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 <[email protected]> Signed-off-by: Joel Becker <[email protected]>
berg · Jul 15, 2010 · f5e27b6 · f5e27b6
1 parent e372357
commit f5e27b6
Showing 1 changed file with 6 additions and 0 deletions.
diff --git 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;