Commit f5e27b6d authored by Tao Ma's avatar Tao Ma Committed by Joel Becker
Browse files

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: default avatarTao Ma <tao.ma@oracle.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
parent e372357b

fs/ocfs2/refcounttree.c

+6 −0
Original line number Diff line number Diff line
@@ -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;