From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751180AbWHIQ7S (ORCPT ); Wed, 9 Aug 2006 12:59:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751027AbWHIQ7S (ORCPT ); Wed, 9 Aug 2006 12:59:18 -0400 Received: from e35.co.us.ibm.com ([32.97.110.153]:59022 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S1750878AbWHIQ5g (ORCPT ); Wed, 9 Aug 2006 12:57:36 -0400 Subject: [PATCH 5/6] clean up OCFS2 nlink handling To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, Dave Hansen From: Dave Hansen Date: Wed, 09 Aug 2006 09:57:33 -0700 References: <20060809165729.FE36B262@localhost.localdomain> In-Reply-To: <20060809165729.FE36B262@localhost.localdomain> Message-Id: <20060809165733.704AD0F5@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org OCFS2 does some operations on i_nlink, then reverts them if some of its operations fail to complete. This does not fit in well with the drop_nlink() logic where we expect i_nlink to stay at zero once it gets there. So, delay all of the nlink operations until we're sure that the operations have completed. Also, introduce a small helper to check whether an inode has proper "unlinkable" i_nlink counts no matter whether it is a directory or regular inode. This patch is broken out from the others because it does contain some logical changes. Signed-off-by: Dave Hansen Signed-off-by: Mark Fasheh --- arch/i386/kernel/setup.c | 0 lxc-dave/fs/ocfs2/namei.c | 45 ++++++++++++++++++++++++--------------------- 2 files changed, 24 insertions(+), 21 deletions(-) diff -puN fs/ocfs2/namei.c~B5-clean_up_OCFS2_nlink_handling fs/ocfs2/namei.c --- lxc/fs/ocfs2/namei.c~B5-clean_up_OCFS2_nlink_handling 2006-08-08 09:18:54.000000000 -0700 +++ lxc-dave/fs/ocfs2/namei.c 2006-08-08 09:18:56.000000000 -0700 @@ -744,11 +744,23 @@ bail: return err; } +static inline int inode_is_unlinkable(struct inode *inode) +{ + if (S_ISDIR(inode->i_mode)) { + if (inode->i_nlink == 2) + return 1; + return 0; + } + + if (inode->i_nlink == 1) + return 1; + return 0; +} + static int ocfs2_unlink(struct inode *dir, struct dentry *dentry) { int status; - unsigned int saved_nlink = 0; struct inode *inode = dentry->d_inode; struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); u64 blkno; @@ -760,6 +772,7 @@ static int ocfs2_unlink(struct inode *di struct buffer_head *dirent_bh = NULL; char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; struct buffer_head *orphan_entry_bh = NULL; + unsigned int future_nlink; mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, dentry->d_name.len, dentry->d_name.name); @@ -823,18 +836,11 @@ static int ocfs2_unlink(struct inode *di } } - /* There are still a few steps left until we can consider the - * unlink to have succeeded. Save off nlink here before - * modification so we can set it back in case we hit an issue - * before commit. */ - saved_nlink = inode->i_nlink; - if (S_ISDIR(inode->i_mode)) - inode->i_nlink = 0; + if (S_ISDIR(inode->i_mode) && (inode->i_nlink == 2)) + future_nlink = 0; else - inode->i_nlink--; - - status = ocfs2_request_unlink_vote(inode, dentry, - (unsigned int) inode->i_nlink); + future_nlink = inode->i_nlink - 1; + status = ocfs2_request_unlink_vote(inode, dentry, future_nlink); if (status < 0) { /* This vote should succeed under all normal * circumstances. */ @@ -842,7 +848,7 @@ static int ocfs2_unlink(struct inode *di goto leave; } - if (!inode->i_nlink) { + if (inode_is_unlinkable(inode)) { status = ocfs2_prepare_orphan_dir(osb, handle, inode, orphan_name, &orphan_entry_bh); @@ -869,7 +875,7 @@ static int ocfs2_unlink(struct inode *di fe = (struct ocfs2_dinode *) fe_bh->b_data; - if (!inode->i_nlink) { + if (inode_is_unlinkable(inode)) { status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name, orphan_entry_bh); if (status < 0) { @@ -885,10 +891,10 @@ static int ocfs2_unlink(struct inode *di goto leave; } - /* We can set nlink on the dinode now. clear the saved version - * so that it doesn't get set later. */ + if (S_ISDIR(inode->i_mode)) + drop_nlink(inode); + drop_nlink(inode); fe->i_links_count = cpu_to_le16(inode->i_nlink); - saved_nlink = 0; status = ocfs2_journal_dirty(handle, fe_bh); if (status < 0) { @@ -897,7 +903,7 @@ static int ocfs2_unlink(struct inode *di } if (S_ISDIR(inode->i_mode)) { - dir->i_nlink--; + drop_nlink(dir); status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh); if (status < 0) { @@ -907,9 +913,6 @@ static int ocfs2_unlink(struct inode *di } leave: - if (status < 0 && saved_nlink) - inode->i_nlink = saved_nlink; - if (handle) ocfs2_commit_trans(handle); diff -puN arch/i386/kernel/setup.c~B5-clean_up_OCFS2_nlink_handling arch/i386/kernel/setup.c _