From patchwork Mon Sep 24 19:56:36 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Trond Myklebust X-Patchwork-Id: 1499691 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id ED7233FE80 for ; Mon, 24 Sep 2012 19:59:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932092Ab2IXT7D (ORCPT ); Mon, 24 Sep 2012 15:59:03 -0400 Received: from mx2.netapp.com ([216.240.18.37]:46480 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932072Ab2IXT7B (ORCPT ); Mon, 24 Sep 2012 15:59:01 -0400 X-IronPort-AV: E=Sophos;i="4.80,477,1344236400"; d="scan'208";a="693537272" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 24 Sep 2012 12:59:01 -0700 Received: from lade.trondhjem.org.com ([10.63.230.114]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id q8OJv9Ta023988; Mon, 24 Sep 2012 12:58:57 -0700 (PDT) From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v3 18/28] NFSv4.1: Free the pnfs_layout_hdr outside the inode->i_lock Date: Mon, 24 Sep 2012 15:56:36 -0400 Message-Id: <1348516606-22721-18-git-send-email-Trond.Myklebust@netapp.com> X-Mailer: git-send-email 1.7.11.4 In-Reply-To: <1348516606-22721-17-git-send-email-Trond.Myklebust@netapp.com> References: <1348516606-22721-1-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-2-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-3-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-4-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-5-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-6-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-7-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-8-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-9-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-10-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-11-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-12-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-13-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-14-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-15-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-16-git-send-email-Trond.Myklebust@netapp.com> <1348516606-22721-17-git-send-email-Trond.Myklebust@netapp.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org None of the existing pNFS layout drivers seem to require the inode to be locked while they free the layout header. Signed-off-by: Trond Myklebust --- fs/nfs/pnfs.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index d4b55bf..c16c805 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -213,7 +213,7 @@ pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) } static void -destroy_layout_hdr(struct pnfs_layout_hdr *lo) +pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) { struct nfs_inode *nfsi = NFS_I(lo->plh_inode); dprintk("%s: freeing layout cache %p\n", __func__, lo); @@ -222,14 +222,6 @@ destroy_layout_hdr(struct pnfs_layout_hdr *lo) /* Reset MDS Threshold I/O counters */ nfsi->write_io = 0; nfsi->read_io = 0; - pnfs_free_layout_hdr(lo); -} - -static void -pnfs_put_layout_hdr_locked(struct pnfs_layout_hdr *lo) -{ - if (atomic_dec_and_test(&lo->plh_refcount)) - destroy_layout_hdr(lo); } void @@ -238,8 +230,9 @@ pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) struct inode *inode = lo->plh_inode; if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { - destroy_layout_hdr(lo); + pnfs_detach_layout_hdr(lo); spin_unlock(&inode->i_lock); + pnfs_free_layout_hdr(lo); } } @@ -792,8 +785,12 @@ void pnfs_roc_release(struct inode *ino) spin_lock(&ino->i_lock); lo = NFS_I(ino)->layout; lo->plh_block_lgets--; - pnfs_put_layout_hdr_locked(lo); - spin_unlock(&ino->i_lock); + if (atomic_dec_and_test(&lo->plh_refcount)) { + pnfs_detach_layout_hdr(lo); + spin_unlock(&ino->i_lock); + pnfs_free_layout_hdr(lo); + } else + spin_unlock(&ino->i_lock); } void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)