From f168f59fd385b59a39c917c4796cff48a2597c6f Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Fri, 11 Jul 2008 19:27:31 -0400
Subject: [PATCH] --- yaml --- r: 101105 b: refs/heads/master c:
 c7d206b3379f7d6462e778b74f475c470ee3dcaf h: refs/heads/master i:   101103:
 2f678b51aafdb59250f08eb495440ad4df98da9d v: v3

---
 [refs]            |  2 +-
 trunk/fs/buffer.c | 12 +++++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index b6c12f1de959..bd507c2331a3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2e9ee850355593e311d9a26542290fe51e152f74
+refs/heads/master: c7d206b3379f7d6462e778b74f475c470ee3dcaf
diff --git a/trunk/fs/buffer.c b/trunk/fs/buffer.c
index 0f51c0f7c266..f4b033237a02 100644
--- a/trunk/fs/buffer.c
+++ b/trunk/fs/buffer.c
@@ -2061,6 +2061,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 			struct page *page, void *fsdata)
 {
 	struct inode *inode = mapping->host;
+	int i_size_changed = 0;
 
 	copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
 
@@ -2073,12 +2074,21 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 	 */
 	if (pos+copied > inode->i_size) {
 		i_size_write(inode, pos+copied);
-		mark_inode_dirty(inode);
+		i_size_changed = 1;
 	}
 
 	unlock_page(page);
 	page_cache_release(page);
 
+	/*
+	 * Don't mark the inode dirty under page lock. First, it unnecessarily
+	 * makes the holding time of page lock longer. Second, it forces lock
+	 * ordering of page lock and transaction start for journaling
+	 * filesystems.
+	 */
+	if (i_size_changed)
+		mark_inode_dirty(inode);
+
 	return copied;
 }
 EXPORT_SYMBOL(generic_write_end);