Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:64365 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932081Ab2IUUw1 (ORCPT ); Fri, 21 Sep 2012 16:52:27 -0400 From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v2 17/26] NFSv4.1: Free the pnfs_layout_hdr outside the inode->i_lock Date: Fri, 21 Sep 2012 16:50:12 -0400 Message-Id: <1348260621-10294-17-git-send-email-Trond.Myklebust@netapp.com> In-Reply-To: <1348260621-10294-16-git-send-email-Trond.Myklebust@netapp.com> References: <1348260621-10294-1-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-2-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-3-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-4-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-5-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-6-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-7-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-8-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-9-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-10-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-11-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-12-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-13-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-14-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-15-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-16-git-send-email-Trond.Myklebust@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 767c748..1827cae 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); } } @@ -762,8 +755,12 @@ 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) -- 1.7.11.4