linux-kernel - [PATCH 07/32] GFS2: Use filemap_fdatawrite() to write back the AIL

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Message-Id: <1305794847-3291-8-git-send-email-swhiteho@redhat.com>
Date:	Thu, 19 May 2011 09:47:02 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 07/32] GFS2: Use filemap_fdatawrite() to write back the AIL

In order to ensure that the mapping stats (and thus the bdi) are correctly
updated, this patch changes the AIL writeback to use the filemap_datawrite
function. This helps prevent stalls in balance_dirty_pages() due to
large amounts of dirty metadata when there is little or no dirty data
around.

Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 5b102c1..3ebafa1 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -91,6 +91,7 @@ static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 __releases(&sdp->sd_ail_lock)
 __acquires(&sdp->sd_ail_lock)
 {
+	struct gfs2_glock *gl = NULL;
 	struct gfs2_bufdata *bd, *s;
 	struct buffer_head *bh;
 	int retry;
@@ -113,19 +114,13 @@ __acquires(&sdp->sd_ail_lock)
 
 			if (!buffer_dirty(bh))
 				continue;
-
+			if (gl == bd->bd_gl)
+				continue;
+			gl = bd->bd_gl;
 			list_move(&bd->bd_ail_st_list, &ai->ai_ail1_list);
 
-			get_bh(bh);
 			spin_unlock(&sdp->sd_ail_lock);
-			lock_buffer(bh);
-			if (test_clear_buffer_dirty(bh)) {
-				bh->b_end_io = end_buffer_write_sync;
-				submit_bh(WRITE_SYNC, bh);
-			} else {
-				unlock_buffer(bh);
-				brelse(bh);
-			}
+			filemap_fdatawrite(gfs2_glock2aspace(gl));
 			spin_lock(&sdp->sd_ail_lock);
 
 			retry = 1;
-- 
1.7.4

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