From: Jens Axboe <jaxboe@fusionio.com>
Date: Thu, 17 Mar 2011 09:51:40 +0000 (+0100)
Subject: fs: make fsync_buffers_list() plug
X-Git-Tag: firefly_0821_release~7613^2~1808^2~14
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4ee2491ed8569f370bf4c1a4c046a6efb8032bd2;p=firefly-linux-kernel-4.4.55.git

fs: make fsync_buffers_list() plug

It used WRITE_SYNC_PLUG before and potentially submits a batch
of IO, so lets enable plugging for this case.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/fs/buffer.c b/fs/buffer.c
index 42534f67d71b..2e6b1a387b7e 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -743,8 +743,10 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
 	struct list_head tmp;
 	struct address_space *mapping;
 	int err = 0, err2;
+	struct blk_plug plug;
 
 	INIT_LIST_HEAD(&tmp);
+	blk_start_plug(&plug);
 
 	spin_lock(lock);
 	while (!list_empty(list)) {
@@ -781,6 +783,10 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
 		}
 	}
 
+	spin_unlock(lock);
+	blk_finish_plug(&plug);
+	spin_lock(lock);
+
 	while (!list_empty(&tmp)) {
 		bh = BH_ENTRY(tmp.prev);
 		get_bh(bh);