xfs: don't warn about page discards on shutdown

If we are doing a forced shutdown, we can get lots of noise about
delalloc pages being discarded. This is happens by design during a
forced shutdown, so don't spam the logs with these messages.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

fs/xfs/linux-2.6/xfs_aops.c

@@ -932,6 +932,9 @@ xfs_aops_discard_page(
 	if (!xfs_is_delayed_page(page, IOMAP_DELAY))
 		goto out_invalidate;
 
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		goto out_invalidate;
+
 	xfs_fs_cmn_err(CE_ALERT, ip->i_mount,
 		"page discard on page %p, inode 0x%llx, offset %llu.",
 			page, ip->i_ino, offset);
@@ -964,8 +967,10 @@ xfs_aops_discard_page(
 
 		if (error) {
 			/* something screwed, just bail */
+			if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 				xfs_fs_cmn_err(CE_ALERT, ip->i_mount,
 				"page discard failed delalloc mapping lookup.");
+			}
 			break;
 		}
 		if (!nimaps) {
@@ -991,8 +996,10 @@ xfs_aops_discard_page(
 		ASSERT(!flist.xbf_count && !flist.xbf_first);
 		if (error) {
 			/* something screwed, just bail */
+			if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 				xfs_fs_cmn_err(CE_ALERT, ip->i_mount,
 			"page discard unable to remove delalloc mapping.");
+			}
 			break;
 		}
 next_buffer: