From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751660AbcFTCO3 (ORCPT ); Sun, 19 Jun 2016 22:14:29 -0400 Received: from linuxhacker.ru ([217.76.32.60]:56162 "EHLO fiona.linuxhacker.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752086AbcFTCJa (ORCPT ); Sun, 19 Jun 2016 22:09:30 -0400 From: Oleg Drokin To: Greg Kroah-Hartman , devel@driverdev.osuosl.org, Andreas Dilger Cc: Linux Kernel Mailing List , Lustre Development List , Oleg Drokin , Oleg Drokin Subject: [PATCH 23/28] staging/lustre/llite: Restore proper opencache operations Date: Sun, 19 Jun 2016 22:07:38 -0400 Message-Id: <1466388463-1817551-24-git-send-email-green@linuxhacker.ru> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1466388463-1817551-1-git-send-email-green@linuxhacker.ru> References: <1466388463-1817551-1-git-send-email-green@linuxhacker.ru> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oleg Drokin Mark dentries that came to us via NFS in a special way so that we can tell them apart during open and activate open cache (we really don't want to do open/close RPC for every NFS IO). This became needed since dentry revlidate no longer reimplements any RPCs for lookup, and as such if a dentry is valid, ll_revalidate_dentry returns 1 and ll_lookup_it() is never visited during opens, we get straght into ll_file_open() without a valid intent/RPC. This used to be only true for NFS, so opencache was engaged needlessly, and it carries a cost of it's own if there is in fact no repetitive file opening-closing going on Signed-off-by: Oleg Drokin Reviewed-on: http://review.whamcloud.com/20354 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8019 Reviewed-by: Andreas Dilger Reviewed-by: Li Xi Signed-off-by: Oleg Drokin --- drivers/staging/lustre/lustre/llite/file.c | 14 +++++++++++++- drivers/staging/lustre/lustre/llite/llite_internal.h | 1 + drivers/staging/lustre/lustre/llite/llite_nfs.c | 18 ++++++++++++++++++ 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c index a188366..6a5e8c7 100644 --- a/drivers/staging/lustre/lustre/llite/file.c +++ b/drivers/staging/lustre/lustre/llite/file.c @@ -411,7 +411,19 @@ static int ll_intent_file_open(struct dentry *dentry, void *lmm, * parameters. No need for the open lock */ if (!lmm && lmmsize == 0) { - itp->it_flags |= MDS_OPEN_LOCK; + struct ll_dentry_data *ldd = ll_d2d(dentry); + /* + * If we came via ll_iget_for_nfs, then we need to request + * struct ll_dentry_data *ldd = ll_d2d(file->f_dentry); + * + * NB: when ldd is NULL, it must have come via normal + * lookup path only, since ll_iget_for_nfs always calls + * ll_d_init(). + */ + if (ldd && ldd->lld_nfs_dentry) { + ldd->lld_nfs_dentry = 0; + itp->it_flags |= MDS_OPEN_LOCK; + } if (itp->it_flags & FMODE_WRITE) opc = LUSTRE_OPC_CREATE; } diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h index 3692102..1d4e91e 100644 --- a/drivers/staging/lustre/lustre/llite/llite_internal.h +++ b/drivers/staging/lustre/lustre/llite/llite_internal.h @@ -64,6 +64,7 @@ struct ll_dentry_data { struct lookup_intent *lld_it; unsigned int lld_sa_generation; unsigned int lld_invalid:1; + unsigned int lld_nfs_dentry:1; struct rcu_head lld_rcu_head; }; diff --git a/drivers/staging/lustre/lustre/llite/llite_nfs.c b/drivers/staging/lustre/lustre/llite/llite_nfs.c index d7878e5..65972c8 100644 --- a/drivers/staging/lustre/lustre/llite/llite_nfs.c +++ b/drivers/staging/lustre/lustre/llite/llite_nfs.c @@ -168,6 +168,24 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren /* N.B. d_obtain_alias() drops inode ref on error */ result = d_obtain_alias(inode); + if (!IS_ERR(result)) { + int rc; + + rc = ll_d_init(result); + if (rc < 0) { + dput(result); + result = ERR_PTR(rc); + } else { + struct ll_dentry_data *ldd = ll_d2d(result); + + /* + * Need to signal to the ll_intent_file_open that + * we came from NFS and so opencache needs to be + * enabled for this one + */ + ldd->lld_nfs_dentry = 1; + } + } return result; } -- 2.7.4