From: Tao Ma <tao.ma@oracle.com>
Date: Wed, 14 Jul 2010 03:19:32 +0000 (+0800)
Subject: ocfs2: Don't duplicate pages past i_size during CoW.
X-Git-Tag: v2.6.35-rc6~34^2~3
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=f5e27b6ddfbafdd9c9c2f06bbf28af12581409bc;p=~emulex%2Finfiniband.git

ocfs2: Don't duplicate pages past i_size during CoW.

During CoW, the pages after i_size don't contain valid data, so there's
no need to read and duplicate them.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
---

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 32949df1069..3ac5aa733e9 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -2931,6 +2931,12 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 
 	offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
 	end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
+	/*
+	 * We only duplicate pages until we reach the page contains i_size - 1.
+	 * So trim 'end' to i_size.
+	 */
+	if (end > i_size_read(context->inode))
+		end = i_size_read(context->inode);
 
 	while (offset < end) {
 		page_index = offset >> PAGE_CACHE_SHIFT;