystem to communicate to nfsd +that it may want to do things differently when dealing with it. The +following flags are defined: + + EXPORT_OP_NOWCC + RFC 1813 recommends that servers always send weak cache consistency + (WCC) data to the client after each operation. The server should + atomically collect attributes about the inode, do an operation on it, + and then collect the attributes afterward. This allows the client to + skip issuing GETATTRs in some situations but means that the server + is calling vfs_getattr for almost all RPCs. On some filesystems + (particularly those that are clustered or networked) this is expensive + and atomicity is difficult to guarantee. This flag indicates to nfsd + that it should skip providing WCC attributes to the client in NFSv3 + replies when doing operations on this filesystem. Consider enabling + this on filesystems that have an expensive ->getattr inode operation, + or when atomicity between pre and post operation attribute collection + is impossible to guarantee. diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index 01dcd494f781..c30c8c604e2a 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -203,7 +203,7 @@ static __be32 * encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; - if (dentry && d_really_is_positive(dentry)) { + if (!fhp->fh_no_wcc && dentry && d_really_is_positive(dentry)) { __be32 err; struct kstat stat; @@ -256,6 +256,9 @@ void fill_post_wcc(struct svc_fh *fhp) { __be32 err; + if (fhp->fh_no_wcc) + return; + if (fhp->fh_post_saved) printk("nfsd: inode locked twice during operation.\n"); diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index 350041a40fe5..29ae37f62b9b 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -267,6 +267,16 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) fhp->fh_dentry = dentry; fhp->fh_export = exp; + + switch (rqstp->rq_vers) { + case 3: + if (!(dentry->d_sb->s_export_op->flags & EXPORT_OP_NOWCC)) + break; + /* Fallthrough */ + case 2: + fhp->fh_no_wcc = true; + } + return 0; out: exp_put(exp); @@ -535,6 +545,9 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, */ set_version_and_fsid_type(fhp, exp, ref_fh); + /* If we have a ref_fh, then copy the fh_no_wcc setting from it. */ + fhp->fh_no_wcc = ref_fh ? ref_fh->fh_no_wcc : false; + if (ref_fh == fhp) fh_put(ref_fh); @@ -641,6 +654,7 @@ fh_put(struct svc_fh *fhp) exp_put(exp); fhp->fh_export = NULL; } + fhp->fh_no_wcc = false; return; } diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h index 1e90dad4926b..9ddead4d98f8 100644 --- a/fs/nfsd/nfsfh.h +++ b/fs/nfsd/nfsfh.h @@ -32,6 +32,7 @@ typedef struct svc_fh { unsigned char fh_locked; /* inode locked by us */ unsigned char fh_want_write; /* remount protection taken */ + bool fh_no_wcc; /* no wcc data needed */ #ifdef CONFIG_NFSD_V3 unsigned char fh_post_saved; /* post-op attrs saved */ @@ -51,7 +52,6 @@ typedef struct svc_fh { struct kstat fh_post_attr; /* full attrs after operation */ u64 fh_post_change; /* nfsv4 change; see above */ #endif /* CONFIG_NFSD_V3 */ - } svc_fh; enum nfsd_fsid { @@ -225,6 +225,9 @@ fill_pre_wcc(struct svc_fh *fhp) { struct inode *inode; + if (fhp->fh_no_wcc) + return; + inode = d_inode(fhp->fh_dentry); if (!fhp->fh_pre_saved) { fhp->fh_pre_mtime = inode->i_mtime; diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index fa05e04c5531..600c3fccc999 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -214,6 +214,8 @@ struct export_operations { bool write, u32 *device_generation); int (*commit_blocks)(struct inode *inode, struct iomap *iomaps, int nr_iomaps, struct iattr *iattr); +#define EXPORT_OP_NOWCC (0x1) /* Don't collect wcc data for NFSv3 replies */ + unsigned long flags; }; extern int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,