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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
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+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;