From: Jeff Layton Subject: [PATCH v4 17/19] xfs: avoid setting XFS_ILOG_CORE if i_version doesn't need incrementing Date: Fri, 22 Dec 2017 07:05:54 -0500 Message-ID: <20171222120556.7435-18-jlayton@kernel.org> References: <20171222120556.7435-1-jlayton@kernel.org> Cc: linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, bfields@fieldses.org, neilb@suse.de, jack@suse.de, linux-ext4@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, linux-xfs@vger.kernel.org, darrick.wong@oracle.com, david@fromorbit.com, linux-btrfs@vger.kernel.org, clm@fb.com, jbacik@fb.com, dsterba@suse.com, linux-integrity@vger.kernel.org, zohar@linux.vnet.ibm.com, dmitry.kasatkin@gmail.com, linux-afs@lists.infradead.org, dhowells@redhat.com, jaltman@auristor.com To: linux-fsdevel@vger.kernel.org Return-path: In-Reply-To: <20171222120556.7435-1-jlayton@kernel.org> Sender: linux-btrfs-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Jeff Layton If XFS_ILOG_CORE is already set then go ahead and increment it. Signed-off-by: Jeff Layton --- fs/xfs/xfs_trans_inode.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c index 225544327c4f..4a89da4b6fe7 100644 --- a/fs/xfs/xfs_trans_inode.c +++ b/fs/xfs/xfs_trans_inode.c @@ -112,15 +112,17 @@ xfs_trans_log_inode( /* * First time we log the inode in a transaction, bump the inode change - * counter if it is configured for this to occur. We don't use - * inode_inc_version() because there is no need for extra locking around - * i_version as we already hold the inode locked exclusively for - * metadata modification. + * counter if it is configured for this to occur. While we have the + * inode locked exclusively for metadata modification, we can usually + * avoid setting XFS_ILOG_CORE if no one has queried the value since + * the last time it was incremented. If we have XFS_ILOG_CORE already + * set however, then go ahead and bump the i_version counter + * unconditionally. */ if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) && IS_I_VERSION(VFS_I(ip))) { - inode_inc_iversion(VFS_I(ip)); - flags |= XFS_ILOG_CORE; + if (inode_maybe_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE)) + flags |= XFS_ILOG_CORE; } tp->t_flags |= XFS_TRANS_DIRTY; -- 2.14.3