From patchwork Thu Mar 6 13:19:06 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yan, Zheng" X-Patchwork-Id: 3783591 Return-Path: X-Original-To: patchwork-ceph-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 004639F370 for ; Thu, 6 Mar 2014 13:19:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 17C972024C for ; Thu, 6 Mar 2014 13:19:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1949E20225 for ; Thu, 6 Mar 2014 13:19:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750919AbaCFNTb (ORCPT ); Thu, 6 Mar 2014 08:19:31 -0500 Received: from mga14.intel.com ([143.182.124.37]:3512 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750760AbaCFNTa (ORCPT ); Thu, 6 Mar 2014 08:19:30 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by azsmga102.ch.intel.com with ESMTP; 06 Mar 2014 05:19:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,600,1389772800"; d="scan'208";a="487203690" Received: from unknown (HELO zyan5-mobl.ccr.corp.intel.com) ([10.255.21.212]) by fmsmga001.fm.intel.com with ESMTP; 06 Mar 2014 05:19:09 -0800 From: "Yan, Zheng" To: ceph-devel@vger.kernel.org Cc: "Yan, Zheng" Subject: [PATCH] ceph: add get_name() NFS export callback Date: Thu, 6 Mar 2014 21:19:06 +0800 Message-Id: <1394111946-13754-1-git-send-email-zheng.z.yan@intel.com> X-Mailer: git-send-email 1.8.5.3 Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: ceph-devel@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=unavailable 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 Set WANT_DENTRY flag for the LOOKUPINO MDS request. The flag makes MDS reply contain dentry trace. Signed-off-by: Yan, Zheng --- fs/ceph/export.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ fs/ceph/inode.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 95 insertions(+), 1 deletion(-) diff --git a/fs/ceph/export.c b/fs/ceph/export.c index 4ec1fd5..3c84b49 100644 --- a/fs/ceph/export.c +++ b/fs/ceph/export.c @@ -183,9 +183,54 @@ static struct dentry *ceph_get_parent(struct dentry *child) return dentry; } +static int ceph_get_name(struct dentry *parent, char *name, + struct dentry *child) +{ + struct ceph_mds_client *mdsc; + struct ceph_mds_request *req; + int err; + + mdsc = ceph_inode_to_client(child->d_inode)->mdsc; + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPINO, + USE_ANY_MDS); + if (IS_ERR(req)) + return PTR_ERR(req); + + mutex_lock(&parent->d_inode->i_mutex); + + req->r_inode = child->d_inode; + ihold(child->d_inode); + req->r_ino2 = ceph_vino(parent->d_inode); + req->r_locked_dir = parent->d_inode; + req->r_num_caps = 1; + err = ceph_mdsc_do_request(mdsc, NULL, req); + + mutex_unlock(&parent->d_inode->i_mutex); + + if (!err) { + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + if (rinfo->head->is_dentry) { + memcpy(name, rinfo->dname, rinfo->dname_len); + name[rinfo->dname_len] = 0; + } else { + err = -EOPNOTSUPP; + } + } + ceph_mdsc_put_request(req); + + if (!err) + dout("get_name child %p ino %llx.%llx name %s\n", + child, ceph_vinop(child->d_inode), name); + else + dout("get_name child %p ino %llx.%llx err %d\n", + child, ceph_vinop(child->d_inode), err); + return err; +} + const struct export_operations ceph_export_ops = { .encode_fh = ceph_encode_fh, .fh_to_dentry = ceph_fh_to_dentry, .fh_to_parent = ceph_fh_to_parent, .get_parent = ceph_get_parent, + .get_name = ceph_get_name, }; diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 8bf2384..ff3ee3e 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -1044,10 +1044,59 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, session, req->r_request_started, -1, &req->r_caps_reservation); if (err < 0) - return err; + goto done; } else { WARN_ON_ONCE(1); } + + if (dir && req->r_op == CEPH_MDS_OP_LOOKUPINO) { + struct qstr dname; + struct dentry *dn, *parent; + + BUG_ON(!rinfo->head->is_target); + BUG_ON(req->r_dentry); + + parent = d_find_any_alias(dir); + BUG_ON(!parent); + + dname.name = rinfo->dname; + dname.len = rinfo->dname_len; + dname.hash = full_name_hash(dname.name, dname.len); + vino.ino = le64_to_cpu(rinfo->targeti.in->ino); + vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); +retry_lookup: + dn = d_lookup(parent, &dname); + dout("d_lookup on parent=%p name=%.*s got %p\n", + parent, dname.len, dname.name, dn); + + if (!dn) { + dn = d_alloc(parent, &dname); + dout("d_alloc %p '%.*s' = %p\n", parent, + dname.len, dname.name, dn); + if (dn == NULL) { + dput(parent); + err = -ENOMEM; + goto done; + } + err = ceph_init_dentry(dn); + if (err < 0) { + dput(dn); + dput(parent); + goto done; + } + } else if (dn->d_inode && + (ceph_ino(dn->d_inode) != vino.ino || + ceph_snap(dn->d_inode) != vino.snap)) { + dout(" dn %p points to wrong inode %p\n", + dn, dn->d_inode); + d_delete(dn); + dput(dn); + goto retry_lookup; + } + + req->r_dentry = dn; + dput(parent); + } } if (rinfo->head->is_target) {