diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index b25d11a..bd5e1cf 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1125,6 +1125,16 @@
 			continue;
 		}
 
+		/*
+		 * A hole may still be marked uptodate because discard_buffer
+		 * leaves the flag set.
+		 */
+		if (!buffer_mapped(bh) && buffer_uptodate(bh)) {
+			ASSERT(!buffer_dirty(bh));
+			imap_valid = 0;
+			continue;
+		}
+
 		if (imap_valid)
 			imap_valid = xfs_imap_valid(inode, &imap, offset);