iomap: Fix iomap_invalidatepage tracepoint

This tracepoint is defined to take an offset in the file, not an
offset in the folio.

Fixes: 1ac99452 ("iomap: Remove pgoff from tracepoints")
Signed-off-by: NMatthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs

fs/iomap/buffered-io.c

@@ -480,7 +480,8 @@ EXPORT_SYMBOL_GPL(iomap_releasepage);
 
 void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len)
 {
-	trace_iomap_invalidatepage(folio->mapping->host, offset, len);
+	trace_iomap_invalidatepage(folio->mapping->host,
+					folio_pos(folio) + offset, len);
 
 	/*
 	 * If we're invalidating the entire folio, clear the dirty state