linux-kernel - [RFC PATCH v1 27/30] xfs: avoid setting XFS_ILOG_CORE if i

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Date:   Wed, 21 Dec 2016 12:03:44 -0500
From:   Jeff Layton <jlayton@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: [RFC PATCH v1 27/30] xfs: avoid setting XFS_ILOG_CORE if i_version doesn't need incrementing

We do go ahead and increment it though if XFS_ILOG_CORE is already
set when we get to this point.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/xfs/xfs_trans_inode.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c
index 844c08886170..fac422da0bbe 100644
--- a/fs/xfs/xfs_trans_inode.c
+++ b/fs/xfs/xfs_trans_inode.c
@@ -110,15 +110,15 @@ 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 hold the
+	 * inode locked exclusively for metadata modification, we still use
+	 * inode_inc_iversion as it allows us to avoid setting XFS_ILOG_CORE
+	 * if the version hasn't been queried since the last bump.
 	 */
 	if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
 	    IS_I_VERSION(VFS_I(ip))) {
-		inode_inc_iversion_locked(VFS_I(ip));
-		flags |= XFS_ILOG_CORE;
+		if (inode_inc_iversion(VFS_I(ip), flags & XFS_ILOG_CORE))
+			flags |= XFS_ILOG_CORE;
 	}
 
 	tp->t_flags |= XFS_TRANS_DIRTY;
-- 
2.7.4