linux-kernel - [PATCH 3/6] gfs2: simplify current_tail() via list_last_entry_or

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Date:	Fri, 15 Nov 2013 12:32:52 +0800
From:	Jeff Liu <jeff.liu@...cle.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, "xfs@....sgi.com" <xfs@....sgi.com>,
	cluster-devel@...hat.com, linux-mtd@...ts.infradead.org,
	jfs-discussion@...ts.sourceforge.net, oleg@...hat.com,
	jiri@...nulli.us, gregkh@...uxfoundation.org
Subject: [PATCH 3/6] gfs2: simplify current_tail() via list_last_entry_or_null()

From: Jie Liu <jeff.liu@...cle.com>

Simplify the code in current_tail() via list_last_entry_or_null().

Signed-off-by: Jie Liu <jeff.liu@...cle.com>
---
 fs/gfs2/log.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 610613f..555f767 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -441,13 +441,9 @@ static unsigned int current_tail(struct gfs2_sbd *sdp)
 
 	spin_lock(&sdp->sd_ail_lock);
 
-	if (list_empty(&sdp->sd_ail1_list)) {
-		tail = sdp->sd_log_head;
-	} else {
-		tr = list_entry(sdp->sd_ail1_list.prev, struct gfs2_trans,
-				tr_list);
-		tail = tr->tr_first;
-	}
+	tr = list_last_entry_or_null(&sdp->sd_ail1_list, struct gfs2_trans,
+				     tr_list);
+	tail = tr ? tr->tr_first : sdp->sd_log_head;
 
 	spin_unlock(&sdp->sd_ail_lock);
 
-- 
1.8.3.2
--
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